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general description the max4137/MAX4138 are 1-input/4-output voltage- feedback amplifiers that combine high speed with fast switching for video distribution applications. the max4137 is internally set for a closed-loop gain of 2v/v, while the MAX4138 can be externally set for gains of 2v/v or greater. the max4137 achieves a -3db bandwidth of 185mhz, with 0.1db gain flatness to 40mhz. the MAX4138? -3db bandwidth is 140mhz, with 0.1db gain flatness to 40mhz. both devices deliver a 1000v/? slew rate, as well as exceptional full-power bandwidths of 185mhz and 140mhz, respectively. a 25ns channel switching time enables rapid multiplex- ing for picture-in-picture applications, yet maintains a high off-isolation of 75db and all-hostile crosstalk of -50db (f = 30mhz). the max4137/MAX4138? on-board logic selects any combination of the four signal outputs. each output is capable of swinging ?v and delivering up to 65ma of current. for applications that require a 1-input/6-output distribu- tion amplifier, see the max4135/max4136 data sheet. applications video switching and distribution high-resolution rgb crt monitors high-speed analog bus drivers rf signal processing composite video preamplifiers features fixed gain of 2v/v (max4137) external gain set (MAX4138) high speed: 185mhz -3db bandwidth (max4137) 140mhz -3db bandwidth (MAX4138) 1000v/s slew rate high full-power bandwidths (v out = 2vp-p): 185mhz (max4137) 140mhz (MAX4138) 0.1db gain flatness to 40mhz low differential gain/phase error: 0.10%/0.02 high-impedance output disable max4137/MAX4138 1-input/4-output video distribution amplifiers ________________________________________________________________ maxim integrated products 1 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 n.c. sel1 sel2 agnd agnd out1 vcco n.c. top view in+ veei agnd (rg) n.c. (rf) out3 veeo veeo out2 16 15 14 13 9 10 11 12 vcci sel3 sel4 n.c. n.c. vcco out4 agnd so max4137 MAX4138 ( ) are for MAX4138. 19-2001; rev 1; 9/99 part max4137 ewg MAX4138 ewg -40? to +85? -40? to +85? temp. range pin-package 24 wide so 24 wide so evaluation kit available ordering information pin configuration selector guide part no. of outputs gain (v/v) -3db bandwidth (mhz) max4135 6 fixed 2 185 max4136 6 2 140 max4137 4 fixed 2 185 MAX4138 4 2 140 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.
max4137/MAX4138 1-input/4-output video distribution amplifiers 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (v cc = +5v, v ee = -5v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) 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. power-supply voltage (v cc to v ee ).......................................12v voltage on any input pin to gnd .......(v cc + 0.3v) to (v ee - 0.3v) short-circuit duration to gnd....................................continuous continuous power dissipation (t a = +70?) wide so (derate 19.3mw/? above +70?)..................1.54w operating temperature range max4137ewg/MAX4138ewg ........................-40? to +85? storage temperature range .............................-65? to +160? lead temperature (soldering, 10s) .................................+300? v il r l = 30 ? v out = 0v, r l = 150 ? v in = 0v v s = ?.75v to ?.25v v cm = ?.5v f = 1mhz f = 1mhz to 100mhz f = 1mhz MAX4138, either input v out = 0v, r l = 150 ? v out = 0v, r l = v out = 0v, r l = , v in = -v os MAX4138, either input f = 1mhz to 100mhz conditions ? 15 i sel sel input current v 0.8 sel low threshold v 2.0 v ih sel high threshold ma 45 65 i out output current drive 2.2 2.6 ma 47 70 i sy quiescent supply current 30 48 db 55 65 psrr power-supply rejection ratio db 60 cmrr common-mode rejection ratio v ?.5 v cm common-mode input voltage range pf 2 c in input capacitance na rms 30 i n input current noise mv 110 v os input offset voltage pa/ hz 2.4 ? rms 88 e n input voltage noise nv/ hz 7 pf 2 c in(cm) common-mode input capacitance mv 18 input offset voltage match between channels ?/? 30 tcv os input offset voltage drift ? 4.5 13 i b input bias current m ? 5 r in(cm) common-mode input resistance units min typ max symbol parameter r l = 150 ? v -2.0 -2.5 v out output voltage swing positive negative all channels off all channels on
