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36 v precision, 2.8 nv/hz rail-to-rail output op amp ad8675 rev. c 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 ?2005C2010 analog devices, inc. all rights reserved. features very low voltage noise: 2.8 nv/hz rail-to-rail output swing low input bias current: 2 na maximum very low offset voltage: 75 v maximum 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 null 1 ?in 2 +in 3 v? 4 null 8 v+ 7 out 6 nc 5 nc = no connect ad8675 top view (not to scale) 05564-001 figure 1. 8-lead soic_n (r-8) null 1 ?in 2 +in 3 v? 4 null 8 v+ 7 out 6 nc 5 nc = no connect ad8675 top view (not to scale) 05564-002 figure 2. 8-lead msop (rm-8) general description the ad8675 precision operational amplifier has ultralow offset, drift, and voltage noise combined with very low input bias currents over the full operating temperature range. the ad8675 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 ad8675 features a rail-to-rail output like that of the op184 , but with wide bandwidth and even lower voltage noise, combined 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 ad8675 has very low input bias current and low input current noise. with typical offset voltage of only 10 v, offset drift of 0.2 v/c, and noise of only 0.10 v p-p (0.1 hz to 10 hz), the ad8675 is perfectly suited for applications where large error sources cannot be tolerated. for applications with even lower offset tolerances, the proprietary nulling capability allows a combination of both device and system offset errors up to 3.5 mv (referred to the input) to be compensated externally. unlike previous circuits, the ad8675 accommodates this adjustment without adversely affecting the offset drift, cmrr, and psrr of the amplifier. 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 ad8675 to maximize snr and dynamic range. the smaller packages and low power consumption afforded by the ad8675 allow maximum channel density or minimum board size for space-critical equipment. the ad8675 is specified for the extended industrial temperature range (?40c to +125c). the ad8675 amplifier is available in the tiny 8-lead msop, and the popular 8-lead, narrow soic, rohs compliant packages. msop packaged devices are only available in tape and reel format. for the dual version of this ultr aprecision, rail-to-rail op amp, see the ad8676 data sheet. the ad8675 and ad8676 are members of a growing series of low noise op amps offered by analog devices, inc. table 1. voltage noise package 0.9 nv 1.1 nv 1.8 nv 2.8 nv 3.8 nv single ad797 ad8597 ada4004-1 ad8675 ad8671 dual ad8599 ada4004-2 ad8676 ad8672 quad ada4004-4 ad8674
ad8675 rev. c | 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 ? esd caution...................................................................................5 ? typical performance characteristics ..............................................6 ? test circuit .................................................................................. 11 ? outline dimensions ....................................................................... 12 ? ordering guide .......................................................................... 12 ? revision history 6/10rev. b to rev. c changes to figure 10 ........................................................................ 7 5/10rev. a to rev. b changes to general description section ...................................... 1 added table 1; renumbered sequentially .................................... 1 changes to table 2 ............................................................................ 3 changes to table 3 ............................................................................ 4 changes to table 4 and table 5 ....................................................... 5 changes to figure 4 and figure 6 to figure 8 ............................... 6 changes to figure 15 ........................................................................ 8 changes to figure 21 and figure 24 ............................................... 9 added figure 27; renumbered sequentially .............................. 10 updated outline dimensions ....................................................... 12 changes to ordering guide .......................................................... 12 4/07rev. 0 to rev. a added figure 7 and figure 8; renumbered sequentially ........... 6 10/05revision 0: initial version
ad8675 rev. c | 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 2. parameter symbol test conditions/comments min typ max unit input characteristics offset voltage v os 10 75 v ?40c t a +125c 12 240 v offset voltage drift v os /t ?40c t a +125c 0.2 0.6 v/c input bias current i b ?2 +0.5 +2 na ?40c t a +125c ?5.5 ?2 +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 ivr ?3.0 +3.0 v common-mode rejection ratio cmrr v cm = ?3.0 v to +3.0 v 105 130 db ?40c t a +125c 105 db open-loop gain a vo r l = 2 k to ground, 120 126 db v o = ?3.5 v to +3.5 v ?40c t a +125c 117 db output characteristics output voltage high v oh r l = 10 k to ground 4.90 4.95 v ?40c t a +125c 4.85 v r l = 2 k to ground 4.80 4.90 v ?40c t a +125c 4.75 v output voltage low v ol r l = 10 k to ground ?4.98 ?4.90 v ?40c t a +125c ?4.85 v r l = 2 k to ground ?4.91 ?4.86 v ?40c t a +125c ?4.82 v short-circuit limit i sc 35 ma power supply power supply rejection ratio psrr v s = 5.0 v to 15.0 v 120 140 db ?40c t a +125c 120 db supply current/amplifier i sy v o = 0 v 2.3 2.7 ma ?40c t a +125c 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
ad8675 rev. c | page 4 of 12 v s = 15 v, v cm = 0 v, v o = 0 v, t a = +25c, unless otherwise specified. table 3. parameter symbol test conditions/comments min typ max unit input characteristics offset voltage v os 10 75 v ?40c t a +125c 12 240 v offset voltage drift v os /t ?40c t a +125c 0.2 0.6 v/c 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 ivr ?12.5 +12.5 v common-mode rejection ratio cmrr v cm = ?12.5 v to +12.5 v 114 130 db ?40c t a +125c 114 db open-loop gain a vo r l = 2 k to ground, 123 132 db v o = ?13.5 v to +13.5 v ?40c t a +125c 117 db output characteristics output voltage high v oh r l = 10 k to ground 14.85 14.92 v ?40c t a +125c 14.80 v r l = 2 k to ground 14.60 14.80 v ?40c t a +125c 14.40 v output voltage low v ol r l = 10 k to ground ?14.96 ?14.94 v ?40c t a +125c ?14.90 v r l = 2 k to ground ?14.85 ?14.75 v ?40c t a +125c ?14.69 v short-circuit limit i sc 35 ma power supply power supply rejection ratio psrr v s = 5.0 v to 15.0 v 120 140 db ?40c t a +125c 120 db supply current/amplifier i sy v o = 0 v 2.5 2.9 ma ?40c t a +125c 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
ad8675 rev. c | page 5 of 12 absolute maximum ratings thermal resistance table 4. parameter rating supply voltage 18 v input voltage v supply input current 5 ma differential input voltage 0.7 v output short-circuit duration to gnd indefinite storage temperature range rm-8, r-8 packages ?65c to +150c operating temperature range ?40c to +125c junction temperature range rm-8, r-8 packages ?65c to +150c lead temperature range (soldering, 10 sec) 300c null pins (pin 1, pin 8), input current maximum <50 a, v s < v+ ja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages and measured using a standard 4-layer board, unless otherwise specified. table 5. thermal resistance package type ja jc unit 8-lead msop (rm-8) 142 45 c/w 8-lead soic_n (r-8) 120 45 c/w esd caution 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.
