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dual precision, low cost, high speed bifet op amp AD712-EP 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 ?2010 analog devices, inc. all rights reserved. features supports defense and aerospace applications (aqec standard) military temperature range (?55c to +125c) controlled manufacturing baseline one assembly/test site one fabrication site enhanced product change notification qualification data available on request enhanced replacement for lf412 and tl082 ac performance settles to 0.01% in 1.0 s 16 v/s minimum slew rate 3 mhz minimum unity-gain bandwidth dc performance 150 v/mv minimum open-loop gain available in a soic_n package connection diagram 8 7 6 5 1 2 3 4 output v+ output v? AD712-EP amplifier no. 2 a mplifier no. 1 inverting input noninvertin g input inverting input noninverting input 09285-001 figure 1. 8-lead soic_n (r-suffix) general description the AD712-EP is a high speed, precision, monolithic operational amplifier offering high performance over the military temperature range of ?55c to +125c. its low offset voltage and offset voltage drift are the results of advanced laser wafer trimming technology. these performance benefits allow the user to easily upgrade existing designs that use older precision bifet or bipolar op amps. the superior ac and dc performance of this op amp makes it suitable for active filter applications. with a slew rate of 16 v/s and a settling time of 1 s to 0.01%, the AD712-EP is ideal as a buffer for 12-bit digital-to-analog converters (dacs) and 12-bit analog-to-digital converters (adcs) and as a high speed integrator. the combination of excellent noise performance and low input current also make the AD712-EP useful for photodiode preamps. common-mode rejection of 88 db and open-loop gain of 400 v/mv ensure 12-bit performance even in high speed unity- gain buffer circuits. the AD712-EP is available in an 8-lead soic_n package. additional applications information is available in the ad712 data sheet.
AD712-EP rev. 0 | page 2 of 12 table of contents features .............................................................................................. 1 connection diagram ....................................................................... 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 absolute maximum ratings ............................................................5 esd caution...................................................................................5 typical performance characteristics ..............................................6 outline dimensions ....................................................................... 10 ordering guide .......................................................................... 10 revision history 8/10revision 0: initial version
AD712-EP rev. 0 | page 3 of 12 specifications v s = 15 v @ t a = 25c, unless otherwise noted. table 1. parameter min typ max unit input offset voltage 1 initial offset 0.3 3 mv t min to t max 4 mv vs. temperature 7 20 v/c vs. supply 76 95 db t min to t max 76 db long-term offset stability 15 v/month input bias current 2 v cm = 0 v 25 75 pa v cm = 0 v @ t max 26 77 na v cm = 10 v 100 pa input offset current v cm = 0 v 10 25 pa v cm = 0 v @ t max 11 26 na matching characteristics input offset voltage 3 mv t min to t max 4 mv input offset voltage drift 20 v/c input bias current 25 pa crosstalk at f = 1 khz 120 db at f = 100 khz 90 db frequency response small signal bandwidth 3.0 4.0 mhz full power response 200 khz slew rate 16 20 v/s settling time to 0.01% 1.0 1.2 s total harmonic distortion 0.0003 % input impedance differential 3 10 12 ||5.5 ||pf common mode 3 10 12 ||5.5 ||pf input voltage range differential 3 20 v common-mode voltage 4 +14.5, ?11.5 v t min to t max ?v s + 4 +v s ? 2 v common-mode rejection ratio v cm = 10 v 76 88 db t min to t max 76 84 db v cm = 11 v 70 84 db t min to t max 70 80 db input voltage noise 0.1 hz to 10 hz 2 v p-p f = 10 hz 45 nv/hz f = 100 hz 22 nv/hz f = 1 khz 18 nv/hz f = 10 khz 16 nv/hz input current noise f = 1 khz 0.01 pa/hz
AD712-EP rev. 0 | page 4 of 12 parameter min typ max unit open-loop gain 150 v/mv t min to t max 100 v/mv output characteristics output voltage swing high 13.9 13.0 v t min to t max 12.0 v output voltage swing low ?12.5 ?13.1 v t min to t max ?12.0 v current 25 ma power supply rated performance 15 v operating range 4.5 18 v quiescent current 5.0 6.8 ma 1 input offset voltage specifications are gua ranteed after 5 minutes of operation at t a = 25c. 2 bias current specifications are guaranteed maximum at either input after 5 minutes of operation at t a = 25c. for higher temperatures, the current doubles every 10c. 3 defined as voltage between inputs, such that neither exceeds 10 v from ground. 4 typically exceeding ?14.1 v negative common-mode voltage on either input results in an output phase reversal.
