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16 v, 250 a, dual precision, cmos, rail-to-rail output operational amplifier ad8667 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 ?2007 analog devices, inc. all rights reserved. features lower power at high voltage: 180 a typical low offset voltage: 100 v voltage noise 21 nv/hz at 10 khz 23 nv/hz at 1 khz low input bias current: 300 fa single-supply operation: 5 v to 16 v dual-supply operation: 2.5 v to 8 v output drive: 10 ma unity gain stable applications medical equipment physiological measurement precision references buffer/level shifting portable operated systems high density power budget systems multipole filters sensors photodiode amplification adc drivers pin configuration out a 1 ?in a 2 +in a 3 v? 4 v+ 8 out b 7 ?in b 6 +in b 5 06276-001 ad8667 top view (not to scale) figure 1. 8-lead msop, 8-lead soic general description the ad8667 is a dual, rail-to-rail output, single-supply/dual-supply amplifier that uses analog devices, inc. patented digitrim? trimming technique to achieve low offset voltage, 300 v over the common-mode range. the ad8667 features an extended operating range with supply voltages up to 16 v for low power operation with an i sy of <325 a per amplifier over temperature. the device is designed for low noise at higher voltages: 21 nv/hz at 10 khz and 23 nv/hz at 1 khz. it also features a low input bias current of 300 fa and a 10 ma output drive. the combination of low supply currents, low offsets, very low input bias currents, and wide supply range makes the ad8667 ideal for a wide variety of low power applications. systems utilizing dc-to-low frequency measurements or high impedance sensors, such as photodiodes, benefit from the low input bias current, low noise, low offset, and low drive current. the wide operating voltage range matches todays high performance adcs and dacs. medical monitoring equipment can take advantage of the low voltage noise, high input impedance, low voltage, and low current noise. the ad8667 is specified over the extended industrial temperature range of ?40c to +125c.
ad8667 rev. 0 | page 2 of 16 table of contents features .............................................................................................. 1 applications....................................................................................... 1 pin configuration............................................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications..................................................................................... 3 electrical characteristics............................................................. 3 absolute maximum ratings ............................................................5 thermal resistance .......................................................................5 esd caution...................................................................................5 typical performance characteristics ..............................................6 outline dimensions ....................................................................... 13 ordering guide .......................................................................... 13 revision history 5/07revision 0: initial version
ad8667 rev. 0 | page 3 of 16 specifications electrical characteristics v s = 5.0 v, v cm = v s /2, t a = 25c unless otherwise noted. table 1. parameter symbol test conditions/comments min typ max unit input characteristics offset voltage v os v cm = 2.5 v 100 v ?40c < t a < +125c 350 v v cm = 0 v to 3.5 v 70 300 v ?40c < t a < +85c 100 450 v v cm = 0.2 v to 3.5 v, ?40c < t a < +125c 100 450 v input bias current i b 0.3 pa ?40c < t a < +85c 20 pa ?40c < t a < +125c 150 pa input offset current i os 0.2 pa ?40c < t a < +85c 15 pa ?40c < t a < +125c 50 pa input voltage range ivr ?40c < t a < +85c 0 3.5 v ?40c < t a < +125c 0.2 3.5 v common-mode rejection ratio