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general description the max4310?ax4315 single-supply mux-amps com-bine high-speed operation, low-glitch switching, and excellent video specifications. the six products in this family are differentiated by the number of multiplexer inputs and the gain configuration. the max4310/ max4311/max4312 integrate 2-/4-/8-channel multiplex- ers, respectively, with an adjustable gain amplifier opti- mized for unity-gain stability. the max4313/max4314/ max4315 integrate 2-/4-/8-channel multiplexers, respec - tively, with a +2v/v fixed-gain amplifier. all devices have40ns channel switching time and low 10mvp-p switching transients, making them ideal for video-switching applica - tions. they operate from a single +4v to +10.5v supply, or from dual supplies of ?v to 5.25v, and they feature rail-to-rail outputs and an input common-mode voltage range that extends to the negative supply rail. the max4310/max4311/max4312 have a -3db band- width of 280mhz/345mhz/265mhz and up to a 460v/ s slew rate. the max4313/max4314/max4315, with150mhz/127mhz/97mhz -3db bandwidths up to a 540v/ s slew rate, and a fixed gain of +2v/v, are ideally suited for driving back-terminated cables. quiescent sup - ply current is as low as 6.1ma, while low-power shutdownmode reduces supply current to as low as 560 a and places the outputs in a high-impedance state. themax4310?ax4315? internal amplifiers maintain an open-loop output impedance of only 8 over the full out- put voltage range, minimizing the gain error and band - width changes under loads typical of most rail-to-railamplifiers. with differential gain and phase errors of 0.06% and 0.08 , respectively, these devices are ideal for broadcast video applications. ________________________applications 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 3; 3/08 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. evaluation kit manual available ordering information selector guide pin configurations and typical operating circuit appear atend of data sheet. ?ax is a registered trademark of maxim integrated products, inc. part no. of input channels amplifier gain (v/v) pin-package max4310 2 + 1 8-pin so/?ax max4311 4 + 1 14-pin narrow so, 16-pin qsop max4312 8 + 1 16-pin narrow so/qsop max4313 2 +2 8-pin so/?ax max4314 4 +2 14-pin narrow so, 16-pin qsop max4315 8 +2 16-pin narrow so/qsop part temp range pin-package max4310 eua -40 c to +85 c 8 ?ax max4310esa -40 c to +85 c 8 so max4311 eee -40 c to +85 c 16 qsop max4311esd -40 c to +85 c 14 narrow so max4312 eee -40 c to +85 c 16 qsop max4312ese -40 c to +85 c 16 narrow so max4313 eua -40 c to +85 c 8 ?ax max4313esa -40 c to +85 c 8 so max4314 eee -40 c to +85 c 16 qsop max4314esd -40 c to +85 c 14 narrow so max4315 eee -40 c to +85 c 16 qsop max4315ese -40 c to +85 c 16 narrow so video signal multiplexing video crosspoint switching flash adc input buffers 75 video cable drivers high-speed signal processing broadcast videomedical imaging multimedia products downloaded from: http:///
max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers 2 _______________________________________________________________________________________ absolute maximum ratingsdc electrical characteristics (v cc = +5v, v ee = 0v, shdn 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 ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications 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) a ll other pins ...................................(v ee - 0.3v) to (v cc + 0.3v) output current................................................................?20mashort-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?).................667mw16-pin so (derate 8.7mw/? above +70?).................696mw 1 6-pin qsop (derate 8.3mw/? above +70?)............667mw operating temperature range ...........................-40? to +85?storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units operating supply voltagerange v cc inferred from psrr test 4.0 10.5 v max4310/max4311/max4312, inferred fromcmrr test 0.035 v cc - 2.8 input voltage range max4313/max4314/max4315, inferred fromoutput voltage swing 0.035 v cc - 2.7 v common-mode rejectionratio cmrr 0 v cm 2.2v, max4310/max4311/max4312 only 73 95 db input offset voltage v os 5.0 ?0 mv input offset voltage drift tc vos ? ?