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precision cmos, single-supply, rail-to-rail, input/output wideband operational amplifiers ad8601/ad8602/ad8604 rev. g 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 ?2000C2011 analog devices, inc. all rights reserved. rev. g 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 ?2000C2011 analog devices, inc. all rights reserved. features low offset voltage: 500 v maximum single-supply operation: 2.7 v to 5.5 v low supply current: 750 a/amplifier wide bandwidth: 8 mhz slew rate: 5 v/s low distortion no phase reversal low input currents unity-gain stable qualified for automotive applications applications current sensing barcode scanners pa controls battery-powered instrumentation multipole filters sensors asic input or output amplifiers audio general description the ad8601, ad8602, and ad8604 are single, dual, and quad rail-to-rail, input and output, single-supply amplifiers featuring very low offset voltage and wide signal bandwidth. these amplifiers use a new, patented trimming technique that achieves superior performance without laser trimming. all are fully specified to operate on a 3 v to 5 v single supply. the combination of low offsets, very low input bias currents, and high speed make these amplifiers useful in a wide variety of applications. filters, integrators, diode amplifiers, shunt current sensors, and high impedance sensors all benefit from the combination of performance features. audio and other ac applications benefit from the wide bandwidth and low distortion. for the most cost-sensitive applications, the d grades offer this ac performance with lower dc precision at a lower price point. applications for these amplifiers include audio amplification for portable devices, portable phone headsets, bar code scanners, portable instruments, cellular pa controls, and multipole filters. the ability to swing rail-to-rail at both the input and output enables designers to buffer cmos adcs, dacs, asics, and other wide output swing devices in single-supply systems. pin configurations 01525-001 out a 1 v? 2 +in 3 v+ 5 ?in 4 ad8601 top view (not to scale) figure 1. 5-lead sot-23 (rj suffix) out a 1 ?in a 2 +in a 3 v? 4 v+ 8 out b 7 ?in b 6 +in b 5 ad8602 top view (not to scale) 01525-002 figure 2. 8-lead msop (rm suffix) and 8-lead soic (r-suffix) 01525-003 1 2 3 4 5 6 7 ad8604 ?in a +in a v+ out b ?in b +in b out a 14 13 12 11 10 9 8 ?in d +in d v? out c ?in c +in c out d top view (not to scale) figure 3. 14-lead tssop (ru suffix) and 14-lead soic (r suffix) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ?in a +in a v+ out b ?in b +in b out a ?in d +in d v? out c nc nc nc = no connect ?in c +in c out d top view (not to scale) ad8604 01525-004 figure 4. 16-lead shrink smal l outline qsop (rq suffix) the ad8601, ad8602, and ad8604 are specified over the extended industrial (?40c to +125c) temperature range. the ad8601, single, is available in a tiny, 5-lead sot-23 package. the ad8602, dual, is available in 8-lead msop and 8-lead, narrow soic surface-mount packages. the ad8604, quad, is available in 14-lead tssop, 14-lead soic, and 16-lead qsop packages. see the ordering guide for automotive grades.
ad8601/ad8602/ad8604 rev. g | page 2 of 24 table of contents features .............................................................................................. 1 ? applications....................................................................................... 1 ? general description ......................................................................... 1 ? pin configurations ........................................................................... 1 ? revision history ............................................................................... 2 ? specifications..................................................................................... 3 ? electrical characteristics............................................................. 3 ? absolute maximum ratings............................................................ 5 ? thermal resistance ...................................................................... 5 ? esd caution.................................................................................. 5 ? typical performance characteristics ............................................. 6 ? theory of operation ...................................................................... 15 ? rail-to-rail input stage ............................................................. 15 ? input overvoltage protection ................................................... 16 ? overdrive recovery ................................................................... 16 ? power-on time .......................................................................... 