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ultra precision, 36 v, 2.8 nv/hz dual rail-to-rail out p ut o p am p ad8676 rev. 0 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 very low voltage noise 2.8 nv/hz @ 1 khz rail-to-rail output swing low input bias current: 2 na maximum very low offset voltage: 12 v typical low input offset drift: 0.6 v/c maximum very high gain: 120 db wide bandwidth: 10 mhz typical 5 v to 18 v operation applications precision instrumentation pll filters laser diode control loops strain gage amplifiers medical instrumentation thermocouple amplifiers pin configurations out a 1 ?in a 2 +in a 3 v? 4 v+ 8 out b 7 ?in b 6 +in b 5 ad8676 top view (not to scale) 06487-001 figure 1. 8-lead soic_n (r-8) out a 1 ?in a 2 +in a 3 v? 4 v+ 8 out b 7 ?in b 6 +in b 5 ad8676 top view (not to scale) 06487-002 figure 2. 8-lead msop (rm-8) general description the ad8676 precision operational amplifier offers ultralow offset, drift, and voltage noise combined with very low input bias currents over the full operating temperature range. the ad8676 is a precision, wide bandwidth op amp featuring rail-to- rail output swings and very low noise. operation is fully specified from 5 v to 15 v. the ad8676 features a rail-to-rail output like that of the op184, but with wide bandwidth and even lower voltage noise, com- bined with the precision and low power consumption like that of the industry-standard op07 amplifier. unlike other low noise, rail-to-rail op amps, the ad8676 has very low input bias current and low input current noise. with typical offset voltage of only 12 v, offset drift of 0.2 v/c, and noise of only 0.10 v p-p (0.1 hz to 10 hz), the ad8676 is perfectly suited for applications where large error sources cannot be tolerated. precision instrumentation, pll and other precision filter circuits, position and pressure sensors, medical instrumentation, and strain gage amplifiers benefit greatly from the very low noise, low input bias current, and wide bandwidth. many systems can take advantage of the low noise, dc precision, and rail-to-rail output swing provided by the ad8676 to maxi- mize snr and dynamic range. the smaller packages and low power consumption afforded by the ad8676 allow maximum channel density or minimum board size for space-critical equipment. the ad8676 is specified for the extended industrial temperature range (?40c to +125c). the ad8676 is available in the 8-lead msop, and the popular 8-lead, narrow soic; both of which are lead-free packages. msop packaged devices are only available in tape and reel format. for the single version of this ultraprecision rail-to-rail op amp, see the ad8675 data sheet.
ad8676 rev. 0 | page 2 of 12 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 pin configurations ........................................................................... 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 electrical specifications ............................................................... 3 absolute maximum ratings ............................................................5 thermal resistance .......................................................................5 power sequencing .........................................................................5 esd caution ...................................................................................5 typical performance characteristics ..............................................6 outline dimensions ....................................................................... 10 ordering guide .......................................................................... 10 revision history 10/06revision 0: initial version
