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general description the max4310?ax4315 single-supply mux-amps com- bine high-speed operation, low-glitch switching, and excel- lent video specifications. the six products in this family are differentiated by the number of multiplexer inputs and the gain configuration. the max4310/max4311/max4312 inte- grate 2-/4-/8-channel multiplexers, respectively, with an adjustable gain amplifier optimized for unity-gain stability. the max4313/max4314/max4315 integrate 2-/4-/8-chan- nel multiplexers, respectively, with a +2v/v fixed-gain amplifier. all devices have 40ns channel switching time and low 10mvp-p switching transients, making them ideal for video-switching applications. they operate from a sin- gle +4v to +10.5v supply, or from dual supplies of ?v to ?.25v, and they feature rail-t o-rail outputs and an input common-mode voltage range that extends to the negative supply rail. the max4310/max4311/max4312 have a -3db bandwidth of 280mhz/345mhz/265mhz and up to a 460v/? slew rate. the max4313/max4314/max4315, with 150mhz/127mhz/ 97mhz -3db bandwidths up to a 540v/? slew rate, and a fixed gain of +2v/v, are ideally suited for driving back- terminated cables. quiescent supply current is as low as 6.1ma, while low-power shutdown mode reduces supply current to as low as 560? and places the outputs in a high-impedance state. the max4310?ax4315? internal amplifiers maintain an open-loop output impedance of only 8 over the full output voltage range, minimizing the gain error and bandwidth changes under loads typical of most rail-to-rail amplifiers. with differential gain and phase errors of 0.06% and 0.08? respectively, these devices are ideal for broadcast video applications. applications video signal multiplexing broadcast video video crosspoint switching medical imaging flash adc input buffers multimedia products 75 video cable drivers high-speed signal processing features ? single-supply operation down to +4v ? 345mhz -3db bandwidth (max4311) 150mhz -3db bandwidth (max4313) ? 540v/? slew rate (max4313) ? low 6.1ma quiescent supply current ? 40ns channel switching time ? ultra-low 10mvp-p switching transient ? 0.06%/0.08 differential gain/phase error ? rail-to-rail outputs: drives 150 to within 730mv of the rails ? input common-mode range includes negative rail ? low-power shutdown mode ? available in space-saving 8-pin ?ax and 16-pin qsop packages max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers ________________________________________________________________ maxim integrated products 1 19-1379; rev 1; 4/99 evaluation kit manual follows data sheet ordering information pin configurations and typical operating circuit appear at end of data sheet. rail-to-rail is a registered trademark of nippon motorola, ltd. for free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. for small orders, phone 1-800-835-8769. 16 narrow so 16 qsop -40? to +85? -40? to +85? max4315ese max4315 eee 14 narrow so 16 qsop -40? to +85? -40? to +85? max4314esd max4314 eee 8 so 8 ?ax -40? to +85? -40? to +85? max4313esa max4313 eua 16 narrow so 16 qsop -40? to +85? -40? to +85? max4312ese max4312 eee 14 narrow so 16 qsop -40? to +85? -40? to +85? max4311esd max4311 eee 8 so 8 ?ax pin-package temp. range -40? to +85? -40? to +85? max4310esa max4310 eua part 16-pin narrow so/qsop 14-pin narrow so, 16-pin qsop +2 8 max4315 +2 4 max4314 8-pin so/?ax 16-pin narrow so/qsop +2 2 max4313 3 +1 8 max4312 14-pin narrow so, 16-pin qsop 8-pin so/?ax pin-package 3 +1 3 +1 amplifier gain (v/v) part 4 max4311 2 max4310 no. of input channels selector guide
