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low power, precision auto-zero op amp ad8538 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 pin configuration diagrams low offset voltage: 13 v maximum out 1 v? 2 +in 3 v+ 5 ?in 4 ad8538 top view (not to scale) 05624-002 input offset drift: 0.03 v/c single-supply operation: 2.7 v to 5.5 v high gain, cmrr, and psrr low input bias current: 25 pa figure 1. 5-lead tsot-23 (uj-5) low supply current: 180 a applications nc 1 ? in 2 +in 3 v ? 4 nc 8 v+ 7 out 6 nc 5 nc = no connect ad8538 top view (not to scale) 05624-001 mobile communications portable instrumentation battery-powered devices sensor interfaces temperature measurement electronic scales figure 2. 8-lead soic_n (r-8) general description the ad8538 is a very high precision amplifier featuring extremely low offset voltage, low input bias current, and low power consumption. the supply current is less than 180 a at 5.0 v. operation is fully specified from 2.7 v to 5.0 v single supply (1.35 v to 2.5 v dual supply). the ad8538 operates using very low power making this amplifier ideal for battery-powered devices and portable equipment. the ad8538 is specified over the extended industrial temperature range (?40c to +125c). the ad8538 amplifier is available in 5-lead tsot-23, and 8-lead, narrow body soic packages.
ad8538 rev. 0 | page 2 of 12 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 pin configuration diagrams ........................................................... 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 ....................................................................... 12 ordering guide .......................................................................... 12 revision history 10/05revision 0: initial version
ad8538 rev. 0 | page 3 of 12 specifications electrical specifications @v s = 5.0 v, v cm = 2.5 v, v o = 2.5 v, t a = 25c, unless otherwise specified. table 1. parameter symbol conditions min typ max unit input characteristics offset voltage v os 5 13 v ?40c t a +125c 30 v input bias current i b 15 25 pa ?40c t a +85c 35 100 pa ?40c t a +125c 0.7 1.0 na input offset current i os 20 50 pa ?40c t a +125c 150 pa input voltage range 0 5 v common-mode rejection ratio cmrr v cm = 0 v to 5 v 115 150 db ?40c t a +125c; v cm = 0.2 v to 4.8 v 100 135 db large signal voltage gain a vo r l = 10 k, v o = 0.1 v to 4.9 v 115 141 db ?40c t a +125c 110 135 db offset voltage drift v os / t ?40c t a +125c 0.03 0.1 v/c output characteristics output voltage high v oh r l = 100 k to ground 4.99 4.998 v ?40c t a +125c 4.98 v r l = 10 k to ground 4.95 4.970 v ?40c t a +125c 4.94 v output voltage low v ol r l = 100 k to v+ 1.9 5 mv ?40c t a +125c 2.8 7 mv r l = 10 k to v+ 17 20 mv ?40c t a +125c 20 30 mv short-circuit limit i sc 25 ma power supply power supply rejection ratio psrr v s = 2.7 v to 5.0 v 105 125 db ?40c t a +125c 100 125 db supply current/amplifier i sy i o = 0 150 180 a ?40c t a +125c 190 215 a dynamic performance slew rate sr r l =10 k 0.4 v/s settling time 0.01% t s g = 1, 2 v step, c l = 20 pf, r l = 1 k 10 s overload recovery time 0.05 ms gain bandwidth product gbp 600 khz phase margin ? o r l = 10 k, r l = 100 k, c l = 20 pf 65 degrees noise performance voltage noise e n p-p f = 0.1 hz to 10 hz 2.0 v p-p voltage noise density e n f = 1 khz 50 nv/ hz
ad8538 rev. 0 | page 4 of 12 @ v s = 2.7 v, v cm = 1.35 v, v o = 1.35 v, t a = 25c, unless otherwise specified. table 2. parameter symbol conditions min typ max unit input characteristics offset voltage v os 5 13 v ?40c t a +125c 30 v input bias current i b 15 25 pa ?40c t a +85c 35 100 pa ?40c t a +125c 0.7 1.0 na input offset current i os 20 50 pa ?40c t a +125c 150 pa input voltage range 0 2.7 v common-mode rejection ratio cmrr v cm = 0 v to 2.5 v 110 140 db ?40c t a +125c 100 135 db large signal voltage gain a vo r l = 10 k, v o = 0.1 v to 1.7 v 110 140 db ?40c t a +125c 105 135 db offset voltage