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general description the max4397 dual scart switch matrix routes audio and video signals between an mpeg encoder and two external scart connectors under i 2 c* control, and meets the requirements of en50049-1, iec 933-1, canal+, and bskyb standards. the video and audio channels feature input source selection multiplexers, input buffers, and output buffers for routing all inputs to selected outputs. the MAX4397D audio encoder input is differential dc-coupled, while the max4397s audio encoder input is single-ended ac- coupled. except for the MAX4397D? audio encoder input, all other inputs and outputs are ac-coupled with internal dc-biasing set to predefined levels. the max4397 provides programmable gain control from +5db to +7db in 1db steps for red, green, and blue component video signals. all other video outputs have a fixed +6db gain. additional features include an internal luma and chroma (y/c) mixer that generates a composite video signal (cvbs) to supply an rf modulator output, and internal video reconstruction low- pass filters with a cutoff frequency of 6mhz. the max4397 tv audio channel features clickless switching and programmable volume control from -56db to +6db in 2db steps. the vcr audio output also has programmable gain for -6db, 0db, or +6db. the device also generates monaural audio from left and right stereo inputs. all audio drivers deliver a 3.0v rms minimum output. the max4397 operates with standard 5v and 12v power supplies and supports slow-switching and fast- switching signals. the i 2 c interface programs the gain and volume control, and selects the input source for routing. the max4397 is available in a compact 48-pin thin qfn package and is specified over the 0? to +70? commercial temperature range. applications satellite set-top boxes cable set-top boxes tvs vcrs dvds features ? video outputs drive 2v p-p into 150 ? ? audio outputs drive 3v rms into 10k ? ? clickless, popless audio gain control and switching ? ac-coupled video inputs with internal clamp and bias ? dc-coupled video outputs ? composite video signal created internally from y/c inputs ? internal video reconstruction filters provide -35db at 27mhz ? differential (MAX4397D) or single-ended (max4397s) audio encoder input ? red/chroma switch for bidirectional i/o ? i 2 c-programmable rgb gain from +5db to +7db ? i 2 c-programmable audio gain control from +6db to -56db ? meets en50049-1, iec 933-1, canal+, and bskyb requirements max4397 audio/video switch for dual scart connectors ________________________________________________________________ maxim integrated products 1 ordering information 19-3618; rev 0; 4/05 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. pin configuration and typical application circuits appear at end of data sheet. system block diagram appears at end of data sheet. evaluation kit available * purchase of i 2 c components from maxim integrated products, inc. or one of its sublicensed associated companies, conveys a license under the philips i 2 c patent rights to use these com- ponents in an i 2 c system, provided that the system conforms to the i 2 c standard specification as defined by philips. part temp range pin-package MAX4397Dctm 0? to +70? 48 thin qfn-ep* (7mm x 7mm) max4397sctm 0? to +70? 48 thin qfn-ep* (7mm x 7mm) * ep = exposed paddle.
max4397 audio/video switch for dual scart connectors 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v 12 = 12v, v vid = v aud = 5v, 0.1? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v aud to gndaud, v 12 to gndaud, and v vid to gndvid , set = 100k ? nominal, r load = 150 ? , t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v vid to gndvid........................................................-0.3v to +6v v 12 to gndaud .....................................................-0.3v to +14v v aud to gndaud ....................................................-0.3v to +6v gndaud to gndvid ............................................-0.1v to +0.1v all video inputs, encin_fs, vcrin_fs, set to gndvid......................................-0.3v to (v vid + 0.3v) all audio inputs, audbias to gndaud .........................-0.3v to (v aud + 0.3v) sda, scl, dev_addr to gndvid ..........................-0.3v to +6v all audio outputs, tv_ss, vcr_ss to gndaud...............................-0.3v to (v 12 + 0.3v) all video outputs, tvout_fs to v vid , v aud , gndaud, gndvid ................................................continuous all audio outputs to v vid , v aud , v 12 , gndvid, gndaud ................................................continuous continuous power dissipation (t a = +70?) 48-pin thin qfn (derate 27mw/? above +70?) .....2105.3mw operating temperature range...............................0? to +70? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units v vid supply voltage range v vid inferred from video gain test at 4.75v and 5.2v 4.75 5.0 5.25 v v aud supply voltage range v aud inferred from audio gain test at 4.75v and 5.2v 4.75 5.0 5.25 v v 12 supply voltage range v 12 inferred from slow switching levels 11.4 12.0 12.6 v v vid quiescent supply current i vid_q all video output amplifiers are enabled, no load 69 100 ma v vid standby supply current i vid_s all video output amplifiers are in shutdown, and tv_fs_out driver is in shutdown, no load 40 60 ma v aud quiescent supply current i aud_q no load 2.4 6 ma v 12 quiescent supply current i 12_q no load 3.6 6 ma video characteristics cvbs and y-c, 1v p-p input +5.5 +6.0 +6.5 +4.5 +5.0 +5.5 +5.5 +6.0 +6.5 voltage gain g_v r,g,b, 1v p-p input, (programmable gain control) +6.5 +7.0 +7.5 db lp filter attenuation attn t a = +25?, f = 6mhz, v in = 1v p-p 1.2 3.3 db lp filter suppression sppr t a = +25?, f = 27mhz, v in = 1v p-p 35 50 db slew rate sr v out = 2v p-p 8 v/? settling time t s v out = 2v p-p , settle to 0.1% (note 2) 380 ns gain matching ag 1v p-p input, between rgb or y-c -0.5 +0.5 db differential gain dg 5-step modulated staircase 0.4 % differential phase dp 5-step modulated staircase 0.2 degrees signal-to-rms noise snr_v v in = 1v p-p 65 db