max4137/MAX4138 1-input/4-output video distribution amplifiers _______________________________________________________________________________________ 3 ac electrical characteristics (v cc = +5v, v ee = -5v, a vcl = 2v/v, t a = t min to t max , unless otherwise noted. typical values are at t a = 25?.) v out 0.1v rms, a vcl = 2v/v f = dc, a vcl = 2v/v f = dc, a vcl = 2v/v f c = 5mhz, a vcl = 2v/v, v out = 2vp-p, r l = 100 ? v in = 1vp-p, f = 30mhz v in = 1vp-p, f = 30mhz v in = 0v dc -1v v out +1v, r l =150 ? , a vcl = 2v/v v out = 2vp-p , a vcl = 2v/v a vcl = 2v/v -2v v out +2v conditions pf 2 c out(on) output on-capacitance k ? 200 r out output off-resistance ? 1 r out output on-resistance dbc -72 sfdr spurious-free dynamic range mv ? digital switching feedthrough ns 25 t on channel switching on time ns 25 t off channel switching off time mhz 140 bw -3db -3db bandwidth 185 db 75 off isolation db -50 all-hostile crosstalk ns 40 t s settling time 17 185 mhz 140 fpbw full-power bandwidth mhz 40 0.1db bandwidth v/? 1000 sr slew rate units min typ max symbol parameter max4137 MAX4138 max4137 MAX4138 to 0.1% to 0.01% max4137 f = 3.58mhz , a vcl = 2v/v MAX4138 % 0.10 dg differential gain 0.10 max4137 f = 3.58mhz , a vcl = 2v/v MAX4138 degrees 0.02 dp differential phase 0.02 pf 3.5 c out(off) output off-capacitance
max4137/MAX4138 1-input/4-output video distribution amplifiers 4 _______________________________________________________________________________________ __________________________________________typical operating characteristics (v cc = +5v, v ee = -5v, r l = 150 ? , t a = +25?, unless otherwise noted.) 10 0 100k 100m 1m 10m 1g max4137 small-signal gain vs. frequency (a vcl = +2) 2 max4137/8 toc-01 frequency (hz) gain (db) 4 6 8 9 1 3 5 7 11 1 100k 100m 1m 10m 1g MAX4138 small-signal gain vs. frequency (a vcl = +2) 3 max4137/8 toc-02 frequency (hz) gain (db) 5 7 9 10 2 4 6 8 11 1 100k 100m 1m 10m 1g MAX4138 small-signal gain vs. frequency (a vcl = +10) 3 max4137/8 toc-03 frequency (hz) gain (db) 5 7 9 10 2 4 6 8 11 1 100k 100m 1m 10m 1g max4137 large-signal gain vs. frequency (a vcl = +2) 3 max4137/8 toc-04 frequency (hz) gain (db) 5 7 9 10 2 4 6 8 v out = 2vp-p -110 -100 100k 100m 1m 10m -80 max4137/8 toc-7 frequency (hz) all-hostile crosstalk (db) -60 -40 -90 -70 -50 -30 -20 -10 all-hostile crosstalk vs. frequency 11 1 100k 100m 1m 10m 1g MAX4138 large-signal gain vs. frequency (a vcl = +2) 3 max4137/8 toc-05 frequency (hz) gain (db) 5 7 9 10 2 4 6 8 v out = 2vp-p -15 -115 100k 100m 1m 10m 1g off-isolation vs. frequency -95 max4137/8 toc-06 frequency (hz) gain (db) -75 -55 -35 -25 -105 -85 -65 -45 0.08 0.25 100k 100m 1m 10m closed-loop output impedance vs. frequency 2.5 max4137-08 frequency (hz) impedance ( ? ) 25 250 0.8 8.0 80 800 1 10 100 11k 10 100 10k 100k 1m 10m input voltage noise vs. frequency max4137-8 frequency (hz) noise (nv/ hz )
max4137/MAX4138 1-input/4-output video distribution amplifiers _______________________________________________________________________________________ 5 max4137 large-signal pulse response (a vcl = +2) time (10ns/div) voltage (500mv/div) gnd gnd in out max4137-10 MAX4138 small-signal pulse response (a vcl = +2) time (10ns/div) voltage (50mv/div) gnd gnd max4137-13 in out MAX4138 large-signal pulse response (a vcl = +2) time (10ns/div) voltage (500mv/div) gnd gnd max4137-11 in out max4137 small-signal pulse response (a vcl = +2) time (10ns/div) gnd gnd voltage (50mv/div) max4137-12 in out digital feedthrough time (20ns/div) sel (1v/div) out (45mv/div) max4137-14 ____________________________typical operating characteristics (continued) (v cc = +5v, v ee = -5v, r l = 150 ? , t a = +25?, unless otherwise noted.)