cmrr v cm = 0 v to 3.5 v 80 90 db v cm = 0.2 v to 3.5 v, ?40c < t a < +125c 80 90 db large signal voltage gain a vo r l = 2 k, v o = 0.5 v to 4.5 v 106 115 db offset voltage drift v os /t ?40c < t a < +125c 1.3 5 v/c output characteristics output voltage high v oh i l = 1 ma 4.65 4.8 v ?40c < t a < +125c 4.6 4.7 v output voltage low v ol i l = 1 ma 150 200 mv ?40c < t a < +125c 200 250 mv short-circuit current i sc 6 ma closed-loop output impedance z out f = 100 khz, a v = 1 120 power supply power supply rejection ratio psrr v s = 5 v to 16 v 95 105 db supply current/amplifier i sy 180 275 a ?40c < t a < +125c 325 a dynamic performance slew rate sr r l = 2 k 0.2 v/s settling time t s to 0.1%, 0 v to 2 v step, a v = 10 12 s gain bandwidth product gbp 600 khz phase margin m 60 degrees noise performance peak-to-peak noise e n p-p f = 0.1 hz to 10 hz 3 v p-p voltage noise density e n f = 10 khz 21 nv/hz f = 1 khz 23 nv/hz current noise density i n f = 1 khz 0.05 pa/hz
ad8667 rev. 0 | page 4 of 16 v s = 16 v, v cm = v s /2, t a = 25c unless otherwise noted. table 2. parameter symbol test conditions/comments min typ max unit input characteristics offset voltage v os v cm = 8 v 40 300 v ?40c < t a < +125c 350 v v cm = 0 v to 14.5 v 70 300 v ?40c < t a < +85c 450 v v cm = 0.2 v to 14.5 v, ?40c < t a < +125c 450 v input bias current i b 0.3 pa ?40c < t a < +85c 30 pa ?40c < t a < +125c 250 pa input offset current i os 0.2 pa ?40c < t a < +85c 25 pa ?40c < t a < +125c 150 pa input voltage range ivr ?40c < t a < +85c 0 14.5 v ?40c < t a < +125c 0.2 14.5 v common-mode rejection ratio cmrr v cm = 0 v to 14.5 v 90 100 db v cm = 0.2 v to 14.5 v, ?40c < t a < +125c 90 100 db large signal voltage gain a vo r l = 2 k, v o = 0.5 v to 15.5 v 112 124 db offset voltage drift v os /t 1.2 5 v/c output characteristics output voltage high v oh i l = 1 ma 15.8 15.9 v i l = 10 ma 14.8 15.1 v i l = 10 ma, ?40c < t a < +125c 14.65 14.8 v output voltage low v ol i l = 1 ma 80 100 mv i l = 10 ma 600 720 mv i l = 10 ma, ?40c < t a < +125c 800 900 mv short-circuit current i sc 50 ma closed-loop output impedance z out f = 100 khz, a v = 1 100 power supply power supply rejection ratio psrr v s = 5 v to 16 v, ?40c < t a < +125c 95 105 db supply current/amplifier i sy 230 285 a ?40c < t a < +125c 325 a dynamic performance slew rate sr r l = 2 k 0.3 v/s settling time t s to 0.1%, 0 v to 2 v step 12 s gain bandwidth product gbp 600 khz phase margin m 60 degrees noise performance peak-to-peak noise e n p-p f = 0.1 hz to 10 hz 3 v p-p voltage noise density e n f = 1 khz 23 nv/hz f = 10 khz 21 nv/hz current noise density i n f = 1 khz 0.05 pa/hz
ad8667 rev. 0 | page 5 of 16 absolute maximum ratings table 3. parameter rating supply voltage 18 v input voltage ?0.1 v to v s differential input voltage 18 v output short-circuit duration to gnd indefinite storage temperature range ?60c to +150c lead temperature (soldering, 60 sec) 300c operating temperature range ?40c to +125c junction temperature range ?65c to +150c 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 ja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. table 4. thermal resistance package type ja jc unit 8-lead msop 145 45 c/w 8-lead soic 125 43 c/w esd caution
ad8667 rev. 0 | page 6 of 16 typical performance characteristics specifications at v sy = 8 v, unless otherwise noted. 