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dual/quad single-supply operational amplifiers op292/op492 rev. c 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 ?1993C2009 analog devices, inc. all rights reserved. features single-supply operation: 4.5 v to 33 v input common-mode includes ground output swings to ground high slew rate: 3 v/s high gain bandwidth: 4 mhz low input offset voltage high open-loop gain no phase inversion applications disk drives mobile phones servo controls modems and fax machines pagers power supply monitors and controls battery-operated instrumentation pin configurations outa 1 ?ina 2 +ina 3 ?v 4 +v 8 outb 7 ?inb 6 +inb 5 op292 top view (not to scale) 00310-00 figure 1. 8-lead narrow-body soic (s-suffix) outa 1 ?ina 2 +ina 3 +v 4 outd 14 ?ind 13 +ind 12 ?v 11 +inb 5 +inc 10 ?inb 6 ?inc 9 outb 7 outc 8 op492 top view (not to scale) 00310-002 figure 2. 14-lead narrow-body soic (s-suffix) general description the op292/op492 are low cost, general-purpose dual and quad operational amplifiers designed for single-supply applications and are ideal for 5 v systems. fabricated on analog devices, inc., cbcmos process, the op292/op492 series has a pnp input stage that allows the input voltage range to include ground. a bicmos output stage enables the output to swing to ground while sinking current. the op292/op492 series is unity-gain stable and features an outstanding combination of speed and performance for single- or dual-supply operation. the op292/op492 provide a high slew rate, high bandwidth, with open-loop gain exceeding 40,000 and offset voltage under 800 (op292) and 1 mv (op492). with these combinations of features and low supply current, the op292/op492 series is an excellent choice for battery-operated applications. the op292/op492 series performance is specified for single- or dual-supply voltage operation over the extended industrial temperature range (?40c to +125c).
op292/op492 rev. c | page 2 of 20 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? pin configurations ........................................................................... 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? electrical characteristics ............................................................. 3 ? absolute maximum ratings ............................................................ 6 ? thermal resistance ...................................................................... 6 ? esd caution .................................................................................. 6 ? typical performance characteristics ............................................. 7 ? applications information .............................................................. 13 ? phase reversal ............................................................................. 13 ? power supply considerations ................................................... 13 ? typical applications ....................................................................... 14 ? direct access arrangement for telephone line interface ... 14 ? single-supply instrumentation amplifier .............................. 14 ? dac output amplifier .............................................................. 14 ? 50 hz/60 hz single-supply notch filter ................................. 15 ? four-pole bessel low-pass filter ............................................. 15 ? low cost, linearized thermistor amplifier .............................. 15 ? single-supply ultrasonic clamping/limiting receiver amplifier ..................................................................................... 16 ? precision single-supply voltage comparator ........................ 16 ? programmable precision window comparator .................... 16 ? outline dimensions ....................................................................... 17 ? ordering guide .......................................................................... 17 ? revision history 5/09rev. b to rev. c deleted 8-lead pdip and 14-lead pdip ........................ universal changes to features section and general description section . 1 changed v s = 5 v to v s = 15 v .................................................... 4 changes to table 3 and table 4 ....................................................... 6 changes to figure 21 caption and figure 24 caption .............. 10 changes to figure 29 ...................................................................... 11 changes to figure 35 ...................................................................... 