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product preview STV6688 video switch matrix for tv applications with s terminal ? this is preliminary information on a new product now in development. details are subject to change without notice. september 2003 1/12 key features n i2c bus control n standby mode n 4 y/cvbs inputs (one for internal tv signal) n 4 c inputs (one for internal tv signal) n 1 y/c adder n 1 y/cvbs and 1 c output, each with 0 db gain n 1 cvbs output with 6 db gain and 150 w buffer for monitor n sync bottom clamp on all cvbs/y and average bias on c inputs n bandwidth: 15 mhz n crosstalk: 50 db (min.) general description the STV6688 is a highly-integrated i2c bus- controlled video switch matrix, optimized for use in color tv applications. it is used to control the switching of 4 video signals. these signals can be in single component form (cvbs) or in two component form (y/c). in both cases, the STV6688 microcontroller provides a cvbs signal for an external device (monitor). pin connections order code : STV6688 pdip20 order code : STV6688a pso20 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 y/cvbs_in1 c_in1 vcc_v y/cvbs_in2 c_in2 gnd_v y/cvbs_in3 c_in3 vdd sda dec y/cvbs_in_tv c_in_tv vcc_b cvbs_out gnd_b y/cvbs_out c_out gnd scl
functional description STV6688 2/12 1 functional description table 1: pin list pin symbol description pin symbol description 1 y/cvbs_in1 y or cvbs signal of ext. input 1 11 scl serial clock line input 2 c_in1 c signal of ext. input 1 12 gnd digital parts ground 3 vcc_v video switch power supply 13 c_out c signal output 4 y/cvbs_in2 y or cvbs signal of ext. input 2 14 y/cvbs_out y/cvbs output 5 c_in2 c signal of ext. input 2 15 gnd_b buffer ground 6 gnd_v video switch ground 16 cvbs_out y and c adder output 7 y/cvbs_in3 y or cvbs signal of ext. input 3 17 vcc b buffer power supply 8 c_in3 c signal of ext. input 3 18 c_in_tv c signal of tv input 9 vdd digital parts power supply 19 y/cvbs_in_tv y or cvbs signal of tv input 10 sda serial data line input 20 dec decoupling figure 1: STV6688 block diagram + 6db buffer i2c bus decoder y/cvbs_in1 y/cvbs_in2 y/cvbs_in3 c_in tv c_in1 c_in2 c_in3 v dd gnd sda scl gnd b gnd v dec v cc v v cc b c_out cvbs_out power video power buffer supply supply 0db y/cvbs_in tv y/cvbs_out mute v ref 19 1 4 7 9 12 10 11 6 15 20 3 17 13 16 14 0db clamp clamp clamp clamp 18 2 5 8
3/12 STV6688 electrical characteristics 2 electrical characteristics t amb = 25c, v ccv = v ccb = v dd =5v, r loadyc =4.7k w, r loadcvbs =150 w , unless otherwise specified. 2.1 thermal data 2.2 y/cvbs section t amb = 25c, v ccv = v ccb = v dd =5v, r loadyc =4.7k w, r loadcvbs =150 w , unless otherwise specified. symbol parameter test conditions min. typ. max. unit v dd digital supply voltage 4.555.5v v cc video operating supply voltage 4.555.5v v ccb buffer supply voltage 4.555.5v active (channels on) i dd digital supply current v dd =5v 3ma i ccv total video supply current (v cc, v ccbi ) v cc =5v, no load v ccv = v ccb = 5v, with loads and signals 13 25 ma standby (all channels off) i dd digital supply current v dd =5v 3ma i ccvstd total video supply current v cc =5v 0.3 ma symbol parameter package value unit r thja maximum junction-to-ambient thermal resistance dip20 (STV6688) 80 c/w so20 (STV6688a) 100 c/w symbol parameter test conditions min. typ. max. unit v dcin dc input level bottom sync pulse 2v i clamp clamping current at v dcin -400 mv 12 ma i leak input leakage current v in =v dcin +1v 110 m a c in input capacitance 2pf v in max input signal v cc =5v 1.5 v pp dyny dynamic y/cvbs output signal v cc =5v 1.5 v pp dyncvbs dynamic cvbs output signal v cc =5v 3 v pp bw bandwidth at -3 db y/cvbs y/c mixer (on cvbs_out) v in =1v pp v in =1v pp 12 8 15 10 mhz