max4137/MAX4138 1-input/4-output video distribution amplifiers 6 _______________________________________________________________________________________ ____________________________typical operating characteristics (continued) (v cc = +5v, v ee = -5v, r l = 150 ? , t a = +25?, unless otherwise noted.) 0 -100 100k 1m 100m MAX4138 harmonic distortion vs. frequency (g = +2, v o = 2vp-p, r l = 100 ? ) -70 -30 -20 -10 -40 -50 -60 -80 -90 max4137/8 toc-16 frequency (hz) harmonic distortion (dbc) 10m 2nd harmonic 3rd harmonic -0.00 0.05 -0.05 -0.10 -0.15 -0.03 0 100 0 100 differential gain and phase -0.01 -0.02 ire ire phase (deg) gain (%) 0.01 0.00 max4137/8 toc-17 a vcl = 2v/v r l = 150 ? a vcl = 2v/v r l = 150 ? 5.0 25 125 100 75 50 150 max4137 output swing vs. load resistance 5.5 3.5 4.0 4.5 3.0 2.5 2.0 max4137/8 toc-19 load resistance ( ? ) output swing (vp-p) 8 1 -75 100 125 50 75 025 -50 -25 150 input bias current vs. temperature 6 7 5 4 3 2 max4137/8-toc-22 temperature (?) current ( a) 2 -5 -75 100 125 50 75 025 -50 -25 150 input offset voltage vs. temperature 0 1 -1 -2 -3 -4 max4137/8 toc-20 temperature ( c) voltage (mv) 53 52 51 54 44 -75 100 125 50 75 025 -50 -25 150 power supply current vs. temperature 49 50 48 47 46 45 max4137/8 toc-21 temperature ( c) current (ma) 3.0 2.3 -75 100 125 50 75 025 -50 -25 150 positive output voltage swing vs. temperature 2.8 2.9 2.7 2.6 2.5 2.4 max4137/8 toc-23 temperature ( c) voltage (v) -2.3 -3.0 -75 100 125 50 75 025 -50 -25 150 negative output voltage swing vs. temperature -2.5 -2.4 -2.6 -2.7 -2.8 -2.9 max4137/8 toc-24 temperature ( c) voltage (v) 0 -100 100k 1m 100m max4137 harmonic distortion vs. frequency (v o = 2vp-p, r l = 100 ? ) -70 -30 -20 -10 -40 -50 -60 -80 -90 max4137/8 toc-15 frequency (hz) harmonic distortion (dbc) 10m 2nd harmonic 3rd harmonic
detailed description the max4137/MAX4138 are 1-input/4-output video dis- tribution amplifiers. the max4137 is configured for a fixed gain of +2, while the MAX4138 features external gain control (feedback) for closed-loop gains of 2v/v or greater. each output provides sufficient current to drive five 150 ? loads. however, distortion will increase when driving multiple loads. the ttl/cmos-compatible digital control ( sel_ ) enables or disables each output amplifier. when the sel_ control input is low, the amplifier is enabled; when it is high, the amplifier is disabled and presents a high-impedance output. the enable/disable or disable/enable time is under 25ns, which is useful in multiplexing, pixel switching, or picture-in-picture applications. each device has an input amplifier, which buffers the input from any switching glitches that may be taking place at the output stage, and provides a high- impedance, low-capacitance input. the separate input buffer allows a true high output impedance when an amplifier is disabled. the outputs are protected against short circuits to ground. however, power-dissipation limits preclude shorting all output channels to ground. see the power- dissipation considerations section for details. max4137/MAX4138 1-input/4-output video distribution amplifiers _______________________________________________________________________________________ 7 pin description output 4 10 10 14 14 when low, enables output channel out3. when high, disables output channel out3. 15 15 analog ground 4, 9, 21 4, 9, 18, 21 output 2 5 5 negative supply for output amplifiers. connect to -5v. 6, 7 6, 7 output 3 8 8 output 1 3 3 positive supply for output amplifiers. connect to +5v. 2, 11 2, 11 function pin out4 sel4 sel3 agnd out2 veeo out3 out1 vcco name 16 16 vcci positive supply for input amplifier. connect to +5v. 17 rf output of input amplifier 18 rg inverting input 19 19 veei negative supply for input amplifier. connect to -5v. 20 20 in+ noninverting input 22 22 sel2 when low, enables output channel out2. when high, disables output channel out2. 23 23 sel1 when low, enables output channel out1. when high, disables output channel out1. max4137 MAX4138 when low, enables output channel out4. when high, disables output channel out4. no connect. not internally connected. 1, 12, 13, 24 1, 12, 13, 17, 24 n.c.