13 deleted op292 spice macro-model section ............................. 14 changes to figure 38 ...................................................................... 14 changes to figure 39 and figure 41 ............................................. 15 deleted op492 spice macro-model section ............................. 16 changes to figure 44 ...................................................................... 16 updated outline dimensions ....................................................... 17 changes to ordering guide .......................................................... 17 10/02rev. a to rev. b edits to outline dimensions ......................................................... 18 1/02rev. 0 to rev. a deleted wafer test limits ............................................................... 4 deleted dice characteristics ........................................................... 4 edits to ordering guide ................................................................ 20
op292/op492 rev. c | page 3 of 20 specifications electrical characteristics v s = 5 v, v cm = 0 v, v o = 2 v, t a = 25c, unless otherwise noted. table 1. parameter symbol conditions min typ max unit input characteristics offset voltage op292 v os 0.1 0.8 mv ?40c t a +85c 0.3 1.2 mv ?40c t a +125c 0.5 2.5 mv op492 v os 0.1 1 mv ?40c t a +85c 0.3 1.5 mv ?40c t a +125c 0.5 2.5 mv input bias current i b 450 700 na ?40c t a +85c 0.75 2.5 a ?40c t a +125c 3.0 5.0 a input offset current i os 7 50 na ?40c t a +85c 100 700 na ?40c t a +125c 0.4 1.2 a input voltage range 0 4.0 v common-mode rejection ratio cmrr v cm = 0 v to 4.0 v 75 95 db ?40c t a +85c 70 93 db ?40c t a +125c 65 90 db large signal voltage gain a vo r l = 10 k, v o = 0.1 v to 4 v 25 200 v/mv ?40c t a +85c 10 100 v/mv ?40c t a +125c 5 50 v/mv offset voltage drift v os /t ?40c t a +125c 2 10 v/c long-term v os drift 1 v os /t 1 v/month bias current drift i b /t ?40c t a +85c 6 pa/c ?40c t a +125c 400 pa/c offset current drift i os /t ?40c t a +85c 1.5 pa/c ?40c t a +125c 2 pa/c output characteristics output voltage swing high v out r l = 100 k to gnd ?40c t a +125c 4.0 4.3 v r l = 2 k to gnd 3.8 4.1 v ?40c t a +125c 3.7 3.9 v low v out r l = 100 k to v+ 8 20 mv ?40c t a +125c 12 20 mv r l = 2 k to v+ 280 450 mv ?40c t a +125c 300 550 mv short-circuit current limit i sc 5 8 ma power supply power supply rejection ratio psrr v s = 4.5 v to 30 v, v o = 2 v 75 95 db ?40c t a +125c 70 90 db supply current per amp i sy v o = 2 v 0.8 1.2 ma
op292/op492 rev. c | page 4 of 20 parameter symbol conditions min typ max unit dynamic performance slew rate sr r l = 10 k 3 v/s ?40c t a +125c 1 2 v/s gain bandwidth product gbp 4 mhz phase margin m 75 degrees channel separation cs f o = 1 khz 100 db noise performance voltage noise e n p-p 0.1 hz to 10 hz 25 v p-p voltage noise density e n f = 1 khz 15 nv/hz current noise density i n 0.7 pa/hz 1 long-term offset voltage drift is guarant eed by 1,000 hours life test performed on three independe nt wafer lots at 125c with ltpd of 1.3. v s =15 v, v cm = 0 v, v o = 2 v, t a = 25c, unless otherwise noted. table 2. parameter symbol conditions min typ max unit input characteristics offset voltage op292 v os 1.0 2.0 mv ?40c t a +85c 1.2 2.5 mv ?40c t a +125c 1.5 3 mv op492 v os 1.4 2.5 mv ?40c t a +85c 1.7 2.8 mv ?40c t a +125c 2 3 mv input bias current i b 375 700 na ?40c t a +125c 0.5 1 a input offset current i os 7 50 na ?40c t a +85c 20 100 na ?40c t a +125c 0.4 1.2 a input voltage range 1 ?11 +11 v common-mode rejection ratio cmrr v cm = 11 v 78 100 db ?40c t a +125c 75 95 db large signal voltage gain a vo r l = 10 k, v o =10 v 25 120 v/mv ?40c t a +85c 10 75 v/mv ?40c t a +125c 5 60 v/mv offset voltage drift v os /t ?40c t a +125c 4 10 v/c bias current drift i b /t ?40c t a +125c 3 pa/c output characteristics output voltage swing v o r l = 2 k to gnd 11 12.2 v ?40c t a +125c 10 11 v r l = 100 k to gnd 13.8 14.3 v ?40c t a +125c 13.5 14.0 mv short-circuit current limit i sc short circuit to gnd 8 10.5 ma power supply power supply rejection ratio psrr v s = 2.25 v to 15 v 75 86 db ?40c t a +125c 70 83 db supply current per amp i sy v o = 0 v 1 1.4 ma
op292/op492 rev. c | page 5 of 20 parameter symbol conditions min typ max unit dynamic performance slew rate sr r l =10 k 2.5 4 v/s ?40c t a +125c 2 3 v/s gain bandwidth product gbp 4 mhz phase margin m 75 degrees channel separation cs f o = 1 khz 100 db noise performance voltage noise e n p-p 0.1 hz to 10 hz 25 v p-p voltage noise density e n f = 1 khz 15 nv/hz current noise density i n 0.7 pa/hz 1 input voltage range is guaranteed by cmrr tests.