db max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (v cc = +5v, v ee = 0, shdn 3 4v, r l = , v out = 2.5v, 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. supply voltage (v cc to v ee ) ..................................................12v input voltage....................................(v ee - 0.3v) to (v cc + 0.3v) all other pins ...................................(v ee - 0.3v) to (v cc + 0.3v) output current................................................................?20ma short-circuit duration (v out to gnd, v cc or v ee ) ....continuous continuous power dissipation (t a = +70?) 8-pin so (derate 5.9mw/? above +70?)...................471mw 8-pin ?ax (derate 4.1mw/? above +70?) ..............330mw 14-pin so (derate 8.3mw/? above +70?).................667mw 16-pin so (derate 8.7mw/? above +70?).................696mw 16-pin qsop (derate 8.3mw/? above +70?)............667mw operating temperature range ...........................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10sec) .............................+300? max4310/max4311/max4312, inferred from cmrr test max4310/max4311/max4312, r l = 150 to gnd, 0.25v v out 4.2v inferred from psrr test max4313/max4314/max4315 max4310/max4311/max4312, open loop max4310/max4311/max4312 only i in_ max4310/max4311/ max4312 only 0 v cm 2.2v, max4310/max4311/max4312 only v in varied over v cm, max4310/max4311/ max4312 only conditions v/v 1.9 2.0 2.1 a vcl voltage gain db 50 59 a vol open-loop gain k 1 r out disabled output resistance 35 0.025 r out output resistance 8 k 70 r in differential input resistance m 3 r in common-mode input resistance v 0.035 v cc - 2.8 v 4.0 10.5 v cc operating supply voltage range input voltage range ? 0.1 2 i os input offset current ? 714 i b input bias current mv ? input offset voltage matching ?/? ? tc vos input offset voltage drift db 73 95 cmrr common-mode rejection ratio mv ?.0 ?0 v os input offset voltage units min typ max symbol parameter max4313/max4314/1max4315, inferred from output voltage swing 0.035 v cc - 2.7 open loop closed loop, a v = +1v/v max4313/max4314/max4315 0.025 max4313/max4314/max4315, r l = 150 to gnd, 0.25v v out 4.2v i fb , max4310/max4311/max4312 only 714 ? i fb feedback bias current
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers dc electrical characteristics (continued) (v cc = +5v, v ee = 0, shdn 3 4v, r l = , v out = 2.5v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) max4310/max4313 v cc = 4.0v to 10.5v r l = 30 ma 6.1 7.8 i cc quiescent supply current db 52 63 psrr power-supply rejection ratio ma ?5 95 i out output current shdn v il ? 560 750 shutdown supply current v ih 3 v cc - 1v v il v ee + 1v ? 0.3 5 i ih logic-high input current ? -500 -320 i il logic-low input current v v cc - 1 v ih logic-high threshold v cc - v oh v cc - v oh v ol - v ee v ol - v ee 0.25 0.4 0.04 0.07 r l = 150 0.73 0.9 0.03 0.06 ac electrical characteristics (v cc = +5v; v ee = 0; shdn 3 4v; r l = 150 ; v cm = 1.5v; a vcl = +1v/v (max4310/max4311/max4312), a vcl = +2v/v (max4313/max4314/max4315); t a = +25?; unless otherwise noted.) v v ee + 1 v il logic-low threshold _______________________________________________________________________________________ 3 -0.1db bandwidth bw (-0.1db) 40 mhz 60 max4310 max4311 v out = 100mvp-p 46 78 max4314 max4315 40 35 max4312 max4313 97 127 max4314 max4315 150 265 max4312 max4313 max4311 max4310 parameter symbol min typ max units -3db bandwidth bw (-3db) 345 mhz 280 conditions v out = 100mvp-p v out output voltage swing v r l = 10k conditions units min typ max symbol parameter max4311/max4314 6.9 8.8 max4312/max4315 7.4 9.4 logic characteristics ( shdn , a0, a1, a2)
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers 4 _______________________________________________________________________________________ ac electrical characteristics (continued) (v cc = +5v; v ee = 0; shdn 3 4v; r l = 150 ; v cm = 1.5v; a vcl = +1v/v (max4310/max4311/max4312), a vcl = +2v/v (max4313/max4314/max4315); t a = +25?; unless otherwise noted.) conditions conditions -85 110 90 min typ max symbol parameter v out = 2vp-p fpbw full-power bandwidth f = 1mhz, v out = 2vp-p dbc -76 second harmonic distortion max4313/max4314/max4315 -88 max4310/max4311/max4312 f = 1mhz, v out = 2vp-p dbc -95 third harmonic distortion max4313/max4314/max4315 -83 max4310/max4311/max4312 f = 1mhz, v out = 2vp-p db -76 thd total harmonic distortion v out = 2vp-p max4310/ max4311/ max4312 dbc -47 sfdr spurious-free dynamic range -95 -47 -72 -89 -80 max4310 max4311 100 max4312 max4313 mhz 40 80 max4314 max4315 70 max4313/max4314/max4315 0.03 r l = 150 to v cc /2 dg degrees % max4310/max4311/max4312 max4313/max4314/max4315 max4310/max4311/max4312 0.09 0.08 r l = 150 to v cc /2 a vcl = +1v/v, r l = 150 to v cc /2 dg differential gain error 0.06 max4310/max4311/max4312 max4313/max4314/max4315 25 v out = 2v step t s settling time to 0.1% ns 42 matching between channels over -3db bandwidth gain matching db 0.05 max4313/ max4314/ max4315 max4310/max4311/max4312 max4313/max4314/max4315 f = 3khz f = 2mhz f = 20mhz f = 3khz f = 2mhz f = 20mhz unit 460 430 v out = 2vp-p sr slew rate max4310 max4311 430 max4312 max4313 v/? 540 345 max4314 max4315 310 differential phase error a vcl = +1v/v, r l = 150 to v cc /2
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers _______________________________________________________________________________________ 5 f = 10mhz channel on or off f = 10mhz, v in = 2vp-p pf 2 c in input capacitance 3 z out output impedance db -95 all-hostile crossstalk conditions mvp-p 10 switching transient ns 50 t on enable time from shutdown ns 120 t off f = 10khz f = 10khz disable time to shutdown ns 40 t sw channel switching time nv/ hz 14 e n input voltage noise density pa/ hz 1.3 i n input current noise density units min typ max symbol parameter shdn = 0, f = 10mhz, v in = 2vp-p db -82 off-isolation -60 -52 switching characteristics max4310/max4313 max4311/max4314 max4312/max4315 typical operating characteristics (v cc = +5v; v ee = 0; shdn 3 4v; r l = 150 to v cc /2; v cm = 1.5v; a vcl = +1v/v (max4310/max4311/max4312), a vcl = +2v/v (max4313/max4314/max4315); t a = +25?; unless otherwise noted.) 4 -6 100k 10m 100m 1m 1g max4310 small-signal gain vs. frequency -4 max4310-01 frequency (hz) gain (db) -2 0 2 3 1 -1 -3 -5 v out = 100mvp-p 0.5 -0.5 100k 10m 100m 1m 1g max4310 gain flatness vs. frequency -0.3 max4310/15 toc02 frequency (hz) gain flatness (db) -0.1 0.1 0.3 0.4 0.2 0 -0.2 -0.4 v out = 100mvp-p 4 -6 100k 10m 100m 1m 1g max4310 large-signal gain vs. frequency -4 max4310/15-03 frequency (hz) gain (db) -2 0 2 3 1 -1 -3 -5 v out = 2vp-p ac electrical characteristics (continued) (v cc = +5v; v ee = 0; shdn 3 4v; r l = 150 ; v cm = 1.5v; a vcl = +1v/v (max4310/max4311/max4312), a vcl = +2v/v (max4313/max4314/max4315); t a = +25?; unless otherwise noted.)
-0.8 1 1000 100 10 max4311 gain flatness vs. frequency -0.4 -0.6 -0.7 0 -0.2 0.2 -0.3 -0.5 0.1 -0.1 max4310/15 toc05 frequency (mhz) gain flatness (db) v out = 100mvp-p -8 1 1000 100 10 max4311 small-signal gain vs. frequency -4 -6 -7 0 -2 2 -3 -5 1 -1 max4311 toc04 frequency (mhz) gain (db) v out = 100mvp-p -0.8 1 1000 100 10 max4312 gain flatness vs. frequency -0.4 -0.6 -0.7 0 -0.2 0.2 -0.3 -0.5 0.1 -0.1 max4310/15 toc08 frequency (mhz) gain flatness (db) v out = 100mvp-p -8 1 1000 100 10 max4312 small-signal gain vs. frequency -4 -6 -7 0 -2 2 -3 -5 1 -1 max4310/15 toc07 frequency (mhz) gain (db) v out = 100mvp-p -8 1 1000 100 10 max4311 large-signal gain vs. frequency -4 -6 -7 0 -2 2 -3 -5 1 -1 max4311 toc06 frequency (mhz) gain (db) v out = 2vp-p -8 1 1000 100 10 max4312 large-signal gain vs. frequency -4 -6 -7 0 -2 2 -3 -5 1 -1 max4310/15 toc09 frequency (mhz) gain (db) v out = 2vp-p 4 -6 100k 10m 100m 1m 1g max4313 small-signal gain vs. frequency -4 max4310/15-toc10 frequency (hz) gain (db) -2 0 2 3 1 -1 -3 -5 v out = 100mvp-p 0.5 -0.5 100k 10m 100m 1m 1g max4313 gain flatness vs. frequency -0.3 max4310/15-toc11 frequency (hz) gain flatness (db) -0.1 0.1 0.3 0.4 0.2 0 -0.2 -0.4 v out = 100mvp-p 4 -6 100k 10m 100m 1m 1g max4313 large-signal gain vs. frequency -4 max4310/15-toc12 frequency (hz) gain (db) -2 0 2 3 1 -1 -3 -5 v out = 2vp-p max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +5v; v ee = 0; shdn 3 4v; r l = 150 to v cc /2; v cm = 1.5v; a vcl = +1v/v (max4310/max4311/max4312), a vcl = +2v/v (max4313/max4314/max4315); t a = +25?; unless otherwise noted.)