electrical characteristics STV6688 4/12 note: 1 s/n = 20log (v out black to white = 0.7 v pp /v noise (mv rms ) weighted ccir567). 2.3 chroma section t amb = 25c, v ccv = v ccb = v dd =5v, r loadyc =4.7k w, r loadcvbs =150 w , unless otherwise specified. flatness spread of gain in video band (15 khz-5 mhz) y/cvbs y/c mixer (on cvbs_out) v in =1v pp v in =1v pp 0.2 0.5 0.5 1.0 db cti crosstalk isolation between y/cvbs input channels v in =1v pp at f = 4.43 mhz, on one point. 55 60 db cto crosstalk isolation of y/cvbs from c channels v in =1v pp at f = 4.43 mhz, on one point. 50 55 db gycvbs gain at y/cvbs out @1 mhz v in =1v pp -0.5 0 +0.5 db gcvbs gain at cvbs out @1 mhz v in =1v pp 5.566.5db r outy y/cvbs output resistance 2.5 5.0 w r outcvbs cvbs output resistance 15 w g ycvbsm gain matching between y, cvbs inputs v in =1v pp -0.5 0 +0.5 db dc outcvbs dc cvbs output voltage bottom sync pulse 0.8 v dc outy dc y output voltage bottom sync pulse for y 1.3 v dphi differential phase v in =1v pp at f = 4.43 mhz 1 3 deg dg differential gain v in =1v pp at f = 4.43 mhz 15% lnl luminance non-linearity 0.6 3 % vsn video s/n ratio refer to note 1 65 db symbol parameter test conditions min. typ. max. unit v dcin dc input level 3v r in input resistance 30 50 k w c in input capacitance 2 pf v in max input signal 1.5 v pp dyn dynamic output signal 1.5 v pp cbw chroma bandwidth c in = 1 v pp 10 12 mhz cti crosstalk isolation between c input channels c in =0.5v pp at f = 4.43 mhz, on one point. 55 60 db cto crosstalk isolation of c from y channels v in =1v pp at f = 4.43 mhz, on one point. 50 55 db r out output resistance 2.5 5.0 w g outc gain at c_out @4.43 mhz v in =1v pp -0.5 0 +0.5 db dc outc dc output voltage 2.2 v symbol parameter test conditions min. typ. max. unit
5/12 STV6688 electrical characteristics g cm gain matching between c inputs v in =1v pp -0.5 0 +0.5 db ctoydel chroma to luma delay, y/c source v pp @4.43 mhz 5 10 ns symbol parameter test conditions min. typ. max. unit
electrical characteristics STV6688 6/12 2.4 i2c bus characteristics t amb = 25c, v ccv = v ccb = v dd =5v, r loadyc =4.7k w, r loadcvbs =150 w , unless otherwise specified. note: 2 the device can also operate at 400 khz. symbol parameter test conditions min. typ. max. unit address selection input addsel_l address selection low level 0 0.2 v addsel_h address selection high level 2.5 v dd v ileak leakage current 10 m a scl v il low level input voltage -0.3 1.5 v v ih high level input voltage 3 5.5 v i li input leakage current v in = 0 to 5.5 v -10 0 10 a sda v il low level input voltage -0.3 1.5 v v ih high level input voltage 3 5.5 v i li input leakage current v in = 0 to 5.5 v -10 0 10 a c i input capacitance 10 pf t r input rise time 1.5 v to 3 v 1 s t f input fall time 3 v to 1.5 v 300 ns v ol low level output voltage i ol = 3 ma 0.4 v t f output fall time 3 v to 1.5 v 250 ns c l load capacitance 400 pf timing (clock frequency = 100 khz, see note 2 ) t low clock low period 4.7 s t high clock high period 4 s t su,dat data setup time 250 ns t hd,dat data hold time 0 340 ns t su,sto setup time from clock high to stop 4 s t buf start setup time following a stop 4.7 s t hd,sta start hold time 4 s t su,sta start setup time following clock low to high transition 4.7 s
