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micropower precision cmos operational amplifier ad8500 rev. b 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 ?2006C2009 analog devices, inc. all rights reserved. features supply current: 1 a maximum offset voltage: 1 mv maximum single-supply or dual-supply operation rail-to-rail input and output no phase reversal unity gain stable applications portable equipment remote sensors low power filters threshold detectors current sensing pin configuration ad8500 top view (not to scale) out a 1 v? 2 +in 3 v+ ?in 5 4 06005-001 figure 1. 5-lead sc70 general description the ad8500 is a low power, precision cmos op amp featuring a maximum supply current of 1 a. the ad8500 has a maximum offset voltage of 1 mv and a typical input bias current of 1 pa; it operates rail-to-rail on both the input and output. the ad8500 can operate from a single-supply voltage of +1.8 v to +5.5 v or a dual-supply voltage of 0.9 v to 2.75 v. with its low power consumption, low input bias current, and rail-to-rail input and output, the ad8500 is ideally suited for a variety of battery-powered portable applications. potential applications include ecgs, pulse monitors, glucose meters, smoke and fire detectors, vibration monitors, and backup battery sensors. the ability to swing rail-to-rail at both the input and output helps maximize dynamic range and signal-to-noise ratio in systems that operate at very low voltages. the low offset voltage allows the ad8500 to be used in systems with high gain without having excessively large output offset errors, and it provides high accuracy without the need for system calibration. the ad8500 is fully specified over the industrial temperature range (?40c to +85c) and is operational over the extended industrial temperature range (?40c to +125c). it is available in a 5-lead, sc70 surface-mount package. table 1. low supply current op amps supply current 1 a 10 a 20 a single ad8500 dual ad8502 ada4505-2 ad8506 quad ad8504 ada4505-4 ad8508
ad8500 rev. b | page 2 of 12 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 pin configuration ............................................................................. 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 ....................................................................... 12 ordering guide .......................................................................... 12 revision history 2/09rev. a to rev. b added table 1; renumbered sequentially .................................... 1 changes to typical performance characteristics section ........... 6 8/06rev. 0 to rev. a updated format .................................................................. universal changes to figure 17, figure 18, and figure 19 ........................... 8 4/06revision 0: initial version
ad8500 rev. b | page 3 of 12 specifications electrical characteristics @ v s = 5 v, v cm = v s /2, t a = 25c, unless otherwise noted. table 2. parameter symbol conditions min typ max unit input characteristics offset voltage v os 0 v < v cm < 5 v 0.235 1 mv offset voltage drift ?v os /?t ?40c < t a < +85c 3 10 v/c input voltage range ?0.3 +5.3 v input bias current i b 1 10 pa ?40c < t a < +85c 100 pa ?40c < t a < +125c 600 pa input offset current i os 0.5 5 pa ?40c < t a < +85c 50 pa ?40c < t a < +125c 100 pa common-mode rejection ratio cmrr 0 v < v cm < 5 v 75 90 db ?40c < t a < +85c 70 90 db