1600 1400 1200 1000 800 600 400 200 0 0 50 100 150 200 250 ?50?100 ?150 ?200 ?250 number of amplifiers v os (v) 06276-003 v s = 8v 0v < v cm < 14.5v t a = 25c figure 2. input offset voltage distribution 40 35 30 25 20 15 10 5 0 number of amplifiers 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 tcv os (v/c) 06276-004 v s = 8v ?40c < t a < +125c figure 3. input offset voltage drift distribution 300 250 200 150 100 50 0 ?50 ?100 ?150 ?200 ?250 ?300 v os (s) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 v cm (v) 06276-005 v s = 16v 0v < v cm < 14.5v t a = 25c figure 4. input offset voltage vs. common-mode voltage 100 10 1 0.1 input bias current (pa) 0 25 50 75 100 125 temperature (c) 06276-006 8v 2.5v figure 5. input bias current vs. temperature 10000 1000 100 10 1 0.1 output voltage to supply rail (mv) 0.001 0.01 0.1 1 10 load current (ma) source sink 06276-007 v s = 5v t a = 25c figure 6. output swing saturation voltage vs. load current 10000 1000 100 10 1 0.1 output voltage to supply rail (mv) 0.001 0.01 0.1 1 10 100 load current (ma) 06276-008 source sink v s = 16v t a = 25c figure 7. output swing saturation voltage vs. load current
ad8667 rev. 0 | page 7 of 16 1200 1100 1000 900 800 700 600 500 400 300 200 100 0 output saturation voltage (mv) ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 temperature (c) v dd ? v oh @ 10ma v s = 16v v dd ? v oh @ 1ma v s = 16v v dd ? v oh @ 1ma v s = 5v v ol @ 1ma v s = 5v v ol @ 10ma v s = 16v 06276-009 v ol @ 1ma v s = 16v figure 8. output saturati on voltage vs. temperature 150 100 50 0 ?50 ?100 ?150 i b (pa) 0246810121416 v cm (v) v s = 16v t a = 125c 06276-010 figure 9. input bias current vs. common mode voltage at 125c 90 70 50 30 10 ?10 ?30 ?50 ?70 ?90 gain (db) 135 90 45 0 ?45 ?90 ?135 phase (degrees) 1k 10k 100k 1m 10m frequency (hz) 06276-011 v sy = 16v phase gain figure 10. open-loop gain and phase shift vs. frequency 1200 1000 800 600 400 200 0 z out ( ? ) 1k 10k 100k 1m 10m frequency (hz) 06276-012 v sy = 8v a v = 100 a v = 10 a v = 1 figure 11. closed-loop outp ut impedance vs. frequency 120 100 80 60 40 20 cmrr (db) 100 1k 10k 100k 1m 10m frequency (hz) v s = 8v 06276-013 figure 12. cmrr vs. frequency psrr (db) 100 1k 10k 100k 1m 10m frequency (hz) v s = 8v 06276-014 100 90 80 70 60 50 40 30 20 10 0 psrr+/psrr? cha psrr+ psrr? figure 13. psrr vs. frequency
ad8667 rev. 0 | page 8 of 16 60 50 40 30 20 10 0 overshoot (%) 500 capacitance (pf) os+ os? 06276-015 10 100 v sy = 8v r l = 10k ? figure 14. small signal overshoot vs. load capacitance 600 500 400 300 200 100 0 i sy (a) ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 temperature (c) 16v 5v 06276-016 figure 15. supply current vs. temperature 06276-017 2.0 1.5 1.0 0.5 0 ?0.5 ?1.0 ?1.5 ?2.0 voltage (v/div) 012345678910 time (1s/div) v sy = 8v figure 16. 0.1 hz to 10 hz input voltage noise 06276-018 v sy = 8v a v = 1 c l = 200pf r l = 10k ? time (2s/div) voltage (50mv/div) figure 17. small signal transient response 06276-019 v sy = 8v a v = 1 c l = 200pf r l = 2k ? time (20s/div) voltage (2v/div) figure 18. large signal transient response 06276-020 v sy = 8v a v = ?100 time (20s/div) input voltage (50mv/div) output voltage (5v/div) 0.15 0.10 0.05 0 ?0.05 ?0.10 ?0.15 ?0.20 ?0.25 27 22 17 12 7 2 ?3 ?8 ?13 input voltage output voltage figure 19. positive overload recovery
ad8667 rev. 0 | page 9 of 16 06276-021 v sy = 8v a v = ?100 time (20s/div) input voltage (50mv/div) output voltage (5v/div) 0.05 0 ?0.05 ?0.10 ?0.15 ?0.20 ?0.25 ?0.30 ?0.35 35 30 25 20 15 10 5 0 ?5 input voltage output voltage figure 20. negative overload recovery 1000 100 10 voltage noise density (nv/ hz) 1 10 100 1000 frequency (hz) v sy = 8v 06276-022 figure 21. voltage noise density vs. frequency +125c ?40c +25c +85c 0 550 500 450 400 50 100 150 200 250 300 350 600 i sy (a) 0 2 4 6 8 10121416 v sy (v) v s = 0v to 8v, ?40c < t a < +125c 06276-023 figure 22. supply current vs. supply voltage 10k 1k 100 10 1 z out ( ? ) 100 1k 10k 100k 1m frequency (hz) 06276-024 v sy = 8v a v = 100 a v = 10 a v = 1 figure 23. closed-loop output impedance vs. frequency 06276-025 0 ?20 ?40 ?60 ?80 ?100 ?120 ?140 ?160 channel separation (db) 100 1k 10k 100k frequency (hz) v sy = 8v 20k ? 2k? figure 24. channel separation vs. frequency