max4137/MAX4138 applications information grounding, bypassing, and pc board layout to obtain the max4137/MAX4138s?full 185mhz band- width, microstrip and stripline techniques are recom- mended in most cases. to ensure the pc board does not degrade the amplifier? performance, design the board for a frequency greater than 1ghz. even with very short traces, use these techniques at critical points, such as inputs and outputs. whether you use a constant-impedance board or not, observe the follow- ing guidelines when designing the board: ? do not use wire-wrap boards. they are too inductive. ? do not use ic sockets. they increase parasitic capacitance and inductance. ? in general, surface-mount components have shorter leads and lower parasitic reactance, giving better high-frequency performance than through-hole com- ponents. ? the pc board should have at least two layers, with one side a signal layer and the other a ground plane. ? keep signal lines as short and straight as possible. do not make 90 turns; round all corners. ? the ground plane should be as free from voids as possible. 1-input/4-output video distribution amplifiers 8 _______________________________________________________________________________________ n.c. 1 vcco 2 out1 3 out2 5 out3 8 gnd 9 out4 10 vcco 11 n.c. 12 out1 out2 out3 out4 max4137 sw1 sw2 sw3 sw4 gnd 4 agnd 21 in+ 20 veei 19 agnd 18 n.c. 17 vcci 16 sel3 15 sel4 14 n.c. 13 0.1 f 0.1 f 0.1 f 0.1 f 75 ? * 75 ? * 75 ? * 75 ? * 75 ? * 75 ? ? -5v dc +5v dc +5v dc veeo 6 veeo 7 0.1 f n.c. 24 sel1 23 sel2 22 -5v dc +5v dc video in * to terminate transmission line r f r g in figure 1. max4137 typical operating circuit
driving capacitive loads the max4137/MAX4138 provide maximum ac perfor- mance with no output load capacitance. this is the case when they are driving a correctly terminated trans- mission line (i.e., a back-terminated 75 ? cable). however, the max4137/MAX4138 are capable of driving capacitive loads up to 10pf without oscillations, but with reduced ac performance. driving large capacitive loads increases the chance of oscillations in most amplifier circuits. this is especially true for circuits with high loop gain, such as voltage fol- lowers. the amplifier? output resistance and the load capacitor combine to add a pole and excess phase to the loop response. if the frequency of this pole is low enough and phase margin is degraded sufficiently, oscillations may occur. a second problem when driving capacitive loads results from the amplifier? output impedance, which looks inductive at high frequencies. this inductance forms an l-c resonant circuit with the capacitive load, which causes peaking in the frequency response and degrades the amplifier? gain margin. the max4137/MAX4138 drive capacitive loads up to 10pf without oscillation. however, some peaking (in the frequency domain) or ringing (in the time domain) may occur (figure 3). max4137/MAX4138 1-input/4-output video distribution amplifiers _______________________________________________________________________________________ 9 figure 2. MAX4138 typical operating circuit n.c. 1 vcco 2 out1 3 out2 5 out3 8 agnd 9 out4 10 vcco 11 n.c. 12 out1 out2 out3 out4 MAX4138 sw1 sw2 sw3 sw4 agnd 4 agnd 21 in+ 20 veei 19 rg 18 rf 17 vcci 16 sel3 15 sel4 14 n.c. 13 0.1 f 0.1 f 0.1 f 0.1 f 75 ? * 75 ? * 75 ? * 75 ? * 75 ? * -5v dc +5v dc +5v dc veeo 6 veeo 7 0.1 f n.c. 24 sel1 23 sel2 22 -5v dc +5v dc video in r f r g in * to terminate transmission line