large signal voltage gain a vo 0.1 v < v out < 4.9 v 98 120 db 0.1 v < v out < 4.9 v; ?40c < t a < +85c 80 db input capacitance c diff 2 pf c cm 4.5 pf output characteristics output voltage high v oh r load = 100 k to gnd 4.970 4.995 v r load = 10 k to gnd 4.900 4.960 v output voltage low v ol r load = 100 k to v s 0.85 5 mv r load = 10 k to v s 6.5 15 mv short-circuit current i sc v out = gnd 5 ma power supply power supply rejection ratio psrr 1.8 v < v s < 5 v 90 110 db ?40c < t a < +85c 80 db supply current/amplifier i sy v o = v s /2 0.75 1 a ?40c < t a < +85c 1.5 a ?40c < t a < +125c 2 a dynamic performance slew rate sr 0.004 v/s gain bandwidth product gbp 7 khz phase margin ? o 60 degrees noise performance peak-to-peak noise 0.1 hz to 10 hz 6 v p-p voltage noise density e n f = 1 khz 190 nv/hz current noise density i n f = 1 khz 0.1 pa/hz
ad8500 rev. b | page 4 of 12 @ v s = 1.8 v, v cm = v s /2, t a = 25c, unless otherwise noted. table 3. parameter symbol conditions min typ max unit input characteristics offset voltage v os 0 v < v cm < 1.8 v 0.235 1 mv offset voltage drift ?v os /?t ?40c < t a < +85c 3.5 12 v/c input voltage range ?0.3 +2.1 v input bias current i b 1 10 pa ?40c < t a < +85c 100 pa ?40c < t a < +125c 600 pa input offset current i os 0.5 5 pa ?40c < t a < +85c 50 pa ?40c < t a < +125c 100 pa common-mode rejection ratio cmrr 0 v < v cm < 1.8 v 65 85 db ?40c < t a < +85c 60 83 db large signal voltage gain a vo 0.1 v < v out < 1.7 v 88 115 db 0.1 v < v out < 1.7 v; ?40c < t a < +85c 70 db input capacitance c diff 2 pf c cm 4.5 pf output characteristics output voltage high v oh r load = 100 k to gnd 1.790 1.798 v r load = 10 k to gnd 1.760 1.783 v output voltage low v ol r load = 100 k to v s 0.70 5 mv r load = 10 k to v s 5 15 mv short-circuit current i sc 2 ma power supply power supply rejection ratio psrr 1.8 v < v s < 5 v 90 110 db ?40c < t a < +85c 80 db supply current/amplifier i sy v o = v s /2 0.65 1 a ?40c < t a < +85c 1.5 a ?40c < t a < +125c 2 a dynamic performance slew rate sr 0.004 v/s gain bandwidth product gbp 7 khz phase margin ? o 60 degrees noise performance peak-to-peak noise 0.1 hz to 10 hz 6 v p-p voltage noise density e n f = 1 khz 190 nv/hz current noise density i n f = 1 khz 0.1 pa/hz
ad8500 rev. b | page 5 of 12 absolute maximum ratings t a = 25c, unless otherwise noted . table 4. parameter rating supply voltage 6 v input voltage v ss ? 0.4 v to v dd + 0.4 v differential input voltage 6 v output short-circuit duration to gnd indefinite storage temperature range ?65c to +150c operating temperature range ?40c to +125c junction temperature range ?65c to +150c lead temperature (soldering, 60 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. absolute maximum ratings apply at 25c, unless other- wise noted. thermal resistance ja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. table 5. thermal characteristics package type ja jc unit 5-lead sc70 (ks-5) 376 126 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.