-30 -100 100k 100m 10m 1m max4310/max4311/max4312 harmonic distortion vs. frequency -70 -90 -40 -60 -20 -80 -50 max4310/15 toc19 frequency (hz) harmonic distortion (dbc) v out = 2vp-p 2nd harmonic 3rd harmonic -30 -100 100k 100m 10m 1m max4313/max4314/max4315 harmonic distortion vs. frequency -70 -90 -40 -60 -20 -80 -50 max4310/15-20 frequency (hz) harmonic distortion (dbc) v out = 2vp-p 2nd harmonic 3rd harmonic 0 -100 100k 10m 100m 1m 1g power-supply rejection vs. frequency -80 max4310/15-21 frequency (hz) power-supply rejection (db) -60 -40 -20 -10 -30 -50 -70 -90 max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers _______________________________________________________________________________________ 7 -8 1 1000 100 10 max4314 small-signal gain vs. frequency -4 -6 -7 0 -2 2 -3 -5 1 -1 max4310/15 toc13 frequency (mhz) gain (db) v out = 100mvp-p -0.8 1 1000 100 10 max4314 gain flatness vs. frequency -0.4 -0.6 -0.7 0 -0.2 0.2 -0.3 -0.5 0.1 -0.1 max4310/15 toc14 frequency (mhz) gain flatness (db) v out = 100mvp-p -8 1 1000 100 10 max4314 large-signal gain vs. frequency -4 -6 -7 0 -2 2 -3 -5 1 -1 max4310/15 toc15 frequency (mhz) gain (db) v out = 2vp-p -8 1 1000 100 10 max4315 small-signal gain vs. frequency -4 -6 -7 0 -2 2 -3 -5 1 -1 max4310/15 toc16 frequency (mhz) gain (db) v out = 100mvp-p -0.8 1 1000 100 10 max4315 gain flatness vs. frequency -0.4 -0.6 -0.7 0 -0.2 0.2 -0.3 -0.5 0.1 -0.1 max4310/15 toc17 frequency (mhz) gain flatness (db) v out = 100mvp-p -8 1 1000 100 10 max4315 large-signal gain vs. frequency -4 -6 -7 0 -2 2 -3 -5 1 -1 max4310/15 toc18 frequency (mhz) gain (db) v out = 2vp-p typical operating characteristics (continued) (v cc = +5v; v ee = 0; shdn 3 4v; r l = 150 to v cc /2; v cm = 1.5v; a vcl = +1v/v (max4310/max4311/max4312), a vcl = +2v/v (max4313/max4314/max4315); t a = +25?; unless otherwise noted.)
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers 8 _______________________________________________________________________________________ 0 -100 10k 100k 10m 100m 1m 1g max4310/max4311/max4312 common-mode rejection vs. frequency -80 max4310/15-toc22 frequency (hz) common-mode rejection (db) -60 -40 -20 -10 -30 -50 -70 -90 -10 -110 100k 10m 100m 1m 1g off-isolation vs. frequency -90 max4310/15-toc23 frequency (hz) isolation (db) -70 -50 -30 -20 -40 -60 -80 -100 50 -150 0.1 10 100 1 1000 max4310/max4313 all-hostile crosstalk vs. frequency -110 max4310/15-toc24 frequency (mhz) crosstalk (db) -70 -30 10 30 -10 -50 -90 -130 0.1 10 1 100 1000 max4312/max4315 all-hostile crosstalk vs. frequency max4310/15 toc25 frequency (mhz) crosstalk (db) 50 30 10 -10 -150 -110 -130 -30 -50 -70 -90 100 10 10 10k 100k 1m 100 1k 10m voltage-noise density vs. frequency (input referred) max4310/15 toc28a frequency (hz) voltage-noise density (nv/ ? hz) 0.1 10 1 100 1000 max4311/max4314 all-hostile crosstalk vs. frequency max4310/15 toc26 frequency (mhz) crosstalk (db) 50 30 10 -10 -150 -110 -130 -30 -50 -70 -90 100 0.01 100k 10m 100m 1m 1g output impedance vs. frequency 0.1 max4310/15-toc27 frequency (hz) output impedance ( w ) 10 1 100 1 10 10k 100k 1m 100 1k 10m current-noise density vs. frequency (input referred) 10 max4310/15 toc29 frequency (hz) current-noise density (pa/ ? hz) in (1v/div) out (1v/div) max4310 large-signal pulse response max4310/15 toc30 10ns/div typical operating characteristics (continued) (v cc = +5v; v ee = 0; shdn 3 4v; r l = 150 to v cc /2; v cm = 1.5v; a vcl = +1v/v (max4310/max4311/max4312), a vcl = +2v/v (max4313/max4314/max4315); t a = +25?; unless otherwise noted.)