/? input offset voltagematching ? mv input bias current i b i in 7 14 ? feedback bias current i fb i fb , max4310/max4311/max4312 only 7 14 a input offset current i os max4310/max4311/max4312 only 0.1 2 a common-mode inputresistance r in v in varied over v cm , max4310/max4311/ max4312 only 3 m differential input resistance r in 70 k open loop 8 max4310/max4311/max4312 only closed loop, a v = +1v/v 0.025 output resistance r out max4313/max4314/max4315 0.025 max4310/max4311/max4312, open loop 35 disabled output resistance r out max4313/max4314/max4315 1 open-loop gain a vol max4310/max4311/max4312,r l = 150 to gnd, 0.25v v out 4.2v 50 59 db voltage gain a vcl max4313/max4314/max4315,r l = 150 to gnd, 0.25v v out 4.2v 1.9 2.0 2.1 v/v downloaded from: http:///
max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers _______________________________________________________________________________________ 3 dc electrical characteristics (continued)(v cc = +5v, v ee = 0v, shdn 4v, r l = , v out = 2.5v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) parameter symbol conditions min typ max units v cc - v oh 0.73 0.9 r l = 150 v ol - v ee 0 .03 0 .06 v cc - v oh 0.25 0.4 o utput voltage swing v out r l = 10k v ol - v ee 0.04 0.07 v output current i out r l = 30 ?5 ?5 ma power-supply rejectionratio psrr v cc = 4.0v to 10.5v 52 63 db max4310/max4313 6.1 7.8 max4311/max4314 6.9 8.8 quiescent supply current i cc max4312/max4315 7.4 9.4 ma shutdown supply current shdn v il 560 750 ? logic characteristics ( shdn , a0, a1, a2) logic-low threshold v il v ee + 1 v logic-high threshold v ih v cc - 1 v logic-low input current i il v il v ee + 1v -500 -320 ? logic-high input current i ih v ih v cc - 1v 0.3 5 ? ac electrical characteristics(v cc = +5v, v ee = 0v, shdn 4v, r l = 150 , v cm = 1.5v, a vcl = +1v/v (max4310/max4311/max4312), a vcl = +2v/v (max4313/max4314/max4315), t a = +25c, unless otherwise noted.) parameter symbol conditions min typ max units max4310 280 max4311 345 max4312 265 max4313 150 max4314 127 -3db bandwidth bw (-3db) v out = 100mvp-p max4315 97 mhz max4310 60 max4311 40 max4312 35 max4313 40 max4314 78 -0.1db bandwidth bw (-0.1db) v out = 100mvp-p max4315 46 mhz downloaded from: http:///
max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers 4 _______________________________________________________________________________________ ac electrical characteristics (continued)(v cc = +5v, v ee = 0v, shdn 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.) p arameter s ymbol c onditions min typ max units max4310 110 max4311 100 m ax4312 80 m ax4313 40 max4314 90 full-power bandwidth fpbw v out = 2vp-p max4315 70 mhz max4310 460 max4311 430 max4312 345 max4313 540 max4314 430 slew rate sr v out = 2vp-p max4315 310 m ax 4310/m ax 4311/m ax 4312 42 settling time to 0.1% t s v out = 2vp-p m ax4313/m ax4314/m ax4315 25 ns gain matching matching between channels over -3dbbandwidth 0.05 db a vcl = +1v/v, r l = 150 to v cc /2 max4310/max4311/max4312 0.06 differential gain error dg r l = 150 to v cc /2 max4313/max4314/max4315 0.09 % a vcl = +1v/v, r l = 150 to v cc /2 max4310/max4311/max4312 0.08 differential phase error dg r l = 150 to v cc /2 max4313/max4314/max4315 0.03 degrees f = 3khz -89 f = 2khz -80 max4310/ max4311/ max4312 f = 20khz -47 f = 3khz -95 f = 2khz -72 spurious-free dynamicrange sfdr v out = 2vp-p max4313/ max4314/ max4315 f = 20khz -47 dbc m ax4310/m ax4311/m ax4312 -85 second harmonic distortion f = 1mhz, v out = 2vp-p m ax4313/m ax4314/m ax4315 -76 dbc m ax4310/m ax4311/m ax4312 -88 third harmonic distortion f = 1mhz, v out = 2vp-p m ax4313/m ax4314/m ax4315 -95 dbc m ax4310/m ax4311/m ax4312 -83 total harmonic distortion thd f = 1mhz, v out = 2vp-p m ax4313/m ax4314/m ax4315 -76 dbc downloaded from: http:///