max4397 audio/video switch for dual scart connectors _______________________________________________________________________________________ 3 electrical characteristics (continued) (v 12 = 12v, v vid = v aud = 5v, 0.1? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v aud to gndaud, v 12 to gndaud, and v vid to gndvid , set = 100k ? nominal, r load = 150 ? , t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units group delay variation ? gd f = 0.1mhz to 4.43mhz 14 ns sync-tip clamp level v_clmp rgb, composite, and luma input, no signal, no load 1.21 v chroma bias v_bias chroma input only, no signal, no load 1.9 v droop d set by input current -2 +2 % power-supply rejection ratio psrr_v dc, 0.5v p-p 48 db cvbs, y, or rgb video inputs, v in > v_ clmp 4m ? input impedance z in chroma video input, v in = v_ bias 11 k ? input clamp current i clmp v in = 1.75v 2.5 5 8.0 ? pulldown resistance rp enable vcr_r/c_out and tv_r/c_out pulldown through i 2 c, (see registers 7 and 9 for loading register details) 10 ? rgb, composite, and luma, no signal, no load 1.08 output pin bias voltage v out chroma, no signal, no load 2.27 v crosstalk xtlk between any two active inputs, f = 4.43mhz, v in = 1v p-p -50 db mute suppression m_spr_v f = 4.43mhz, v in = 1v p-p , on one input only -50 db audio characteristics (note 3) tv or vcr to stereo, gain = 0db, v in = 1v p-p -0.5 0 +0.5 tv or vcr to mono, gain = 0db, v in = 1v p-p 2.5 3 3.5 enc to stereo, gain = 0db, v in = 1v p-p 3.02 3.52 4.02 voltage gain (from application input) g_a enc to mono, gain = 0db, v in = 1v p-p 6.02 6.52 7.02 db gain matching between channels ? g_a gain = 0db, v in = 1v p-p -0.5 0 +0.5 db flatness ? a f = 20hz to 20khz, 0.5v rms input, gain = 0db 0.01 db frequency bandwidth bw 0.5v rms input, frequency where output is -3db referenced to 1khz 230 khz input dc level (excluding encoder inputs that are high impedance) v in gain = 0db 0.2308 x v 12 v encoder input common-mode voltage range v cm MAX4397D only, input differential signal = 0v 1.2 v aud - 0.7 v
max4397 audio/video switch for dual scart connectors 4 _______________________________________________________________________________________ electrical characteristics (continued) (v 12 = 12v, v vid = v aud = 5v, 0.1? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v aud to gndaud, v 12 to gndaud, and v vid to gndvid , set = 100k ? nominal, r load = 150 ? , t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units encoder common-mode rejection ratio cmrr MAX4397D only, over v cm range 40 db single-ended inputs, f = 1khz, thd < 1% 3 enc inputs differential level, MAX4397D, f = 1khz, thd < 1% 2.08 input signal amplitude v in_ac enc inputs single-ended, max4397s, f = 1khz, thd < 1% 1.31 v rms single ended: vcr_inr, vcr_inl, tv_inr, tv_inl 0.1 encoder, MAX4397D: enc_inl+, enc_inl-, enc_inr+, enc_inr- 1 input resistance (measured at parts input) r in encoder, max4397s: enc _ inl, enc_inr 0.1 m ? output dc level v out_dc v in = 0v 0.5 x v 12 v signal-to-noise ratio snr_a f = 1.0khz, 1v rms application input, gain = 0db, 20hz to 20khz 95 db r load = 10k ? , f = 1.0khz, 0.5v rms output 0.004 total harmonic distortion plus noise thd+n r load = 10k ? , f = 1.0khz, 2v rms output 0.004 % output impedance zo f = 1khz 1 ? 1.414v p-p input, programmable gain to tv scart volume control range extends from -56db to +6db 1.5 2 2.5 volume attenuation step astep 1.414v p-p input, programmable gain to vcr audio extends from -6db to +6db 5.5 6 6.5 db from v 12, f = 1khz, 0.5v p-p , (c aud_bias = 47?), gain = 0db 75 power-supply rejection ratio psrr_a from v aud , f = 1khz, 0.5v p-p, v aud +4.75v, v aud +5.25v, gain = 0db 75 db mute suppression m_spr_a f = 1khz, 0.5v rms input, set through i 2 c, see register 1 for loading register details 90 db audio clipping level vclip f = 1khz, 2.5v rms input, gain = 6db, thd < 1% 3.6 v rms left-to-right crosstalk xtlk_lr f = 1khz, 0.5v rms input, gain = 0db 80 db crosstalk xtlk_cc tv scart to vcr scart or vcr scart to tv scart, f = 1khz, 0.5v rms input, gain = 0db 90 db
max4397 audio/video switch for dual scart connectors _______________________________________________________________________________________ 5 electrical characteristics (continued) (v 12 = 12v, v vid = v aud = 5v, 0.1? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v aud to gndaud, v 12 to gndaud, and v vid to gndvid , set = 100k ? nominal, r load = 150 ? , t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units digital interface: sda and scl (note 5) low-level input voltage v il 0 0.8 v high-level input voltage v ih 2.6 v hysteresis of schmitt trigger input 0.2 v i sink = 3ma 0.4 sda low-level output voltage v ol i sink = 6ma 0.6 v output fall time for sda line 400pf bus load 250 ns spike suppression 50 ns input current -10 +10 ? input capacitance 5pf scl clock frequency 0 400 khz hold time t hd , sta 0.6 ? low period of scl clock t low 1.3 ? high period of scl clock t high 0.6 ? setup time for a repeated start condition t su , sta 0.6 ? data hold time t hd , dat 0 0.9 ? data setup time t su , dat 100 ns setup time for stop condition t su , sto 0.6 ? bus free time between a stop and start t buf 1.3 ? other digital pins (note 5) dev_addr low level 0.8 v dev_addr high level 2.6 v slow switching section (note 5) input low level 02v input medium level 4.5 7.0 v input high level 9.5 v 12 v input current 50 100 ? output low level 10k ? to ground, internal tv, 11.4v < v 12 < 12.6v 0 1.5 v output medium level 10k ? to ground, external 16/9, 11.4v < v 12 < 12.6v 5.0 6.5 v output high level 10k ? to ground, external 4/3, 11.4v < v 12 < 12.6v 10 v 12 v
r/g/b video large-signal bandwidth vs. frequency max4397 toc01 frequency (mhz) gain (db) 1 -5 -4 -3 -2 -1 0 1 2 3 4 -6 0.1 10 v in = 1v p-p r l = 150 ? to gndvid group delay vs. frequency max4397 toc02 frequency (mhz) group delay (ns) 1 20 40 60 80 100 120 0 0.1 10 y video large-signal bandwidth vs. frequency max4397 toc03 frequency (mhz) gain (db) 1 -5 -4 -3 -2 -1 0 1 2 3 4 -6 0.1 10 v in = 1v p-p r l = 150 ? to gndvid t ypical operating characteristics (v 12 = 12v, v vid = v aud = 5v, 0.1? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v aud to gndaud, v 12 to gndaud, v vid to gndvid no load, t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.) max4397 audio/video switch for dual scart connectors 6 _______________________________________________________________________________________ electrical characteristics (continued) (v 12 = 12v, v vid = v aud = 5v, 0.1? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v aud to gndaud, v 12 to gndaud, and v vid to gndvid , set = 100k ? nominal, r load = 150 ? , t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max unit fast switching section (note 5) input low level 0 0.4 v input high level 13v input current 110a output low level i sink = 0.5ma 0 0.01 0.2 v output high level i source = 20ma, v vid - v oh 0.75 2v fast switching output to rgb skew (note 4) 30 ns fast switching output rise time 150 ? to ground 30 ns fast switching output fall time 150 ? to ground 30 ns note 1: all devices are 100% tested at t a = +25?. all temperature limits are guaranteed by design. note 2: the settling time is measured from the 50% of the input swing to the 0.1% of the final value of the output. note 3: maximum load capacitance is 200pf. all the listed parameters are measured at application? inputs, unless otherwise noted. see the typical application circuits . note 4: difference in propagation delays of fast-blanking signal and rgb signals. measured from 50% input transition to 50% output transition. signal levels to be determined. note 5: guaranteed by design.
