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36 v precision, 2.8 nv/hz rail-to-rail output op amp ad8675 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 ? 2005 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, 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 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 instru- mentation, 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 msop-8, and the popular 8-lead, narrow soic, lead- free packages. msop packaged devices are only available in tape and reel format.
ad8675 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 esd caution...................................................................................5 typical performance characteristics ..............................................6 outline dimensions ....................................................................... 11 ordering guide .......................................................................... 11 revision history 10/05revision 0: initial version
ad8675 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 10 75 v ?40c t a +125c 12 240 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 ?3.5 3.5 v common-mode rejection ratio cmrr v cm = ?3.5 v to +3.5 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 = ?4.0 v to +4.0 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 4.86 4.90 v ?40c t a +125c 4.82 4.85 v output voltage low v ol r l = 2 k to ground ?4.91 ?4.86 v ?40c t a +125c ?4.91 ?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 120 140 db ?40c t a +125c 120 140 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
ad8675 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 units input characteristics offset voltage v os 10 75 v ?40c t a +125c 12 240 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 114 130 db ?40c t a +125c 114 130 db open loop gain a vo r l = 2 k to ground, 1500 4000 v/mv v o = ?14.0 v to 14.0 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 soic r l = 2 k to ground 14.75 14.8 v msop 14.67 14.78 v soic ?40c t a +125c 14.69 14.75 v msop ?40c t a +125c 14.3 14.66 v output voltage low v ol r l = 2 k to ground ?14.85 ?14.75 v ?40c t a +125c ?14.78 ?14.69 v v v short-circuit limit i sc 40 ma ma output current i o 20 ma ma power supply power supply rejection ratio psrr v s = 5.0 v to 15.0 v 120 140 db ?40c t a +125c 120 140 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 vp-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. 0 | page 5 of 12 absolute maximum ratings table 3 . parameter rating supply voltage 18 v input voltage v supply 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 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.
ad8675 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 05564-011 frequency (hz) voltage noise density (nv/ hz) figure 3. voltage noise density vs. frequency 50 45 40 25 30 35 20 15 10 5 0 ?30 ?25 ?20 ?15 ?10 ?5 0 5 10 15 20 25 30 35 40 45 50 05564-016 offset voltage ( v) number of amplifiers 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 05564-014 t c v os ( v/ c) number of amplifiers figure 5. tcvos 150 100 50 0 ?100 ?50 ?150 ?200 ?40 25 125 05564-005 temperature ( c) offset voltage ( v) figure 6. offset voltage vs. temperature 120 100 80 60 40 20 0 ?0.7 ?0.6 ?0.6 ?0.5 ?0.5 ?0.4 ?0.4 ?0.3 ?0.3 ?0.2 ?0.2 ?0.1 ?0.1 0 0.1 0.1 0.2 0.2 0.3 0.3 0.3 0.4 0.4 0.5 0.5 0.6 0.6 05564-008 i b (na) number of amplifiers figure 7. input bias current, v sy = 15 v 160 120 140 100 80 60 40 20 0 ?0.7 ?0.6 ?0.6 ?0.5 ?0.5 ?0.4 ?0.4 ?0.3 ?0.3 ?0.2 ?0.2 ?0.1 ?0.1 0 0.1 0.1 0.2 0.2 0.3 0.3 0.3 0.4 0.4 0.5 0.5 0.6 0.6 05564-027 i b (na) number of amplifiers figure 8. input bias current, v sy = 5 v
ad8675 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 05564-007 temperature ( c) i b (na) v sy = 5v v sy = 15v figure 9. input bias current vs. temperature 3.0 2.5 2.0 1.5 1.0 0.5 0 5 1015202530 35 05564-009 supply voltage (v) supply current (ma) 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 05564-019 temperature ( c) i sy (ma) v s = 15v v s = 5v 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 05564-018 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) 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 05564-030 frequency (hz) closed-loop gain (db) figure 13. closed-loop gain vs. frequency 70 60 50 40 30 20 10 0 1k 10k 100k 1m 10m 100m 05564-015 frequency (hz) z out ( ) a vo = 100 a vo = 10 a vo = 1 figure 14. z out vs. frequency
ad8675 rev. 0 | page 8 of 12 15 10 5 0 ?5 ?10 ?15 05564-020 time (10 s/div) voltage (v) v in = 11v r l = 2k a v = +1 figure 15. large signal transient response, v sy = 15 v 4 3 2 1 0 ?1 ?3 ?2 ?4 05564-028 time (10 s/div) voltage (v) v in = 3.5v r l = 2k a v = +1 figure 16. large signal transient response, v sy = 5 v 70 60 50 40 30 20 10 0 1 10 100 1k 10k 100k 05564-012 capacitance (pf) overshoot (%) a v = +1 v in = 100mv p-p +os ?os 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 05564-004 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 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 05564-003 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 figure 19. negative overvoltage recovery 180 160 140 120 100 80 60 40 20 0 ?20 10 100 10k 1k 100k 10m 1m 100m 05564-029 frequency (hz) cmrr (db) figure 20. cmrr vs. frequency
ad8675 rev. 0 | page 9 of 12 160 140 120 100 60 80 20 40 0 ?20 10 100 10k 1k 100k 10m 1m 100m 05564-022 frequency (hz) psrr (db) ?psrr +psrr figure 21. psrr vs. frequency 148 147 146 145 144 143 142 141 140 ?40 ?20 0 20 40 60 80 100 120 05564-023 temperature ( c) psrr (db) 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 10 05564-021 time (s) noise (v) figure 23. voltage noise (0.1 hz to 10 hz) 1000 100 10 1 0.001 0.01 0.1 1 10 100 05564-010 load current (ma) v s ? v out (mv) t a = 25 c source sink 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 05564-032 temperature ( c) +swing (v) v oh v sy = 15v r l = 2k 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 05564-033 temperature ( c) ?swing (v) v sy = 15v r l =2k v ol figure 26. swing vs. temperature, v ol
ad8675 rev. 0 | page 10 of 12 1 8 4 7 3 6 2 ad8675 inpu t output v+ v os trim range is typically 3.5mv 100k v? ? + 05564-031 figure 27. optional o ffset nulling circuit
ad8675 rev. 0 | page 11 of 12 outline dimensions 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 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 figure 28. 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 29. 8-lead mini small outline package [msop] (rm-8) dimensions shown in millimeters ordering guide model temperature range package description package option branding ad8675armz-r2 1 ?40c to +125c 8-lead mini small outline package [msop] rm-8 a08 AD8675ARMZ-REEL 1 ?40c to +125c 8-lead mini small outline package [msop] rm-8 a08 ad8675arz 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 ad8675arz-reel 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 ad8675arz-reel7 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 1 z = pb-free part.
ad8675 rev. 0 | page 12 of 12 notes ? 2005 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d05564-0-10/05(0)

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