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers _______________________________________________________________________________________ 9 in (1v/div) out (1v/div) max4311 large-signal pulse response max4310/15-toc33 10ns/div max4312 large-signal pulse response max43110/15 toc32 10ns/div in (1v/div) out (1v/div) in (500mv/div) out (1v/div) max4313 large-signal pulse response max4310/15-toc33 10ns/div in (500mv/div) v out (1v/div) max4314 large-signal pulse response max4310/15-toc33 10ns/div max4311 small-signal pulse response max4310/15 toc37a 10ns/div in (50mv/div) out (50mv/div) max4315 large-signal pulse response max4310/15 toc35 10ns/div in (500mv/div) out (iv/div) in (50mv/div) out (50mv/div) max4310 small-signal pulse response max4310/15 toc36 10ns/div max4312 small-signal pulse response max4310/15 toc38 10ns/div in (50mv/div) out (50mv/div) in (50mv/div) out (50mv/div) max4313 small-signal pulse response max4310/15-toc39 10ns/div typical operating characteristics (continued) (v cc = +5v; v ee = 0; shdn 3 4v; r l = 150 to v cc /2; v cm = 1.5v; a vcl = +1v/v (max4310/max4311/max4312), a vcl = +2v/v (max4313/max4314/max4315); t a = +25?; unless otherwise noted.)
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers 10 ______________________________________________________________________________________ max4314 small-signal pulse response max4311 toc 10ns/div in (50mv/div) out (50mv/div) max4315 small-signal pulse response max4311 toc 10ns/div in (50mv/div) out (50mv/div) in (50mv/div) out (50mv/div) max4310 small-signal pulse response (c l = 10pf) max4310/15-toc42 10ns/div in (50mv/div) out (50mv/div) max4313 small-signal pulse response (c l = 22pf) max431015-toc45 10ns/div in (50mv/div) out (50mv/div) max4310 small-signal pulse response (c l = 22pf) max4310-toc22 10ns/div in (50mv/div) out (50mv/div) max4313 small-signal pulse response (c l = 10pf) max4310/15-toc44 10ns/div a0 (2.5v/div) out (10mv/div) channel-switching transient max4310/15 toc46 20ns/div shdn (2.0v/div) out (1v/div) shutdown response time max4310-toc27 100ns/div typical operating characteristics (continued) (v cc = +5v; v ee = 0; shdn 3 4v; r l = 150 to v cc /2; v cm = 1.5v; a vcl = +1v/v (max4310/max4311/max4312), a vcl = +2v/v (max4313/max4314/max4315); t a = +25?; unless otherwise noted.)