7/12 STV6688 electrical characteristics 2.5 i2c bus selection data transfers follow the usual i2c format: after the start condition (s), a 7-bit slave address is sent, followed by an 8-bit word which is a data direction bit (w). an 8-bit sub-address is sent to select a register, followed by an 8-bit data word to be included in the register. the i2c bus decoder of the microcontroller provides the automatic incrementation mode in write mode. string format: write only mode (s = start condition, p = stop condition, a = acknowledge) input signals summary: (write mode) input signal: (write mode) data byte figure 2: i2c bus timings t buf t low t high t f t r t hd,sta t hd,dat t su,dat t su,sta t su,sto sda scl sda (start, stop) s slave address: 94h a 00h a data a p reg.addr. (hex) data d7 d6 d5 d4 d3 d2 d1 d0 general stand-by buffer stand-by always set to 1 switch control reg. addr. description bits data comments d7 d6 d5 d4 d3 d2 d1 d0 0x00 general stand-by 1 0 1 x x 1 1 x x x x x x x x x x all disabled all active buffer stand-by 1 x x 0 1 1 1 x x x x x x x x x x buffer disabled buffer active y/cvbs and c selection 2x x x x x x x x 1 1 1 1 x x x x x x x x x x x x 0 0 1 1 0 1 0 1 int tv in1 in2 in3
input/output groups STV6688 8/12 3 input/output groups figure 3: bottom clamped video inputs (pins 1, 4, 7 and 19) figure 4: average clamped video inputs (pins 2, 5, 8 and 18) figure 5: video outputs (pins 13, 14 and 16) v cc 5v v cc 5v 2v + v d 15 k w tri protected pad protected pad tri v cc 5v v cc 5v i b 3v 25 k w 25 k w protected pad v ccb1,2 ...7 5v v cc 5v i b
9/12 STV6688 input/output groups figure 6: i2c bus sda (pin 10) figure 7: i2c bus scl (pin 11) protected pad 10 k w acknowledge float v dd 5v 10 k w float protected pad v dd 5v
package mechanical data STV6688 10/12 4 package mechanical data figure 8: 20-pin plastic single in line package (pdip20) dim. mm inches min. typ. max. min. typ. max. a 5.33 0.210 a1 0.38 0.015 a2 2.92 3.30 4.95 0.115 0.130 0.195 b 0.36 0.46 0.56 0.014 0.018 0.022 b2 1.14 1.52 1.78 0.045 0.060 0.070 c 0.20 0.25 0.36 0.008 0.010 0.014 d 24.89 26.92 0.980 1.060 e 2.54 0.100 e1 6.10 6.35 7.11 0.240 0.250 0.280 l 2.92 3.30 3.81 0.115 0.130 0.150
11/12 STV6688 package mechanical data figure 9: 20-pin plastic small outline package, 300-mil width (pso20) dim. mm inches min. typ. max. min. typ. max. a 2.35 2.65 0.0926 0.1043 a1 0.10 0.0040 b 0.33 0.51 0.0130 0.0200 c 0.32 0.0125 d 4.98 13.00 0.1961 0.5118 e 7.40 7.60 0.2914 0.2992 e 1.27 0.050 h 10.01 10.64 0.394 0.419 h 0.25 0.74 0.010 0.029 k 0 8 0 8 l 0.41 1.27 0.016 0.050 g 0.10 0.004 number of pins n20
package mechanical data STV6688 12/12 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result f rom its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information pr eviously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems with out express written approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 2003 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - u.s.a. www.st.com

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