16 ? using the ad8602 in high source impedance applications ................................................................................ 16 ? high side and low side, precision current monitoring ...... 16 ? using the ad8601 in single-supply, mixed signal applications ................................................................................ 17 ? pc100 compliance for computer audio applications ........ 17 ? spice model............................................................................... 18 ? outline dimensions ....................................................................... 19 ? ordering guide .......................................................................... 22 ? automotive products ................................................................. 22 ? revision history 1/11rev. f to rev. g changes to ordering guide .......................................................... 22 change to automotive products section .................................... 22 5/10rev. e to rev. f changes to features section and general description section................................................................................................ 1 changes to ordering guide .......................................................... 22 added automotive products section .......................................... 22 2/10rev. d to rev. e add 16-lead qsop............................................................universal changes to table 3 and table 4....................................................... 5 updated outline dimensions ....................................................... 19 changes to ordering guide .......................................................... 22 11/03rev. c to rev. d changes to features ..........................................................................1 changes to ordering guide .............................................................4 3/03rev. b to rev. c changes to features ..........................................................................1 3/03rev. a to rev. b change to features ............................................................................1 change to functional block diagrams...........................................1 change to tpc 39 .......................................................................... 11 changes to figures 4 and 5 ........................................................... 14 changes to equations 2 and 3................................................. 14, 15 updated outline dimensions....................................................... 16
ad8601/ad8602/ad8604 rev. g | page 3 of 24 specifications electrical characteristics v s = 3 v, v cm = v s /2, t a = 25c, unless otherwise noted. table 1. a grade d grade parameter symbol conditions min typ max min typ max unit input characteristics offset voltage (ad8601/ad8602) v os 0 v v cm 1.3 v 80 500 1100 6000 v ?40c t a +85c 700 7000 v ?40c t a +125c 1100 7000 v 0 v v cm 3 v 1 350 750 1300 6000 v ?40c t a +85c 1800 7000 v ?40c t a +125c 2100 7000 v offset voltage (ad8604) v os v cm = 0 v to 1.3 v 80 600 1100 6000 v ?40c t a +85c 800 7000 v ?40c t a +125c 1600 7000 v v cm = 0 v to 3.0 v 1 350 800 1300 6000 v ?40c t a +85c 2200 7000 v ?40c t a +125c 2400 7000 v input bias current i b 0.2 60 0.2 200 pa ?40c t a +85c 25 100 25 200 pa ?40c t a +125c 150 1000 150 1000 pa input offset current i os 0.1 30 0.1 100 pa ?40c t a +85c 50 100 pa ?40c t a +125c 500 500 pa input voltage range 0 3 0 3 v common-mode rejection ratio cmrr v cm = 0 v to 3 v 68 83 52 65 db large signal voltage gain a vo v o = 0.5 v to 2.5 v, r l = 2 k, v cm = 0 v 30 100 20 60 v/mv offset voltage drift v os /t 2 2 v/c output characteristics output voltage high v oh i l = 1.0 ma 2.92 2.95 2.92 2.95 v C40c t a +125c 2.88 2.88 v output voltage low v ol i l = 1.0 ma 20 35 20 35 mv ?40c t a +125c 50 50 mv output current i out 30 30 ma closed-loop output impedance z out f = 1 mhz, a v = 1 12 12 power supply power supply rejection ratio psrr v s = 2.7 v to 5.5 v 67 80 56 72 db supply current/amplifier i sy v o = 0 v 680 1000 680 1000 a ?40c t a +125c 1300 1300 a dynamic performance slew rate sr r l = 2 k 5.2 5.2 v/s settling time t s to 0.01% <0.5 <0.5 s gain bandwidth product gbp 8.2 8.2 mhz phase margin o 50 50 degrees noise performance voltage noise density e n f = 1 khz 33 33 nv/hz f = 10 khz 18 18 nv/hz current noise density i n 0.05 0.05 pa/hz 1 for v cm between 1.3 v and 1.8 v, v os may exceed specified value.