max4397 audio/video switch for dual scart connectors _______________________________________________________________________________________ 7 audio crosstalk vs. frequency max4397 toc08 frequency (khz) crosstalk (db) 10 0.1 -100 -80 -60 -40 -20 0 -120 0.01 100 v in = 0.5v rms r l = 10k ? to gndaud 1 audio large-signal bandwidth vs. frequency max4397 toc07 frequency (khz) gain (db) 100 10 4 1 1000 3 2 1 0 -1 -2 -3 -4 -5 -6 v in = 0.5v rms r l = 10k ? to gndaud audio total harmonic distortion plus noise vs. frequency max4397 toc09 frequency (khz) thd+n (%) 10 1 0.001 0.01 0.1 0 0.0001 0.01 100 amplitude = 3.0v rms amplitude = 0.5v rms amplitude = 2.0v rms 0.1 r/g/b video small-signal bandwidth vs. frequency max4397 toc04 frequency (mhz) gain (db) 1 -5 -4 -3 -2 -1 0 1 2 3 4 -6 0.1 10 v in = 100mv p-p r l = 150 ? to gndvid y video small-signal bandwidth vs. frequency max4397 toc05 frequency (mhz) gain (db) 1 -5 -4 -3 -2 -1 0 1 2 3 4 -6 0.1 10 v in = 100mv p-p r l = 150 ? to gndvid video crosstalk vs. frequency max4397 toc06 frequency (mhz) crosstalk (db) 1 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 0.1 10 v in = 100mv p-p r l = 150 ? to gndvid power-supply rejection ratio vs. frequency max4397 toc10 frequency (khz) psrr (db) 10 1 0.1 0.01 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 -100 0 with respect to v 12 with respect to v aud v vid quiescent supply current vs. temperature max4397 toc11 temperature ( c) v vid quiescent supply current (ma) 50 25 55 60 65 70 75 80 50 075 all video output amplifiers enabled no load t ypical operating characteristics (continued) (v 12 = 12v, v vid = v aud = 5v, 0.1? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v aud to gndaud, v 12 to gndaud, v vid to gndvid no load, t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.)
max4397 audio/video switch for dual scart connectors 8 _______________________________________________________________________________________ t ypical operating characteristics (continued) (v 12 = 12v, v vid = v aud = 5v, 0.1? x5r capacitor in parallel with a 10? aluminum electrolytic capacitor from v aud to gndaud, v 12 to gndaud, v vid to gndvid no load, t a = 0? to +70?, unless otherwise noted. typical values are at t a = +25?.) v vid standby quiescent supply current vs. temperature max4397 toc12 temperature ( c) v vid standby quiescent supply current (ma) 50 25 35 40 45 50 30 075 all video output amplifiers disabled v 12 quiescent supply current vs. temperature max4397 toc13 temperature ( c) v 12 quiescent supply current (ma) 50 25 075 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 1.0 v aud quiescent supply current vs. temperature max4397 toc14 temperature ( c) v aud quiescent supply current (ma) 50 25 075 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 input clamp and bias level vs. temperature max4397 toc15 temperature ( c) input clamp and bias level (v) 50 25 075 0.7 0.9 1.1 1.3 1.7 1.5 1.9 2.1 2.3 2.5 0.5 bottom level clamp bias input clamp current vs. temperature max4397 toc16 temperature ( c) input clamp current ( a) 50 25 075 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 2.0 v in = 1.75v input clamp current vs. input voltage max4397 toc17 input voltage (v) input clamp current (ma) 4 3 2 1 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 05 output bias voltage vs. temperature max4397 toc18 temperature ( c) output bias voltage (v) 50 25 0.5 1.0 1.5 2.0 2.5 3.0 0 075 chroma rgb, luma, cvbs
max4397 audio/video switch for dual scart connectors _______________________________________________________________________________________ 9 pin description pin MAX4397D max4397s name function 11 sda bidirectional data i/o. i 2 c-compatible, 2-wire interface data input/output. output is open drain. 22 scl serial clock input. i 2 c-compatible, 2-wire clock interface. 33 dev_addr device address set input. connect to gndvid to set write and read addresses of 94h or 95h, respectively. connect to v vid to set write and read address of 96h or 97h, respectively. 4 enc_inl+ digital encoder left-channel audio positive input ? enc_inl digital encoder left-channel audio input 5 enc_inl- digital encoder left-channel audio negative input 5, 7 n.c. no connection. not internally connected. 6 enc_inr+ digital encoder right-channel audio positive input ? enc_inr digital encoder right-channel audio input 7 enc_inr- digital encoder right-channel audio negative input 88 vcr_inr vcr scart right-channel audio input 99 vcr_inl vcr scart left-channel audio input 10 10 tv_inr tv scart right-channel audio input 11 11 tv_inl tv scart left-channel audio input 12 12 gndaud audio ground 13 13 aud_bias audio input bias voltage. bypass aud_bias with a 47? capacitor and a 0.1? capacitor to audgnd. 14 14 v aud audio supply. connect to a +5v supply. bypass with a 10? aluminum electrolyte capacitor in parallel with a 0.47? low-esr ceramic capacitor to gndaud. 15 15 vcr_outr vcr scart right-channel audio output 16 16 vcr_outl vcr scart left-channel audio output 17 17 rf_mono_out rf modulator mono audio output 18 18 tv_outl tv scart left-channel audio output 19 19 tv_outr tv scart right-channel audio output 20 20 v 12 +12v supply. bypass v 12 with a 10? capacitor in parallel with a 0.1? capacitor to ground. 21 21 tv_ss tv scart bidirectional slow-switch signal 22 22 vcr_ss vcr scart bidirectional slow-switch signal 23 23 set filter cutoff frequency set input. connect 100k ? resistor from set to ground. 24, 36 24, 36 v vid video and digital supply. connect to a +5v supply. bypass with a 0.01? capacitor to gndvid. v vid also serves as a digital supply for the i 2 c interface. 25 25 vcrin_fs vcr scart fast-switching input 26 26 encin_fs digital encoder fast-switching input 27 27 tvout_fs tv scart fast-switching output. this signal is used to switch the tv to its rgb inputs for on-screen display purposes. 28 28 gndvid video ground