op292/op492 rev. c | page 6 of 20 absolute maximum ratings table 3. parameter rating supply voltage 33 v input voltage range 1 ?15 v to +14 v differential input voltage 1 v 1 output short-circuit duration unlimited storage temperature range ?65c to +150c operating temperature range ?40c to +125c junction temperature range ?65c to +125c lead temperature range (soldering, 60 sec) 300c 1 for supply voltages less than 36 v, the absolute maximum input 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. thermal resistance ja is specified for the worst-case conditions, that is, a device soldered in the circuit board for the surface-mount packages. table 4. thermal resistance package type ja jc unit 8-lead soic 158 43 c/w 14-lead soic 120 36 c/w esd caution
op292/op492 rev. c | page 7 of 20 typical performance characteristics 200 0 50 25 100 75 125 150 175 units 500 ?400 400 ?500 300200 100 0 ?100 ?200 ?300 input offset voltage, v os (v) v s = 5v v cm = 0v t a = 25c 720 op amps 00310-003 figure 3. op292 input offset voltage distribution @ 5 v 320 280 240 200 160 120 80 40 0 units 2.0 0.2 1.8 01 1.41.2 1.00.8 0.6 0.4 input offset voltage, v os (mv) . 6 v s = 15v v cm = 0v t a = 25c 720 op amps 00310-004 figure 4. op292 input offset voltage distribution @ 15 v 160 140 120 100 80 60 40 20 0 units 4.0 0.4 3.6 03 2.82.4 2.01.6 1.2 0.8 tcv os (v/c) . 2 00310-005 v s = 5v v cm = 0v ?40c t a +125c 600 op amps figure 5. op292 temperature drift (tcv os ) distribution @ 5 v input offset voltage, v os (mv) units 160 40 20 80 60 100 120 140 0.6 ?0.4 0.5 ?0.5 0.4 0.30.20.1 0 ?0.1?0.2?0.3 v s = 5v v cm = 0v t a = 25c 600 op amps 0 00310-006 figure 6. op492 input offset voltage distribution @ 5 v input offset voltage, v os (mv) units 240 0 2.0 120 40 0.2 80 0 200 160 1.8 1.4 1.2 0.8 1.0 1.6 0.6 0.4 v s = 15v v cm = 0v t a = 25c 600 op amps 0 0310-007 figure 7. op492 input offset voltage distribution @ 15 v 160 0 5.0 40 20 0.5 0 80 60 100 120 140 4.54.0 3.5 3.02.52.0 1.5 1.0 units tcv os (v/c) v s = 5v v cm = 0v ?40c t a +125c 600 op amps 00310-008 figure 8. op492 temperature drift (tcv os ) distribution @ 5 v
op292/op492 rev. c | page 8 of 20 units 240 0 8 60 30 10 120 90 150 180 210 765432 v s = 5v v cm = 0v ?40c t a +125c 600 op amps tcv os (v/c) 00310-009 figure 9. op292 temperature drift (tcv os ) distribution @ 15 v 125 ?25 100 ?50 50 25 75 0 temperature (c) open-loop gain (v/mv) v s = 5v v o = 4v r l = 2k ? r l = 10k ? 600 0 300 100 200 500 400 00310-010 figure 10. op292 open-loop gain vs. temperature @ 5 v 125 ?25 100 ?50 50 25 75 0 temperature (c) open-loop gain (v/mv) v s = 15v v o = 10v r l = 2k ? r l = 10k ? 250 0 100 50 200 150 0 0310-011 figure 11. op292 open-loop gain vs. temperature @ 15 v 200 0 8 50 25 10 100 75 125 150 175 765432 units tcv os (v/c) 00310-012 v s = 15v v cm = 0v ?40c t a +125c 600 op amps figure 12. op492 temperature drift (tcv os ) distribution @ 15 v 900 0 125 200 100 ?25 ?50 300 400 500 600 700 800 100 75 50 25 0 temperature (c) open-loop gain (v/mv) v s = 5v v o = 4v r l = 2k ? r l = 10k ? 0 0310-013 figure 13. op492 open-loop gain vs. temperature @ 5 v 400 0 125 100 50 ?25 ?50 150 200 250 300 350 100 75 50 25 0 temperature (c) open-loop gain (v/mv) v s = 15v v o = 10v r l = 2k ? r l = 10k ? 0 0310-014 figure 14. op492 open-loop gain vs. temperature @ 15 v
