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general description the MAX2035 8-channel variable-gain amplifier (vga) is designed for high linearity, high dynamic range, and low-noise performance targeting ultrasound imaging and doppler applications. each amplifier features dif- ferential inputs and outputs and a total gain range of typically 50db. in addition, the vgas offer very low out- put-referred noise performance suitable for interfacing with 10-bit adcs. the MAX2035 vga is optimized for less than ?.5db absolute gain error to ensure minimal channel-to-chan- nel ultrasound beamforming focus error. the device? differential outputs are designed to directly drive ultra- sound adcs through an external passive anti-aliasing filter. a switchable clamp is also provided at each ampli- fier? outputs to limit the output signals, thereby prevent- ing adc overdrive or saturation. dynamic performance of the device is optimized to reduce distortion to support second-harmonic imaging. the device achieves a second-harmonic distortion specification of -62dbc at v out = 1.5v p-p and f in = 5mhz, and an ultrasound-specific* two-tone third-order intermodulation distortion specification of -52dbc at v out = 1.5v p-p and f in = 5mhz. the MAX2035 operates from a +5.0v power supply, consuming only 127mw/channel. the device is avail- able in a 100-pin tqfp package with an exposed paddle. electrical performance is guaranteed over a 0 c to +70 c temperature range. applications ultrasound imaging sonar features 8-channel configuration high integration for ultrasound imaging applications pin compatible with the max2036 ultrasound vga plus cw doppler beamformer maximum gain, gain range, and output-referred noise optimized for interfacing with 10-bit adcs maximum gain of 39.5db total gain range of 50db 60nv/ hz ultra-low output-referred noise at 5mhz pin-for-pin 12-bit compatibility supported by max2037/max2038 ?.5db absolute gain error switchable output vga clamp eliminating adc overdrive fully differential vga outputs for direct adc drive variable gain range achieves 50db dynamic range -62dbc hd2 at v out = 1.5v p-p and f in = 5mhz two-tone ultrasound-specific* imd3 of -52dbc at v out = 1.5v p-p and f in = 5mhz 127mw consumption per channel * see the ultrasound-specific imd3 specification in the applications information section. MAX2035 ultrasound variable-gain amplifier ________________________________________________________________ maxim integrated products 1 ordering information 19-0630; rev 0; 10/06 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ? ep = exposed paddle. + denotes lead-free package. t = tape-and-reel package. d = dry packing. part temp range pin-package pkg code MAX2035ccq-d 0 c to +70 c 100 tqfp-ep ? (14mm x 14mm) c100e-3 MAX2035ccq-td 0 c to +70 c 100 tqfp-ep ? (14mm x 14mm) c100e-3 MAX2035ccq+d 0 c to +70 c 100 tqfp-ep ? (14mm x 14mm) c100e-3 MAX2035ccq+td 0 c to +70 c 100 tqfp-ep ? (14mm x 14mm) c100e-3 functional diagram MAX2035 bias circuitry gnd ext_res v cc v ref pd vg_ctl+ vg_ctl- vg_clamp_mode vg_out1+ vg_out1- vg_out8+ vg_out8- vg_in1+ vg_in1- vg_in8+ vg_in8- -10.5db to +39.5db vga 50 ? 50 ? vga 50 ? 50 ?