drift v os / t ?40c t a +125c 0.03 0.1 v/c output characteristics output voltage high v oh r l = 100 k to ground 2.68 2.698 v ?40c t a +125c 2.68 v r l = 10 k to ground 2.67 2.68 v ?40c t a +125c 2.66 v output voltage low v ol r l = 100 k to v+ 1.7 5 mv ?40c t a +125c 2.4 5 mv r l = 10 k to v+ 14 20 mv ?40c t a +125c 20 25 mv short-circuit limit i sc 8 ma power supply power supply rejection ratio psrr v s = 2.7 v to 5.5 v 105 125 db ?40c t a +125c 100 125 db supply current/amplifier i sy i o = 0 150 180 a ?40c t a +125c 190 215 a dynamic performance slew rate sr r l = 10 k 0.4 v/s settling time 0.01% t s g = 1, 1 v step, c l = 20 pf, r l = 1 k 5 s overload recovery time 0.05 ms gain bandwidth product gbp 600 khz phase margin ? o r l = 10 k, r l = 100 k, c l = 20 pf 65 degrees noise performance voltage noise e n p-p f = 0.1 hz to 10 hz 2.0 v p-p voltage noise density e n f = 1 khz 50 nv/ hz
ad8538 rev. 0 | page 5 of 12 absolute maximum ratings t = 25c, unless otherwise noted. a table 3. parameter rating 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. supply voltage +6 v input voltage v ? 0.3 v to v + 0.3 v ss dd differential input voltage 6 v output short-circuit duration to gnd observe derating curve storage temperature range C65c to +150c absolute maximum ratings apply at 25c, unless otherwise noted. lead temperature (soldering, 60 sec) 300c operating temperature range C40c to +125c thermal resistance junction temperature range ?65c to +150c ja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. table 4. thermal characteristics package type unit ja jc 5-lead tsot-23 (uj-5) 207 61 c/w 8-lead soic_n (r-8) 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 pr ecautions are recommended to avoid performance degradation or loss of functionality.
ad8538 rev. 0 | page 6 of 12 typical performance characteristics v = 5 v or 2.5 v, unless otherwise noted. sy 700 0 100 200 300 400 500 600 25 45 65 85 105 125 05624-006 temperature (c) input bias current (pa) v sy = 5v and 2.7v 450 0 ?10.0 05624-003 input offset voltage (v) number of amplifiers 50 100 150 200 250 300 350 400 v sy = 5v 0v < v cm < 5v t a = 25c ?8.4 ?6.8 ?5.2 ?3.6 ?2.0 ?0.4 1.2 2.8 4.4 6.0 7.6 9.2 figure 6. input bias current vs. temperature figure 3. input offset voltage distribution 14 0 00 . 0 9 05624-004 tcv os (v/c) number of amplifiers 6 160 0 05 05624-007 supply voltage (v) supply current (a) 2 4 6 8 10 12 0.012 0.024 0.036 0.048 0.060 0.072 0.084 v sy =5v ?40c < t a < +125c 20 40 60 80 100 120 140 1234 t a =25c figure 7. supply current vs. supply voltage figure 4. input offset voltage drift distribution 10 ?10 05 05624-005 input common-mode voltage (v) input offset voltage ( v) ?8 ?6 ?4 ?2 0 2 4 6 8 1234 v sy =5v t a =25c 200 0 50 100 150 ?40 10 60 110 05624-008 temperature (c) supply current ( a) v sy =5v v sy =2.7v figure 8. supply current vs. temperature figure 5. input offset voltage vs. input common-mode voltage
ad8538 rev. 0 | page 7 of 12 10000 0.01 0.1 1 10 100 1000 0.001 10 1 0.1 0.01 05624-009 load current (ma) output satu r ation voltage (mv) v sy ?v oh v sy =5v t a =25c source sink v ol 70 ?20 ?10 0 10 30 40 50 60 20 ?45 0 45 90 1k 10k 100k 1m 05624-012 frequency (hz) open-loop gain (db) open-loop phase shift (degrees) v sy = 2.5v and 1.35v r l =100k ? c l =20pf 135 m figure 9. output saturation voltage vs. load current figure 12. open-loop gain and phase vs. frequency 35 0 5 10 15 20 25 30 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 05624-010 temperature (c) output satu r ation voltage (mv) v sy ?v oh v sy =5v r l = 10k ? v ol 120 0 100 1m 05624-013 frequency (hz) cmrr (db) 20 40 60 80 100 1k 10k 100k v sy = 5v and 2.7v t a =25c figure 13. cmrr vs. frequency figure 10. output saturation voltage vs. temperature 60 ?20 1k 10k 100k 1m 05624-011 frequency (hz) closed-loop gain (db) 0 20 40 v sy = 5v and 2.7v c l = 20pf r l =2k ? a v =10 a v = 100 a v =1 100 0 100 1m 05624-014 frequency (hz) psrr (db) 20 40 60 80 1k 10k 100k v sy = 2.5v and 1.35v t a =25c +psrr ?psrr figure 14. psrr vs. frequency figure 11. closed-loop gain vs. frequency