ad8667 rev. 0 | page 10 of 16 specifications at v sy =2.5 v, unless otherwise noted. 1600 1400 1200 1000 800 600 400 200 0 0 50 100 150 200 250 ?50?100 ?150 ?200 ?250 number of amplifiers 06276-026 v os (v) v sy = 2.5v v s =+5v ?0.1v < v cm < +3.5v t a =25c figure 25. input offset voltage distribution 40 35 30 25 20 15 10 5 0 number of amplifiers 012345 tcv os (v) 06276-027 v sy = 2.5v ?40c < t a < 125c figure 26. input offset voltage drift distribution 150 100 50 0 ?50 ?100 ?150 ?200 v os (s) v cm (v) 06276-028 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 v sy = 2.5v 0v < v cm <+3.5v t a = 25c figure 27. input offset voltage vs. common-mode voltage 120 100 80 60 40 20 0 ?20 ?40 ?60 ?80 ?100 ?120 gain (db) 135 90 45 0 ?45 ?90 ?135 phase (degrees) 1k 10k 100k 1m 10m frequency (hz) 06276-029 v sy = 2.5v figure 28. open-loop gain and phase shift vs. frequency 60 40 20 0 ?20 ?40 closed-loop gain (db) 100 1k 10k 100k 1m 10m frequency (hz) 06276-030 v sy = 2.5v a v = 100 a v = 10 a v = 1 figure 29. closed-loop gain vs. frequency 10k 1k 100 10 1 z out ( ? ) 100 1k 10k 100k 1m frequency (hz) 06276-031 a v = 100 a v = 10 a v = 1 v sy = 2.5v figure 30. closed-loop outp ut impedance vs. frequency
ad8667 rev. 0 | page 11 of 16 cmrr (db) 100 1k 10k 100k 1m 10m frequency (hz) 06276-032 140 120 100 80 60 40 20 0 v sy = 2.5v figure 31. cmrr vs. frequency psrr (db) 100 1k 10k 100k 1m 10m frequency (hz) 06276-033 100 90 80 70 60 50 40 30 20 10 0 v sy = 2.5v psrr+ psrr? figure 32. psrr vs. frequency 80 70 60 50 40 30 20 10 0 overshoot (%) 10 100 500 capacitance (pf) os+ os? 06276-034 v sy = 2.5v r l = 10k ? figure 33. small signal overshoot vs. load capacitance 06276-035 2.0 1.5 1.0 0.5 0 ?0.5 ?1.0 ?1.5 ?2.0 voltage (v/div) 012345678910 time (1s/div) v sy = 2.5v figure 34. 0.1 hz to 10 hz input voltage noise 06276-036 v sy = 2.5v a v = 1 c l = 200pf r l = 10k ? time (2s/div) voltage (50mv/div) figure 35. small signal transient response 06276-037 v sy = 2.5v a v = 1 c l = 200pf r l = 2k ? time (10s/div) voltage (20mv/div) figure 36. large signal transient response
ad8667 rev. 0 | page 12 of 16 06276-040 1000 100 10 0 voltage noise density (nv/ hz) 1 10 100 1k frequency (hz) v sy = 2.5v 06276-038 v sy = 2.5v a v = ?100 time (20s/div) input voltage (50mv/div) output voltage (1v/div) 0.15 0.10 0.05 0 ?0.05 ?0.10 ?0.15 ?0.20 ?0.25 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 ?0.5 ?1.0 ?1.5 ?2.0 ?2.5 ?3.0 ?3.5 input voltage output voltage figure 37. positive overload recovery figure 39. voltage noise density vs. frequency 06276-041 0 ?20 ?40 ?60 ?80 ?100 ?120 ?140 ?160 channel separation (db) 100 1k 10k 100k frequency (hz) v sy = 2.5v 20k ? 2k? 06276-039 v sy = 2.5v a v = ?100 time (20s/div) input voltage (50mv/div) output voltage (1v/div) 0.05 0 ?0.05 ?0.10 ?0.15 ?0.20 ?0.25 ?0.30 ?0.35 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 ?0.5 ?1.0 input voltage output voltage figure 40. channel separation vs. frequency figure 38. negative overload recovery
ad8667 rev. 0 | page 13 of 16 outline dimensions 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 41. 8-lead mini small outline package [msop] (rm-8) dimensions shown in millimeters 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 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 42. 8-lead standard small outline package [soic_n] narrow body (r-8) dimensions shown in millimeters and (inches) ordering guide model temperature range package description package option branding AD8667ARMZ-R2 1 ?40c to +125c 8-lead mini small outline package [msop] rm-8 a1e ad8667armz-reel 1 ?40c to +125c 8-lead mini small outline package [msop] rm-8 a1e ad8667arz 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 ad8667arz-reel 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 ad8667arz-reel7 1 ?40c to +125c 8-lead standard small outline package [soic_n] r-8 1 z = rohs compliant part.
ad8667 rev. 0 | page 14 of 16 notes
ad8667 rev. 0 | page 15 of 16 notes
ad8667 rev. 0 | page 16 of 16 notes ?2007 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d06276-0-5/07(0)

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