dual & quad precision, low power high speed jfet preliminary technical data ad8682/AD8684 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 ? 2006 analog devices, inc. all rights reserved. features low supply current: 250 a/amp max high slew rate: 9v/ s bandwidth: 4 mhz typical low offset voltage: 1mv max low input bias current: 100 pa maximum cmrr: 90db fast settling time unity gain stable applications portable telecom low power industrial & instrumentation loop filters active & precision filters integrators strain gage amplifiers portable medical instrumentation supply current monitoring pin configurations 00301-002 out a 1 ?in a 2 +in a 3 v? 4 v+ 8 out b 7 ?in b 6 +in b 5 op282 top view (not to scale) soic-8 lead, & msop-8 lead soic-14 lead & tssop-14 general description the ad8682 and AD8684 are dual low power, precision (1mv) jfet amplifier featuring excellent speed at low supply currents. the slew rate is typically 9v/ s with a supply current under 250 a per amplifier. these unity-gain stable amplifiers have a typical gain bandwidth of 4 mhz. the jfet input stage ensures bias current is typically a few picoamps and below 500pa over the full temperature operating range. the devices are ideal for portable, low power applications, especially with high source impedance. the device is unity gain stable and can drive higher cap loads (g=1, non-inverting) as an example of its excellent dynamic response over a wide range of conditions, delivering dc precision performance at low quiescent currents. 4 .com u datasheet
ad8682/AD8684 preliminary technical data rev. pra | page 2 of 3 specifications electrical characteristics (@ v s = 15.0 v, v cm = 0 v, t a = 25c unless otherwise noted.) table 1. parameter symbol conditions min typ max unit input characteristics offset voltage v os 1 mv input bias current i b v cm = 0 v 100 pa 0c t a +70c 100 pa C40c t a +85c 500 pa input offset current i os v cm = 0 v 50 pa C40c t a +85c 250 pa input voltage range -11 +15 v common-mode rejection ratio cmrr -11 < v cm < +15 v, C40c t a +85c 70 90 db large signal voltage gain a vo r l = 10 k 20 v/mv r l = 10 k, ?40 v t a +85c 15 v/mv bias current drift i b /t 8 pa/c offset voltage drift v os /t C40c t a +85c 10 v/c output characteristics output voltage high v oh r l = 10 k 13.5 13.9 v output voltage low v ol r l = 10 k -13.9 -13.5 v short-circuit limit i sc source 3 10 ma sink -12 -8 ma open-loop output impedance i out f = 1 mhz 200 power supply power supply rejection ratio psrr v s = 4.5 v to 18 v, ?40c t a +85c 25 316 v/v supply current/amplifier i sy v o = 0 v, ?40c t a +85c 210 250 a supply voltage range v s v s = 18 v, ?40c t a +85c 4.5 18 v dynamic performance slew rate sr r l = 10 k 7 9 v/s settling time t s to 0.01% 125 khz full-power bandwidth bw p 1% distortion 1.6 s gain bandwidth product gbp 4 mhz phase margin ?o 55 degrees noise performance voltage noise e n p-p 0.1 hz to 10 hz 1.3 v p-p voltage noise density e n f = 1 khz 30 nv/hz current noise density i n 0.01 pa/hz 4 .com u datasheet
preliminary technical data ad8682/AD8684 rev. pra | page 3 of 3 notes ? 2006 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. pr06278-0-6/06(pra) 4 .com u datasheet
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