MAX2035 ultrasound variable-gain amplifier 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (figure 2, v cc = v ref = 4.75v to 5.25v, gnd = 0v, pd = 0, no rf signals applied, capacitance to gnd at each of the vga differen- tial outputs is 60pf, differential capacitance across the vga outputs is 10pf, r l = 1k ? , t a = 0 c to +70 c. typical values are at v cc = v ref = 5v, t a = +25 c, unless otherwise noted.) (note 1) 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. v cc , v ref to gnd .................................................-0.3v to +5.5v any other pins to gnd...............................-0.3v to (v cc + 0.3v) vga differential input voltage (vgin_+ - vgin_-)...........8.0v p-p analog gain-control input differential voltage (vg_ctl+ - vg_ctl-)...................................................8.0v p-p continuous power dissipation (t a = +70?) 100-pin tqfp (derated 45.5mw/? above +70?).........................3636.4mw operating temperature range...............................0? to +70? junction temperature ......................................................+150? jc ...................................................................................+2?/w ja .................................................................................+22?/w storage temperature range .............................-40? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol condtions min typ max units supply voltage range v cc 4.75 5 5.25 v v cc external reference voltage range v ref (note 2) 4.75 5 5.25 v pd = 0 204 231 total power-supply current refers to v cc supply current plus v ref current pd =1 27 33 ma v cc supply current i vcc 192 216 ma v ref current i ref 12 15 ma current consumption per amplifier channel refers to v cc supply current 24 27 ma minimum gain +2 differential analog control voltage range maximum gain -2 v p-p differential analog control common-mode voltage v cm 2.85 3.0 3.15 v analog control input source/sink current 4.5 5 ma logic inputs cmos input-high voltage v ih 2.0 v cmos input-low voltage v il 0.8 v
MAX2035 ultrasound variable-gain amplifier _______________________________________________________________________________________ 3 ac electrical characteristics (figure 2, v cc = 4.75v to 5.25v, v cm = 3/5 v cc , v ref = 5.0v, gnd = 0v, pd = 0, vg_clamp_mode = 1, f rf = 5mhz, capacitance to gnd at each of the vga differential outputs is 60pf, differential capacitance across the vga outputs is 10pf, r l = 1k ? , t a = 0 c to +70 c. typical values are at v cc = v ref = 5v, t a = +25 c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units differential output capacitance is 10pf, capacitance to gnd 17 large-signal bandwidth f -3db v out = 1.5v p-p , 3db bandwidth, gain = 20db no capacitive load, r l = 1k ? 22 mhz differential input resistance r in 170 200 230 ? input effective capacitance c in f rf = 10mhz, each input to ground 15 pf differential output resistance r out 100 ? maximum gain 39.5 db minimum gain -10.5 db gain range 50 db t a = +25 c, -2.0v < vg_ctl < -1.8v ?.6 t a = +25 c, -1.8v < vg_ctl < +1.2v ?.5 absolute gain error t a = +25 c, +1.2v < vg_ctl < +2.0v ?.2 db vga gain response time 50db gain change to within 1db final value 1 ? input-referred noise vg_ctl set for maximum gain, no input signal 2 nv/ hz no input signal 60 output-referred noise vg_ctl set for +20db of gain v out = 1.5v p-p , 1khz offset 120 nv/ hz vg_clamp_mode = 1, vg_ctl set for +20db of gain, f rf = 5mhz, v out = 1.5v p-p -55 -62 second harmonic hd2 vg_clamp_mode = 1, vg_ctl set for +20db of gain, f rf = 10mhz, v out = 1.5v p-p -62 dbc third-order intermodulation distortion imd3 vg_clt set for +20db of gain, f rf1 = 5mhz, f rf2 = 5.01mhz, v out = 1.5v p-p (note 3) -40 -52 db
