octal ultrasound afe with jesd204b preliminary technical data AD9675 rev. pr b information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its us e. specifications subject to change without notice. no license is granted by implication or otherwise unde r any patent or patent rights of analog devices. trademarks and registered trademarks are the proper ty of their respective owners. one technology way, p.o. box 9106, norwood, ma 0206 29106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ? analog devices, inc. all rights reserved. features 8 channels of lna, vga, aaf, adc, and digital rf de cimator low power: 150 mw per channel, tgc mode, 40 msps; 65mw per channel, cw mode; <30mw at powerup 10 mm 10 mm, 144ball cspbga tgc channel inputreferred noise: 0.8 nv/ hz, max gain flexible powerdown modes fast recovery from low power standby mode: <2 s overload recovery: <10 ns low noise preamplifier (lna) inputreferred noise: 0.78 nv/hz, gain = 21.6 db programmable gain: 15.6 db/17.9 db/21.6 db 0.1 db compression: 1000 mv pp/750 mv pp/450 mv p p flexible active input impedance matching variable gain amplifier (vga) attenuator range: 45db, linearindb gain control postamp gain (pga): 21 db/24 db/27 db/30 db antialiasing filter (aaf) programmable secondorder lpf from 8 mhz to 18 mhz or 13.5mhz to 30mhz and hpf analogtodigital converter (adc) snr: 75db, 14 bits up to 125 msps jesd204b subclass 0 coded serial digital outputs cw mode harmonic rejection i/q demodulator individual programmable phase rotation output dynamic range per channel: >160 dbc/hz outputreferred snr: 156 dbc/hz, 1 khz offset, ?3d bfs rf digital highpass filter and decimation by 2 general description the AD9675 is designed for low cost, low power, sma ll size, and ease of use for medical ultrasound. it contains eight channels of a variable gain amplifier (vga) with a low noise preamplifier (lna), a cw harmonic rejection i/q dem odulator with programmable phase rotation, an anti-aliasing filter (aaf), an analog-to-digital converter (adc), a digi tal high- pass filter and an rf decimation by 2. each channel features a maximum gain of up to 52 db , a fully differential signal path, and an active input pream plifier termination. the channel is optimized for high dyna mic performance and low power in applications where a s mall package size is critical. the lna has a single-ended-to-differential gain tha t is selectable through the spi. assuming a 15 mhz noise bandwidth (nbw) and a 21.6 db lna gain, the lna input snr is 94 db. in cw doppler mode, each lna output drives an i/q demodul ator that has independently programmable phase rotation with 16 phase settings. power-down of individual channels is supported to i ncrease battery life for portable applications. standby mod e allows quick power-up for power cycling. in cw doppler operation , the vga, aaf, and adc are powered down. the adc contain s several features designed to maximize flexibility a nd minimize system cost, such as a programmable clock, data ali gnment, and programmable digital test pattern generation. the d igital test patterns include built-in fixed patterns, built-in pseudo random patterns, and custom user-defined test patterns ent ered via the serial port interface. gain- c l k - c l k + s d i o s c l k c s b r b i a s v r e f avdd1 pwdn stdby dvdd r e s e t - avdd2 gain+ g p o [ 0 - 3 ] a d d r [ 0 - 4 ] t x _ t r i g + m l o - m l o + r e s e t + t x _ t r i g - drvdd figure 1.
AD9675 preliminary technical data rev. prb | page 2 of 2 notes ?2013 analog devices, inc. all rights reserved. tra demarks and registered trademarks are the property of their re spective owners. pr1138102/13(prb)
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