op292/op492 rev. c | page 9 of 20 1.4 0.2 125 0.6 0.4 ?25 ?50 0.8 1.0 1.2 100 75 50 25 0 temperature (c) supply current per amplifier (ma) v s = 15v v s = +5v 0 0310-015 figure 15. op292 supply current per amplifier vs. temperature 6 0 125 2 1 ?25 ?50 3 4 5 100 75 50 25 0 temperature (c) slew rate (v/s) v s = 15v v o = 10v v s = 5v v o = 0.1v, 4v +sr ?sr +sr ?sr 0 0310-016 figure 16. op292 slew rate vs. temperature 90 40 ?10 10m 10k 1m 100k 1k 50 60 70 80 0 10 20 30 frequency (hz) gain (db) t a = 25c v+ = 5v v? = 0v r l = 10k ? phase margin = 83 gain phase 135 90 45 0 ?45 phase (degrees) 00310-017 figure 17. op292/op492 open-loop gain and phase vs. frequency @ 5 v 1.4 0.2 125 0.6 0.4 ?25 ?50 0.8 1.0 1.2 100 75 50 25 0 temperature (c) supply current per amplifier (ma) v s = 15v v s = +5v 0 0310-018 figure 18. op492 supply current per amplifier vs. temperature 6 0 125 2 1 ?25 ?50 3 4 5 100 75 50 25 0 temperature (c) slew rate (v/s) v s = 15v v o = 10v v s = 5v v o = 0.1v, 4v +sr ?sr +sr ?sr 0 0310-019 figure 19. op492 slew rate vs. temperature 10m 10k 1m 100k 1k frequency (hz) gain (db) t a = 25c r l = 10k ? v s = 10k ? phase margin = 92 gain phase +135 +90 +45 0 ?45 phase (degrees) 90 40 ?10 50 60 70 80 0 10 20 30 00310-020 figure 20. op292/op492 open-loop gain and phase vs. frequency @ 15 v
op292/op492 rev. c | page 10 of 20 40 ?10 10m 10k 1m 100k 1k 50 0 10 20 30 frequency (hz) closed-loop gain (db) t a = 25c v? = 0v v+ = 5v 00310-021 figure 21. op292/op492 closed-loop gain vs. frequency @ 5 v 100 0 1m 1k 100k 10k 100 120 20 40 60 80 frequency (hz) common-mode rejection (db) t a = 25c v? = 0v v+ = 5v 00310-022 figure 22. op292/op492 cmr vs. frequency @ 5 v 100 0 1m 1k 100k 10k 100 120 20 40 60 80 frequency (hz) power supply rejection (db) t a = 25c v s = 5v 00310-023 figure 23. op292/op492 psr vs. frequency @ 5 v 40 ?10 10m 10k 1m 100k 1k 50 0 10 20 30 frequency (hz) closed-loop gain (db) t a = 25c v s = 15v 00310-024 figure 24. op292/op492 closed-loop gain vs. frequency @ 15 v 100 0 1m 1k 100k 10k 100 120 20 40 60 80 frequency (hz) common-mode rejection (db) t a = 25c v s = 15v 00310-025 figure 25. op292/op492 cmr vs. frequency @ 15 v 100 0 1m 1k 100k 10k 100 120 20 40 60 80 frequency (hz) power supply rejection (db) t a = 25c v s = 15v +pssr ?pssr 00310-026 figure 26. op292/op492 psr vs. frequency @ 15 v