max4397 audio/video switch for dual scart connectors 10 ______________________________________________________________________________________ pin description (continued) pin MAX4397D max4397s name function 29 29 rf_cvbs_out rf modulator composite video output. internally biased at 1v. 30 30 tv_y/cvbs_out tv scart luma/composite video output. internally biased at 1v. 31 31 tv_r/c_out tv scart red/chroma video output. internally biased at 1v for red video signal and 2.2v for chroma video signal. 32 32 tv_g_out tv scart green video output. internally biased at 1v. 33 33 tv_b_out tv scart blue video output. internally biased at 1v. 34 34 vcr_y/cvbs_out vcr scart luma/composite video output. internally biased at 1v. 35 35 vcr_r/c_out vcr scart red/chroma video output. internally biased at 1v for red video signals and 2.2v for chroma video signal. 37 37 tv_r/c_in tv scart red/chroma video input. internally biased at 1.2v for red video signals, or 1.9v for chroma video signals. 38 38 tv_y/cvbs_in tv scart luma/composite video input. internally biased at 1.2v. 39 39 vcr_y/cvbs_in vcr scart luma/composite video input. internally biased at 1.2v. 40 40 vcr_r/c_in vcr scart red/chroma video input. internally biased at 1.2v for red video signals and 1.9v for chroma video signals. 41 41 vcr_g_in vcr scart green video input. internally biased at 1.2v. 42 42 vcr_b_in vcr scart blue video input. internally biased at 1.2v. 43 43 enc_y/cvbs_in digital encoder luma/composite video input. internally biased at 1.2v. 44 44 enc_r/c_in digital encoder red/chroma video input. internally biased at 1.2v for red video signals, or 1.9v for chroma video signals. 45 45 enc_g_in digital encoder green video input. internally biased at 1.2v. 46 46 enc_b_in digital encoder blue video input. internally biased at 1.2v. 47 47 enc_y_in digital encoder luma video input. internally biased at 1.2v. 48 48 enc_c_in digital encoder chroma video input. internally biased at 1.9v. ep ep gndaud exposed paddle. solder to the circuit board ground (gndaud) for proper thermal and electrical performance. detailed description the max4397 is a switch matrix that routes audio and video signals between different ports using the i 2 c interface. the ports consist of the mpeg decoder out- put, and two scart connectors for the tv and vcr. per en50049 and iec 933, the encoder can only input a signal to the scart connector, while tv and vcr scart connectors are bidirectional. the max4397 circuitry consists of four major sections: the video section, the audio section, the slow- and fast- switching section, and the digital interface. the video section consists of clamp and bias circuitry, input buffers, reconstruction filters, a switch matrix, a y/c mixer, and output buffers. all video inputs are ac- coupled through a 0.1? capacitor to set an acceptable dc level using clamp or bias networks. the bidirection- al red/chroma outputs can be connected to ground using i 2 c control to make them terminations when red/chroma is an input (see the video inputs section). the audio section features an input buffer, a switching matrix, volume- or gain-control circuitry, and output dri- vers. the audio inputs are ac-coupled through a 0.1? capacitor. only the audio encoder inputs of the MAX4397D are different from the max4397s. the max4397s has a single-ended audio encoder input while the audio encoder input for the MAX4397D is dif- ferential. the tv output audio path has volume control from -56db to +6db in 2db steps, while the vcr output audio path has volume control from -6db to +6db in 6db steps. the max4397 can be configured to switch inputs during a zero-crossing function to reduce clicks.
max4397 audio/video switch for dual scart connectors ______________________________________________________________________________________ 11 the slow-switching feature allows for bidirectional, tri- level, slow-switching input and output signals at pin vcr_ss and tv_ss, respectively. the slow-switching signals from the vcr set the aspect ratio or video source of the tv screen. see the slow switching section. fast switching consists of two inputs from the encoder and vcr, and one output to the tv to insert an on- screen display (osd). fast switching is used to route video signals from the vcr or from the encoder to the tv. in addition, the fast-switching output can be config- ured to a high or low voltage. fast switching is con- trolled through the i 2 c interface. the digital block contains the 2-wire interface circuitry, control, and status registers. the max4397 can be configured through an i 2 c-compatible interface. dev_addr sets the i 2 c-compatible address. scart video switching the max4397 switches video signals between an mpeg decoder, tv scart, and vcr scart. the video switch includes reconstruction filters, multiplexed video ampli- fiers, and a y-c mixer driver for an rf modulator. see figure 1 for the functional diagram of the video section. while the scart connector supports rgb, s-video, and composite video formats, rgb, and s-video typically share a bidirectional set of scart connector pins. clamp/bias tv_r/c_in clamp tv_y/cvbs_in clamp vcr_b_in clamp vcr_g_in clamp/bias vcr_r/c_in vcrin_fs clamp vcr_y/cvbs_in clamp enc_y/cvbs_in clamp/bias enc_r/c_in clamp enc_g_in clamp enc_b_in clamp enc_y_in encin_fs bias enc_c_in 0.7v 0.7v 2k ? 2k ? vcr_y/cvbs_out vcr_r/c_out tv_r/c_out tv_g_out tv_b_out tv_y/cvbs_out tvout_fs rf_cvbs_out bias 5v 0v pulldown tvrcout vga 5db, 6db, or 7db pulldown vcrrcout x2 x2 x2 x1 x2 vga 5db, 6db, or 7db vga 5db, 6db, or 7db n n max4397 filter filter mixer filter filter filter filter figure 1. max4397 video section functional diagram
max4397 video inputs all video inputs are ac-coupled with an external 0.1? capacitor. either a clamp or bias circuit sets the dc input level of the video signals. the clamp circuit posi- tions the sync tip of the composite (cvbs), the component rgb, or the s-video luma signal. if the sig- nal does not have a sync tip, then the clamp positions the minimum of the signal at the clamp voltage. the bias circuitry is used to position the s-video chroma signal at midlevel of the luma (y) signal. on the video inputs that can receive either a chroma or a red video signal, the bias or clamp circuit is selected through i 2 c. see tables 3?2 for loading register details. the mpeg decoder and vcr uses the rgb format and fast switching to insert an on-screen display (osd), usu- ally text, onto the tv. the max4397 supports rgb as an input from either the vcr or the mpeg decoder and as an output only to the tv. the red video signal of the rgb format and the chroma video signal of the s-vhs format share the same scart connector pin. therefore, rgb and s-video signals cannot be present at the same time. loop-through is possible with a composite video signal but not with rgb signals because the rgb scart pins are used for both input and output. in scart, there is the possibility of a bidirectional use of the red/chroma pin. when using the red/chroma pin as an input port, terminate the red/chroma output with a 75 ? resistor to ground. thus, a ground state is provided by an active pulldown to gndvid on the red/chroma output to support the bidirectional chroma or red i/o, turning the output source resistors into ter- minations (see figure 2). the active pulldown also pro- vides the ?ute output?function, and disables the deselected video outputs. the ?ute output?state is the default power-on state for video. for high-quality home video, the mpeg decoder, vcr, and tv use the s-video format. the max4397 supports s-video signals as an input from the vcr, the mpeg decoder, and the tv, and also as a separately switch- able output to the tv and vcr. because s-video sup- port was not included in the original specifications of the scart connector, the luma (y) signal of s-video and the cvbs signal share the same scart connector pins. if s-video is present, then a composite signal must be created from the y and c signals to drive the rf_cvbs_out pin. for s-video, loop-through is not possible since the chroma scart port is used for both input and output. the max4397 supports composite video (cvbs) for- mat, with inputs from the vcr, mpeg decoder, and tv. full loop-through is possible to the tv and vcr only, since the mpeg decoder scart connector has sepa- rate input and output pins for the cvbs format. audio/video switch for dual scart connectors 12 ______________________________________________________________________________________ clamp n clamp/bias tv_r/c_in video input tv_r/c_in video input 75 ? 0.1 f 0.1 f 75 ? pin 15 pin 13 pin 15 pin 13 max4397 max4397 tv_r/c_out pulldown scart cable scart connectors pulldown clamp n tv_r/c_out clamp/bias figure 2. bidirectional scart pins