max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers _______________________________________________________________________________________ 5 ac electrical characteristics (continued)(v cc = +5v, v ee = 0v, shdn 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.) parameter symbol conditions min typ max units max4310/max4313 -95 max4311/max4314 -60 a ll-hostile crosstalk f = 10mhz, v in = 2vp-p m ax4312max4315 -52 db o ff-isolation shdn = 0, f = 10mhz, v in = 2vp-p -82 db output impedance z out f = 10mhz 3 input capacitance c in channel on or off 2 pf input voltage-noise density e n f = 10khz 14 nv/ hz input current-noise density i n f = 10khz 1.3 pa/ hz switching characteristics channel switching time t sw 40 ns enable time from shutdown t on 50 ns disable time to shutdown t off 120 ns switching transient 10 mvp-p typical operating characteristics (v cc = +5v, v ee = 0v, shdn 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 = +25c, unless otherwise noted.) 4 -6 100k 10m 100m 1 m1 g max4310 small-signal gain vs. frequency -4 max4310-01 frequency (hz) gain (db) -2 0 2 31 -1-3 -5 v out = 100mvp-p 0.5 -0.5 100k 10m 100m 1 m1 g max4310 gain flatness vs. frequency -0.3 max4310/15 toc02 frequency (hz) gain flatness (db) -0.1 0.1 0.3 0.40.2 0 -0.2-0.4 v out = 100mvp-p 4 -6 100k 10m 100m 1 m1 g max4310 large-signal gain vs. frequency -4 max4310/15-03 frequency (hz) gain (db) -2 0 2 31 -1-3 -5 v out = 2vp-p downloaded from: http:///
max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +5v, v ee = 0v, shdn 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.) -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 1 m1 g max4313 small-signal gain vs. frequency -4 max4310/15-toc10 frequency (hz) gain (db) -2 0 2 31 -1-3 -5 v out = 100mvp-p 0.5 -0.5 100k 10m 100m 1 m1 g max4313 gain flatness vs. frequency -0.3 max4310/15-toc11 frequency (hz) gain flatness (db) -0.1 0.1 0.3 0.40.2 0 -0.2-0.4 v out = 100mvp-p 4 -6 100k 10m 100m 1 m1 g max4313 large-signal gain vs. frequency -4 max4310/15-toc12 frequency (hz) gain (db) -2 0 2 31 -1-3 -5 v out = 2vp-p downloaded from: http:///
max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers _______________________________________________________________________________________ 7 typical operating characteristics (continued) (v cc = +5v, v ee = 0v, shdn 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 1 m1 g power-supply rejection vs. frequency -80 max4310/15-21 frequency (hz) power-supply rejection (db) -60 -40 -20 -10-30 -50 -70 -90 -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 downloaded from: http:///
max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers 8 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +5v, v ee = 0v, shdn 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.) 0 -100 10k 100k 10m 100m 1 m1 g 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 0 100k 10m 100m 1 m1 g off-isolation vs. frequency -100 -120 max4310/15-toc23 frequency (hz) isolation (db) -20 -40-60 -80 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) 5030 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) 5030 10 -10 -150 -110-130 -30-50 -70 -90 100 0.01 100k 10m 100m 1 m1 g output impedance vs. frequency 0.1 max4310/15-toc27 frequency (hz) output impedance ( ) 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 max4312max4315 max4311max4314 max4310max4313 downloaded from: http:///
max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers _______________________________________________________________________________________ 9 typical operating characteristics (continued) (v cc = +5v, v ee = 0v, shdn 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.) 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 downloaded from: http:///
max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers 10 ______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +5v, v ee = 0v, shdn 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.) 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 downloaded from: http:///
