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_______________________________________________________________ maxim integrated products 1 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 19-5569; rev 1; 2/11 note: all devices are specified over the -40 c to +125 c operating temperature range. * ep = exposed pad. ordering information typical operating circuit general description the max9626/max9627/max9628 are low-noise, low- distortion, and high-bandwidth differential amplifier/adc drivers for use in applications from dc to 1.35ghz. the exceptional low input-referred noise and low distortion make these parts an excellent solution to drive high-speed 12-bit to 16-bit pipeline adcs. the output common mode is set through the vocm input pin, thus eliminating the need for a coupling transformer or ac-coupling capacitors. the ics feature shutdown mode for power savings and are offered in a 12-pin, 3mm x 3mm tqfn package for operation over a -40 n c to +125 n c temperature range. applications communication medical imaging ate high-performance instrumentation features s low-voltage noise density 3.6nv/ hz s low harmonic distortion hd2/hd3 of -102/-105db at 10mhz hd2/hd3 of -86/-80db at 125mhz s factory set gain options: 1v/v, 2v/v, 4v/v s 1.35ghz small-signal bandwidth s adjustable output common-mode voltage s differential-to-differential or single-ended-to- differential operation s 25a shutdown current s +2.85v to +5.25v single-supply voltage s small, 3mm x 3mm 12-pin tqfn package evaluation kit available v cc r f max19588 pipeline adc vref driving the max19588 high-speed pipeline adc single-ended input rt- in- in+ r f r t r t r s r g r g r s v cc v ee out+ out- vocm shdnb rt+ max9626 max9627 max9628 part gain (db) pin-package top mark max9626 atc+ 1 12 tqfn-ep* +abs max9627 atc+ 2 12 tqfn-ep* +abt max9628 atc+ 4 12 tqfn-ep* +abu
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 2 stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation 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 ) ................................ -0.3v to +5.5v in+, in- ........................................... (v ee - 2.5v) to (v cc + 0.3v) rt+, rt- ......................................... (v ee - 2.5v) to (v cc + 0.3v) rt- to in- and rt+ to in+ .................................................... q 2v vocm, shdn , out+, out- .......... (v ee - 0.3v) to (v cc + 0.3v) output short-circuit duration (out+ to out-) ....................... 1s continuous input current (any pin except v ee , v cc , out+, out-) .................... q 20ma continuous power dissipation (t a = +70 n c) 12-pin tqfn multilayer board (deration 16.7mw/ n c above +70 n c) .......................................................... 1333.3mw b ja ........................................................................ 60mw/ n c b jc ........................................................................ 11mw/ n c operating temperature range ........................ -40 n c to +125 n c junction temperature ..................................................... +150 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering, 10s) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c electrical characteristics (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v vocm = v cc /2, r l = 500 i (between out+ and out-), t a = -40c to +125c. typical values are at +25c, unless otherwise noted.) (note 1) absolute maximum ratings parameter symbol conditions min typ max units dc specifications supply voltage range v cc guaranteed by psrr 2.85 5.25 v supply current i cc shdn = v cc 59 80 ma shdn = gnd 25 50 f a power-supply rejection ratio psrr v vcom = v cc /2, 2.85v p v cc p 5.25v, -40 n c p t a p +85 n c max9626 66 89 db max9627 66 92 max9628 64 92 v vcom = v cc /2, 2.85v p v cc p 5.25v, -40 n c p t a p +125 n c max9626 60 89 max9627 63 92 max9628 64 92 differential voltage gain g diff v out+, v out- = -1v to +1v max9626 1 v/v max9627 2 max9628 4 gain error v out+, v out- = -1v to +1v max9626 -2 0.2 +2 % max9627 -2 0.2 +2 max9628 -2 0.2 +2 input offset voltage differential input, v in- = v in+ = v cc /2, t a = +25 n c max9626 2 11 mv max9627 2 8 max9628 2 8 differential input, v in- = v in+ = v cc /2 t a = -40 c to +125 n c max9626 2 13 max9627 2 10 max9628 2 10 common-mode input voltage range (note 2) v icm guaranteed by cmrr max9626 -1.5 +1.5 v max9627 -0.75 +1.5 max9628 -0.4 +1.5