video outputs the dc level at the video outputs is controlled so that coupling capacitors are not required, and all of the video outputs are capable of driving a dc-coupled, 150 ? , back-terminated coax load with respect to ground. since some televisions and vcrs use the hori- zontal sync height for automatic gain control, the max4397 accurately reproduces the sync height to within ?%. slow switching the max4397 supports the iec 933-1, amendment 1, tri-level slow switching that selects the aspect ratio for the display (tv). under i 2 c-compatible control, the max4397 sets the slow-switching output voltage level. table 1 shows the valid input levels of the slow-switch- ing signal and the corresponding operating modes of the display device. two bidirectional ports are available for slow-switching signals for the tv and vcr. the slow-switching input status is continuously read and stored in the register 0eh. the slow-switching outputs can be set to a logic level or high impedance by writing to registers 07h and 09h. see tables 8 and 10 for details. fast switching the vcr or mpeg decoder outputs a fast-switching signal to the display device or tv to insert on-screen display (osd). the fast-switching signal can also be set to a constant high or low output signal through the i 2 c interface. the fast-switching output can be set through writing to register 07h. y/c mixer the max4397 includes an on-chip mixer to produce composite video (cvbs) when s-video (y and c) is present. the composite video drives the rf_cvbs_out output pin. the circuit sums y and c signals to obtain the cvbs component. a +6db output buffer drives rf_cvbs_out. video reconstruction filter the encoder dac outputs need to be lowpass-filtered to reject the out-of-band noise. the max4397 inte- grates the reconstruction filter. the filter is fourth order, which is composed of two sallen-key biquad in cas- cade, implementing a butterworth-type transfer func- tion. the internal reconstruction filters feature a 6mhz cutoff frequency, and -35db minimum attenuation at 27mhz. note that the set pin is used to set the accura- cy of the filter cutoff frequency. connect a 100k ? resis- tor from set to ground. scart audio switching audio inputs all audio inputs for the max4397s are single-ended and are ac-coupled. the MAX4397D audio inputs are singled-ended and ac-coupled except for the audio encoder input, which is differential dc-coupled. the audio block has three stereo audio inputs from the tv, the vcr, and the mpeg decoder scart. each input has a 100k ? resistor connected to an internally generated voltage equal to 0.23 x v 12 , except for the encoder input of the MAX4397D, where the dc bias is fixed externally. max4397 audio/video switch for dual scart connectors ______________________________________________________________________________________ 13 table 1. slow-switching modes slow-switching signal voltage (v) mode 0 to 2 display device uses an internal source such as a built-in tuner to provide a video signal 4.5 to 7.0 display device uses a video signal from the scart connector and sets the display to 16:9 aspect ratio 9.5 to 12.6 display device uses a signal from the scart connector and sets the display to 4:3 aspect ratio
max4397 audio outputs both right and left channels have a stereo output for the tv and vcr scart. the monaural output, which is a mix of the tv right and left channels, drives the rf modulator, rf_mono_out. the monaural mixer, a resistor summer, attenuates the amplitude of each of the two signals by 6db. a 12.54db gain block follows the monaural mixer. if the left and right audio channels were completely uncorrelated, then a 9.54db gain block is used. see figures 3 and 4 for the functional diagram of the audio section. clickless switching the tv channel incorporates a zero-crossing detect (zcd) circuit that minimizes click noise due to abrupt signal level changes that occur when switching between audio signals at an arbitrary moment. audio/video switch for dual scart connectors 14 ______________________________________________________________________________________ enc_inl+ audio inputs audio outputs enc_inl- tv_inl vcr_inl diff/se diff/se mute mute mute /2 mute mute mute mute mute is an internal signal -6db, 0db, or +6db -6db, 0db, or +6db 9.54db 9.54db 12.54db gndaud 9.54db zcd tv_outl rf_mono_out tv_outr volume control bypass volume control +6db to -56db volume control +6db to -56db i 2 c vcr_outl vcr_outr 9.54db enc_inr+ enc_inr- tv_inr vcr_inr volume control bypass figure 3. MAX4397D audio section functional diagram
to implement the zero-crossing function when switch- ing audio signals, set the zcd bit by loading register 00h through the i 2 c-compatible interface (if the zcd bit is not already set). then set the mute bit low by loading register 00h. next, wait for a sufficient period of time for the audio signal to cross zero. this period is a function of the audio signal path? low-frequency 3db corner (f l3db ). thus, if f l3db = 1khz, the time period to wait for a zero-crossing detect is 1 / 2 khz or 0.5ms. max4397 audio/video switch for dual scart connectors ______________________________________________________________________________________ 15 audio inputs audio outputs enc_inl tv_inl vcr_inl mute mute mute /2 mute mute mute mute mute is an internal signal -6db, 0db, or +6db -6db, 0db, or +6db 9.54db 9.54db 12.54db gndaud 9.54db zcd tv_outl rf_mono_out tv_outr volume control bypass volume control +6db to -56db volume control +6db to -56db i 2 c vcr_outl vcr_outr 9.54db enc_inr tv_inr vcr_inr volume control bypass figure 4. max4397s audio section features singled-ended encoder input