ad8601/ad8602/ad8604 rev. g | page 4 of 24 v s = 5.0 v, v cm = v s /2, t a = 25c, unless otherwise noted. table 2. a grade d grade parameter symbol conditions min typ max min typ max unit input characteristics offset voltage (ad8601/ad8602) v os 0 v v cm 5 v 80 500 1300 6000 v ?40c t a +125c 1300 7000 v offset voltage (ad8604) v os v cm = 0 v to 5 v 80 600 1300 6000 v ?40c t a +125c 1700 7000 v input bias current i b 0.2 60 0.2 200 pa ?40c t a +85c 100 200 pa ?40c t a +125c 1000 1000 pa input offset current i os 0.1 30 0.1 100 pa ?40c t a +85c 6 50 6 100 pa ?40c t a +125c 25 500 25 500 pa input voltage range 0 5 0 5 v common-mode rejection ratio cmrr v cm = 0 v to 5 v 74 89 56 67 db large signal voltage gain a vo v o = 0.5 v to 4.5 v, r l = 2 k, v cm = 0 v 30 80 20 60 v/mv offset voltage drift v os /t 2 2 v/c output characteristics output voltage high v oh i l = 1.0 ma 4.925 4.975 4.925 4.975 v i l = 10 ma 4.7 4.77 4.7 4.77 v ?40c t a +125c 4.6 4.6 v output voltage low v ol i l = 1.0 ma 15 30 15 30 mv i l = 10 ma 125 175 125 175 mv ?40c t a +125c 250 250 mv output current i out 50 50 ma closed-loop output impedance z out f = 1 mhz, a v = 1 10 10 power supply power supply rejection ratio psrr v s = 2.7 v to 5.5 v 67 80 56 72 db supply current/amplifier i sy v o = 0 v 750 1200 750 1200 a ?40c t a +125c 1500 1500 a dynamic performance slew rate sr r l = 2 k 6 6 v/s settling time t s to 0.01% <1.0 <1.0 s full power bandwidth bwp <1% distortion 360 360 khz gain bandwidth product gbp 8.4 8.4 mhz phase margin o 55 55 degrees noise performance voltage noise density e n f = 1 khz 33 33 nv/hz f = 10 khz 18 18 nv/hz current noise density i n f = 1 khz 0.05 0.05 pa/hz
ad8601/ad8602/ad8604 rev. g | page 5 of 24 absolute maximum ratings thermal resistance table 3. parameter rating supply voltage 6 v input voltage gnd to v s differential input voltage 6 v storage temperature range ?65c to +150c operating temperature range ?40c to +125c junction temperature range ?65c to +150c lead temperature range (soldering, 60 sec) 300c esd 2 kv hbm ja is specified for worst-case conditions, that is, a device soldered onto a circuit board for surface-mount packages using a standard 4-layer board. table 4. thermal resistance package type ja jc unit 5-lead sot-23 (rj) 190 92 c/w 8-lead soic (r) 120 45 c/w 8-lead msop (rm) 142 45 c/w 14-lead soic (r) 115 36 c/w 14-lead tssop (ru) 112 35 c/w 16-lead qsop (rq) 115 36 c/w 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. esd caution
ad8601/ad8602/ad8604 rev. g | page 6 of 24 typical performance characteristics 3,000 2,500 2,000 1,500 1,000 500 0 v s = 3v t a = 25c v cm = 0v to 3v ?1.0 ?0.8 ?0.6 ?0.4 ?0.2 0 0.2 0.4 0.6 0.8 1.0 input offset voltage (mv) quantity (amplifiers) 01525-005 figure 5. input offset voltage distribution 3,000 2,500 2,000 1,500 1,000 500 0 v s = 5v t a = 25c v cm = 0v to 5v ?1.0 ?0.8 ?0.6 ?0.4 ?0.2 0 0.2 0.4 0.6 0.8 1.0 input offset voltage (mv) quantity (amplifiers) 01525-006 figure 6. input offset voltage distribution 60 50 40 30 20 10 0 v s = 3v t a = 25c to 85c 01234 5678910 tcvos (v/c) quantity (amplifiers) 01525-007 figure 7. input offset voltage drift distribution 60 50 40 30 20 10 0 v s = 5v t a = 25c to 85c 01234 5678910 tcvos (v/c) quantity (amplifiers) 01525-008 figure 8. input offset voltage drift distribution 1.5 1.0 0.5 0 ?0.5 ?1.0 ?1.5 ?2.0 0 0.5 1.0 1.5 2.0 2.5 3.0 common-mode voltage (v) input offset voltage (mv) 01525-009 v s = 3v t a = 25c figure 9. input offset voltage vs. common-mode voltage 1.5 1.0 0.5 0 ?0.5 ?1.0 ?1.5 ?2.0 01 234 common-mode voltage (v) input offset voltage (mv) 01525-010 5 v s = 5v t a = 25c figure 10. input offset voltage vs. common-mode voltage
ad8601/ad8602/ad8604 rev. g | page 7 of 24 300 250 200 150 100 50 0 ?40 ? 25 ? 105 203550658095110125 temperature (c) input bias current (pa) 01525-011 v s = 3v figure 11. input bias current vs. temperature 300 250 200 150 100 50 0 ?40 ? 25 ? 105 203550658095110125 temperature (c) input bias current (pa) 01525-012 v s = 5v figure 12. input bias current vs. temperature 5 4 3 2 1 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 common-mode voltage (v) input bias current (pa) 01525-013 v s = 5v t a = 25c figure 13. input bias current vs. common-mode voltage 30 25 20 15 10 5 0 ?40 ? 25 ? 105 203550658095110125 temperature (c) input offset current (pa) 01525-014 v s = 3v figure 14. input offset current vs. temperature 30 25 20 15 10 5 0 ?40 ? 25 ? 105 203550658095110125 temperature (c) input offset current (pa) 01525-015 v s = 5v figure 15. input offset current vs. temperature 10k 1k 100 10 1 0.1 0.001 0.01 0.1 1 10 100 load current (ma) output voltage (mv) 01525-016 v s = 2.7v t a = 25c source sink figure 16. output voltage to supply rail vs. load current