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 3 electrical characteristics (continued) (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v vocm = v cc /2, r l = 500 i (between out+ and out-), t a = -40c to +125c. typical values are at +25c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units common-mode rejection ratio cmrr max9626 46 62 db max9627 50 69 max9628 54 79 output voltage swing v oh vocm = v cc v cc - 1 v cc - 0.8 v v ol v vocm = 0v v ee + 0.65 v ee + 0.9 output current source: v cc - v out = 0.95v 100 ma sink: v out - v ee = 0.95v 100 common-mode input resistance max9626 200 i max9627 225 max9628 312 differential input resistance max9626 267 i max9627 225 max9628 209 input termination resistance rt- to in- and rt+ to in+ 64 i ac specifications 3db large-signal bandwidth lsb 3db v out+ - v out- = 2.0v p-p max9626 1150 mhz max9627 1350 max9628 1000 0.1db large-signal bandwidth lsb 0.1db v out+ - v out- = 2.0v p-p max9626 80 mhz max9627 80 max9628 90 slew rate sr v out+ - v out- = 2.0v p-p max9626 6500 v/ f s max9627 6100 max9628 5500 ac power-supply rejection ratio ac psrr v vocm = 1.65v, f = 10mhz max9626 64 db max9627 65 max9628 62 input voltage noise e n f = 10mhz max9626 5.7 nv/ hz max9627 4.3 max9628 3.6 noise figure nf r s = 50 i max9626 22.2 db max9627 19.7 max9628 18.1
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 4 note 1: all devices are 100% production tested at t a = +25c. temperature limits are guaranteed by design. note 2: input voltage range is a function of vocm. see the input voltage range section for details. note 3: limits are guaranteed by design based on bench characterization. testing is functional using different limits. electrical characteristics (continued) (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v vocm = v cc /2, r l = 500 i (between out+ and out-), t a = -40c to +125c. typical values are at +25c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units harmonic distortion hd f = 10mhz, v out+ - v out- = 2.0v p- p, v cc = 5v max9626 hd2 -98 dbc hd3 -103 max9627 hd2 -102 hd3 -105 max9628 hd2 -91 hd3 -97 f = 125mhz, v out+ - v out- = 2.0v p-p, v cc = 5v max9626 hd2 -80 hd3 -80 max9627 hd2 -86 hd3 -80 max9628 hd2 -80 hd3 -75 capacitive load c load no sustained oscillation 10 pf power-up time 2.3 f s vocm input pin input voltage range guaranteed by vocm cmrr test 1.1 v cc - 1.1 v output common-mode rejection ratio (note 3) cmrr vocm 52 64 db output common-mode gain (note 3) g vocm v vocm = 1.1v to v cc -1.1v, t a = -40 c to +125 n c 0.98 0.99 1.00 v/v input offset voltage (note 3) 12 21 mv input bias current 1 10 f a input impedance 35 m i output balance error d v out = 1v pp , f = 10mhz -77 db -3db small-signal bandwidth v vocm = 0.1v p-p 700 mhz shdn input pin input voltage v il 0.8 v v ih 1.2 input current i il v shdn = 0v 0.01 2 f a i ih v shdn = v cc 3.3 20 turn-on time t on 0.6 f s turn-off time t off 0.2
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 5 typical operating characteristics (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v icm = 0v, v vocm = v cc /2, r l = 500, single ended. plot applies to all versions, unless noted otherwise.) max9626 toc01 frequency (khz) harmonic distiortion (dbc) 100,000 -110 10,000 harmonic distortion vs. frequency r l = 100i, v cc = 5v -90 -100 -80 -70 -60 -50 -40 hd3 hd2 max9626 max9626 toc02 frequency (khz) harmonic distiortion (dbc) 100,000 -110 10,000 harmonic distortion vs. frequency r l = 500i, v cc = 5v -90 -100 -80 -70 -60 -50 -40 max9626 hd2 hd3 max9626 toc03 frequency (khz) harmonic distiortion (dbc) 100,000 -110 10,000 harmonic distortion vs. frequency r l = 1ki, v cc = 5v -90 -100 -80 -70 -60 -50 -40 hd3 hd2 max9626 max9626 toc04 