ad8538 rev. 0 | page 8 of 12 time (4s/div) voltage (1v/div) 05624-017 v sy =5v a v =1 c l = 300pf r l = 10k ? 1000 0.01 1 0.1 10 100 100 1k 10k 100k 1m 05624-022 frequency (hz) output impedance ( ? ) v sy = 5v and 2.7v a v =1 a v =10 a v = 100 figure 18. large signal transient response figure 15. closed-loop outp ut impedance vs. frequency time (10s/div) 05624-018 v sy =5v a v =?50 v out (v) v in (mv) 100 0 0 ?2.5 60 0 1 1000 05624-015 load capacitance (pf) small signal overshoot (%) 10 20 30 40 50 10 100 v sy =5v t a =25c r l =2k ? os+ os? figure 16. small signal overshoot vs. load capacitance figure 19. positive overload recovery time (4s/div) voltage (50mv/div) 05624-016 v sy =5vand2.7v a v =1 c l = 300pf r l =2k ? time (10s/div) v out (v) v in (mv) 05624-019 v sy =5v a v =?50 0 ?100 2.5 0 figure 17. small signal transient response figure 20. negative overload recovery
ad8538 rev. 0 | page 9 of 12 time (200s/div) voltage (1v/div) 05624-023 v sy =5v a v =1 v in =6vp-p r l = 10k ? v out v in 1000 10 100 10 100 1k 10k 05624-021 frequency (hz) voltage noise density (nv/ hz) v sy = 5v t a = 25c figure 23. no phase reversal figure 21. voltage noise density time (1s/div) voltage (500nv/div) 05624-020 v sy =5vand2.7v figure 22. 0.1 hz to 10 hz input voltage noise
ad8538 rev. 0 | page 10 of 12 v = 2.7 v or 1.35 v. s 180 0 05624-024 input offset voltage (v) number of amplifiers 20 40 60 80 100 120 140 160 ?10.0 ?8.4 ?6.8 ?5.2 ?3.6 ?2.0 ?0.4 1.2 2.8 4.4 6.0 7.6 9.2 v sy =2.7v 0v < v cm <2.7v t a =25c 10000 0.1 0.001 1 05624-027 load current (ma) output saturation voltage (mv) 1 10 100 1000 0.01 0.1 sink source v sy =2.7v t a =25c figure 24. input offset voltage distribution figure 27. output saturation voltage vs. load current 30 0 ?40 125 05624-028 temperature (c) output saturation voltage (mv) 5 10 15 20 25 ?25?105 203550658095110 v sy =2.7v r l =10k ? v sy =voh vol 35 0 05624-025 tcv os (v/c) number of amplifiers 5 10 15 20 25 30 0 0.012 0.024 0.036 0.048 0.060 0.072 0.084 0.096 v sy =2.7v ?40c < t a < +125c figure 25. input offset voltage drift distribution figure 28. output saturation voltage vs. temperature 10 ?10 02 05624-026 input common-mode voltage (v) input offset voltage . 5 ( v) ?8 ?6 ?4 ?2 0 2 4 6 8 0.5 1.0 1.5 2.0 v sy =2.7v t a =25c 80 0 11 05624-029 load capacitance (pf) small signal overshoot (%) 0 0 0 10 20 30 40 50 60 70 10 100 os+ os? v sy =2.7v t a =25c r l =2k ? figure 29. small signal overshoot vs. load capacitance figure 26. input offset voltage vs. input common-mode voltage
ad8538 rev. 0 | page 11 of 12 time (4s/div) voltage (500mv/div) 05624-030 v sy =2.7v a v =1 c l = 100pf r l = 10k ? 1000 10 100 10 100 1k 10k 100k 05624-032 frequency (hz) voltage noise density (nv/ hz) v sy = 2.7v t a = 25c figure 30. large signal transient response figure 31. voltage noise density
ad8538 rev. 0 | page 12 of 12 outline dimensions * compliant to jedec standards mo-193-ab with the exception of package height and thickness. pin 1 1.60 bsc 2.80 bsc 1.90 bsc 0.95 bsc 0.20 0.08 0.60 0.45 0.30 8 4 0 0.50 0.30 0.10 max seating plane * 1.00 max * 0.90 0.87 0.84 2.90 bsc 54 12 3 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 32. 5-lead thin small outline transistor package [tsot_23] (uj-5) dimensions shown in millimeters figure 33. 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 AD8538AUJZ-R2 ?40c to +125c 5-lead tsot-23 uj-5 aoc 1 ad8538aujz-reel ?40c to +125c 5-lead tsot-23 uj-5 aoc 1 ad8538aujz-reel7 ?40c to +125c 5-lead tsot-23 uj-5 aoc 1 ad8538arz ?40c to +125c 8-lead soic_n r-8 1 ad8538arz-reel ?40c to +125c 8-lead soic_n r-8 1 ad8538arz-reel7 ?40c to +125c 8-lead soic_n r-8 1 t 1 z = pb-free part. ? 2005 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d05624-0-10/05(0) ttt

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