ad8601/ad8602/ad8604 rev. g | page 8 of 24 10k 1k 100 10 1 0.1 0.001 0.01 0.1 1 10 100 load current (ma) output voltage (mv) 01525-017 v s = 5v t a = 25c source sink figure 17. output voltage to supply rail vs. load current 5.1 5.0 4.9 4.8 4.7 4.6 4.5 ?40 ? 25 ? 105 203550658095110125 temperature (c) output voltage (v) 01525-018 v s = 5v v oh @ 1ma load v oh @ 10ma load figure 18. output voltag e swing vs. temperature 250 200 150 100 50 0 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 temperature (c) output voltage (mv) 01525-019 v s = 5v v oh @ 1ma load v oh @ 10ma load figure 19. output voltag e swing vs. temperature 35 30 25 20 15 10 5 0 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 temperature (c) output voltage (mv) 01525-020 v s = 2.7v v oh @ 1ma load figure 20. output voltag e swing vs. temperature 2.67 2.66 2.65 2.64 2.63 2.62 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 temperature (c) output voltage (v) 01525-021 v s = 2.7v v oh @ 1ma load figure 21. output voltag e swing vs. temperature 120 45 0 ?45 ?90 90 135 180 225 270 315 360 100 80 60 40 20 0 ?20 ?40 ?60 ?80 1k 10k 100k 1m 10m 100m frequency (hz) gain (db) phase shift (degrees) 01525-022 v s = 3v r l = no load t a = 25c phase gain figure 22. open-loop gain and phase vs. frequency
ad8601/ad8602/ad8604 rev. g | page 9 of 24 120 45 0 ?45 ?90 90 135 180 225 270 315 360 100 80 60 40 20 0 ?20 ?40 ?60 ?80 1k 10k 100k 1m 10m 100m frequency (hz) gain (db) phase shift (degrees) 01525-023 v s = 5v r l = no load t a = 25c phase gain figure 23. open-loop gain and phase vs. frequency 40 20 0 1k 10k 100k 1m 10m 100m frequency (hz) closd-loop gain (db) 01525-024 v s = 3v t a = 25c a v = 100 a v = 10 a v = 1 figure 24. closed-loop gain vs. frequency 40 20 0 1k 10k 100k 1m 10m 100m frequency (hz) closd-loop gain (db) 01525-025 v s = 5v t a = 25c a v = 100 a v = 10 a v = 1 figure 25. closed-loop gain vs. frequency 3.0 2.5 2.0 1.5 1.0 0.5 0 1k 10k 100k 1m 10m frequency (hz) output swing (v p-p) 01525-026 v s = 2.7v v in = 2.6v p-p r l = 2k ? t a = 25c a v = 1 figure 26. closed-loop output voltage swing vs. frequency 6 5 4 3 2 1 0 1k 10k 100k 1m 10m frequency (hz) output swing (v p-p) 01525-027 v s = 5v v in = 4.9v p-p r l = 2k ? t a = 25c a v = 1 figure 27. closed-loop output voltage swing vs. frequency 160 140 200 180 120 100 80 60 40 20 0 1k 10k 100k 1m 10m 100m frequency (hz) output impedance ( ? ) 01525-028 v s = 3v t a = 25c a v = 100 a v = 10 a v = 1 figure 28. output im pedance vs. frequency
ad8601/ad8602/ad8604 rev. g | page 10 of 24 160 140 200 180 120 100 80 60 40 20 0 100 1k 10k 100k 1m 10m frequency (hz) output impedance ( ? ) 01525-029 v s = 5v t a = 25c a v = 100 a v = 10 a v = 1 figure 29. output im pedance vs. frequency 160 140 120 100 80 60 40 20 0 ?20 ?40 1k 10k 100k 1m 10m 20m frequency (hz) common-mode rejection (db) 01525-030 v s = 3v t a = 25c figure 30. common-mode reje ction ratio vs. frequency 160 140 120 100 80 60 40 20 0 ?20 ?40 1k 10k 100k 1m 10m 20m frequency (hz) common-mode rejection (db) 01525-031 v s = 5v t a = 25c figure 31. common-mode reje ction ratio vs. frequency 160 140 120 100 80 60 40 20 0 ?20 ?40 1k 100 10k 100k 1m 10m frequency (hz) power supply rejection (db) 01525-032 v s = 5v t a = 25c figure 32. power supply reje ction ratio vs. frequency 70 ?os +os 60 50 40 30 20 10 0 10 100 1k capacitance (pf) small signal overshoot (%) 01525-033 v s = 2.7v r l = t a = 25c a v = 1 figure 33. small signal overshoot vs. load capacitance 70 ?os +os 60 50 40 30 20 10 0 10 100 1k capacitance (pf) small signal overshoot (%) 01525-034 v s = 5v r l = t a = 25c a v = 1 figure 34. small signal overshoot vs. load capacitance
ad8601/ad8602/ad8604 rev. g | page 11 of 24 1.2 1.0 0.8 0.6 0.4 0.2 0 ?40 ? 25 ? 105 203550658095110125 temperature (c) supply current per amplifier (ma) 01525-035 v s = 5v figure 35. supply current per amplifier vs. temperature 1.0 0.8 0.6 0.4 0.2 0 ?40 ? 25 ? 105 203550658095110125 temperature (c) supply current per amplifier (ma) 01525-036 v s = 3v figure 36. supply current per amplifier vs. temperature 0.8 0.6 0.7 0.5 0.4 0.3 0.2 0.1 0 012345 supply voltage (v) supply current per amplifier (ma) 01525-037 6 figure 37. supply current per amplifier vs. supply voltage 0.1 0.01 0.001 0.0001 20 100 1k 10k 20k frequency (hz) thd + n (%) 01525-038 v s = 5v t a = 25c g = 10 r l = 600 ? r l = 600 ? r l = 2k ? r l = 2k ? r l = 10k ? r l = 10k ? g = 1 figure 38. total harmonic distortion + noise vs. frequency 64 56 48 40 32 24 16 8 0 0 5 10 15 20 25 frequency (khz) voltage noise density (nv/ hz) 01525-039 v s = 2.7v t a = 25c figure 39. voltage noise density vs. frequency 208 182 156 130 104 78 52 26 0 0 0.5 1.0 1.5 2.0 2.5 frequency (khz) voltage noise density (nv/ hz) 01525-040 v s = 2.7v t a = 25c figure 40. voltage noise density vs. frequency