frequency (khz) harmonic distiortion (dbc) 100,000 -110 10,000 harmonic distortion vs. frequency r l = 100i, v cc = 5v -90 -100 -80 -70 -60 -50 -40 max9627 hd2 hd3 harmonic distortion vs. frequency r l = 500i, v cc = 5v max9626 toc05 frequency (khz) harmonic distortion (dbc) 100,000 -110 -100 -90 -80 -70 -60 -50 -40 -120 10,000 hd2 hd3 max9627 harmonic distortion vs. frequency r l = 1ki, v cc = 5v max9626 toc06 frequency (khz) harmonic distortion (dbc) 100,000 -110 -100 -90 -80 -70 -60 -50 -40 -120 10,000 max9627 hd2 hd3 harmonic distortion vs. frequency r l = 100i, v cc = 5v max9626 toc07 frequency (khz) harmonic distiortion (dbc) 100,000 -90 -80 -70 -60 -50 -40 -100 10,000 hd2 hd3 max9628 harmonic distortion vs. frequency r l = 500i, v cc = 5v max9626 toc08 frequency (khz) harmonic distortion (dbc) 100,000 -110 -100 -90 -80 -70 -60 -50 -40 -120 10,000 max9628 harmonic distortion vs. frequency r l = 1ki, v cc = 5v max9626 toc09 frequency (khz) harmonic distortion (dbc) 100,000 -110 -100 -90 -80 -70 -60 -50 -40 -120 10,000 max9628 hd2 hd3
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 6 typical operating characteristics (continued) (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v icm = 0v, v vocm = v cc /2, r l = 500, single ended. plot applies to all versions, unless noted otherwise.) harmonic distortion vs. load f = 125mhz, v cc = 5v max9626 toc13 load (i) harmonic distortion (db) 900 800 100 200 300 500 600 400 700 -110 -100 -90 -80 -70 -60 -50 -40 -120 0 1000 max9627 hd3 hd2 harmonic distortion vs. load f = 10mhz, v cc = 5v max9626 toc14 load (i) harmonic distortion (db) 900 800 700 600 500 400 300 200 100 -110 -100 -90 -80 -70 -60 -120 0 1000 max9628 hd2 hd3 harmonic distortion vs. load f = 125mhz, v cc = 5v max9626 toc15 load (i) harmonic distortion (db) 900 800 100 200 300 500 600 400 700 -95 -90 -85 -80 -75 -70 -65 -60 -100 0 1000 max9628 hd3 hd2 harmonic distortion vs. differential output swing f = 10mhz, v cc = 5v max9626 toc16 output swing (v) harmonic distortion (db) 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 -110 -100 -90 -80 -70 -60 -120 1.0 3.0 max9627 hd3 hd2 harmonic distortion vs. load f = 10mhz, v cc = 5v max9626 toc10 load (i) harmonic distortion (db) 900 800 700 600 500 400 300 200 100 -110 -100 -90 -80 -70 -60 -120 0 1000 max9626 hd2 hd3 harmonic distortion vs. load f = 125mhz, v cc = 5v max9626 toc11 load (i) harmonic distortion (db) 900 800 700 600 500 400 300 200 100 -85 -80 -75 -70 -65 -60 -90 0 1000 max9626 hd3 hd2 harmonic distortion vs. load f = 10mhz, v cc = 5v max9626 toc12 load (i) harmonic distortion (db) 900 800 700 600 500 400 300 200 100 -110 -100 -90 -80 -70 -60 -120 0 1000 max9627 hd2 hd3 harmonic distortion vs. differential output swing f = 10mhz, v cc = 5v max9626 toc15b output swing (v) harmonic distortion (db) 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 -110 -100 -90 -80 -70 -60 -120 1.0 3.0 hd3 hd2 max9626 harmonic distortion vs. differential output swing f = 125mhz, v cc = 5v max9626 toc15c output swing (v) harmonic distortion (db) 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 -110 -100 -90 -80 -70 -60 -120 1.0 3.0 hd3 hd2 max9626
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 7 typical operating characteristics (continued) (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v icm = 0v, v vocm = v cc /2, r l = 500, single ended. plot applies to all versions, unless noted otherwise.) harmonic distortion vs. differential output swing f = 125mhz, v cc = 5v max9626 toc17 output swing (v) harmonic distortion (db) 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 -110 -100 -90 -80 -70 -60 -120 1.0 3.0 max9627 hd3 hd2 harmonic distortion vs. differential output swing f = 10mhz, v cc = 5v max9626 toc18 output swing (v) harmonic distortion (db) 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 -110 -100 -90 -80 -70 -60 -120 1.0 3.0 max9628 hd2 hd3 harmonic distortion vs. differential output swing f = 125mhz, v cc = 5v max9626 toc19 output swing (v) harmonic distortion (db) 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 -110 -100 -90 -80 -70 -60 -120 1.0 3.0 max9628 hd2 hd3 small-signal bandwidth vs. frequency v cc = 3.3v, r l = 100i, v sig = 100mv p-p max9626 toc20 frequency (hz) gain (db) 1g 100m 10m -8 -6 -4 -2 0 2 4 6 8 10 -10 1m 10g max9626 small-signal bandwidth vs. frequency v cc = 5v, r l = 100i, v sig = 100mv p-p max9626 toc21 frequency (hz) gain (db) -8 -6 -4 -2 0 2 4 6 8 10 -10 max9626 1g 100m 10m 1m 10g small-signal bandwidth vs. frequency v cc = 3.3v, r l = 100i, v sig = 100mv p-p max9626 toc22 frequency (hz) gain (db) -8 -6 -4 -2 0 2 4 6 8 10 -10 max9627 1g 100m 10m 1m 10g small-signal bandwidth vs. frequency v cc = 5v, r l = 100i, v sig = 100mv p-p max9626 toc23 frequency (hz) gain (db) -8 -6 -4 -2 0 2 4 6 8 10 -10 max9627 1g 100m 10m 1m 10g small-signal bandwidth vs. frequency v cc = 3.3v, r l = 100i, v sig = 100mv p-p max9626 toc24 frequency (hz) gain (db) -8 -6 -4 -2 0 2 4 6 8 10 -10 max9628 1g 100m 10m 1m 10g frequency (hz) small-signal bandwidth vs. frequency v cc = 5v, r l = 100i, v sig = 100mv p-p max9626 toc25 gain (db) -8 -6 -4 -2 0 2 4 6 8 10 -10 max9628 1g 100m 10m 1m 10g
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 8 typical operating characteristics (continued) (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v icm = 0v, v vocm = v cc /2, r l = 500, single ended. plot applies to all versions, unless noted otherwise.) frequency (hz) large-signal bandwidth vs. frequency v cc = 3.3v, r l = 100i, v sig = 2v p-p max9626 toc26 gain (db) -8 -6 -4 -2 0 2 4 6 8 10 -10 max9626 1g 100m 10m 1m 10g frequency (hz) large-signal bandwidth vs. frequency v cc = 5v, r l = 100i, v sig = 2v p-p max9626 toc27 gain (db) -8 -6 -4 -2 0 2 4 6 8 10 -10 max9626 1g 100m 10m 1m 10g frequency (hz) large-signal bandwidth vs. frequency v cc = 3.3v, r l = 100i, v sig = 2v p-p max9626 toc28 gain (db) -8 -6 -4 -2 0 2 4 6 8 10 -10 max9627 1g 100m 10m 1m 10g frequency (hz) large-signal bandwidth vs. frequency v cc = 5v, r l = 100i, v sig = 2v p-p max9626 toc29 gain (db) -8 -6 -4 -2 0 2 4 6 8 10 -10 max9627 1g 100m 10m 1m 10g frequency (hz) large-signal bandwidth vs. frequency v cc = 3.3v, r l = 100i, v sig = 2v p-p max9626 toc30 gain (db) -8 -6 -4 -2 0 2 4 6 8 10 -10 max9628 1g 100m 10m 1m 10g frequency (hz) large-signal bandwidth vs. frequency v cc = 5v, r l = 100i, v sig = 2v p-p max9626 toc31 gain (db) -8 -6 -4 -2 0 2 4 6 8 10 -10 max9628 1g 100m 10m 1m 10g small-signal bandwidth vs. resistive load max9626 toc32 r l ( i ) small-signal bandwidth (ghz) 900 800 600 700 200 300 400 500 100 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 0 1000 max9628 max9626 max9627 large-signal bandwidth vs. resistive load max9626 toc33 r l ( i ) large-signal bandwidth (ghz) 900 800 600 700 200 300 400 500 100 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 0 1000 max9628 max9627 max9626 small-signal bandwidth vs. v vocm max9626 toc34 v vocm (v) small signal bandwidth (ghz) 3.5 3.0 2.5 2.0 1.5 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 1.0 4.0 v cc = 5v v cc = 3.3v max9626
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 9 typical operating characteristics (continued) (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v icm = 0v, v vocm = v cc /2, r l = 500, single ended. plot applies to all versions, unless noted otherwise.) small-signal bandwidth vs. v vocm max9626 toc35 v vocm (v) small-signal bandwidth (ghz) 3.5 3.0 1.5 2.0 2.5 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 1.0 4.0 v cc = 5v v cc = 3.3v max9627 small-signal bandwidth vs. v vocm max9626 toc36 v vocm (v) small-signal bandwidth (ghz) 3.5 3.0 2.5 2.0 1.5 0.2 0.4 0.6 0.8 1.0 1.2 0 1.0 4.0 v cc = 5v v cc = 3.3v max9628 input referred voltage noise vs. frequency max9626 toc37 frequency (hz) input referred voltage noise (nv/hz) 10 100 1000 1 1m 100k 10k 1k 100 10 1 0.1 10m max9626 input referred voltage noise vs. frequency max9626 toc38 frequency (hz) input referred voltage noise (nv/hz) 10 100 1000 1 1m 100k 10k 1k 100 10 1 0.1 10m max9627 input referred voltage noise vs. frequency max9626 toc39 frequency (hz) input referred voltage noise (nv/hz) 10 100 1000 1 1m 100k 10k 1k 100 10 1 0.1 10m max9628 noise figure vs. frequency max9626 toc40 frequency (hz) noise figure (db) 10 20 30 40 50 60 70 0 1m 100k 10k 1k 100 10 1 0.1 10m max9626 max9627 max9628 common-mode rejection ratio vs. frequency (max9626) max9626 toc41 frequency (mhz) cmrr (db) 100 10 1 10 20 30 40 50 60 70 0 0.1 1000 common-mode rejection ratio vs. frequency (max9627) max9626 toc42 cmrr (db) 10 20 30 40 50 60 70 80 0 frequency (mhz) 100 10 1 0.1 1000 common-mode rejection ratio vs. frequency (max9628) max9626 toc43 cmrr (db) 10 20 30 40 50 60 70 80 0 frequency (mhz) 100 10 1 0.1 1000
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 10 typical operating characteristics (continued) (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v icm = 0v, v vocm = v cc /2, r l = 500, single ended. plot applies to all versions, unless noted otherwise.) power-supply rejection ratio vs. frequency (max9626) max9626 toc44 frequency (mhz) psrr (db) 100 10 1 0.1 10 20 30 40 50 60 70 80 90 100 0 0.01 1000 offset voltage histogram (max9626) max9626 toc45 differential offset voltage (mv) occurance (%) 1 0 -1 -2 -3 5 10 15 20 25 30 35 0 -4 offset voltage histogram (max9627) max9626 toc46 differential offset voltage (mv) occurance (%) 1 0 -1 -2 -3 5 10 15 20 25 30 35 40 45 50 0 -4 offset voltage histogram (max9628) max9626 toc47 differential offset voltage (mv) occurance (%) 1 0 -1 -2 -3 10 20 30 40 50 60 0 -4 gain error histogram (max9626) max9626 toc48 gain error (%) occurance (%) 0.4 0.2 -0.2 0 -0.6 -0.4 -0.8 5 10 15 20 25 30 35 40 45 50 0 -1.0 gain error histogram (max9627) max9626 toc49 gain error (%) occurance (%) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 10 20 30 40 50 60 0 -1.0 gain error histogram (max9628) max9626 toc50 gain error (%) occurance (%) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 10 20 30 40 50 60 0 -1.0 power-supply rejection ratio vs. frequency (max9627) max9626 toc44a frequency (mhz) psrr (db) 100 10 1 0.1 10 20 30 40 50 60 70 80 90 100 0 0.01 1000 power-supply rejection ratio vs. frequency (max9628) max9626 toc44b frequency (mhz) psrr (db) 100 10 1 0.1 10 20 30 40 50 60 70 80 90 100 0 0.01 1000
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 11 typical operating characteristics (continued) (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v icm = 0v, v vocm = v cc /2, r l = 500, single ended. plot applies to all versions, unless noted otherwise.) supply current vs. supply voltage max9626 toc51 supply voltage (v) supply current (ma) 5.5 3.5 4.0 4.5 5.0 3.0 52 54 56 58 60 62 64 50 2.5 max9626 max9627 max9628 supply current vs. temperature max9626 toc52 temperature (c) supply current (ma) 100 0 2 5 5 0 7 5 -25 52 54 56 58 60 62 64 66 68 70 50 -50 max9627 max9628 max9626 s parameters vs. frequency (max9626) max9626 toc52a frequency (mhz) gain magnitude (db) 1000 100 10 -100 -80 -60 -40 -20 0 -120 1 10,000 s11 s22 s12 s parameters vs. frequency (max9627) max9626 toc52b frequency (mhz) gain magnitude (db) 1000 100 10 -100 -80 -60 -40 -20 0 -120 1 10,000 s11 s22 s12 s parameters vs. frequency (max9628) max9626 toc52c frequency (mhz) gain magnitude (db) 1000 100 10 -100 -80 -60 -40 -20 0 -120 1 10,000 s11 s22 s12 intermodulation distortion vs. frequency (max9626, v cc = 5v) max9626 toc52d frequency (mhz) harmonic distortion (dbc) 175 150 125 100 75 -90 -85 -80 -75 -70 -65 -60 -55 -50 -95 50 200 imd2, v out = 2v p-p imd2, v out = 3v p-p frequency spacing = 100khz imd3, v out = 3v p-p imd3, v out = 2v p-p intermodulation distortion vs. frequency (max9626, v cc = 3.3v) max9626 toc52e frequency (mhz) harmonic distortion (dbc) 175 150 125 100 75 50 200 imd2, v out = 1v p-p imd2, v out = 2v p-p frequency spacing = 100khz imd3, v out = 1v p-p imd3, v out = 2v p-p -85 -80 -75 -70 -65 -60 -55 -50 -90 intermodulation distortion vs. frequency (max9627, v cc = 5v) max9626 toc52f frequency (mhz) harmonic distortion (dbc) 175 150 125 100 75 50 200 imd2, v out = 2v p-p imd2, v out = 3v p-p frequency spacing = 100khz imd3, v out = 2v p-p imd3, v out = 3v p-p -85 -80 -75 -70 -65 -60 -55 -50 -90 intermodulation distortion vs. frequency (max9627, v cc = 3.3v) max9626 toc52g frequency (mhz) harmonic distortion (dbc) 175 150 125 100 75 50 200 imd2, v out = 1v p-p imd2, v out = 2v p-p frequency spacing = 100khz imd3, v out = 1v p-p imd3, v out = 2v p-p -85 -80 -75 -70 -65 -60 -55 -50 -90