ad8675 rev. c | 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) 05564-011 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 05564-016 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 05564-014 figure 5. t c v os 150 ?150 ?40 temperature (c) v os (v) 100 50 0 ?50 ?100 ?20 120 10080 60 4020 0 05564-005 v s = 15v typical figure 6. offset voltage vs. temperature 350 300 250 200 150 100 50 0 i b (na) number of amplifiers 2.01.61.2 0.8 0.4 0 ?2.0 ?1.6 ?1.2 ?0.8 ?0.4 05564-006 figure 7. input bias current, v s = 15 v 2.01.61.2 0.8 0.4 0 ?2.0 ?1.6 ?1.2 ?0.8 ?0.4 350 300 250 200 150 100 50 0 i b (na) number of amplifiers 05564-008 figure 8. input bias current, v s = 5 v
ad8675 rev. c | 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 s = 5v v s = 15v 05564-007 figure 9. input bias current vs. temperature 2.4 2.0 1.6 1.2 0.8 0.4 0 03 supply current (ma) supply voltage (v) 05564-009 6 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 t a = 25c r l = 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) i sy (ma) v s = 15v v s = 5v 05564-019 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) 05564-018 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) 05564-030 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 05564-015 figure 14. z out vs. frequency
ad8675 rev. c | 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 05564-020 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 05564-028 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 05564-012 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 05564-004 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 05564-003 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) 05564-029 figure 20. cmrr vs. frequency
ad8675 rev. c | page 9 of 12 140 120 100 80 60 40 20 0 10 100 1k 10k 100k 1m 10m 100m frequency (hz) psrr (db) 05564-022 psrr+ psrr? 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) psrr (db) 05564-023 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 05564-021 figure 23. voltage noise (0.1 hz to 10 hz) 10k 1k 100 10 1 0.001 0.01 0.1 1 10 100 load current (ma) v s ? v out (mv) 05564-010 sink source figure 24. output saturation voltage vs. output 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 s = 15v r l = 2k ? 05564-032 figure 25. swing vs. temperature, v oh ? 14.70 ?14.75 ?14.80 ?14.85 ?14.90 ?14.95 ?15.00 ?40?200 20406080100120 temperature (c) ?swing (v) v s = 15v r l =2k ? v ol 05564-033 figure 26. swing vs. temperature, v ol
ad8675 rev. c | page 10 of 12 0.01 0.001 0.0001 0.00001 10 100 1k 10k 100k frequency (hz) distortion (%) 05564-024 r l = 2k ? v in = 1v rms a v = +1 bw = 80khz v s = 5v v s = 15v figure 27. distortion vs. frequency
ad8675 rev. c | page 11 of 12 test circuit 1 8 4 7 3 6 2 ad8675 input output v+ v os trim range is typically 3.5mv 100k ? v? ? + 0 5564-031 figure 28. optional o ffset nulling circuit
ad8675 rev. c | page 12 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-aa 012407-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 (0.2441) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarity 0.10 figure 29. 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 100709-b 6 0 0.80 0.55 0.40 4 8 1 5 0.65 bsc 0.40 0.25 1.10 max 3.20 3.00 2.80 coplanarity 0.10 0.23 0.09 3.20 3.00 2.80 5.15 4.90 4.65 pin 1 identifier 15 max 0.95 0.85 0.75 0.15 0.05 figure 30. 8-lead mini small outline package [msop] (rm-8) dimensions shown in millimeters ordering guide model 1 temperature range package description package option branding AD8675ARMZ ?40c to +125c 8-lead mini small outline package [msop] rm-8 a08 AD8675ARMZ-reel ?40c to +125c 8-lead mini small outline package [msop] rm-8 a08 ad8675arz ?40c to +125c 8-lead standard small outline package [soic_n] r-8 ad8675arz-reel ?40c to +125c 8-lead standa rd small outline package [soic_n] r-8 ad8675arz-reel7 ?40c to +125c 8-lead stan dard small outline package [soic_n] r-8 1 z = rohs compliant part. ?2005C2010 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d05564-0-6/10(c)

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