dual-channel audio difference amplifier preliminary technical data AD8273 rev. pra 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 use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2007 analog devices, inc. all rights reserved. features two gain settings: gain of 1/2 ( ? 6 db) gain of 2 (6 db) 0.03% max gain accuracy 10 ppm max gain drift excellent ac specifications 25v/s slew rate 0.9 s to 0.01% settling time low distortion 0.003% at 1 khz high accuracy dc performance 90 db typ cmrr 250 uv max offset voltage 14 lead soic package supply current: 2.5 ma per channel supply range: 2.5 v to 18 v applications high performance audio instrumentation amplifier building block level translator automatic test equipment sin/cos encoders general description the AD8273 is a low distortion, dual-channel amplifier with internal gain setting resistors. with no external components, it can be configured as a high performance difference amplifier (g=0.5 or 2), inverting amplifier (g=0.5 or 2) or non-inverting amplifier (g=1.5 or 3). the AD8273 operates on both single and dual supplies and only requires 2.5 ma maximum supply current for both amplifiers. it is specified over the industrial temperature range of ?40c to +85c and is fully rohs compliant. functional block diagram + ? ?in1 +in1 sense1 ref1 out1 + ? ?in2 +in2 sense2 ref2 out2 2 3 12 13 14 6 5 10 9 8 +v s ?v s 11 4 6k ? 12k ? 12k ? 12k ? 12k ? 6k ? 6k ? 6k ? figure 1. AD8273 dual difference amplifier table 1. difference amplifiers by category low distortion high voltage single supply uni-directional single supply bi-directional ad8270 AD8273 amp03 ad628 ad629 ad8212 ad8202 ad8203 ad8205 ad8206 ad8210
AD8273 preliminary technical data rev. pra| page 2 of 4 specifications v s = 18 v, v ref = 0 v, t a = 25c, g = 1/2, r l = 2 k, unless otherwise noted. table 2. parameter conditions min typ max unit dynamic performance bandwidth 12 mhz slew rate 25 v/s settling time to 0.1% 10v step on output, c l =100 pf 0.7 s settling time to 0.01% 10v step on output, c l =100 pf 0.9 s channel separation f = 1 khz 130 db noise/distortion 1 thd + noise f = 1 khz, v in = 10 vrms 0.003 % noise floor, rto 20 khz bw -120 dbu 2 output voltage noise (referred to input) f = 20 hz to 20 khz 3 vrms f = 1 khz 20 nv/hz gain gain error 0.03 % gain drift 1 10 ppm/c gain nonlinearity 10 ppm input characteristics offset 3 200 400 v vs. temperature 2 v/c vs. power supply 5 20 v/v common mode rejection ratio v cm =18v, r s =0 ? , referred to input 77 86 db input voltage range -vs-0.5 +v s +0.5 v impedance differential 24 k common mode 4 9 k output characteristics output swing -vs+1.5 + v s -1.5 v short circuit current limit 60 ma capacitive load drive 100 pf power supply supply current (per amplifier) 2.5 ma temperature range specified performance -40 85 1 includes amplifier voltage noise, resistor network voltage noise, and amplifier current noise through resistor network 2 dbu = 20log(vrms/0.7746) 3 includes effects of amplifiers input b ias and offset currents 4 calculated looking into both inputs. common mo de impedance looking into only one input is 18 k ?
preliminary technical data AD8273 rev. pra| page 3 of 4 absolute maximum ratings table 3. parameter rating supply voltage tbd output short-circuit current indefinite input voltage (common mode) tbd differential input voltage tbd storage temperature range ?65c to +130c specified temperature range ?40c to +85c thermal resistance ja 120 c/w thermal resistance jc 36 c/w package glass transition temperature (t g ) 130c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions may affect device reliability. maximum power dissipation the maximum safe power dissipation for the AD8273 is limited by the associated rise in junction temperature (t j ) on the die. at approximately 130 c, which is the glass transition temperature, the plastic changes its properties. even temporarily exceeding this temperature limit may change the stresses that the package exerts on the die, permanently shifting the parametric performance of the amplifiers. exceeding a temperature of 130c for an extended period can result in a loss of functionality. esd caution esd (electrostatic discharge) sensitive device. electros tatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge wi thout detection. although this product features proprietary esd protection circuitry, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality.
AD8273 preliminary technical data rev. pra| page 4 of 4 outline dimensions figure 2. 14 lead narrow body soic package ?2007 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. pr06981-0-8/07(pra)
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