max4397 volume control the tv channel volume control ranges from -56db to +6db in 2db steps. the vcr volume control settings are programmable for -6db, 0db, and +6db. these gain levels are referenced to the application inputs, where some dividers are present. with the zcd bit set, the tv volume control switches only at zero-crossings, thus minimizing click noise. the tv outputs can bypass the volume control. likewise, the monaural output signal can be processed by the tv volume control or it can bypass the volume control. digital section serial interface the max4397 uses a simple 2-wire serial interface requiring only two standard microprocessor port i/o lines. the fast-mode i 2 c-compatible serial interface allows communication at data rates up to 400kbps or 400khz. figure 5 shows the timing diagram of the sig- nals on the 2-wire interface. the two bus lines (sda and scl) must be at logic-high when the bus is not in use. the max4397 is a slave device and must be controlled by a master device. pullup resistors from the bus lines to the supply are required when push-pull circuitry is not driving the lines. the logic level on the sda line can only change when the scl line is low. the start and stop conditions occur when sda toggles low while the scl line is high (see figure 5). data on sda must be stable for the duration of the setup time (t su,dat ) before scl goes high. data on sda is sampled when scl toggles high with data on sda stable for the duration of the hold time (t hd,dat ). note that data is transmitted in an 8-bit byte. a total of nine clock cycles are required to transfer a byte to the max4397. the device acknowledges the successful receipt of the byte by pulling the sda line low during the 9th clock cycle. audio/video switch for dual scart connectors 16 ______________________________________________________________________________________ scl sda t low t f t r t hd , sta t hd , dat t hd , sta t su , dat t su , sta t buf t su , sta start condition repeated start condition start condition figure 5. sda and scl signal timing diagram
2-wire interface data format i 2 c compatibility the max4397 is compatible with existing i 2 c systems. scl and sda are high-impedance inputs. sda has an open drain that pulls the bus line to a logic-low during the 9th clock pulse. figure 6 shows a typical i 2 c inter- face application. the communication protocol supports the standard i 2 c 8-bit communications. the max4397 address is compatible with the 7-bit i 2 c addressing protocol only; 10-bit format is not supported. digital inputs and interface logic the i 2 c-compatible, 2-wire interface has logic levels defined as v il = 0.8v and v ih = 2.0v. all of the inputs include schmitt-trigger buffers to accept low-transition interfaces. the digital inputs are compatible with 3v cmos logic levels. programming connect dev_addr to ground to set the max4397 write and read address as shown in table 2. data register writing and reading program the scart video and audio switches by writ- ing to registers 00h through 0eh. registers 00h through 0eh can also be read, allowing read-back of data after programming and facilitating system debugging. the status register is read-only and can be read from address 0eh. see tables 3?2 for register program- ming information. applications information hot-plug of scart connectors the max4397 features high-esd protection on all scart inputs and outputs, and requires no external transient-voltage suppressor (tvs) devices to protect against floating chassis discharge. some set-top boxes have a floating chassis problem in which the chassis is not connected to earth ground. as a result, the chassis can charge up to 500v. when a scart cable is con- nected to the scart connector, the charged chassis can discharge through a signal pin. the equivalent cir- cuit is a 2200pf capacitor charged to 311v connected through less than 0.1 ? to a signal pin. the max4397 is soldered on the pc board when it experiences such a discharge. therefore, the current spike flows through the esd protection diodes and is absorbed by the sup- ply bypass capacitors, which have high capacitance and low esr. to better protect the max4397 against excess voltages during the cable discharge condition, place an addi- tional 75 ? resistor in series with all inputs and outputs to the scart connector. for harsh environments where ?5kv protection is needed, the max4385e and max4386e single and quad high-speed op amps fea- ture the industry? first integrated ?5kv esd protection on video inputs and outputs. max4397 audio/video switch for dual scart connectors ______________________________________________________________________________________ 17 c scl scl sda v vid max4397 scl sda v dd scl sda v dd device 2 device 1 sda figure 6. typical i 2 c interface application address pin state write address read address v vid 96h 97h gndvid 94h 95h table 2. slave address programming s slave address a register address a data2 a p write and read mode s = start condition, a = acknowledge, p = stop condition
max4397 power supplies and bypassing the max4397 features single 5v and 12v supply opera- tion and requires no negative supply. the +12v supply v 12 is for the scart switching function. for pin v 12 , place all bypass capacitors as close as possible with a 10? capacitor in parallel with a 0.1? ceramic capacitor. connect all v aud pins together to +5v and bypass with a 10? electrolytic capacitor in parallel with a 0.47? low- esr ceramic capacitor to audio ground. bypass v aud pins with a 0.1? capacitor to audio ground. bypass aud_bias to audio ground with a 10? electrolytic in parallel with a 0.1? ceramic capacitor. bypass v dig with a 0.1? ceramic capacitor to digital ground. bypass each v vid to video ground with a 0.1? ceramic capacitor. connect v vid in series with a 200nh ferrite bead to the +5v supply. layout and grounding for optimal performance, use controlled-impedance traces for video signal paths and place input termina- tion resistors and output back-termination resistors close to the max4397. avoid routing video traces par- allel to high-speed data lines. the max4397 provides separate ground connections for video, audio, and digital supplies. for best perfor- mance, use separate ground planes for each of the ground returns and connect all three ground planes together at a single point. refer to the max4397 evalu- ation kit for a proven circuit board layout example. audio/video switch for dual scart connectors 18 ______________________________________________________________________________________ register address (hexadecimal) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 00h tv volume bypass zcd tv volume control tv audio output mute 01h vcr volume control not used not used vcr audio selection tv audio selection 02h not used 03h not used 04h not used 05h not used 06h tv_r/c_in clamp rgb gain tv g and b video switch tv video switch 07h not used rf_cvbs_ out switch tv_y/ cvbs_out switch tv fast blank (fast switching) tv_r/c_out ground set function tv 08h vcr_r/ c_in clamp not used not used not used enc_r/ c_in clamp vcr video switch 09h not used not used not used not used not used vcr_r/c_out ground set function vcr 0ah not used 0bh not used 0ch not used 0dh vcr_y/ cvbs_out enable vcr_r/ c_out enable tv_r/c_out enable tv_g_out enable tv_b_out enable tv_y/ cvbs_out enable tvout _fs enable rf_cvbs_ out enable table 3. data format for write mode