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers ______________________________________________________________________________________ 11 pin description 11 v ee 13 6 13 gnd 14 3, 6, 9 n.c. 3, 6, 8, 9, 11 out 16 8 fb 15 7 13 16 15 11 13 6 13 15 7 14 3, 6, 9 3, 6, 8, 9, 11 16 8 13 15 16 negative power supply. ground for single-supply operation. ground not connected. tie to ground plane for optimal performance. amplifier output amplifier feedback input name 1 a1 1 12 shdn 14 2 a2 4 5 in0 5 4 7 8 in2 10 in1 7 5 v cc 4 3 10 in4 in6 in5 in3 12 in7 function channel address logic input 1 shutdown input channel address logic input 2 amplifier input 0 amplifier input 2 amplifier input 1 positive power supply amplifier input 4 amplifier input 6 amplifier input 5 amplifier input 3 amplifier input 7 max4312 so/ qsop max4313 so/ ?ax max4315 so/ qsop qsop so a0 2 qsop 2 channel address logic input 0 2 14 1 5 7 6 4 9 11 10 8 12 3 2 1 2 3 so 1 1 12 14 2 4 5 5 4 7 8 10 7 5 4 3 10 12 max4310 so/ ?ax 1 2 14 1 5 7 6 4 9 11 10 8 12 max4311 max4314 pin
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers 12 ______________________________________________________________________________________ _______________detailed description the max4310/max4311/max4312 combine 2-channel, 4-channel, or 8-channel multiplexers, respectively, with an adjustable-gain output amplifier optimized for closed-loop gains of +1v/v (0db) or greater. the max4313/max4314/max4315 combine 2-channel, 4- channel, or 8-channel multiplexers, respectively, with a +2v/v (6db) fixed-gain amplifier, optimized for driving back-terminated cables. these devices operate from a single supply voltage of +4v to +10.5v, or from dual supplies of ?v to ?.25v. the outputs may be placed in a high-impedance state and the supply current mini- mized by forcing the shdn pin low. the input multi- plexers feature short 40ns channel-switching times and small 10mvp-p switching transients. the input capaci- tance remains constant at 1pf whether the channel is on or off, providing a predictable input impedance to the signal source. these devices feature single-supply, rail-to-rail, voltage-feedback output amplifiers that achieve up to 540v/? slew rates and up to 345mhz -3db bandwidths. these devices also feature excellent har- monic distortion and differential gain/phase perfor- mance. __________applications information rail-to-rail outputs, ground-sensing input the input common-mode range extends from the nega- tive supply rail to v cc - 2.7v with excellent common- mode rejection. beyond this range, multiplexer switching times may increase and the amplifier output is a nonlinear function of the input, but does not under- go phase reversal or latchup. the output swings to within 250mv of v cc and 40mv of v ee with a 10k load. with a 150 load to ground, the output swings from 30mv above v ee to within 730mv of the supply rail. local feedback around the output stage ensures low open-loop output impedance to reduce gain sensitivity to load variations. this feedback also produces demand-driven bias current to the output transistors for ?5ma drive capability while constrain- ing total supply current to only 6.1ma. feedback and gain resistor selection (max4310/max4311/max4312) select the max4310/max4311/max4312 gain-setting feedback (r f ) and input (r g ) resistors to fit your applica- tion. large resistor values increase voltage noise and interact with the amplifier? input and pc board capaci- tance. this can generate undesirable poles and zeros, and can decrease bandwidth or cause oscillations. for example, a noninverting gain of +2v/v configuration (r f = r g ) using 1k resistors, combined with 2pf of input capacitance and 1pf of pc board capacitance, causes a pole at 159mhz. since this pole is within the amplifier bandwidth, it jeopardizes stability. reducing the 1k resistors to 100 extends the pole frequency to 1.59ghz, but could limit output swing by adding 200 in parallel with the amplifier? load resistor. table 1 shows suggested r f and r g values for the max4310/max4311/max4312 when operating in the noninverting configuration (shown in figure 1). these values provide optimal ac response using surface- mount resistors and good layout techniques, as dis- cussed in the layout and power-supply bypassing section. stray capacitance at the fb pin causes feedback resis- tor decoupling and produces peaking in the frequency- response curve. keep the capacitance at fb as low as possible by using surface-mount resistors and by avoiding the use of a ground plane beneath or beside these resistors and the fb pin. some capacitance is unavoidable; if necessary, its effects can be neutralized by adjusting r f . use 1% resistors to maintain consis- tency over a wide range of production lots. max4310 r t 75 w 8 out 7 fb in0 in1 4 5 1 a0 r t 75 w r g r f 75 w cable r t 75 w r t 75 w 75 w cable 75 w cable figure 1. max4310 noninverting gain configuration table 1. bandwidth and gain with suggested gain-setting resistors (max4310/max4311/max4312) gain (v/v) gain (db) r f ( ) r g ( ) -3db bw (mhz) 0.1db bw (mhz) 80 280 500 500 0 6 0 1 2 5 14 500 120 4 20 2 10 56 500 20 10 30 60