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 12 typical operating characteristics (continued) (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v icm = 0v, v vocm = v cc /2, r l = 500, single ended. plot applies to all versions, unless noted otherwise.) output balance error vs. frequency max9626 toc52j output balance error (db) -80 -70 -60 -50 -40 -30 -20 -10 0 -90 frequency (mhz) 1000 100 10 1 10,000 output impedance vs. frequency max9626 toc52k frequency (mhz) output impedance ( i ) 100 10 0.1 1 10 100 0.01 1 1000 vcom small-signal gain vs. frequency max9626 toc52l frequency (mhz) small-signal gain (db) 1000 100 10 -10 -5 0 5 10 15 -15 1 10,000 vocm transient response (max9626, v in = 1.6v to 1.7v step) max9626 toc52m 50mv/div 50mv/div 2ns/div vocm out_cm vocm transient response (max9626, v in = 1.15v to 2.15v step) max9626 toc52n 500mv/div 500mv/div 2ns/div vocm out_cm vocm transient response (max9627, v in = 1.6v to 1.7v step) max9626 toc52o 50mv/div 50mv/div 2ns/div vocm out_cm vocm transient response (max9627, v in = 1.15v to 2.15v step) max9626 toc52p 500mv/div 500mv/div 2ns/div vocm out_cm intermodulation distortion vs. frequency (max9628, v cc = 5v) max9626 toc52h frequency (mhz) harmonic distortion (dbc) 175 150 125 100 75 50 200 imd2, v out = 2v p-p imd2, v out = 3v p-p frequency spacing = 100khz imd3, v out = 2v p-p imd3, v out = 3v p-p -90 -85 -80 -75 -70 -65 -60 -55 -50 -95 intermodulation distortion vs. frequency (max9628, v cc = 3.3v) max9626 toc52i frequency (mhz) harmonic distortion (dbc) 175 150 125 100 75 50 200 imd2, v out = 2v p-p imd2, v out = 1v p-p frequency spacing = 100khz imd3, v out = 1v p-p imd3, v out = 2v p-p -85 -80 -75 -70 -65 -60 -55 -50 -90
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 13 typical operating characteristics (continued) (v cc = +3.3v, v ee = 0v, v in- = v in+ = 0v, shdn = v cc , v icm = 0v, v vocm = v cc /2, r l = 500, single ended. plot applies to all versions, unless noted otherwise.)versions, unless noted otherwise.) large-signal transient response (max9627, v in = 0 to 500mv step, v ocm = 1.65v) max9626 toc57 200mv/div 400mv/div 2ns/div inp out_diff large-signal transient response (max9628, v in = 0 to 250mv step, v ocm = 1.65v) max9626 toc58 200mv/div 400mv/div 2ns/div inp out_diff small-signal transient response (max9626, v in = 0 to 100mv step, v ocm = 1.65v) max9626 toc53 50mv/div 40mv/div 2ns/div inp out_diff small-signal transient response (max9627, v in = 0 to 50mv step, v ocm = 1.65v) max9626 toc54 20mv/div 40mv/div 2ns/div inp out_diff small-signal transient response (max9628, v in = 0 to 25mv step, v ocm = 1.65v) max9626 toc55 20mv/div 40mv/div 2ns/div inp out_diff large-signal transient response (max9626, v in = 0 to 1v step, v ocm = 1.65v) max9626 toc56 1v/div 400mv/div 2ns/div inp out_diff vocm transient response (max9628, v in = 1.6v to 1.7v step) max9626 toc52q 50mv/div 50mv/div 2ns/div vocm out_cm vocm transient response (max9628, v in = 1.15v to 2.15v step) max9626 toc52r 500mv/div 500mv/div 2ns/div vocm out_cm
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 14 pin description pin configuration 12 11 10 4 5 vocm in- 6 in+ shdn out+ out- 1 2 v ee 3 9 8 7 rt+ ep v cc v cc rt- max9626 max9627 max9628 v ee tqfn + top view pin name function 1 in+ noninverting differential input 2 vocm output common-mode voltage input 3 in- inverting differential input 4 rt- termination resistor terminal for in- 5, 6 v cc positive supply voltage 7 out+ noninverting differential output 8 shdn active-low shutdown mode input 9 out- inverting differential output 10, 11 v ee negative supply voltage 12 rt+ termination resistor terminal for in+ ep exposed pad. connected to v ee .