ad8601/ad8602/ad8604 rev. g | page 12 of 24 208 182 156 130 104 78 52 26 0 0 0.5 1.0 1.5 2.0 2.5 frequency (khz) voltage noise density (nv/ hz) 01525-041 v s = 5v t a = 25c figure 41. voltage noise density vs. frequency 64 56 48 40 32 24 16 8 0 0 5 10 15 20 25 frequency (khz) voltage noise density (nv/ hz) 01525-042 v s = 5v t a = 25c figure 42. voltage noise density vs. frequency time (1s/div) voltage (2.5v/div) 01525-043 v s = 2.7v t a = 25c figure 43. 0.1 hz to 10 hz input voltage noise time (1s/div) voltage (2.5v/div) 01525-044 v s = 5v t a = 25c figure 44. 0.1 hz to 10 hz input voltage noise 01525-045 v s = 5v r l = 10k ? c l = 200pf t a = 25c 50mv/div 200ns/div figure 45. small signal transient response 01525-046 v s = 2.7v r l = 10k ? c l = 200pf t a = 25c 50mv/div 200ns/div figure 46. small signal transient response
ad8601/ad8602/ad8604 rev. g | page 13 of 24 time (400ns/div) voltage (1v/div) 01525-047 v s = 5v r l = 10k ? c l = 200pf a v = 1 t a = 25c figure 47. large signal transient response time (400ns/div) voltage (500mv/div) 01525-048 v s = 2.7v r l = 10k ? c l = 200pf a v = 1 t a = 25c figure 48. large signal transient response time (2s/div) voltage (1v/div) 01525-049 v s = 2.7v r l = 10k ? a v = 1 t a = 25c v in v out figure 49. no phase reversal time (2s/div) voltage (1v/div) 01525-050 v s = 5v r l = 10k ? a v = 1 t a = 25c v in v out figure 50. no phase reversal time (100ns/div) +0.1% error ?0.1% error voltage (v) 01525-051 v s = 5v r l = 10k ? v o = 2v p-p t a = 25c v in trace ? 0.5v/div v out trace ? 10mv/div v in v out figure 51. settling time 2.0 1.5 1.0 0.5 0 ?0.5 ?1.0 ?1.5 ?2.0 300 350 400 450 500 550 600 settling time (ns) output swing (v) 01525-052 v s = 2.7v t a = 25c 0.1% 0.01% 0.1% 0.01% figure 52. output swing vs. settling time
ad8601/ad8602/ad8604 rev. g | page 14 of 24 5 4 3 2 1 0 ?1 ?2 ?3 ?4 ?5 0 200 400 600 800 1,000 settling time (ns) output swing (v) 01525-053 v s = 5v t a = 25c 0.1% 0.01% 0.1% 0.01% figure 53. output swing vs. settling time
ad8601/ad8602/ad8604 rev. g | page 15 of 24 theory of operation the ad8601/ad8602/ad8604 family of amplifiers are rail-to-rail input and output, precision cmos amplifiers that operate from 2.7 v to 5.0 v of the power supply voltage. these amplifiers use analog devices, inc., digitrim? technology to achieve a higher degree of precision than available from most cmos amplifiers. digitrim technology is a method of trimming the offset voltage of the amplifier after it has been assembled. the advantage in post- package trimming lies in the fact that it corrects any offset voltages due to the mechanical stresses of assembly. this technology is scalable and used with every package option, including the 5-lead sot-23, providing lower offset voltages than previously achieved in these small packages. the digitrim process is completed at the factory and does not add additional pins to the amplifier. all ad860x amplifiers are available in standard op amp pinouts, making digitrim completely transparent to the user. the ad860x can be used in any precision op amp application. the input stage of the amplifier is a true rail-to-rail architecture, allowing the input common-mode voltage range of the op amp to extend to both positive and negative supply rails. the voltage swing of the output stage is also rail-to-rail and is achieved by using an nmos and pmos transistor pair connected in a common-source configuration. the maximum output voltage swing is proportional to the output current, and larger currents limit how close the output voltage can get to the supply rail, which is a characteristic of all rail-to-rail output amplifiers. with 1 ma of output current, the output voltage can reach within 20 mv of the positive rail and within 15 mv of the negative rail. at light loads of >100 k, the output swings within ~1 mv of the supplies. the open-loop gain of the ad860x is 80 db, typical, with a load of 2 k. because of the rail-to-rail output configuration, the gain of the output stage and the open-loop gain of the amplifier are dependent on the load resistance. open-loop gain decreases with smaller load resistances. again, this is a characteristic inherent to all rail-to-rail output amplifiers. rail-to-rail input stage the input common-mode voltage range of the ad860x extends to both the positive and negative supply voltages. this maximizes the usable voltage range of the amplifier, an important feature for single-supply and low voltage applications. this rail-to-rail input range is achieved by using two input differential pairs, one nmos and one pmos, placed in parallel. the nmos pair is active at the upper end of the common-mode voltage range, and the pmos pair is active at the lower end. the nmos and pmos input stages are separately trimmed using digitrim to minimize the offset voltage in both differential pairs. both nmos and pmos input differential pairs are active in a 500 mv transition region, when the input common-mode voltage is between approximately 1.5 v and 1 v below the positive supply voltage. the input offset voltage shifts slightly in this transition region, as shown in figure 9 and figure 10 .the common-mode rejection ratio is also slightly lower when the input common- mode voltage is within this transition band. compared to the burr-brown opa2340ur rail-to-rail input amplifier, shown in figure 54 , the ad860x, shown in figure 55 , exhibits lower offset voltage shift across the entire input common-mode range, including the transition region. 