max4137/MAX4138 to drive larger-capacitance loads or to reduce ringing, add an isolation resistor between the amplifier? output and the load, as shown in figure 4. the value of r iso depends on the circuit? gain and the capacitive load. figure 5 shows the optional isolation resistor (r iso ) vs. capacitive load (c l ). at the higher capacitor values, the bandwidth is dominated by the rc network, formed by r iso and c l . power-dissipation considerations the max4137/MAX4138 can drive up to four outputs simultaneously. quiescent power dissipation is typically 520mw and 650mw maximum, respectively, with all channels enabled. the maximum package power dissi- pation is rated at 1540mw. in a typical application, four outputs drive a standard video signal into a 150 ? load. the amount of power added to the quiescent dissipation is minimal and no special precautions are necessary. however, each output driving the maximum 65ma into 30 ? will cause a power-dissipation increase of approxi- mately 200mw. therefore, you should not allow more than three outputs to deliver that load simultaneously. similarly, one output shorted to ground will cause a power-dissipation increase of 650mw. only one output can be shorted to ground without violating the package power rating. in conclusion, during normal operation in a matched- load environment, the total power dissipation is well within the package? dissipation rating. the maximum power dissipation is violated only if multiple channels are driving the maximum current into minimum loads at the same time. 1-input/4-output video distribution amplifiers 10 ______________________________________________________________________________________ figure 3. effect of c load on frequency response (without r iso ) 14 12 10 8 0.1m 1m 10m 100m 1g 0 6 4 2 frequency (hz) closed-loop gain (db) c l = 15pf c l = 10pf c l = 5pf max4137 MAX4138 v out v in r iso c l r l figure 4. capacitive-load driving circuit figure 5. optimal isolation resistor (r iso ) vs. c load 10 40 70 100 130 160 190 220 10 11 12 13 14 15 16 c load (pf) r isolation ( ? )
max4137/MAX4138 1-input/4-output video distribution amplifiers ______________________________________________________________________________________ 11 max4137 MAX4138 75 ? out1 out2 out3 out4 camera 1 subcarrier (sc1) in sc1m1 sc1m2 sel1 sel2 sel3 sel4 sc1m3 sc1m4 max4137 MAX4138 75 ? out1 out2 out3 out4 camera 2 subcarrier (sc2) in monitor inputs sc2m1 sc2m2 sel1 sel2 sel3 sel4 sc2m3 sc2m4 max4137 MAX4138 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? out1 out2 out3 out4 composite sync (from genlock) in m1 m2 sel1 sel2 sel3 sel4 m3 m4 video 75 ? monitor1 sync 75 ? video 75 ? monitor4 sync 75 ? video 75 ? monitor3 sync 75 ? video 75 ? monitor2 sync 75 ? figure 6. two cameras to four monitors distribution amplifier
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. 12 __________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 (408) 737-7600 1999 maxim integrated products printed usa is a registered trademark of maxim integrated products. max4137/MAX4138 1-input/4-output video distribution amplifiers ___________________chip information transistor count: 625 substrate connected to v ee ________________________________________________________package information dim a a1 b c e e h l min 0.093 0.004 0.014 0.009 0.291 0.394 0.016 max 0.104 0.012 0.019 0.013 0.299 0.419 0.050 min 2.35 0.10 0.35 0.23 7.40 10.00 0.40 max 2.65 0.30 0.49 0.32 7.60 10.65 1.27 inches millimeters 21-0042a wide so small-outline package (0.300 in.) dim d d d d d min 0.398 0.447 0.496 0.598 0.697 max 0.413 0.463 0.512 0.614 0.713 min 10.10 11.35 12.60 15.20 17.70 max 10.50 11.75 13.00 15.60 18.10 inches millimeters pins 16 18 20 24 28 1.27 0.050 l h e d e a a1 c 0 - 8 0.101mm 0.004in. b

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