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 15 detailed description the max9626/max9627/max9628 family employs voltage feedback to implement a differential-in to differential-out amplifier. on-chip feedback resistors set the gain of the amplifier. the use of on-chip resistors not only saves cost and space, but also maximizes the overall amplifiers performance. there are two feedback loops within the amplifier circuit. the differential feedback loop employs the on- chip resistors to set the differential gain. the signal is applied differentially at the inputs and the output signal is obtained differentially at the outputs. the common-mode feedback loop controls the common-mode voltage at the outputs. both inverting and noninverting outputs exhibit a common-mode voltage equal to the voltage applied at vocm input, without affecting the differential output signal. the outputs are perfectly balanced having signals of equal amplitude and 180 n apart in-phase. amplifier input impedance is determined by internal gain resistors. therefore, source impedance does affect the gain of the amplifier. input termination resistors are required to achieve source impedance match. if preferred, the customer has the choice of using the on-chip termination resistors. if they are used, then the amplifiers input impedance is 50 i for single- ended input configuration. the amplifiers differential gain accuracy is directly affected by the source impedance value. the ics feature a proprietary circuit design. the use of predistortion and dynamic distortion cancellation greatly improves large-signal ac-performance at high frequency. fixed gain options for best ac performance the ics have internal gain resistors to achieve excellent bandwidth and distortion performance. because the virtual ground nodes among the gain resistors and the inputs of the amplifier are internal to the device, the parasitic capacitors of such nodes are kept to the minimum. this enhances the ac performance of the device. the ics have three gain options with resistor values as per table 1, while keeping the bandwidth constant. the differential gain is given by the equation: g = r f /r g internal terminations use the internal r t resistors in applications where the source impedance r s is 50 i and the input impedance of the amplifier has to match with it. for a perfectly balanced circuit driven by a differential source impedance, the input impedance of the amplifier is given by the simple equation r in = 2 x r g . for single-ended input applications, where the source impedance of 50 i connects to either input, such as in the typical operating circuit , the input impedance of the amplifier is given by the equation: g in f g f r r r 1 2 x (r r ) = ? ? ? ? ? + ? ? to match the input impedance r s , the following condi - tion must be met: r in ||r t = r s therefore: ( ) s t s f g g g f r r r 0.5 x r 2 x r r 1 r r = ? ? ? ? + ? ? ? ? ? ? ? ? ? ? ? + ? ? ? ? ? ? from this equation it can be inferred that r t is about 64 i for all the cases of table 1. table 1. amplifiers gain setting and internal resistor values gain (v/v) r g ( i ) r f ( i ) 3db bandwidth (ghz) 1 200 200 1 2 150 300 1.35 4 125 500 1.15
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 16 the gain options with the internal termination resistors r t are given by the following equation and typical numbers are summarized in table 2. gain values are dependent on actual source impedance and on-chip r t , r g , and r f values. the latter are subject to process variation. ( ) f t t s g s g r x r gain r r r r x r = + + for single-ended to differential applications where the source impedance is 50 i , such as the case of the typical application circuit , connect an external 50 i resistor at the other input to maintain symmetry and mini - mize the gain error. applications information input voltage range one of the typical applications is the translation of a single-ended input signal that is referenced to ground to a differential output signal that feeds a high-speed pipeline analog-to-digital converter (adc) such as the one in the typical application circuit . because the input signal has 0v common mode, the majority of the ampli - fiers would require a negative supply. the ics allow the input signal to be below ground even with single-supply operation (v ee connected to gnd). how far below ground depends on the gain option. see the electrical characteristics table and figures 1, 2, and 3 for details. use the following equation to determine the input com - mon-mode range: amp out_cm in_cm (v v ) (g 1) v x (g 1) g ? + = + where v in_cm is the input common-mode voltage. v amp is the voltage at the input node of the internal amplifier. v out_cm is the output common-mode voltage. g is the gain of the device. table 2. typical gain values when using the internal termination resistors (r t and r s = 50) figure 1. max9626 input common-mode voltage vs. output common-mode voltage of the amplifier figure 2. max9627 input common-mode voltage vs. output common-mode voltage of the amplifier figure 3. max9628 input common-mode voltage vs. output common-mode voltage of the amplifier v out_cm (v) v in_cm (v) 2.2 2.1 1.9 2.0 1.3 1.4 1.5 1.6 1.7 1.8 1.1 1.2 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 2.5 -2.5 1.0 2.3 v in_cm high v in_cm low gain = 1 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -1.5 v out_cm (v) v in_cm (v) 2.2 2.1 1.9 2.0 1.3 1.4 1.5 1.6 1.7 1.8 1.1 1.2 1.0 2.3 v in_cm high v in_cm low gain = 2 -1.0 -0.5 0 0.5 1.0 1.5 2.0 v out_cm (v) v in_cm (v) 2.2 2.1 1.9 2.0 1.3 1.4 1.5 1.6 1.7 1.8 1.1 1.2 1.0 2.3 v in_cm high v in_cm low gain = 4 r t ( i ) r g ( i ) r f ( i ) gain (v/v) 64 200 200 0.48 64 150 300 0.95 64 125 500 1.85