0.7 0.4 0.1 ?0.2 ?0.5 ?0.8 ?1.1 ?1.4 012345 v cm (v) v os (mv) 01525-054 figure 54. burr-brown opa2340ur input offset voltage vs. common-mode voltage, 24 soic units @ 25c 0.7 0.4 0.1 ?0.2 ?0.5 ?0.8 ?1.1 ?1.4 012345 v cm (v) v os (mv) 01525-055 figure 55. ad8602ar input offset voltage vs. common-mode voltage, 300 soic units @ 25c
ad8601/ad8602/ad8604 rev. g | page 16 of 24 input overvoltage protection as with any semiconductor device, if a condition could exist that could cause the input voltage to exceed the power supply, the devices input overvoltage characteristic must be considered. excess input voltage energizes the internal pn junctions in the ad860x, allowing current to flow from the input to the supplies. this input current does not damage the amplifier, provided it is limited to 5 ma or less. this can be ensured by placing a resistor in series with the input. for example, if the input voltage could exceed the supply by 5 v, the series resistor should be at least (5 v/5 ma) = 1 k. with the input voltage within the supply rails, a minimal amount of current is drawn into the inputs, which, in turn, causes a negligible voltage drop across the series resistor. therefore, adding the series resistor does not adversely affect circuit performance. overdrive recovery overdrive recovery is defined as the time it takes the output of an amplifier to come off the supply rail when recovering from an overload signal. this is tested by placing the amplifier in a closed-loop gain of 10 with an input square wave of 2 v p-p while the amplifier is powered from either 5 v or 3 v. the ad860x has excellent recovery time from overload conditions. the output recovers from the positive supply rail within 200 ns at all supply voltages. recovery from the negative rail is within 500 ns at a 5 v supply, decreasing to within 350 ns when the device is powered from 2.7 v. power-on time the power-on time is important in portable applications where the supply voltage to the amplifier may be toggled to shut down the device to improve battery life. fast power-up behavior ensures that the output of the amplifier quickly settles to its final voltage, improving the power-up speed of the entire system. when the supply voltage reaches a minimum of 2.5 v, the ad860x settles to a valid output within 1 s. this turn-on response time is faster than many other precision amplifiers, which can take tens or hundreds of microseconds for their outputs to settle. using the ad8602 in high source impedance applications the cmos rail-to-rail input structure of the ad860x allows these amplifiers to have very low input bias currents, typically 0.2 pa. this allows the ad860x to be used in any application that has a high source impedance or must use large value resistances around the amplifier. for example, the photodiode amplifier circuit shown in figure 56 requires a low input bias current op amp to reduce output voltage error. the ad8601 minimizes offset errors due to its low input bias current and low offset voltage. the current through the photodiode is proportional to the incident light power on its surface. the 4.7 m resistor converts this current into a voltage, with the output of the ad8601 increasing at 4.7 v/a. the feedback capacitor reduces excess noise at higher frequencies by limiting the bandwidth of the circuit to () f c bw m7.42 1 = (1) using a 10 pf feedback capacitor limits the bandwidth to approximately 3.3 khz. ad8601 10p f (optional) v out 4.7v/a 4.7m ? d1 01525-056 figure 56. amplifier photodiode circuit high side and low side, precision current monitoring because of its low input bias current and low offset voltage, the ad860x can be used for precision current monitoring. the true rail-to-rail input feature of the ad860x allows the amplifier to monitor current on either the high side or the low side. using both amplifiers in an ad8602 provides a simple method for monitoring both current supply and return paths for load or fault detection. figure 57 and figure 58 demonstrate both circuits. 01525-057 1/2 ad8602 return to ground r sense 0.1 ? r1 100 ? r2 249k ? q1 2n3904 monitor output 3 v 3v figure 57. low-side current monitor 01525-058 3v i l v+ 3v monitor output r1 100 ? r2 2.49k ? r sense 0.1 ? q1 2n3905 1/2 ad8602 figure 58. high-side current monitor