max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers ______________________________________________________________________________________ 11 pin description pin m ax4311 m ax4314 max4310 so/?ax so qsop max4312 so/qsop max4313 so/max so qsop max4315 so/qsop name f unction 1 2 2 3 1 2 2 3 a0 channel address logic input 0 1 1 2 1 1 2 a1 channel address logic input 1 ? 1 a2 channel address logic input 2 2 12 14 14 2 12 14 14 shdn shutdown input 3 4 44 344 4v cc positive power supply 4 5 5 5 4 5 5 5 in0 amplifier input 0 5 7 7 6 5 7 7 6 in1 amplifier input 1 8 10 7 8 10 7 in2 amplifier input 2 10 12 8 10 12 8 in3 amplifier input 3 ? 9 in4 amplifier input 4 ? 0 10 in5 amplifier input 5 ? 1 11 in6 amplifier input 6 ? 2 12 in7 amplifier input 7 6 11 13 13 6 11 13 13 v ee negative power supply. groundfor single-supply operation. 7 13 15 15 fb amplifier feedback input 7 13 15 15 gnd ground 8 14 16 16 8 14 16 16 out amplifier output 3, 6, 9 3, 6, 8, 9, 11 3, 6, 9 3, 6, 8, 9, 11 n.c. not connected. tie to groundplane for optimal performance. downloaded from: http:///
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 harmonic 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, multiplexerswitching 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 stageensures 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-settingfeedback (r f ) and input (r g ) resistors to fit your applica- tion. large resistor values increase voltage noise andinteract 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 apole 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 rf and rg values for the max4310/max4311/max4312 when operating in the non- inverting configuration (shown in figure 1). these values provide optimal ac response using surface-mount resis- tors and good layout techniques, as discussed 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 rf. use 1% resistors to maintain consis - tency over a wide range of production lots. max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers 12 ______________________________________________________________________________________ max4310 r t 75 8out 7fb in0in1 45 1 a0 r t 75 r g r f 75 cable r t 75 r t 75 75 cable 75 cable gain (v/v) gain (d b) r f ( ) r g ( ) - 3db bw (m hz) 0.1db bw (m hz) 100 280 60 2 6 500 500 80 30 5 14 500 120 20 4 10 20 500 56 10 2 figure 1. max4310 noninverting gain configuration table 1. bandwidth and gain withsuggested gain-setting resistors (max4310/max4311/max4312) downloaded from: http:///
low-power shutdown mode all parts feature a low-power shutdown mode that isactivated 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 ofthe paralleled amplifiers?outputs, multiple devices may be paralleled to construct larger switch matrices. for max4310/max4311/max4312 application circuitsoperating 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 feedbackresistors 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, connectshdn to v cc . layout and power-supply bypassing the max4310?ax4315 have very high bandwidths andconsequently require careful board layout, including 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 bypass- ing 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 nothave 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. max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers ______________________________________________________________________________________ 13 20 -160 0 50 100 150 300 350 500 -100-120 0 logic-low threshold (mv above v ee ) input current ( a) 200 250 400 450 -60 -140 -20-40 -80 figure 2. logic-low input current vs. v il ( shdn , a0, a1, a2) 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 ( a) 200 250 400 450 -3-5 -9 -2-4 -6 figure 4. logic-low input current vs. v il with 10k series resistor downloaded from: http:///
max4310?ax4315 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 pin? 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. high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers 14 ______________________________________________________________________________________ max4313 r t 75 8out in0in1 45 17 gnd a0 r t 75 500 500 75 cable out r t 75 r t 75 75 cable 75 cable figure 5. video line driver 10 15 20 25 30 0 50 100 150 200 250 max4310-fig08 capacitive load (pf) isolation resistance r iso ( ) figure 8. optimal isolation resistance vs. capacitive load 100m 1g -6 43 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 a capacitiveload and no-isolation resistor max4313 r iso 8out in0in1 45 17 gnd a0 r l c l 500 500 r t 75 r t 75 75 cable 75 cable figure 7. using an isolation resistor (r iso ) for high-capacitive loads 100m 1g -6 43 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 a capacitiveload and 27 no-isolation resistor downloaded from: http:///