MAX2035 ultrasound variable-gain amplifier 4 _______________________________________________________________________________________ typical operating characteristics (figure 2, v cc = v ref = 4.75v to 5.25v, gnd = 0v, pd = 0, vg_clamp_mode = 1, f rf = 5mhz, capacitance to gnd at each of the vga differential outputs is 60pf, differential capacitance across the vga outputs is 10pf, r l = 1k ? , t a = 0 c to +70 c. typical val- ues are at v cc = v ref = 5v, v cm = 3.0v, t a = +25 c, unless otherwise noted.) overdrive phase delay vs. frequency MAX2035 toc01 v in1 = 35mv p-p differential v in2 = 87.5mv p-p differential gain = 20db 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 2.5 5.0 7.5 10.0 12.5 15.0 overdrive phase delay (ns) frequency (mhz) 17.5 20.0 power-supply modulation ratio MAX2035 toc02 v out = 1.5v p-p differential v mod = 50mv p-p , f carrier = 5mhz, gain = 20db -30 -40 -50 -60 -70 -80 -90 0 25 50 75 100 125 150 psmr (dbc) frequency (khz) 175 200 two-tone ultrasound-specific imd3 vs. gain MAX2035 toc03 -30 -40 -50 -60 -70 -80 -20 -10 0 -15 -5 5 15 25 35 45 imd3 (dbc) gain (db) v out = 1v p-p differential gain = 20db f = 2mhz, 5mhz f = 10mhz note 1: specifications at t a = +25? and t a = +70? are guaranteed by production test. specifications at t a = 0? are guaranteed by design and characterization. note 2: noise performance of the device is dependent on the noise contribution from the supply to v ref . use a low-noise supply for v ref . v cc and v ref can be connected together to share the same supply voltage if the supply for v cc exhibits low noise. note 3: see the ultrasound-specific imd3 specification section. ac electrical characteristics (continued) (figure 2, v cc = 4.75v to 5.25v, v cm = 3/5 v cc , v ref = 5.0v, gnd = 0v, pd = 0, vg_clamp_mode = 1, f rf = 5mhz, capacitance to gnd at each of the vga differential outputs is 60pf, differential capacitance across the vga outputs is 10pf, r l = 1k ? , t a = 0 c to +70 c. typical values are at v cc = v ref = 5v, t a = +25 c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units channel-to-channel crosstalk v out = 1v p-p differential, f rf = 10mhz, vg_ctl set for +20db of gain -80 db maximum output voltage at clamp on vg_clamp_mode = 0, vg_ctl set for +20db of gain, 350mv p-p differential input 2.2 v p-p d i ffer enti al maximum output voltage at clamp off vg_clamp_mode = 1, vg_ctl set for +20db of gain, 350mv p-p differential input 3.4 v p-p d i ffer enti al
MAX2035 ultrasound variable-gain amplifier _______________________________________________________________________________________ 5 overload recovery time MAX2035 toc07 output overload to 100mv p-p f = 5mhz differential input 200mv/div differential output 500mv/div channel-to-channel crosstalk vs. gain MAX2035 toc08 -65 -70 -75 -80 -85 -100 -95 -90 -60 -15 -5 5 15 25 35 45 crosstalk (db) gain (db) v out = 1.5v p-p differential f = 10mhz, adjacent channels -30 -110 1 10 100 channel-to-channel crosstalk vs. frequency -90 -100 MAX2035 toc09 frequency (mhz) crosstalk (db) -70 -80 -60 -50 -40 v out = 1v p-p differential gain = 20db , adjacent channels typical operating characteristics (continued) (figure 2, v cc = v ref = 4.75v to 5.25v, gnd = 0v, pd = 0, vg_clamp_mode = 1, f rf = 5mhz, capacitance to gnd at each of the vga differential outputs is 60pf, differential capacitance across the vga outputs is 10pf, r l = 1k ? , t a = 0 c to +70 c. typical val- ues are at v cc = v ref = 5v, v cm = 3.0v, t a = +25 c, unless otherwise noted.) second-harmonic distortion vs. gain MAX2035 toc04 -30 -40 -50 -60 -70 -100 -90 -80 -20 -10 0 -15 -5 5 15 25 35 45 hd2 (dbc) gain (db) f = 2mhz v out = 1v p-p differential f = 5mhz f = 12mhz third-harmonic distortion vs. gain MAX2035 toc05 -30 -40 -50 -60 -70 -100 -90 -80 -20 -10 0 -15-5 5 15253545 hd3 (dbc) gain (db) v out = 1v p-p differential f = 12mhz f = 5mhz f = 2mhz overload recovery time MAX2035 toc06 output overload to 1v p-p f = 5mhz differential input 200mv/div differential output 500mv/div