ad8676 rev. 0 | page 3 of 12 specifications electrical specifications v s = 5.0 v, v cm = 0 v, v o = 0 v, t a = +25c, unless otherwise specified. table 1. parameter symbol conditions min typ max unit input characteristics offset voltage v os b grade (soic) 12 50 v b grade (msop) 60 v a grade (soic, msop) 100 v offset voltage v os ?40c t a +125c b grade (soic, msop) 15 160 v a grade (soic, msop) 250 v input bias current i b ?2 +0.5 +2 na ?40c t a +125c ?5.5 +1 +5.5 na input offset current i os ?1 +0.1 +1 na ?40c t a +125c ?2.8 +0.1 +2.8 na input voltage range ?3.5 +3.5 v common-mode rejection ratio cmrr v cm = ?3.0 v to +3.0 v 105 130 db ?40c t a +125c 105 130 db open-loop gain a vo r l = 2 k to ground, 1000 2000 v/mv v o = ?3.5 v to +3.5 v ?40c t a +125c 700 1250 v/mv offset voltage drift v os /t ?40c t a +125c 0.2 0.6 v/c output characteristics output voltage high v oh r l = 2 k to ground +4.84 +4.86 v ?40c t a +125c +4.78 +4.82 v output voltage low v ol r l = 2 k to ground ?4.95 ?4.86 v ?40c t a +125c ?4.93 ?4.82 v short-circuit limit i sc +40 ma output current i o 20 ma power supply power supply rejection ratio psrr v s = 5.0 v to 15.0 v 106 120 db ?40c t a +125c 106 120 db supply current/amplifier i sy v o = 0 v 2.3 2.7 ma ?40c t a +125c 2.7 3.4 ma dynamic performance slew rate sr r l = 2 k 2.5 v/s gain bandwidth product gbp 10 mhz noise performance voltage noise e n p-p 0.1 hz to 10 hz 0.1 v p-p voltage noise density e n f = 1 khz 2.8 nv/hz current noise density i n f = 10 hz 0.3 pa/hz
ad8676 rev. 0 | page 4 of 12 v s = 15 v, v cm = 0 v, v o = 0 v, t a = +25c, unless otherwise specified. table 2. parameter symbol conditions min typ max unit input characteristics offset voltage v os b grade (soic) 12 50 v b grade (msop) 60 v a grade (soic, msop) 100 v offset voltage v os ?40c t a +125c b grade (soic, msop) 15 160 v a grade (soic, msop) 250 v input bias current i b ?2 ?0.5 +2 na ?40c t a +125c ?4.5 ?1 +4.5 na input offset current i os ?1 ?0.1 +1 na ?40c t a +125c ?2.8 ?0.1 +2.8 na input voltage range ?13.5 +13.5 v common-mode rejection ratio cmrr v cm = ?12.5 v to +12.5 v 111 130 db ?40c t a +125c 107 130 db open-loop gain a vo r l = 2 k to ground, 1500 4000 v/mv v o = ?13.5 v to +13.5 v ?40c t a +125c 700 1700 v/mv offset voltage drift v os /t ?40c t a +125c 0.2 0.6 v/c output characteristics output voltage high v oh r l = 2 k to ground +14.65 +14.7 v ?40c t a +125c +14.49 +14.59 v output voltage low v ol r l = 2 k to ground ?14.88 ?14.75 v ?40c t a +125c ?14.83 ?14.69 v short-circuit limit i sc +40 ma output current i o 20 ma power supply power supply rejection ratio psrr v s = 5.0 v to 15.0 v 106 120 db ?40c t a +125c 106 120 db supply current/amplifier i sy v o = 0 v 2.5 2.9 ma ?40c t a +125c 2.9 3.8 ma dynamic performance slew rate sr r l =10 k 2.5 v/s gain bandwidth product gbp 10 mhz noise performance voltage noise e n p-p 0.1 hz to 10 hz 0.1 v p-p voltage noise density e n f = 1 khz 2.8 nv/hz current noise density i n f = 10 hz 0.3 pa/hz