ad8601/ad8602/ad8604 rev. g | page 17 of 24 voltage drop is created across the 0.1 resistor that is proportional to the load current. this voltage appears at the inverting input of the amplifier due to the feedback correction around the op amp. this creates a current through r1, which in turn, pulls current through r2. for the low side monitor, the monitor output voltage is given by ? ? ? ? ? ? ? ? ? ? ? ? ?= l sense i r1 r r2v output monitor 3 (2) for the high side monitor, the monitor output voltage is l sense i r1 r r2 output monitor ? ? ? ? ? ? = (3) using the components shown, the monitor output transfer function is 2.5 v/a. using the ad8601 in single-supply, mixed signal applications single-supply, mixed signal applications requiring 10 or more bits of resolution demand both a minimum of distortion and a maximum range of voltage swing to optimize performance. to ensure that the adcs or dacs achieve their best performance, an amplifier often must be used for buffering or signal conditioning. the 750 v maximum offset voltage of the ad8601 allows the amplifier to be used in 12-bit applications powered from a 3 v single supply, and its rail-to-rail input and output ensure no signal clipping. figure 59 shows the ad8601 used as an input buffer amplifier to the ad7476 , a 12-bit, 1 msps adc. as with most adcs, total harmonic distortion (thd) increases with higher source impedances. by using the ad8601 in a buffer configuration, the low output impedance of the amplifier minimizes thd while the high input impedance and low bias current of the op amp minimizes errors due to source impedance. the 8 mhz gain bandwidth product of the ad8601 ensures no signal attenua- tion up to 500 khz, which is the maximum nyquist frequency for the ad7476. v dd gnd sclk sdata v in cs ad7476/ad7477 r s ad8601 4 3 2 5 1 1f tant serial interface 5v supply 0.1f 0.1f 10f 680nf ref193 c/p 01525-059 figure 59. a complete 3 v 12-bit 1 mhz analog-to-digital conversion system figure 60 demonstrates how the ad8601 can be used as an output buffer for the dac for driving heavy resistive loads. the ad5320 is a 12-bit dac that can be used with clock frequencies up to 30 mhz and signal frequencies up to 930 khz. the rail- to-rail output of the ad8601 allows it to swing within 100 mv of the positive supply rail while sourcing 1 ma of current. the total current drawn from the circuit is less than 1 ma, or 3 mw from a 3 v single supply. ad8601 4 3 2 5 1 1 01525-060 v out 0v to 3v 3-wire serial interface r l ad5320 4 5 6 3 v 1f figure 60. using the ad8601 as a dac output buffer to drive heavy loads the ad8601, ad7476 , and ad5320 are all available in space- saving sot-23 packages. pc100 compliance for computer audio applications because of its low distortion and rail-to-rail input and output, the ad860x is an excellent choice for low cost, single-supply audio applications, ranging from microphone amplification to line output buffering. figure 38 shows the total harmonic distortion plus noise (thd + n) figures for the ad860x. in unity gain, the amplifier has a typical thd + n of 0.004%, or ?86 db, even with a load resistance of 600 . this is compliant with the pc100 specification requirements for audio in both portable and desktop computers. figure 61 shows how an ad8602 can be interfaced with an ac97 codec to drive the line output. here, the ad8602 is used as a unity-gain buffer from the left and right outputs of the ac97 codec. the 100 f output coupling capacitors block dc current and the 20 series resistors protect the amplifier from short circuits at the jack. notes 1. additional pins omitted for clarity. 01525-061 2 3 4 8 1 v dd v ss v dd left out right out 5v 5 v ad1881 (ac?97) a r4 20? c1 100f r2 2k? + 5 6 7 r5 20? c2 100f r3 2k? + b 35 29 26 36 25 ad8602 ad8602 figure 61. a pc100-compliant line output amplifier
ad8601/ad8602/ad8604 rev. g | page 18 of 24 spice model the spice macro-model for the ad860x amplifier can be down- loaded at www.analog.com . the model accurately simulates a number of both dc and ac parameters, including open-loop gain, bandwidth, phase margin, input voltage range, output voltage swing vs. output current, slew rate, input voltage noise, cmrr, psrr, and supply current vs. supply voltage. the model is optimized for performance at 27c. although it functions at different temperatures, it may lose accuracy with respect to the actual behavior of the ad860x.
ad8601/ad8602/ad8604 rev. g | page 19 of 24 outline dimensions compliant to jedec standards mo-178-aa 10 5 0 seating plane 1.90 bsc 0.95 bsc 0.60 bsc 5 123 4 3.00 2.90 2.80 3.00 2.80 2.60 1.70 1.60 1.50 1.30 1.15 0.90 0 .15 max 0 .05 min 1.45 max 0.95 min 0.20 max 0.08 min 0.50 max 0.35 min 0.55 0.45 0.35 11-01-2010-a figure 62. 5-lead small outline transistor package [sot-23] (rj-5) dimensions shown in millimeters compliant to jedec standards mo-187-aa 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 10-07-2009-b figure 63. 8-lead mini small outline package [msop] (rm-8) dimensions shown in millimeters