MAX2035 ultrasound variable-gain amplifier 6 _______________________________________________________________________________________ large-signal bandwidth vs. frequency MAX2035 toc13 40 35 30 25 20 15 10 5 0 0.1 10 100 1 1000 frequency (mhz) gain (db) v out = 1.5v p-p differential vg_ctl = -0.8v p-p differential large-signal bandwidth vs. frequency MAX2035 toc14 30 25 20 15 10 5 0 -5 -10 0.1 10 100 1 1000 frequency (mhz) gain (db) v out = 1.5v p-p differential vg_ctl = +0.2v p-p differential large-signal bandwidth vs. frequency MAX2035 toc15 20 15 10 5 0 -5 -10 -15 -20 0.1 10 100 1 1000 gain (db) v out = 1.5v p-p differential vg_ctl = +1.2v p-p differential frequency (mhz) large-signal bandwidth vs. frequency MAX2035 toc16 10 5 0 -5 -10 -15 -20 -25 -30 0.1 10 100 1 1000 gain (db) v out = 1.5v p-p differential vg_ctl = +1.7v p-p differential frequency (mhz) large-signal bandwidth vs. frequency MAX2035 toc17 0 -5 -10 -15 -20 -25 -30 -35 -40 0.1 10 100 1 1000 gain (db) v out = 1v p-p differential vg_ctl = +2v p-p differential frequency (mhz) harmonic distortion vs. differential output voltage MAX2035 toc18 -100 -70 -80 -90 -60 -50 -40 -30 -20 -10 0 01.0 0.5 1.5 2.0 2.5 3.0 differential output voltage (v p-p ) harmonic distortion (dbc) f = 5mhz, gain = 20db third harmonic second harmonic typical operating characteristics (continued) (figure 2, v cc = v ref = 4.75v to 5.25v, gnd = 0v, pd = 0, vg_clamp_mode = 1, f rf = 5mhz, capacitance to gnd at each of the vga differential outputs is 60pf, differential capacitance across the vga outputs is 10pf, r l = 1k ? , t a = 0 c to +70 c. typical val- ues are at v cc = v ref = 5v, v cm = 3.0v, t a = +25 c, unless otherwise noted.) output-referred noise voltage vs. gain MAX2035 toc10 80 70 60 50 40 30 -15 -5 5 15 25 35 45 output-referred noise voltage (nv/ hz) gain (db) f = 5mhz gain vs. differential analog control voltage (vg_ctl) MAX2035 toc11 -15 5 -5 25 15 35 45 -2.5 2.5 vg_ctl (v p-p differential) gain (db) -0.5 -1.5 0.5 1.5 f = 5mhz 50 45 40 35 30 25 20 15 10 0.1 10 100 1 1000 frequency (mhz) gain (db) large-signal bandwidth vs. frequency MAX2035 toc12 v out = 1.5v p-p differential vg_ctl = -2v p-p differential
MAX2035 ultrasound variable-gain amplifier _______________________________________________________________________________________ 7 two-tone ultrasound-specific imd3 vs. frequency MAX2035 toc22 -70 -20 -30 -40 -50 -60 -10 0 010 5152025 frequency (mhz) imd3 (dbc) v out = 1v p-p differential gain = 20db 0 10 5 25 20 15 30 35 45 40 50 -4.50 -3.00 -2.25 -3.75 -1.50 -0.75 0.75 1.50 2.25 3.00 3.75 4.50 gain error (db) % of units gain error histogram MAX2035 toc23 sample size = 188 units f in_ = 5mhz, gain = 20db -100 -75 -50 -25 0 25 50 75 100 -15 5 -5 15 25 35 45 gain (db) offset voltage (mv) output common-mode offset voltage vs. gain MAX2035 toc24 differential output impedance magnitude vs. frequency MAX2035 toc25 0.1 10 100 frequency (mhz) z out ( ? ) 1 200 60 80 100 120 140 180 160 harmonic distortion vs. differential output load resistance MAX2035 toc19 -100 -75 -80 -85 -90 -95 -70 -65 -60 -55 -50 -45 -40 200 800 500 1100 1400 1700 2000 differential output load ( ? ) harmonic distortion (dbc) v out = 1v p-p differential f = 5mhz, gain = 20db third harmonic second harmonic harmonic distortion vs. differential output load capacitance MAX2035 toc20 -100 -75 -80 -85 -90 -95 -70 -65 -60 -55 -50 -45 -40 545 25 65 85 105 differential output load (pf) harmonic distortion (dbc) v out = 1v p-p differential f = 5mhz, gain = 20db third harmonic second harmonic harmonic distortion vs. frequency MAX2035 toc21 -100 -50 -60 -70 -80 -90 -40 -30 -20 -10 0 020 10 30 40 50 frequency (mhz) harmonic distortion (dbc) v out = 1v p-p differential gain = 20db third harmonic second harmonic typical operating characteristics (continued) (figure 2, v cc = v ref = 4.75v to 5.25v, gnd = 0v, pd = 0, vg_clamp_mode = 1, f rf = 5mhz, capacitance to gnd at each of the vga differential outputs is 60pf, differential capacitance across the vga outputs is 10pf, r l = 1k ? , t a = 0 c to +70 c. typical val- ues are at v cc = v ref = 5v, v cm = 3.0v, t a = +25 c, unless otherwise noted.)