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 17 input voltage noise the input referred voltage noise specification reported in the electrical characteristics table includes both the noise contribution of the amplifier and the contribution of all the internal resistive elements. because such resistive elements change depending on the gain selection as per table 1, the input voltage noise specification differs according to the gain options. setting the output common-mode voltage the ics feature an input, vocm, that sets the differential output common-mode voltage. its wide range from 1.1v to v cc - 1.1v makes the amplifier family compatible with most of the high-speed pipeline differential input adcs. while many of these adcs accept an input common- mode around half of their supply voltage, some of them have input common-mode range shifted toward either ground or the positive supply. the ics can comfortably drive both 3.3v and 5v adcs that have common-mode range around half supply. when powered with v cc of 5v or higher, the ics can also drive some of the popular adcs with common-mode range higher than 3v. the high bandwidth of vocm makes the amplifier's out - put recover quickly from load transient conditions. such conditions may occur when switching the adc input capacitor during the track-and-hold phases. the input capacitor switching may cause a voltage glitch at the input of the adc, which incurs a load transient condition for the driving amplifier. power-supply decoupling and layout techniques the ics are high-speed devices, sensitive to the pcb environment in which they operate. realizing their superior performance requires attention to the details of high- speed pcb design. the first requirement is a solid continuous ground plane on the second pcb layer, preferably with no signal or power traces. pcb layers 3 and 4 can be power-supply routing or signal routing, but preferably they should not be routed together. for power-supply decoupling with single-supply opera - tion, place a large capacitor by the v cc supply node and then place a smaller capacitor as close as possible to the v cc pin. for 1ghz decoupling, 22pf to 100pf are good values to use. when used with split supplies, place relevant capacitors on the v ee supply as well. ground vias are critical to provide a ground return path for high frequency signals and should be placed near the decoupling capacitors. place ground vias on the exposed pad as well, along the edges and near the pins to shorten the return path and maximize isolation. vias should also be placed next to the input and output signal traces to maximize isolation. finally, make sure that the layer 2 ground plane is not severely broken up by signal vias or power supply vias. signal routing should be short and direct to avoid parasitic effects. for very high-frequency designs, avoid using right angle connectors since they may introduce a capacitive discontinuity and ultimately limit the fre - quency response. recommended pipeline adcs the max9626/max9627/max9628 family offers excel - lent bandwidth and distortion performance that is in line with the majority of high-speed and 16-bit resolution pipeline adcs in the market. in particular, it is recom - mended in combination with the max19586/max19588 family of 16-bit and 100msps pipeline adcs. for lower resolution applications, the max9626/ max9627/max9628 family can also drive 10- to 14-bit adcs such as the max12553/max12554/max12555, max12527/max12528/max12529 and max19505/ max19506/max19507 families.
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 18 package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code outline no. land pattern no. 12 tqfn t1233+1 21-0136 90-0066
max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers 19 package information (continued) for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status.
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 20 maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. max9626/max9627/max9628 low-noise, low-distortion, 1.35ghz fully differential amplifiers revision history revision number revision date description pages changed 0 9/10 initial release 1 2/11 updated shutdown current value, updated electrical characteristics table, updated. internal terminations section, and added new typical operating characteristics 1C7, 14

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