ad8601/ad8602/ad8604 rev. g | page 20 of 24 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 64. 8-lead standard small outline package [soic_n] (r-8) dimensions shown in millimeters and (inches) 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-ab 060606-a 14 8 7 1 6.20 (0.2441) 5.80 (0.2283) 4.00 (0.1575) 3.80 (0.1496) 8.75 (0.3445) 8.55 (0.3366) 1.27 (0.0500) bsc seating plane 0.25 (0.0098) 0.10 (0.0039) 0.51 (0.0201) 0.31 (0.0122) 1.75 (0.0689) 1.35 (0.0531) 0.50 (0.0197) 0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) 0.25 (0.0098) 0.17 (0.0067) coplanarity 0.10 8 0 45 figure 65. 14-lead standard small outline package [soic_n] (r-14) dimensions shown in millimeters and (inches)
ad8601/ad8602/ad8604 rev. g | page 21 of 24 compliant to jedec standards mo-153-ab-1 061908-a 8 0 4.50 4.40 4.30 14 8 7 1 6.40 bsc pin 1 5.10 5.00 4.90 0.65 bsc 0.15 0.05 0.30 0.19 1.20 max 1.05 1.00 0.80 0.20 0.09 0.75 0.60 0.45 coplanarity 0.10 seating plane figure 66. 14-lead thin shrink small outline package [tssop] (ru-14) dimensions shown in millimeters compliant to jedec standards mo-137-ab controlling dimensions are in inches; millimeter dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design. 16 9 8 1 seating plane 0.010 (0.25) 0.004 (0.10) 0.012 (0.30) 0.008 (0.20) 0.025 (0.64) bsc 0.041 (1.04) ref 0.010 (0.25) 0.006 (0.15) 0.050 (1.27) 0.016 (0.41) 0.020 (0.51) 0.010 (0.25) 8 0 coplanarity 0.004 (0.10) 0.065 (1.65) 0.049 (1.25) 0.069 (1.75) 0.053 (1.35) 0.197 (5.00) 0.193 (4.90) 0.189 (4.80) 0.158 (4.01) 0.154 (3.91) 0.150 (3.81) 0.244 (6.20) 0.236 (5.99) 0.228 (5.79) 01-28-2008-a figure 67. 16-lead shrink small outline package [qsop] (rq-16) dimensions shown in inches and (millimeters)
ad8601/ad8602/ad8604 rev. g | page 22 of 24 ordering guide model 1 , 2 temperature range package description package option branding ad8601artz-r2 ?40c to +125c 5-lead sot-23 rj-5 aaa ad8601artz-reel ?40c to +125c 5-lead sot-23 rj-5 aaa ad8601artz-reel7 ?40c to +125c 5-lead sot-23 rj-5 aaa ad8601wartz-rl ?40c to +125c 5-lead sot-23 rj-5 aaa ad8601wartz-r7 ?40c to +125c 5-lead sot-23 rj-5 aaa ad8601wdrtz-reel ?40c to +125c 5-lead sot-23 rj-5 aad ad8601wdrtz-reel7 ?40c to +125c 5-lead sot-23 rj-5 aad ad8602ar ?40c to +125c 8-lead soic_n r-8 ad8602ar-reel ?40c to +125c 8-lead soic_n r-8 ad8602ar-reel7 ?40c to +125c 8-lead soic_n r-8 ad8602arz ?40c to +125c 8-lead soic_n r-8 ad8602arz-reel ?40c to +125c 8-lead soic_n r-8 ad8602arz-reel7 ?40c to +125c 8-lead soic_n r-8 ad8602warz-rl ?40c to +125c 8-lead soic_n r-8 ad8602warz-r7 ?40c to +125c 8-lead soic_n r-8 ad8602arm-reel ?40c to +125c 8-lead msop rm-8 aba ad8602armz ?40c to +125c 8-lead msop rm-8 aba ad8602armz-reel ?40c to +125c 8-lead msop rm-8 aba ad8602dr ?40c to +125c 8-lead soic_n r-8 ad8602dr-reel ?40c to +125c 8-lead soic_n r-8 ad8602dr-reel7 ?40c to +125c 8-lead soic_n r-8 ad8602drz ?40c to +125c 8-lead soic_n r-8 ad8602drz-reel ?40c to +125c 8-lead soic_n r-8 AD8602DRZ-REEL7 ?40c to +125c 8-lead soic_n r-8 ad8602drm-reel ?40c to +125c 8-lead msop rm-8 abd ad8602drmz-reel ?40c to +125c 8-lead msop rm-8 abd ad8604arz ?40c to +125c 14-lead soic_n r-14 ad8604arz-reel ?40c to +125c 14-lead soic_n r-14 ad8604arz-reel7 ?40c to +125c 14-lead soic_n r-14 ad8604drz ?40c to +125c 14-lead soic_n r-14 ad8604drz-reel ?40c to +125c 14-lead soic_n r-14 ad8604aruz ?40c to +125c 14-lead tssop ru-14 ad8604aruz-reel ?40c to +125c 14-lead tssop ru-14 ad8604dru ?40c to +125c 14-lead tssop ru-14 ad8604dru -reel ?40c to +125c 14-lead tssop ru-14 ad8604druz ?40c to +125c 14-lead tssop ru-14 ad8604druz-reel ?40c to +125c 14-lead tssop ru-14 ad8604arqz ?40c to +125c 16-lead qsop rq-16 ad8604arqz-rl ?40c to +125c 16-lead qsop rq-16 ad8604arqz-r7 ?40c to +125c 16-lead qsop rq-16 1 z = rohs compliant part. 2 w = qualified for auto motive applications. automotive products the ad8601w/ad8602w models are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. note that these automotive models may have specifications that differ from the commercial models; ther efore, designers should review the specifications section of this data sheet carefully. only the automotive grade products shown are a vailable for use in automotive applications. contact your local analog devices account representative for specific product ordering informat ion and to obtain the specific automotive reliability reports for these models.
ad8601/ad8602/ad8604 rev. g | page 23 of 24 notes
ad8601/ad8602/ad8604 rev. g | page 24 of 24 notes ?20 0C2011 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d01525-0-1/11(g)

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