op292/op492 rev. c | page 11 of 20 4.8 125 4.0 3.8 ?25 ?50 4.2 4.4 4.6 100 75 50 25 0 temperature (c) output voltage swing (v) v s = 5v r l = 100k ? r l = 10k ? r l = 2k ? 0 0310-027 figure 27. op292/op492 v out swing vs. temperature @ 5 v 10 0.1 125 ?25 ?50 1 100 75 50 25 0 temperature (c) input bias current (a) v s = 5v v cm = 0v op492 op292 00310-028 figure 28. op292/op492 input bias current vs. temperature @ 5 v ?120 100k 10 1k 10k 100 0 ? 40 ?110 ?100 ?80 ?90 ?60 frequency (hz) channel separation (db) r l = 2k ? v s = +5v, 15v v o = 3v p-p 00310-029 figure 29. op292/op492 channel separation 15.0 125 ?14.5 ?15.0 ?25 ?50 ?14.0 10.0 11.0 12.0 13.0 14.0 100 75 50 25 0 temperature (c) output swing (v) ?output swing (v) v s = 15v r l = 100k ? r l = 10k ? r l = 2k ? r l = 2k ? r l = 100k ? r l = 10k ? 00310-030 figure 30. op292/op492 v out swing vs. temperature @ 15 v 600 125 200 100 0 ?25 ?50 300 400 500 100 75 50 op292 op492 25 0 temperature (c) input bias current (na) v s = 15v v cm = 0v 0 0310-031 figure 31. op292/op492 input bias current vs. temperature @ 15 v 0.50 0.18 0.26 0.22 0.34 0.30 0.38 0.42 0.46 0.48 0.24 0.20 0.32 0.28 0.36 0.40 0.44 ?rail +rail +15v ?15v a v 15 13 11 1 9753 21 01 10 864 v in (v) i b current (na) 4 2 in 00310-032 figure 32. op292/op492 i b current vs. common-mode voltage
op292/op492 rev. c | page 12 of 20 ch a 800dv fs 100dv/div mkr: 16.9v/hz 0hz mkr: 1000hz 25khz bw: 150hz 00310-033 figure 33. voltage noise density
op292/op492 rev. c | page 13 of 20 applications information phase reversal the op492 has built-in protection against phase reversal when the input voltage goes to either supply rail. in fact, it is safe for the input to exceed either supply rail by up to 0.6 v with no risk of phase reversal. however, the input should not go beyond the positive supply rail by more than 0.9 v; otherwise, the output will reverse phase. if this condition occurs, the problem can be fixed by adding a 5 k current limiting resistor in series with the input pin. with this addition, the input can go to more than 5 v beyond the positive rail without phase reversal. an input voltage that is as much as 5 v below the negative rail will not result in phase reversal. op492 2k? 5v 0 v 11.8v p-p 1v 90 100 10 5s 0% 00310-034 figure 34. output phase reverse if input exceeds the positive supply (v+) by more than 0.9 v 2k? 5v 0v 10v p-p 1v/div op492 00310-035 4ms/div figure 35. no negative rail phase reversal, even with input signal at 5 v below ground power supply considerations the op292/op492 are designed to operate equally well at single +5 v or 15 v supplies. the lowest supply voltage recommended is 4.5 v. it is a good design practice to bypass the supply pins with a 0.1 f ceramic capacitor. it helps improve filtering of high frequency noise. for dual-supply operation, the negative supply (v?) must be applied at the same time, or before v+. if v+ is applied before v?, or in the case of a loss of the v? supply, while either input is connected to ground or another low impedance source, excessive input current may result. potentially damaging levels of input current can destroy the amplifier. if this condition can exist, simply add a l k or larger resistor in series with the input to eliminate the problem.