MAX2035 ultrasound variable-gain amplifier 8 _______________________________________________________________________________________ pin description pin name function 1, 2, 5, 6, 7, 10, 11, 12, 19, 20, 21, 24, 25, 26, 29, 30, 31, 34, 35, 36, 41, 43, 44, 45, 47, 48, 51, 55, 58, 59, 64, 65, 66, 69, 73, 76, 79, 80, 81, 83, 84, 85, 88?2, 96, 97, 98 gnd ground 3 vgin3- vga channel 3 inverting differential input 4 vgin3+ vga channel 3 noninverting differential input 8 vgin4- vga channel 4 inverting differential input 9 vgin4+ vga channel 4 noninverting differential input 13 ext_c1 external compensation. connect a 4.7? capacitor to ground. 14 ext_c2 external compensation. connect a 4.7? capacitor to ground. 15 ext_c3 external compensation. connect a 4.7? capacitor to ground. 16, 39, 42, 46, 54, 72, 82, 87 v cc 5v power supply. bypass each v cc supply to ground with 0.1? capacitors as close to the pins as possible. 17 vgin5- vga channel 5 inverting differential input 18 vgin5+ vga channel 5 noninverting differential input 22 vgin6- vga channel 6 inverting differential input 23 vgin6+ vga channel 6 noninverting differential input 27 vgin7- vga channel 7 inverting differential input 28 vgin7+ vga channel 7 noninverting differential input 32 vgin8- vga channel 8 inverting differential input 33 vgin8+ vga channel 8 noninverting differential input 37, 93 v ref 5v reference supply. bypass to gnd with a 0.1? capacitor as close to the pins as possible. note that noise performance of the device is dependent on the noise contribution from the supply to v ref . use a low-noise supply for v ref . v cc and v ref can be connected together to share the same supply voltage if the supply for v cc exhibits low noise. 38 ext_res external resistor. connect a 7.5k ? resistor to ground. 40 pd power-down switch. drive pd high to set the device in power-down mode. drive pd low for normal operation. 49 vgout8+ vga channel 8 noninverting differential output 50 vgout8- vga channel 8 inverting differential output 52 vgout7+ vga channel 7 noninverting differential output 53 vgout7- vga channel 7 inverting differential output 56 vgout6+ vga channel 6 noninverting differential output 57 vgout6- vga channel 6 inverting differential output 60 vgout5+ vga channel 5 noninverting differential output
MAX2035 ultrasound variable-gain amplifier _______________________________________________________________________________________ 9 pin description (continued) pin name function 61 vgout5- vga channel 5 inverting differential output 62 vg_ctl- vga analog gain-control inverting input 63 vg_ctl+ vga analog gain-control noninverting input 67 vgout4+ vga channel 4 noninverting differential output 68 vgout4- vga channel 4 inverting differential output 70 vgout3+ vga channel 3 noninverting differential output 71 vgout3- vga channel 3 inverting differential output 74 vgout2+ vga channel 2 noninverting differential output 75 vgout2- vga channel 2 inverting differential output 77 vgout1+ vga channel 1 noninverting differential output 78 vgout1- vga channel 1 inverting differential output 86 v g_c lamp _m od e v ga c l am p m od e e nab l e. d r i ve v g _c lam p _m od e l ow to enab l e v ga cl am p i ng . v g a outp ut w i l l b e cl am p ed at typ i cal l y 2.2v p - p d i ffer enti al . d r i ve v g_c lam p _m o d e hi g h to d i sab l e v g a cl am p m od e. 94 vgin1- vga channel 1 inverting differential input 95 vgin1+ vga channel 1 noninverting differential input 99 vgin2- vga channel 2 inverting differential input 100 vgin2+ vga channel 2 noninverting differential input ep exposed paddle. solder the exposed paddle to the ground plane using multiple vias. detailed description the MAX2035? vgas are optimized for high linearity, high dynamic range, and low output-noise perfor- mance, making this component ideal for ultrasound- imaging applications. the vga paths also exhibit a channel-to-channel crosstalk of -80db at 10mhz and an absolute gain error of less than ?.25db for minimal channel-to-channel focusing error in an ultrasound sys- tem. each vga path includes circuitry for adjusting analog gain, an output buffer with differential output ports (vgout_+, vgout_-) for driving adcs, and dif- ferential input ports (vgin_+, vgin_-) that are ideal for directly interfacing to the max2034 quad lna. see the functional diagram for details. the vga has an adjustable gain range from -10.5db to +39.5db, achieving a total dynamic range of typically 50db. the vga gain can be adjusted with the differen- tial gain-control input vg_ctl+ and vg_ctl-. set the differential gain-control input voltage at -2v for maxi- mum gain and +2v for minimum gain. the differential analog control common-mode voltage is typically 3.0v. vga clamp a clamp is provided to limit the vga output signals to avoid overdriving the adc or to prevent adc saturation. set vg_clamp_mode low to clamp the vga differential outputs at 2.2v p-p . set the vg_clamp_mode high to disable the clamp. power down the device can also be powered down with pd. set pd to logic-high for power-down mode. in power-down mode, the device draws a total supply current of 27ma. set pd to a logic-low for normal operation overload recovery the device is also optimized for quick overload recovery for operation under the large input signal conditions that are typically found in ultrasound input buffer imaging applications. see the typical operating characteristics for an illustration of the rapid recovery time from a trans- mit-related overload.