max4397 audio/video switch for dual scart connectors ______________________________________________________________________________________ 19 bit description 76543210 comments 0 off tv audio mute 1 on (power-on default) 00000 +6db gain 00001 +4db gain 00010 +2db gain 00011 0db gain (power-on default) 00100 -2db gain 00101 -4db gain 11110 -54db gain tv volume control 11111 -56db gain 0 off tv zero-crossing detector 1 on (power-on default) 0 tv audio passes through volume control (power-on default) tv volume bypass 1 tv audio bypasses volume control table 5. register 00h: tv audio control bit description 76543210 comments 00 encoder audio 01 vcr audio 10 tv audio input source for tv audio 11 mute (power-on default) 00 encoder audio 01 vcr audio 10 tv audio input source for vcr audio 11 mute (power-on default) 00 0db gain (power-on default) 01 +6db gain 10 -6db gain vcr volume control 11 0db gain table 6. register 01h: tv/vcr audio control register address (hexadecimal) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 0eh thermal shdn power-on reset not used vcr slow switch input tv slow switch input table 4. data format for read mode
max4397 audio/video switch for dual scart connectors 20 ______________________________________________________________________________________ bit description 76543210 comments tv_y/cvbs_out tv_r/c_out 000 enc_y/cvbs_in enc_r/c_in 001 enc_y_in enc_c_in 010 vcr_y/cvbs_in vcr_r/c_in 011 tv_y/cvbs_in tv_r/c_in 100 not used not used 101 mute mute 110 mute mute 111 mute (power-on default) mute (power-on default) input sources for tv video tv_g_out tv_b_out 00 enc_g_in enc_b_in 01 vcr_g_in vcr_b_in 10 mute mute input sources for tv_g_out and tv_b_out 11 mute (power-on default) mute (power-on default) 00 6db (power-on default) 01 7db 10 5db rgb gain 11 5db 0 dc restore clamp active at input (power-on default) tv_r/c_in clamp/bias 1 chrominance bias applied at input table 7. register 06h: tv video input control
max4397 audio/video switch for dual scart connectors ______________________________________________________________________________________ 21 bit description 76543210 comments 00 low (<2v), internal source (power-on default) 01 medium (4.5v to 7v), external scart source with 16:9 aspect ratio 10 high impedance set tv function switching 11 high (>9.5v), external scart source with 4:3 aspect ratio 0 normal operation, pulldown on tv_r/c_out is off (power-on default) tv_r/c_out ground 1 ground, pulldown on tv_r/c_out is on, the output amplifier driving tv_r/c_out is turned off 00 0v (power-on default) 01 same level as enc_fb_in 10 same level as vcr_fb_in fast blank (fast switching) 11 v vid 0 composite video from the y/c mixer is output tv_y/cvbs_out switch 1 the tv_y/cvbs_out signal selected in register 06h is output (power-on default) 0 composite video from the y/c mixer is output (power-on default) rf_cvbs_out switch 1 the tv_y/cvbs_out signal selected in register 06h is output table 8. register 07h: tv video output control bit description 76543210 comments vcr_y/cvbs_out vcr_r/c_out 000 enc_y/cvbs_in enc_r/c_in 001 enc_y_in enc_c_in 010 vcr_y/cvbs_in vcr_r/c_in 011 tv_y/cvbs_in tv_r/c_in 100 not used not used 101 mute mute 110 mute mute input sources for vcr video 111 mute (power-on default) mute (power-on default) 0 dc restore clamp active at input (power-on default) vcr_r/c_in clamp/bias 1 chrominance bias applied at input 0 dc restore clamp active at input (power-on default) enc_r/c_in clamp/bias 1 chrominance bias applied at input table 9. register 08h: vcr video input control
max4397 audio/video switch for dual scart connectors 22 ______________________________________________________________________________________ bit description 76543210 comments 00 low (<2v), internal source (power-on default) 01 medium (4.5v to 7v), external scart source with 16:9 aspect ratio 10 high impedance set vcr function switching 11 high (>9.5v), external scart source with 4:3 aspect ratio 0 normal operation, pulldown on vcr_r/c_out is off (power-on default) vcr_r/c_out ground 1 ground, pulldown on vcr_r/c_out is on, the output amplifier driving vcr_r/c_out is turned off table 10. register 09h: vcr video output control bit description 76543210 comments 0 off (power-on default) rf_cvbs_out 1on 0 off (power-on default) tvout_fs 1on 0 off (power-on default) tv_y/cvbs_out 1on 0 off (power-on default) tv_b_out 1on 0 off (power-on default) tv_g_out 1on 0 off (power-on default) tv_r/c_out 1on 0 off (power-on default) vcr_r/c_out 1on 0 off (power-on default) vcr_y/cvbs_out 1on table 11. register 0dh: output enable
max4397 audio/video switch for dual scart connectors ______________________________________________________________________________________ 23 bit description 765 43210 comments 00 0 to 2v, internal source 01 4.5v to 7v, external source with 16:9 aspect ratio 10 not used tv slow switch input 11 9.5v to 12.6v, external source with 4:3 aspect ratio 00 0 to 2v, internal source 01 4.5v to 7v, external source with 16:9 aspect ratio 10 not used vcr slow switch input 11 9.5v to 12.6v, external source with 4:3 aspect ratio 0v vid is too low for digital logic to operate power-on reset 1v vid is high enough for digital logic to operate 0 the part is in thermal shutdown thermal shutdown 1 the temperature is below the tshd limit table 12. register 0eh status
max4397 audio/video switch for dual scart connectors 24 ______________________________________________________________________________________ t ypical application circuits MAX4397D all capacitors are 0.1 f and all resistors are 75 ?, unless otherwise noted. vcr_y/cvbs_out vcr_y/cvbs_in 10 11 12 sda 1 scl 2 dev_addr 3 enc_inl+ enc_inl- 4 5 enc_inr+ enc_inr- 6 7 vcr_inr 8 3.3k ? 9.4k ? 9.4k ? 9 rf_cvbs_out tv_y/cvbs_out tv_r/c_out tv_g_out tv_b_out vcr_r/c_out v vid vcr_g_in vcr_b_in enc_y/cvbs_in enc_r/c_in enc_g_in enc_b_in enc_y_in enc_c_in enc_c_in_sc 37 38 39 40 41 42 43 44 45 46 47 48 vcr_inl tv_inr tv_inl gndaud sda scl dev_addr enc_inl+_sc enc_inl-_sc enc_inr+_sc enc_inr-_sc vcr_inr_sc vcr_inl_sc tv_inr_sc tv_inl_sc tvout_fs gndvid encin_fs vcrin_fs vcr_y/cvbs_out_sc rf_cvbs_out_sc tv_y/cvbs_out_sc tv_r/c_out_sc tv_g_out_sc tv_b_out_sc vcr_r/c_out_sc tvout_fs vcr_r/c_in tv_y/cvbs_in tv_r/c_in vcr_ss v 12 tv_outr tv_outr_sc tv_outl rf_mono_out vcr_outl vcr_outr v aud aud_bias tv_ss set v vid enc_y_in_sc enc_b_in_sc enc_b_in_sc enc_r/c_in_sc enc_y/cvbs_in_sc vcr_b_in_sc vcr_g_in_sc vcr_r/c_in_sc vcr_y/cvbs_in_sc tv_y/cvbs_in_sc tv_r/c_in_sc 3.3k ? 4.7k ? 4.7k ? 4.7k ? 4.7k ? 3.3k ? 3.3k ? 3.3k ? 3.3k ? 3.3k ? 3.3k ? 3.3k ? 3.3k ? 27 26 25 36 10 f 10k ? 10k ? 35 34 33 32 31 30 29 28 tv_outl_sc rf_mono_out_sc vcr_outl_sc vcr_outr_sc 24 23 22 21 10k ? 20 19 18 17 16 15 14 13 10k ? 100k ? 10 f 10 f 10 f 10 f 10 f 10 f 10 f10 f10 f 3.3k ? 3.3k ?