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers ______________________________________________________________________________________ 13 low-power shutdown mode all parts feature a low-power shutdown mode that is activated by driving the shdn input low. placing the amplifier in shutdown mode reduces the quiescent sup- ply current to 560? and places the output into a high- impedance state, typically 35k . by tying the outputs of several devices together and disabling all but one of the paralleled amplifiers?outputs, multiple devices may be paralleled to construct larger switch matrices. for max4310/max4311/max4312 application circuits operating with a closed-loop gain of +2v/v or greater, consider the external-feedback network impedance of all devices used in the mux application when calculat- ing the total load on the output amplifier of the active device. the max4313/max4314/max4315 have a fixed gain of +2v/v that is internally set with two 500 thin- film resistors. the impedance of the internal feedback resistors must be taken into account when operating multiple max4313/max4314/max4315s in large multi- plexer applications. for normal operation, drive shdn high. if the shutdown function is not used, connect shdn to v cc . layout and power-supply bypassing the max4310?ax4315 have very high bandwidths and consequently require careful board layout, includ- ing the possible use of constant-impedance microstrip or stripline techniques. to realize the full ac performance of these high-speed amplifiers, pay careful attention to power-supply bypassing and board layout. the pc board should have at least two layers: a signal and power layer on one side, and a large, low-impedance ground plane on the other side. the ground plane should be as free of voids as possible, with one exception: the feedback (fb) should have as low a capacitance to ground as possible. therefore, layers that do not incorporate a signal or power trace should not have a ground plane. whether or not a constant-impedance board is used, it is best to observe the following guidelines when designing the board: 1) do not use wire-wrapped boards (they are too inductive) or breadboards (they are too capacitive). 2) do not use ic sockets; they increase parasitic capacitance and inductance. 3) keep signal lines as short and straight as possible. do not make 90 turns; round all corners. 4) observe high-frequency bypassing techniques to maintain the amplifier? accuracy and stability. 5) use surface-mount components. they generally have shorter bodies and lower parasitic reactance, yielding better high-frequency performance than through-hole components. out in- shdn, a0, a1, a2 in+ 10k logic input max431_ figure 3. circuit to reduce logic-low input current 0 -10 0 50 100 150 300 350 500 -7 -8 -1 logic-low threshold (mv above v ee ) input current ( m a) 200 250 400 450 -3 -5 -9 -2 -4 -6 figure 4. logic-low input current vs. v il with 10k series resistor 20 -160 0 50 100 150 300 350 500 -100 -120 0 logic-low threshold (mv above v ee ) input current ( m a) 200 250 400 450 -60 -140 -20 -40 -80 figure 2. logic-low input current vs. v il ( shdn , a0, a1, a2)
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers 14 ______________________________________________________________________________________ the bypass capacitors should include a 100nf, ceram- ic surface-mount capacitor between each supply pin and the ground plane, located as close to the package as possible. optionally, place a 10? tantalum capaci- tor at the power-supply pins?point of entry to the pc board to ensure the integrity of incoming supplies. the power-supply trace should lead directly from the tanta- lum capacitor to the v cc and v ee pins. to minimize parasitic inductance, keep pc traces short and use sur- face-mount components. if input termination resistors and output back-termination resistors are used, they should be surface-mount types, and should be placed as close to the ic pins as possible. video line driver the max4310?ax4315 are well-suited to drive coaxial transmission lines when the cable is terminated at both ends, as shown in figure 5. cable frequency response can cause variations in the signal? flatness. max4313 r t 75 w 8 out in0 in1 4 5 17 gnd a0 r t 75 w 500 w 500 w 75 w cable out r t 75 w r t 75 w 75 w cable 75 w cable figure 5. video line driver 100m 1g -6 4 3 2 0 -1 -2 -3 -4 -5 1 100k 1m 10m max4310-fig06 frequency (hz) gain (db) v out = 100mvp-p 10pf load 5pf load 15pf load figure 6. small-signal gain vs. frequency with capacitive load and no isolation resistor max4313 r iso 8 out in0 in1 4 5 17 gnd a0 r l c l 500 w 500 w r t 75 w r t 75 w 75 w cable 75 w cable figure 7. using an isolation resistor (r iso ) for high capacitive loads 10 15 20 25 30 0 50 100 150 200 250 max4310-fig08 capacitive load (pf) isolation resistance r iso ( w ) figure 8. optimal isolation resistance vs. capacitive load 100m 1g -6 4 3 2 0 -1 -2 -3 -4 -5 1 100k 1m 10m max4310-fig09 frequency (hz) gain (db) v out = 100mvp-p 47pf load 90pf load 120pf load figure 9. small-signal gain vs. frequency with load capacitance and 27 isolation resistor