applications information external compensation external compensation is required for bypassing inter- nal biasing circuitry. connect, as close as possible, individual 4.7? capacitors from each pin ext_c1, ext_c2, and ext_c3 (pin 13, 14, 15) to ground. external bias resistor an external resistor at ext_res is required to set the bias for the internal biasing circuitry. connect, as close as possible, a 7.5k ? resistor from ext_res (pin 38) to ground. analog input and output coupling in typical applications, the MAX2035 is being driven from a low-noise amplifier (such as the max2034) and is typically driving a discrete differential anti-alias filter into an adc (such as the max1434 octal adc). the differential input impedance of the MAX2035 is typically 200 ? . the differential outputs are capable of driving a differential load resistance of 1k ? . the output imped- ance is 100 ? differential. the differential outputs have a common-mode bias of approximately 3v. ac-couple these differential outputs if the next stage has a differ- ent common-mode input range. ultrasound-specific imd3 specification unlike typical communications specs, the two input tones are not equal in magnitude for the ultrasound- specific imd3 two-tone specification. in this measure- ment, f 1 represents reflections from tissue and f 2 represents reflections from blood. the latter reflections are typically 25db lower in magnitude, and hence the measurement is defined with one input tone 25db lower than the other. the imd3 product of interest (f 1 - (f 2 - f 1 )) presents itself as an undesired doppler error signal in ultrasound applications. see figure 1. pcb layout the pin configuration of the MAX2035 is optimized to facilitate a very compact physical layout of the device and its associated discrete components. a typical application for this device might incorporate several devices in close proximity to handle multiple channels of signal processing. the exposed paddle (ep) of the MAX2035? tqfp-ep package provides a low thermal-resistance path to the die. it is important that the pc board (pcb) on which the MAX2035 is mounted be designed to conduct heat from the ep. in addition, provide the ep with a low- inductance path to electrical ground. the ep must be soldered to a ground plane on the pcb, either directly or through an array of plated via holes. MAX2035 ultrasound variable-gain amplifier 10 ______________________________________________________________________________________ -25db ultrasound imd3 f 1 - (f 2 - f 1 )f 2 + (f 2 - f 1 ) f 1 f 2 figure 1. ultrasound imd3 measurement technique
MAX2035 ultrasound variable-gain amplifier ______________________________________________________________________________________ 11 MAX2035 max2034 max1434 adc vg_ctl+ vg_ctl- vg_out_+ vg_out_- vgin_+ vgin_- single channel single channel vga 50 ? 100nf z in control d2, d1, d0 to a single channel of 100nf 50 ? 100nf 100nf 100nf 18nf 100nf v in -v +v figure 2. typical per-channel ultrasound-imaging application vgout8- vgout8+ gnd v cc gnd v cc gnd 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 gnd gnd gnd gnd v cc ext_res gnd gnd v ref gnd pd vgin8- gnd vgin7+ vgin7- gnd gnd vgin8+ vgout1- gnd gnd v cc gnd gnd vgin2+ vgout1+ gnd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 gnd gnd gnd vgin4+ gnd vgin3+ vgin3- gnd gnd vgout2+ gnd v cc vgout3- vgout3+ gnd vgout4- vgout4+ gnd gnd gnd vg_ctl+ vg_ctl- vgout5- gnd gnd vgout6- vgout6+ gnd v cc vgout7- vgout7+ gnd vgout2- MAX2035 top view gnd vg_clamp_mode v cc gnd gnd gnd gnd gnd gnd v ref vgin1- vgin1+ gnd gnd vgin2- gnd ext_c1 ext_c2 ext_c3 vgin5- gnd gnd gnd v cc gnd gnd vgin6- gnd gnd vgin5+ vgin6+ vgin4- vgout5+ tqfp + pin configuration
MAX2035 ultrasound variable-gain amplifier maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2006 maxim integrated products is a registered trademark of maxim integrated products, inc. package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) 100l,tqfp.eps package outline 21-0085 2 1 b 100l tqfp, 14x14x1.0mm package outline, 21-0085 2 2 b 100l tqfp, 14x14x1.0mm

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