AD712-EP rev. 0 | page 5 of 12 absolute maximum ratings table 2. parameter rating supply voltage 18 v internal power dissipation 1 input voltage 2 18 v output short-circuit duration indefinite differential input voltage +v s and ?v s storage temperature range ?65c to +125c operating temperature range ?55c to +125c lead temperature range (soldering 60 sec) 300c 1 thermal characteristics: 8-lead soic_n, ja = 100c. 2 for supply voltages less than 18 v, the absolute maximum voltage is equal to the supply voltage. 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
AD712-EP rev. 0 | page 6 of 12 typical performance characteristics supply voltage v input voltage swing (v) 20 15 0 10 5 051 0 15 20 r l = 2k ? 25c 09285-002 figure 2. input voltage swing vs. supply voltage supply voltage v output voltage swing (v) 20 15 0 05 10 5 10 15 20 +v out ?v out r l = 2k ? 25c 09285-003 figure 3. output voltage swing vs. supply voltage load resistance ( ? ) output voltage swing (v p-p) 30 25 0 15 10 5 20 10 100 1k 10k 15v supplies 09285-004 figure 4. output voltage swing vs. load resistance quiescent current (ma) supply voltage v 6 5 2 4 3 0 5 10 15 20 09285-005 figure 5. quiescent current vs. supply voltage temperature (c) ?60 input bias current ( v cm = 0) (amps) 10 10 10 11 10 12 10 6 10 7 10 8 10 9 ?40 ?20 0 20 40 60 80 100 120 140 09285-006 figure 6. input bias current vs. temperature frequency (hz) output impedance ( ? ) 0.01 1k 1.0 0.1 10 100 10k 100k 1m 10m 09285-007 figure 7. output im pedance vs. frequency
AD712-EP rev. 0 | page 7 of 12 common-mode voltage (v) input bias current (pa) 100 75 0 50 25 ?10 max t grade limit ?5 0 5 10 v s = 15v 25c 09285-008 figure 8. input bias current vs. common-mode voltage ambient temperature (c) short-circuit current limit (ma) 10 ?60 12 14 16 18 20 22 24 26 ?40 ?20 0 20 40 60 80 100 120 140 + output current ? output current 09285-009 figure 9. short-circuit current limit vs. temperature unity-gain bandwidth (mhz) 3.0 3.5 4.0 4.5 5.0 temperature (c) ?60 ?40 ?20 0 20 40 60 80 100 120 140 09285-010 figure 10. unity-gain bandwidth vs. temperature open-loop gain (db) ?20 0 20 40 60 80 100 ?20 0 20 40 60 80 100 phase margin (degrees) frequency (hz) 10 100 1k 10k 100k 1m 10m gain phase 2k? 100pf load 09285-011 figure 11. open-loop gain and phase margin vs. frequency open-loop gain (db) 125 120 115 110 105 100 95 supply voltage v 0 5 10 15 20 r l = 2k ? 25c 09285-012 figure 12. open-loop gain vs. supply voltage power supply rejection (db) 110 0 100 80 60 40 20 v s = 15v supplies with 1v p-p sinewave 25c ? supply + supply supply modulation frequency (hz) 10 100 1k 10k 100k 1m 09285-013 figure 13. power supply rejection vs. frequency
AD712-EP rev. 0 | page 8 of 12 cmr (db) 0 100 80 60 40 20 v s = 15v v cm = 1v p-p 25c frequency (hz) 10 100 1k 10k 100k 1m 09285-014 figure 14. common-mode rejection (cmr) vs. frequency output voltage swing (v p-p) 30 25 0 15 10 5 20 frequency (hz) 100k 1m 10m r l = 2k ? 25c v s = 15v 09285-015 figure 15. large signal frequency response ?8 0.5 ?6 ?4 ?2 0 4 6 8 10 2 ?10 0.6 0.7 0.01% 0.1%1% 0.01% 0.1% 1% error output swing from 0v to volts 0.8 0.9 1.0 settling time (s) 09285-016 figure 16. output swing and error vs. settling time frequency (hz) thd (db) ? 70 ?80 ?90 ?100 ?110 ?120 ?130 100 1k 10k 100k 3v rms r l = 2k ? c l = 100pf 09285-017 figure 17. total harmonic distortion (thd) vs. frequency frequency (hz) 1 10 100 1k input noise voltage (nv/ hz) 10 100 1k 10k 100k 1 09285-018 figure 18. input noise voltage spectral density input error signal (mv) (at summing junction) 5 10 15 20 25 0 slew rate (v/s) 0 100 200 300 400 500 600 700 800 900 09285-019 figure 19. slew rate vs. input error signal
AD712-EP rev. 0 | page 9 of 12 25 15 20 slew rate (v/s) temperature (c) ?60 ?40 ?20 0 20 40 60 80 100 120 140 09285-020 figure 20. slew rate vs. temperature
AD712-EP rev. 0 | page 10 of 12 outline dimensions 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 21. 8-lead standard small outline package [soic_n] narrow body (r-8) dimensions shown in millimeters and (inches) ordering guide model 1 temperature range package description package option ad712trz-ep ?55c to +125c 8-lead soic_n r-8 ad712trz-ep-r7 ?55c to +125c 8-lead soic_n r-8 1 z = rohs compliant part.
AD712-EP rev. 0 | page 11 of 12 notes
AD712-EP rev. 0 | page 12 of 12 notes ?2010 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d09285-0-8/10(0)

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