op292/op492 rev. c | page 14 of 20 typical applications direct access arrangement for telephone line interface figure 36 shows a 5 v single-supply transmit/receive telephone line interface for a modem circuit. it allows full duplex transmission of modem signals on a transformer-coupled 600 v line in a differential manner. the transmit section gain can be set for the specific modem device output. similarly, the receive amplifier gain can be appropriately selected based on the modem device input requirements. the circuit operates on a single 5 v supply. the standard value resistors allow the use of a sip-packaged resistor array; coupled with a quad op amp in a single package, this offers a compact, low part count solution. 5v dc 6.2v 6.2v t1 1:1 to telephone line 0.1f 50k? 10f modem tx gain adjust rx gain adjust 0.1f 300k ? 20k ? 20k ? 20k? 20k? 20k ? 20k ? 0.1f 20k? 100pf 5k? 5k? 1/4 op492 1/4 op492 1/4 op492 5v transmit txa receive rxa 300k ? 20k? 50k ? 00310-036 figure 36. universal direct access arrangement for telephone line interface single-supply instrumentation amplifier a low cost, single-supply instrumentation amplifier can be built as shown in figure 37 . the circuit uses two op amps to form a high input impedance differential amplifier. gain can be set by selecting resistor r g , which can be calculated using the transfer function equation. normally, v ref is set to 0 v. then the output voltage is a function of the gain times the differential input voltage. however, the output can be offset by setting v ref from 0 v to 4 v, as long as the input common-mode voltage of the amplifier is not exceeded. v in v ref 8 v out 5 v 7 4 1 5 v out = 5 + 40k? r g r g +v ref 20k ? 5k? 20k? 5k? 1/2 op292 1/2 op292 00310-037 figure 37. single-supply instrumentation amplifier in this configuration, the output can swing to near 0 v; however, be careful because the common-mode voltage range of the input cannot operate to 0 v. this is because of the limitation of the circuit configuration where the first amplifier must be able to swing below ground to attain a 0 v common-mode voltage, which it cannot do. depending on the gain of the instrumentation amplifier, the input common-mode extends to within about 0.3 v of zero. the worst-case common-mode limit for a given gain can be easily calculated. dac output amplifier the op292/op492 are ideal for buffering the output of single- supply dacs. figure 38 shows a typical amplifier used to buffer the output of a cmos dac that is connected for single-supply operation. to do that, the normally current output 12-bit cmos dac (r-2r ladder type) is connected backward to produce a voltage output. this operating configuration necessitates a low voltage reference. in this case, a 1.235 v low power reference is used. the relatively high output impedance (10 k) is buffered by the op292, and at the same time, gained up to a much more usable level. the potentiometer provides an accurate gain trim for a 4.095 v full-scale, allowing 1 mv increment per lsb of control resolution. the dac8043 device comes in an 8-lead pdip package, providing a cost-effective, compact solution to a 12-bit analog channel. v dd clk sri 1 2 3 4 8 7 6 5 dac8043 5v 5v 5 v 7.5k ? 1.235v ad589 nc digital control 500k ? 8.45k ? v out 20k? 1/2 op292 1mv/lsb 0v ? 4.095v fs v ref r fb i out gnd ld ld sri sri clk clk v dd 00310-038 figure 38. 12-bit single-supply dac with serial bus control