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers ______________________________________________________________________________________ 15 driving capacitive loads a correctly terminated transmission line is purely resis- tive and presents no capacitive load to the amplifier. reactive loads decrease phase margin and may pro- duce excessive ringing and oscillation (see typical operating characteristics ). another concern when driving capacitive loads origi- nates from the amplifier? output impedance, which appears 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? phase margin. although the max4310?ax4315 are optimized for ac performance and are not designed to drive highly capaci- tive loads, they are capable of driving up to 20pf without oscillations. however, some peaking may occur in the fre- quency domain (figure 6). to drive larger capacitive loads or to reduce ringing, add an isolation resistor between the amplifier? output and the load (figure 7). the value of r iso depends on the circuit? gain and the capacitive load (figure 8). figure 9 shows the max4310?ax4315 frequency response with the isola- tion resistor and a capacitive load. with higher capaci- tive values, bandwidth is dominated by the rc network formed by r iso and c l ; the bandwidth of the amplifier itself is much higher. also note that the isolation resistor forms a divider that decreases the voltage delivered to the load. figure 10. high-speed ev board layout?omponent side figure 11. high-speed ev board layout?older side 1 0 1 0 0 1 channel selected a2 shdn 1 0 3 2 0 1 0 0 a1 1 1 0 x none, high-z output x 1 1 4 1 1 6 5 1 1 0 1 0 1 1 7 1 1 0 a0 1 0 x 0 0 1 1 1 1 0 1 channel selected a2 shdn 1 3 2 1 a1 1 1 0 none, high-z output 1 0 a0 1 0 x 1 1 0 1 channel selected a2 shdn 0 0 a1 0 none, high-z output x 1 0 a0 x max4310/max4313 max4311/max4314 max4312/max4315 table 2. input control logic
max4310?ax4315 digital interface the multiplexer architecture of the max4310?ax4315 ensures that no two input channels are ever connected together. channel selection is accomplished by apply- ing a binary code to channel address inputs. the address decoder selects input channels, as shown in table 2. all digital inputs are cmos compatible. high-speed evaluation board figures 10 and 11 show the evaluation board and pre- sent a suggested layout for the circuits. this board was developed using the techniques described in the layout and power-supply bypassing section of this data sheet. the smallest available surface-mount resis- tors were used for feedback and back-termination to minimize their distance from the part, reducing the capacitance associated with longer lead lengths. sma connectors were used for best high-frequency performance. inputs and outputs do not match a 75 line, but this does not affect performance since dis- tances are extremely short. however, in applications that require lead lengths greater than one-quarter of the wavelength of the highest frequency of interest, use constant-impedance traces. fully assembled evaluation boards are available for the max4313 in an so package. high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers 16 ______________________________________________________________________________________ max4313 0.1 m f 75 w 8 out 3 v cc +4v to +10.5v in1 in0 5 4 1627 a0 75 w 500 w gnd v ee shdn 500 w video output 75 w cable typical operating circuit chip information transistor count: 156
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers ______________________________________________________________________________________ 17 top view n.c. = not internally connected. tie to ground plane for optimal performance. a2 a1 a0 n.c. v cc in0 in1 n.c. 500 w max4314 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 mux qsop out gnd shdn v ee in3 n.c. in2 n.c. 500 w out gnd shdn v ee v cc n.c. a0 a1 max4314 in3 n.c. in2 in1 n.c. in0 so 500 w 14 13 12 11 10 9 8 1 2 3 4 5 6 7 mux 500 w max4313 v ee in1 in0 out gnd shdn v cc a0 so/ m max 500 w 8 7 6 5 1 2 3 4 mux 500 w max4315 so/qsop 500 w 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 a2 mux a1 a0 in1 v cc in0 in2 in3 out gnd shdn v ee in7 in6 in5 in4 500 w max4312 so/qsop 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 a2 mux a1 a0 in1 v cc in0 in2 in3 out fb shdn v ee in7 in6 in5 in4 max4311 qsop 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 a1 mux a0 n.c. n.c. v cc in0 in1 n.c. out fb shdn v ee in3 n.c. in2 n.c. max4311 so 14 13 12 11 10 9 8 1 2 3 4 5 6 7 a1 mux a0 n.c. n.c. v cc in0 in1 out fb shdn v ee in3 n.c. in2 max4310 v ee in1 in0 1 2 8 7 out fb shdn v cc a0 so/ m max 3 4 6 5 - + mux pin configurations
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers 18 ______________________________________________________________________________________ 8lumaxd.eps package information
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers ______________________________________________________________________________________ 19 package information (continued) qsop.eps
max4310?ax4315 high-speed, low-power, single-supply, multichannel, video multiplexer-amplifiers package information (continued) soicn.eps 20 ______________________________________________________________________________________

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