video line driver the max4310?ax4315 are well-suited to drive coaxialtransmission lines when the cable is terminated at both ends, as shown in figure 5. cable frequency response can cause variations in the signal? flatness. 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, whichappears 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 capacitiveloads or to reduce ringing, add an isolation resistor between the amplifier? output and the load (figure 7). the value of riso 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 resistorforms a divider that decreases the voltage delivered to the load. max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers ______________________________________________________________________________________ 15 max4310/max4313 ss ss hh hh dd dd nn nn a2 a1 a0 c hannel selected 0 x none, high-z output 1 00 1 11 max4311/max4314 ss ss hh hh dd dd nn nn a2 a1 a0 c hannel selected 0 x x none, high-z output 1 00 0 1 01 1 1 10 2 1 11 3 max4312/max4315 ss ss hh hh dd dd nn nn a2 a1 a0 channel selected 0 x x x none, high-z output 1000 0 1001 1 1010 2 1011 3 1100 4 1101 5 1110 6 1111 7 figure 10. high-speed ev board layout?omponent side table 2. input control logic figure 11. high-speed ev board layout?older side downloaded from: http:///
max4310?ax4315 digital interface the multiplexer architecture of the max4310?ax4315 ensures that no two input channels are ever connectedtogether. 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. the smallest available surface-mount resistors were used for feedback and back-termination to minimize their dis-tance from the part, reducing the capacitance associat- ed 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 pack- age. high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers 16 ______________________________________________________________________________________ max4313 0.1 f 75 8out 3 v cc +4v to +10.5v in1in0 54 1627 a0 75 500 gnd v ee shdn 500 video output 75 cable typical operating circuit chip information transistor count: 156 package information for the latest package outline information, go to www.maxim-ic.com/packages . package type package code document no. 8 so s8-4 21-0041 8 ?ax u8-1 21-0036 14 narrow so s14-1 21-0041 16 narrow so s16-1 21-0041 16 qsop e16-1 21-0055 downloaded from: http:///
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. a1a0 n.c. n.c. v cc in0in1 n.c. 500 max4314 1615 14 13 12 11 10 9 12 34 5 6 7 8 mux qsop outgnd shdn v ee in3n.c. in2 n.c. 500 outgnd shdn v ee v cc n.c. a0 a1 max4314 in3 n.c. in2 in1 n.c. in0 so 500 1413 12 11 10 98 12 34 5 6 7 mux 500 max4313 v ee in1 in0 out gnd shdn v cc a0 so/ max 500 87 6 5 12 34 mux 500 max4315 so/qsop 500 1615 14 13 12 11 10 9 12 34 5 6 7 8 a2 mux a1a0 in1 v cc in0in2 in3 outgnd shdn v ee in7in6 in5 in4 500 max4312 so/qsop 1615 14 13 12 11 10 9 12 34 5 6 7 8 a2 mux a1a0 in1 v cc in0in2 in3 outfb shdn v ee in7in6 in5 in4 max4311 qsop 1615 14 13 12 11 10 9 12 34 5 6 7 8 a1 mux a0 n.c.n.c. v cc in0in1 n.c. outfb shdn v ee in3n.c. in2 n.c. max4311 so 1413 12 11 10 98 12 34 5 6 7 a1 mux a0 n.c.n.c. v cc in0in1 outfb shdn v ee in3n.c. in2 max4310 v ee in1 in0 12 8 7 out fb shdn v cc a0 so/ max 3 4 6 5 - + mux pin configurations downloaded from: http:///
max4310?ax4315 high-speed, low-power, single-supply multichannel, video multiplexer-amplifiers maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses areimplied. maxim reserves the right to change the circuitry and specifications without notice at any time. 18 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2008 maxim integrated products is a registered trademark of maxim integrated products, inc. revision history revision number revision date d escription p ages changed 0 7/98 initial release 1 4/99 added new parts to data sheet. 1?0 2 12/02 corrected max4314 pin configuration. 17 3 3/08 updated typical operating characteristics .8 downloaded from: http:///

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