op292/op492 rev. c | page 15 of 20 50 hz/60 hz single-supply notch filter figure 39 shows a notch filter that achieves nearly 30 db of 60 hz rejection while powered by only a single 12 v supply. the circuit also works well on 5 v systems. the filter uses a twin-t configuration, whose frequency selectivity depends heavily on the relative matching of the capacitors and resistors in the twin-t section. mylar is a good choice for the capacitors of the twin-t, and the relative matching of the capacitors and resistors determines the pass-band symmetry of the filter. using 1% resistors and 5% capacitors produces satisfactory results. the amount of rejection and the q of the filter is solely determined by one resistor and is shown in the table with figure 39 . the bottom amplifier is used to split the supply to bias the amplifier to midlevel. the circuit can be modified to reject 50 hz by simply changing the resistors in the twin-t section (rl through r4) from 2.67 k to 3.16 k and by changing r5 to ? of 3.16 k. for best results, the common value re sistors can be from a resistor array for optimum matching characteristics. 1/4 op492 c1 1f c3 2f (1f 2) r5 1.335k ? (2.67k 2) r4 2.67k ? c2 1f r6 100k ? 8k? 12v 12v r8 100k ? r9 100k ? c4 1f 6v r7 1k ? v in v out notes 1. for 50hz application change r12 to r4 to 3.16k ? and r5 to 1.58k ? (3.16k ? 2) filter q 0.75 1.00 1.25 2.50 5.00 10.00 r q (k ? ) 1.0 2.0 3.0 8.0 18 38 rejection (db) 40 35 30 25 20 15 voltage gain 1.33 1.50 1.60 1.80 1.90 1.95 1/4 op492 1/4 op492 r3 2.67k ? r1 2.67k ? r q + 00310-039 r2 2.67k ? figure 39. single-supply 50 hz/60 hz notch filter four-pole bessel low-pass filter the linear phase filter in figure 40 is designed to roll off at a voice-band cutoff frequency of 3.6 khz. the four poles are formed by two cascading stages of 2-pole sallen-key filters. 5v 5k ? 5k ? 1.78k ? 16.2k ? 100f 2 3 1 8 4 6 5 7 5v v in v out 1.1k ? 14.3k ? 0.01f 0.022f 3300pf 2200pf 1/2 op292 1/2 op292 00310-040 figure 40. four-pole bessel low-pass filter using sallen-key topology low cost, linearized thermistor amplifier an inexpensive thermometer amplifier circuit can be implemented using low cost thermistors. one such implementation is shown in figure 41 . the circuit measures temperature over the range of 0c to 70c to an accuracy of 0.3c as the linearization circuit works well within a narrow temperature range. however, it can measure higher temperatures but at a slightly reduced accuracy. to achieve the aforementioned accuracy, the nonlinearity of the thermistor must be corrected. this is done by connecting the thermistor in parallel with the 10 k in the feedback loop of the first stage amplifier. a constant operating current of 281 a is supplied by the resistor r1 with the 5 v reference from the ref195 such that the self-heating error of the thermistor is kept below 0.1c. in many cases, the thermistor is placed some distance from the signal conditioning circuit. under this condition, a 0.1 f capacitor placed across r2 will help to suppress noise pickup. this linearization network creates an offset voltage that is corrected by summing a compensating current with potentiometer p1. the temperature dependent signal is amplified by the second stage, producing a transfer coefficient of ?10 mv/c at the output. to calibrate, a precision decade box can be used in place of the thermistor. for 0c trim, the decade box is set to 32.650 k, and p1 is adjusted until the output of the circuit reads 0 v. to trim the circuit at the full-scale temperature of 70c, the decade box is then set to 1.752 k, and p2 is adjusted until the circuit reads ?0.70 v. ref195 15v 5v 1f r1 2 17.8k ? r1 2 17.8k ? r t 1 10k ? ntc r5 806k ? r4 41.2k ? r3 10k ? r6 7.87k ? p2 200 ? 70c trim v out ?10mv/c notes 1. all resistors are 1%, 25ppm/c except r5 = 1%, 100ppm/c. 1 r t = alpha thermistor 13a1002-c3. 2 r1 = 0.1% imperial astronics m015. p1 10k ? 0c trim 1.0f 1/2 op292 1/2 op292 00310-041 figure 41. low cost linearized thermistor amplifier