ad8500 rev. b | page 6 of 12 0 0 0 typical performance characteristics t a = 25c, unless otherwise noted. 1200 800 1000 400 600 200 0 ?1000 ?750 750 ?500 500 ?250 250 01 number of amplifiers v os (v) 06005-002 v s = 5v 0v < v cm < 5v figure 2. input offset voltage distribution 12 4 6 0 2 8 10 number of amplifiers tcv os (v/c) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 06005-003 v s = 5v ?40c < t a < +85c figure 3. input offset voltage drift distribution 1000 ?1000 800 ?800 400 ?400 600 ?600 200 ?200 0 v os (v) v cm (v) 012345 06005-004 v s = 5v figure 4. input offset voltage vs. common-mode voltage ?40 ?20 0 20 40 60 80 100 120 1000 10 100 0.1 1 0.01 0.001 input bias current (pa) temperature (c) 06005-005 v s = 5v and 1.8v figure 5. input bias current vs. temperature 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 1000 10 100 0.1 1 0.01 0.001 input bias current (pa) v cm (v) 06005-006 i b (+85c) i b (+25c) i b (?40c) i b (+125c) v s = 5v figure 6. input bias current vs. common-mode voltage 0.5 0.6 0.7 0.8 0.9 1.0 70 30 40 50 60 20 10 0 number of amplifiers supply current (a) 06005-007 v s = 5v figure 7. supply current distribution
ad8500 rev. b | page 7 of 12 0.9 1.0 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0123456 i sy (a) v s (v) 0 06005-008 figure 8. supply current vs. supply voltage i sy (a) temperature (c) 0 0.2 0.4 0.6 0.8 1.0 1.2 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 06005-009 i sy at 5.0v i sy at 1.8v figure 9. supply current vs. temperature i sy (na) v cm (v) 600 650 700 750 800 850 900 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 06005-010 v s = 5v figure 10. supply current vs . input common-mode voltage 1000 100 10 1 0.1 0.01 0.001 0.01 0.1 1 output saturation voltage (mv) load current (ma) source sink 06005-011 v s = 5v figure 11. output saturation voltage vs. load current 100 10 1 0.1 ?40 10 ?15 35 60 85 output saturation voltage (mv) temperature (c) 06005-012 v ol @ 100k ? load v oh @ 100k ? load v ol @ 10k ? load v oh @ 10k ? load v s = 5v figure 12. output saturation voltage vs. temperature 80 60 40 20 0 ?20 ?40 ?60 ?80 120 90 60 30 0 ?30 ?60 ?90 ?120 10 100 1k 10k 100k open-loop gain (db) phase margin (degrees) frequency (hz) 06005-013 phase gain v s = 5v figure 13. open-loop gain and phase vs. frequency
ad8500 rev. b | page 8 of 12 0.01 0.1 1 10 100 cmrr (db) frequency (khz) 10 2 0 30 40 50 60 70 80 90 100 1 1 0 120 0 06005-014 v s = 5v figure 14. cmrr vs. frequency psrr (db) frequency (khz) 10 2 0 30 40 50 60 70 80 90 100 0.01 0.1 1 10 100 0 0 6005-015 v s = 5v figure 15. psrr vs. frequency 35 15 20 25 30 10 5 0 10 100 1000 overshoot (%) load capacitance (pf) os+ os? 06005-016 v s = 5v figure 16. small signal overshoot vs. load capacitance 0.20 ?0.20 0.15 ?0.15 0.10 ?0.10 0.05 ?0.05 0 ?0.0005 0 0.0005 0.0010 0.0015 voltage (v) time (seconds) 06005-017 v s = 5v no load figure 17. small signal transient response 0.20 ?0.20 0.15 ?0.15 0.10 ?0.10 0.05 ?0.05 0 ?0.0005 0 0.0005 0.0010 0.0015 voltage (v) time (seconds) 0 6005-018 v s = 5v c l = 100pf figure 18. small signal transient response 6 5 4 3 1 2 0 ?0.002 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0 ?0.001 0.008 voltage (v) time (seconds) 06005-019 v s = 5v no load figure 19. large signal transient response
ad8500 rev. b | page 9 of 12 voltage (2v/div) time (40s/div) v s v out gain = +1 v in = v s/2 06005-020 figure 20. turn-on transient response 4 3 2 1 0 ?1 ?2 ?3 ?4 ?0.005 ?0.003 ?0.001 0.001 0.003 0.005 0.007 0.009 voltage (v) time (s) v out v in 06005-021 v s = 5v figure 21. no phase reversal 4 2 0 1 3 ?1 ?2 ?4 ?3 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 5 peak-to-peak voltage (v) time (seconds) 06005-022 v s = 5v and 1.8v figure 22. 0.1 hz to 10 hz input voltage noise 1000 100 10 1 10 100 1k 10k voltage noise density (nv/ hz) frequency (hz) 06005-023 v s = 5v and 1.8v figure 23. voltage noise density ?1000 ?750 ?500 ?250 0 250 500 750 1000 500 300 400 200 100 0 number of amplifiers v os (v) 06005-024 v s = 1.8v 0v < v cm < 1.8v figure 24. input offset voltage distribution 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 12 8 2 6 10 4 0 number of amplifiers tcv os (v/c) 06005-025 v s = 1.8v ?40c < t a < +85c figure 25. input offset voltage drift distribution