max4397 audio/video switch for dual scart connectors ______________________________________________________________________________________ 25 max4397s all capacitors are 0.1 f and all resistors are 75 ?, unless otherwise noted. vcr_y/cvbs_out vcr_y/cvbs_in 10 11 12 sda 1 scl 2 dev_addr 3 enc_inl+ n.c. 4 5 enc_inr+ n.c. 6 7 vcr_inr 8 3.3k ? 4.7k ? 9 rf_cvbs_out tv_y/cvbs_out tv_r/c_out tv_g_out tv_b_out vcr_r/c_out v vid vcr_g_in vcr_b_in enc_y/cvbs_in enc_r/c_in enc_g_in enc_b_in enc_y_in enc_c_in enc_c_in_sc 37 38 39 40 41 42 43 44 45 46 47 48 vcr_inl tv_inr tv_inl gndaud sda scl dev_addr enc_inl_sc enc_inr_sc vcr_inr_sc vcr_inl_sc tv_inr_sc tv_inl_sc tvout_fs gndvid encin_fs vcrin_fs vcr_y/cvbs_out_sc rf_cvbs_out_sc tv_y/cvbs_out_sc tv_r/c_out_sc tv_g_out_sc tv_b_out_sc vcr_r/c_out_sc tvout_fs vcr_r/c_in tv_y/cvbs_in tv_r/c_in vcr_ss v 12 tv_outr tv_outl rf_mono_out vcr_outl vcr_outr v aud aud_bias tv_ss set v vid enc_y_in_sc enc_b_in_sc enc_b_in_sc enc_r/c_in_sc enc_y/cvbs_in_sc vcr_b_in_sc vcr_g_in_sc vcr_r/c_in_sc vcr_y/cvbs_in_sc tv_y/cvbs_in_sc tv_r/c_in_sc 3.3k ? 4.7k ? 4.7k ? 3.3k ? 3.3k ? 3.3k ? 3.3k ? 3.3k ? 3.3k ? 3.3k ? 3.3k ? 27 26 25 36 10 f 10k ? 10k ? 35 34 33 32 31 30 29 28 24 23 22 21 20 19 18 17 16 15 14 13 47 f 4.7k ? 10k ? 10k ? 100k ? 10 f 10 f 10 f 10 f 10 f10 f10 f 10 f tv_outl_sc tv_outr_sc rf_mono_out_sc vcr_outl_sc vcr_outr_sc 3.3k ? 3.3k ? t ypical application circuits (continued)
max4397 audio/video switch for dual scart connectors 26 ______________________________________________________________________________________ system block diagram max4397 v vid v 12 v aud rf modulator cvbs mono audio tv scart connector rgb, y-c, cvbs r/l audio y-c, cvbs fast switching slow switching slow switching encoder rgb, y-c, cvbs address sda scl l/r audio (differential or se) fast switching vcr scart connector y-c, cvbs l/r audio fast switching rgb, y-c, cvbs ep gndaud gndvid
max4397 audio/video switch for dual scart connectors ______________________________________________________________________________________ 27 pin configurations v vid vcr_r/c_out tv_b_out tv_g_out rf_cvbs_out gndvid tvout_fs vcrin_fs encin_fs tv_r/c_out tv_y/cvbs_out vcr_y/cvbs_out dev_addr enc_inl+ enc_inl- enc_inr+ enc_inr- vcr_inr vcr_inl gndaud tv_inr tv_inl scl sda 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 rf_mono_out tv_outl tv_outr tv_ss v vid set vcr_ss vcr_outl vcr_outr v aud aud_bias enc_y_in enc_b_in enc_g_in enc_r/c_in enc_y/cvbs_in vcr_b_in vcr_g_in vcr_r/c_in vcr_y/cvbs_in tv_r/c_in tv_y/cvbs_in enc_c_in thin qfn MAX4397D v 12 top view 48 47 46 45 44 43 42 41 40 39 38 37 13 14 15 16 17 18 19 20 21 22 23 24
max4397 audio/video switch for dual scart connectors 28 ______________________________________________________________________________________ pin configurations (continued) v vid vcr_r/c_out tv_b_out tv_g_out rf_cvbs_out gndvid tvout_fs vcrin_fs encin_fs tv_r/c_out tv_y/cvbs_out vcr_y/cvbs_out dev_addr enc_inl n.c. enc_inr n.c. vcr_inr vcr_inl gndaud tv_inr tv_inl scl sda 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 rf_mono_out tv_outl tv_outr tv_ss v vid set vcr_ss vcr_outl vcr_outr v aud aud_bias enc_y_in enc_b_in enc_g_in enc_r/c_in enc_y/cvbs_in vcr_b_in vcr_g_in vcr_r/c_in vcr_y/cvbs_in tv_r/c_in tv_y/cvbs_in enc_c_in thin qfn max4397s v 12 top view 48 47 46 45 44 43 42 41 40 39 38 37 13 14 15 16 17 18 19 20 21 22 23 24 chip information transistor count: 13,265 process: bicmos
max4397 audio/video switch for dual scart connectors ______________________________________________________________________________________ 29 32, 44, 48l qfn .eps proprietary information approval title: document control no. 21-0144 package outline 32, 44, 48, 56l thin qfn, 7x7x0.8mm 1 d rev. 2 e l e l a1 a a2 e/2 e d/2 d detail a d2/2 d2 b l k e2/2 e2 (ne-1) x e (nd-1) x e e c l c l c l c l k dallas semiconductor detail b e l l1 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)
max4397 audio/video switch for dual scart connectors maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 30 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. pa ck age information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) proprietary information document control no. approval title: rev. 2 2 21-0144 dallas semiconductor package outline 32, 44, 48, 56l thin qfn, 7x7x0.8mm d

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