op292/op492 rev. c | page 16 of 20 single-supply ultrasonic clamping/limiting receiver amplifier precision single-supply voltage comparator figure 42 shows an ultrasonic receiver amplifier using the nonlinear impedance of low cost diodes to effectively control the gain for wide dynamic range. this circuit amplifies a 40 khz ultrasonic signal through a pair of low cost clamping amplifiers before feeding a band-pass filter to extract a clean 40 khz signal for processing. the op292/op492 have excellent overload recovery characteristics, making them suitable for precision comparator applications. figure 43 shows the saturation recovery characteristics of the op492. the amplifier exhibits very little propagation delay. the amplifier compares a signal to precisely <0.5 mv offset error. 2k? 1k? 20k? 2.21k ? +5v 3v p-p ?15v 1v 90 100 10 5s 5v 0% op492 00310-043 the signal is ac-coupled into the false-ground bias node by virtue of the capacitive piezoelectric sensing element. rather than using an amplifier to generate a supply splitting bias, the false ground voltage is generated by a low cost resistive voltage divider. each amplifier stage provides ac gain while passing on the dc self-bias. as long as the output signal at each stage is less than the forward voltage of a diode, each amplifier has unrestricted gain to amplify low level signals. however, as the signal strength increases, the feedback diodes begin to conduct, shunting the feedback current, and thus reducing the gain. although distorting the waveform, the diodes effectively maintain a relatively constant amplitude even with large signals that otherwise would saturate the amplifier. in addition, this design is considerably more stable than the feedback type agc. figure 43. op492 has fast overload recovery for comparator applications programmable precision window comparator the op292/op492 can be used for precise level detection, such as in test equipment where a signal is measured within a range (see figure 44 ). a pair of 12-bit dacs sets the threshold voltage level. the dacs have serial interface, which minimizes interconnection requirements. the dac8512 has a control resolution of 1 mv/bit. therefore, for 5 v supply operation, the maximum dac output is 4.095 v. however, the op292 accepts a maximum input of 4.0 v. the overall circuit has a gain range from ?2 to ?400, where the inversion comes from the band-pass filter stage. operating with a q of 5, the filter restores a clean, undistorted signal to the output. the circuit also works well with 5 v supply systems. 12 v 600k ? 1m ? receiver panasonic efr-rtb40k2 12v 390k ? 10k? 0.01f 7.5v 12v 100k ? 10k ? 0.01f 14k? 0.01f 6.04k ? 68pf 1f 12v 600k ? 1m ? 7.5v v out 68pf 1/4 op492 1/4 op492 1/4 op492 00310-042 56.2k ? 1 2 3 4 8 7 6 5 1 2 3 4 8 7 6 5 decode cs clk sdi ld a nalog input clr 5v 5v 2 3 6 5 7 low high 8 4 1 5 v 1/2 op292 1/2 op292 control ref dac8512 dac8512 control ref dac dac 00310-044 figure 42. 40 khz ultrasonic clamping/limiting receiver amplifier figure 44. programmable window comparator with 12-bit threshold level control
op292/op492 rev. c | page 17 of 20 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-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 45. 8-lead standard small outline package [soic_n] narrow body (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 46. 14-lead standard small outline package [soic_n] narrow body (r-14) dimensions shown in millimeters and (inches) ordering guide model temperature range packag e description package option op292gs ?40c to +125c 8-lead narrow body soic_n r-8 op292gs-reel ?40c to +125c 8- lead narrow body soic_n r-8 op292gsz 1 ?40c to +125c 8-lead narrow body soic_n r-8 op292gsz-reel 1 ?40c to +125c 8-lead narrow body soic_n r-8 op492gs ?40c to +125c 14-lead narrow body soic_n r-14 op492gs-reel ?40c to +125c 14- lead narrow body soic_n r-14 op492gsz 1 ?40c to +125c 14-lead narrow body soic_n r-14 op492gsz-reel 1 ?40c to +125c 14-lead narrow body soic_n r-14 1 z = rohs compliant part.
op292/op492 rev. c | page 18 of 20 notes
op292/op492 rev. c | page 19 of 20 notes
op292/op492 rev. c | page 20 of 20 notes ?1993C2009 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d00310-0-5/09(c)

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