ad8500 rev. b | page 10 of 12 1000 ?1000 ?800 ?600 ?400 ?200 0 200 400 600 800 0 0.3 0.6 0.9 1.2 1.5 1.8 v os (v) v cm (v) 06005-026 v s = 1.8v figure 26. input offset voltage vs. input common-mode voltage 1000 100 10 1 0.1 0.01 0.001 0 0.3 0.6 0.9 1.2 1.5 1.8 i b (pa) v cm (v) 06005-027 i b (+125c) i b (+25c) i b (?40c) i b (+85c) v s = 1.8v figure 27. input bias current vs. input common-mode voltage 70 60 50 40 30 20 10 0 number of amplifiers supply current (a) 0.5 0.4 0.6 0.7 0.8 0.9 0 6005-028 v s = 1.8v figure 28. supply current distribution i sy (na) v cm (v) 600 550 500 650 700 0 0.30.60.91.21.51.8 06005-029 v s = 1.8v figure 29. supply current vs . input common-mode voltage 1000 100 10 1 0.01 0.1 0.001 0.01 0.1 1 output saturation voltage (mv) load current (ma) source sink 06005-030 v s = 1.8v figure 30. output saturation voltage vs. load current 100 10 1 0.1 ?40 ?15 10 35 85 60 output saturation voltage (mv) temperature (c) 06005-031 v oh @ 10k ? load v ol @ 10k ? load v oh @ 100k ? load v ol @ 100k ? load v s = 1.8v figure 31. output saturation voltage vs. temperature
ad8500 rev. b | page 11 of 12 open-loop gain (db) phase margin (degrees) frequency (hz) ?80 ?60 ?40 ?20 0 20 40 60 80 30 0 ?30 ?60 ?90 ?120 60 90 120 10 100 1k 10k 100k 06005-032 v s = 1.8v phase gain figure 32. open-loop gain and phase vs. frequency 100 90 80 70 60 50 40 30 20 10 0 0.01 0.1 1 10 100 cmrr (db) frequency (khz) 06005-033 v s = 1.8v figure 33. cmrr vs. frequency 35 30 25 20 15 10 5 0 10 100 1000 overshoot (%) load capacitance (pf) os? os+ 06005-034 v s = 1.8v figure 34. small signal overshoot vs. load capacitance 0.20 0.15 ?0.15 0.10 ?0.10 0.05 ?0.05 0 ?0.20 ?0.0005 0 0.0005 0.0010 0.0015 voltage (v) time (seconds) 06005-035 v s = 1.8v no load figure 35. small signal transient response 0.20 0.15 ?0.15 0.10 ?0.10 0.05 ?0.05 0 ?0.20 0 0.0005 0.0010 0.0015 voltage (v) time (seconds) 0 6005-036 ?0.0005 v s = 1.8v c l = 100pf figure 36. small signal transient response 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0 0.2 ?0.002 ?0.001 0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 voltage (v) time (seconds) 06005-037 v s = 1.8v no load figure 37. large signal transient response
ad8500 rev. b | page 12 of 12 compliant to jedec standards mo-203-aa outline dimensions 0.30 0.15 0 . 1 0 m a x 1.00 0.90 0.70 0.46 0.36 0.26 seating plane 0.22 0.08 1.10 0.80 4 5 123 pin 1 0.65 bsc 2.20 2.00 1.80 2.40 2.10 1.80 1.35 1.25 1.15 0.10 coplanarity 0.40 0.10 figure 38. 5-lead thin shrink small outline transistor package [sc70] (ks-5) dimensions shown in millimeters ordering guide model temperature range package desc ription package option branding ad8500aksz-r2 1 ?40c to +125c 5-lead sc70 ks-5 a0f ad8500aksz-reel 1 ?40c to +125c 5-lead sc70 ks-5 a0f ad8500aksz-reel7 1 ?40c to +125c 5-lead sc70 ks-5 a0f 1 z = rohs compliant part. ?2006C2009 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d06005-0-2/09(b)

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