ad8676 rev. 0 | page 5 of 12 absolute maximum ratings table 3. parameter rating supply voltage 18 v input voltage v supply ? 1.5 v differential input voltage 0.7 v output short-circuit duration to gnd indefinite storage temperature range rm, r packages ?65c to +150c operating temperature range ?40c to +125c junction temperature range rm, r packages ?65c to +150c lead temperature range (soldering, 10 sec) 300c 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 for extended periods may affect device reliability. thermal resistance table 4. thermal resistance package type ja jc unit 8-lead msop (rm) 210 45 c/w 8-lead soic_n (r) 158 43 c/w power sequencing the op amp supplies must be established simultaneously with, or before, any input signals are applied. if this is not possible, the input current must be limited to 10 ma. esd caution
ad8676 rev. 0 | page 6 of 12 typical performance characteristics 15 v and 5 v, t a = 25c, unless otherwise specified. 10 9 8 7 6 5 4 3 2 1 0 1 10 100 1k 10k 100k frequency (hz) voltage noise density (nv/ hz) 06487-003 figure 3. voltage noise density vs. frequency 90 0 ?100 ?80 ?60 ?40 ?20 0 20 40 60 80 100 v os (v) number of amplifiers 80 70 60 50 40 30 20 10 06487-004 t a = 25c figure 4. input offset voltage distribution 25 20 15 10 5 0 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 1.00 0.65 0.70 0.75 0.80 0.85 0.90 0.95 t c v os (v/c) number of amplifiers 06487-005 figure 5. t c v os distribution 150 ?150 ?45 135 temperature (c) v os (v) 100 50 0 ?50 ?100 ?30 ?15 0 15 30 45 60 75 90 105 120 06487-006 figure 6. offset voltage vs. temperature 120 0 ?0.65 06487-007 i b (na) number of amplifiers 100 80 60 40 20 ?0.55 ?0.45 ?0.35 ?0.25 ?0.15 ?0.05 0.05 figure 7. input bias current, v sy = 15 v 160 0 ? 0.65 06487-008 i b (na) number of amplifiers 140 120 100 80 60 40 20 ? 0.60 ? 0.55 ? 0.50 ? 0.45 ? 0.40 ? 0.35 ? 0.30 ? 0.25 ? 0.20 ? 0.15 figure 8. input bias current, v sy = 5 v
ad8676 rev. 0 | page 7 of 12 5 4 3 2 1 0 ?1 ?2 ?3 ?4 ?5 ?40 ?20 0 20 40 60 80 100 120 temperature (c) i b (na) v sy = 5v v sy = 15v 06487-009 figure 9. input bias current vs. temperature 3.0 2.5 2.0 1.5 1.0 0.5 0 5 1015202530 35 supply voltage (v) supply current (ma) 06487-010 figure 10. supply current vs. total supply voltage 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 ?40 ?20 0 20 40 60 80 100 120 temperature (c) supply current (ma) v s = 15v v s = 5v 06487-011 figure 11. supply current vs. temperature 100 120 100 80 40 60 20 ?40 ?20 0 ?80 ?100 ?60 ?120 10k 1k 100k 10m 1m 100m frequency (hz) gain (db) r l = 2k ? c l = 35pf m = 55.2 gain phase 180 120 60 ?60 0 ?120 ?180 phase margin (degrees) 06487-012 figure 12. gain and phase vs. frequency 60 50 40 30 20 10 0 ?10 ?20 ?30 ?40 1k 10k 100k g = 1 g = 10 g = 100 1m 10m 100m frequency (hz) closed-loop gain (db) 06487-013 figure 13. closed-loop gain vs. frequency 70 60 50 40 30 20 10 0 1k 10k 100k 1m 10m 100m frequency (hz) z out ( ? ) a vo = 100 a vo = 10 a vo = 1 06487-014 figure 14. z out vs. frequency
ad8676 rev. 0 | page 8 of 12 15 10 5 0 ?5 ?10 ?15 time (10s/div) voltage (v) v in = 10v r l = 2k ? a v = +1 06487-015 figure 15. large signal transient response, v sy = 15 v 4 3 2 1 0 ?1 ?3 ?2 ?4 time (10s/div) voltage (v) v in = 3.5v r l = 2k ? a v = +1 06487-016 figure 16. large signal transient response, v sy = 5 v 70 60 50 40 30 20 10 0 1 10 100 1k 10k 100k capacitance (pf) overshoot (%) a v = +1 v in = 100mv p-p +os ?os 06487-017 figure 17. small signal overshoot vs. load capacitance 0.1 0 ?0.1 ?0.2 ?0.3 ?0.4 ?0.5 ?0.6 ?0.7 ?4 1 6 11 16 21 26 31 36 time (s) input voltage (v) 50 40 30 20 10 0 ?10 ?30 ?20 output voltage (v) v in = 200mv p-p a vo = ?100 r l = 10k ? v in v out 06487-018 figure 18. positive overvoltage recovery 0.3 0.2 0.1 0 ?0.1 ?0.2 ?0.3 ?0.4 ?0.5 ?4 1 6 11 16 21 26 31 36 time (s) input voltage (v) 50 40 30 20 10 0 ?10 ?20 ?30 output voltage (v) v in = 200mv p-p a vo = ?100 r l = 10k ? v in v out 06487-019 figure 19. negative overvoltage recovery 180 160 140 120 100 80 60 40 20 0 ?20 10 100 10k 1k 100k 10m 1m 100m frequency (hz) cmrr (db) 06487-020 figure 20. cmrr vs. frequency
ad8676 rev. 0 | page 9 of 12 160 140 120 100 60 80 20 40 0 ?20 10 100 10k 1k 100k 10m 1m 100m frequency (hz) power supply rejection ratio (db) ?psrr +psrr 06487-021 figure 21. power supply reje ction ratio vs. frequency 148 147 146 145 144 143 142 141 140 ?40 ?20 0 20 40 60 80 100 120 temperature (c) power supply rejection ratio (db) 06487-022 figure 22. power supply rejection ratio vs. temperature 0.06 0.04 0.02 0 ?0.02 ?0.04 ?0.06 012 4 37 6 58 9 time (s) noise (v) 1 0 0 6487-023 figure 23. voltage noise (0.1 hz to 10 hz) 1000 100 10 1 0.001 0.01 0.1 1 10 100 load current (ma) v s ? v out (mv) t a = 25c source sink 06487-024 figure 24. output saturation voltage vs. output load current 14.86 14.84 14.82 14.80 14.78 14.76 14.74 14.72 14.70 ?40 ?20 0 20 40 60 80 100 120 temperature (c) +swing (v) v oh v sy = 15v r l = 2k ? 06487-025 figure 25. +swing vs. temperature, v oh ? 14.70 ?14.75 ?14.80 ?14.85 ?14.90 ?14.95 ?15.00 ?40 ?20 0 20 40 60 80 100 120 temperature (c) ?swing (v) v sy = 15v r l = 2k ? v ol 06487-026 figure 26. ?swing vs. temperature, v ol
ad8676 rev. 0 | page 10 of 12 outline dimensions controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. compliant to jedec standards ms-012-a a 060506-a 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 4 1 85 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) bsc 6.20 (0.2440) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarity 0.10 figure 27. 8-lead standard small outline package [soic_n] narrow body (r-8) dimensions shown in millimeters and (inches) compliant to jedec standards mo-187-aa 0.80 0.60 0.40 8 0 4 8 1 5 pin 1 0.65 bsc seating plane 0.38 0.22 1.10 max 3.20 3.00 2.80 coplanarity 0.10 0.23 0.08 3.20 3.00 2.80 5.15 4.90 4.65 0.15 0.00 0.95 0.85 0.75 figure 28. 8-lead mini small outline package [msop] (rm-8) dimensions shown in millimeters ordering guide model temperature range package description package option branding AD8676ARMZ-R2 1 ?40c to +125c 8-lead mini small outline package [msop] rm-8 a13 ad8676armz-reel 1 ?40c to +125c 8-lead mini small outline package [msop] rm-8 a13 ad8676arz 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 ad8676arz-reel 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 ad8676arz-reel7 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 ad8676brmz-r2 1 ?40c to +125c 8-lead mini small outline package [msop] rm-8 a1l ad8676brmz-reel 1 ?40c to +125c 8-lead mini small outline package [msop] rm-8 a1l ad8676brz 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 ad8676brz-reel 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 ad8676brz-reel7 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 1 z = pb-free part.
ad8676 rev. 0 | page 11 of 12 notes
ad8676 rev. 0 | page 12 of 12 notes ?2006 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d05564-0-10/06(0)

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