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low voltage, micropower, quad operational amplifier OP490 rev. e 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 ?1987C2010 analog devices, inc. all rights reserved. features single/dual-supply operation 1.6 v to 36 v 0.8 v to 18 v single-supply operation; input and output voltage ranges include ground low supply current: 80 a maximum high output drive: 5 ma minimum low offset voltage: 1.0 mv maximum high open-loop gain: 800 v/mv typical industry-standard quad pinouts functional block diagrams out a 1 ?in a 2 +in a 3 v+ 4 out d 14 ?in d 13 +in d 12 v? 11 +in b 5 ?in b 6 out b 7 +in c 10 ?in c 9 out c 8 00308-001 top view (not to scale) OP490 figure 1. 14-lead plastic dip (p-suffix) out a 1 ?in a 2 +in a 3 v+ 4 out d 16 ?in d 15 +in d 14 v? 13 +in b 5 ?in b 6 out b nc 7 +in c 12 ?in c 11 out c nc nc = no connect 10 8 9 00308-002 top view (not to scale) OP490 figure 2. 16-lead soic (s-suffix) general description the OP490 is a high performance micropower quad op amp that operates from a single supply of 1.6 v to 36 v or from dual supplies of 0.8 v to 18 v. the input voltage range includes the negative rail allowing the OP490 to accommodate input signals down to ground in single-supply operation. the output swing of the OP490 also includes ground when operating from a single supply, enabling zero-in, zero-out operation. the quad OP490 draws less than 20 a of quiescent supply current per amplifier, but each amplifier is able to deliver over 5 ma of output current to a load. input offset voltage is under 0.5 mv. gain exceeds over 400,000 and cmr is better than 90 db. a psrr of under 5.6 v/v minimizes offset voltage changes experienced in battery-powered systems. the quad OP490 combines high performance with the space and cost savings of quad amplifiers. the minimal voltage and current requirements of the OP490 make it ideal for battery and solar-powered applications, such as portable instruments and remote sensors.
OP490 rev. e | page 2 of 16 table of contents features .............................................................................................. 1 ? functional block diagrams ............................................................. 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? electrical characteristics ............................................................. 3 ? absolute maximum ratings ............................................................ 5 ? thermal resistance ...................................................................... 5 ? esd caution .................................................................................. 5 ? typical performance characteristics ............................................. 6 ? applications information ................................................................ 9 ? battery-powered applications .....................................................9 ? single-supply output voltage range..........................................9 ? input voltage protection ........................................................... 10 ? micropower voltage-controlled oscillator ............................ 10 ? micropower single-supply quad voltage-output 8-bit dac ....................................................................................................... 11 ? high output amplifier .............................................................. 12 ? single-supply micropower quad programmable gain amplifier ..................................................................................... 12 ? outline dimensions ....................................................................... 14 ? ordering guide .......................................................................... 15 ? revision history 5/10rev. d to rev. e changes to features section............................................................ 1 changes to figure 24 ...................................................................... 12 7/09rev. c to rev. d deleted 14-lead cerdip (y-suffix) ............................... universal deleted figure 1, renumbered figures sequentially ................... 1 changes to table 1 ............................................................................ 3 changes to table 2 ............................................................................ 4 changes to figure 16 ........................................................................ 8 updated outline dimensions ....................................................... 14 changes to ordering guide .......................................................... 15 4/02rev. b to rev. c deleted 28-pin lcc (tc-suffix) pin connection diagram ...... 1 deleted electrical characteristics .................................................. 3 edits to absolute maximum ratings ............................................ 6 edits to ordering guide ............................................................... 16
OP490 rev. e | page 3 of 16 specifications electrical characteristics @ v s = 1.5 v to 15 v, t a = 25c, unless otherwise noted. table 1. parameter symbol conditions min typ max unit input characteristics input offset voltage v os 0.6 1.0 mv input offset current i os v cm = 0 v 0.4 5 na input bias current i b v cm = 0 v 4.2 25 na large signal voltage gain a vo v s = 15 v, v o = 10 v r l = 100 k 400 800 v/mv r l = 10 k 200 400 v/mv r l = 2 k 100 200 v/mv v+ = 5 v, v? = 0 v, 1 v < v o < 4 v r l = 100 k 100 250 v/mv r l = 10 k 70 140 v/mv input voltage range 1 ivr v+ = 5 v, v? = 0 v 0 4 v common-mode rejection ratio cmrr v+ = 5 v, v? = 0 v, 0 v < v cm < 4 v 80 100 db v s = 15 v, ?15 v < v cm < +13.5 v 90 120 db input resistance differential mode r in v s = 15 v 30 m input resistance common-mode r incm v s = 15 v 20 g output characteristics output voltage swing v o l v s = 15 v, r l = 10 k 13.5 14.2 v v s = 15 v, r l = 2 k 10.5 11.5 v output voltage high v oh v+ = 5 v, v? = 0 v, r l = 2 k 4.0 4.2 v output voltage low v ol v+ = 5 v, v? = 0 v, r l = 10 k 100 500 v capacitive load stability a v = 1 650 pf dynamic performance slew rate sr v s = 15 v 5 12 v/ms channel separation 2 cs f o = 10 hz, v o = 20 v p-p, v s = 15 v 120 150 db gain bandwidth product gbwp a v = 1 20 khz power supply power supply rejection ratio psrr 3.2 10 v/v supply current (all amplifiers) i sy v s = 1.5 v, no load 40 60 a v s = 15 v, no load 60 80 a noise performance voltage noise e n p-p f o = 0.1 hz to 10 hz, v s = 15 v 3 v p-p voltage noise density e n f = 1 khz 60 nv/hz current noise density i n f = 1 khz 0.07 pa/hz 1 guaranteed by cmrr test. 2 guaranteed but not 100% tested.
OP490 rev. e | page 4 of 16 @ v s = 1.5 v to 15 v, ?40c t a +85c table 2. parameter symbol conditions min typ max unit input characteristics input offset voltage v os 0.8 1.5 mv average input offset voltage drift tcv os v s = 15 v 4 v/c input offset current i os v cm = 0 v 1.3 7 na input bias current i b v cm = 0 v 4.4 25 na large signal voltage gain a vo v s = 15 v, v o = 10 v r l = 100 k 300 600 v/mv r l = 10 k 150 250 v/mv r l = 2 k 75 125 v/mv v+ = 5 v, v? = 0 v, 1 v < v o < 4 v r l = 100 k 80 160 v/mv r l = 10 k 40 90 v/mv input voltage range 1 ivr v+ = 5 v, v? = 0 v 0.3 5 v ?15 +13.5 v common-mode rejection ratio cmrr v+ = 5 v, v? = 0 v, 0 v < v cm < 3.5 v 80 100 db v s = 15 v, ?15 v < v cm < +13.5 v 90 110 db output characteristics output voltage swing v o v s = 15 v 13 14 v r l = 2 k 10 11 v output voltage high v oh v+ = 5 v, v? = 0 v, r l = 2 k 3.9 4.1 v output voltage low v ol v+ = 5 v, v? = 0 v, r l = 10 k 100 500 v power supply power supply rejection ratio psrr 5.6 17.8 v/v supply current (all amplifiers) i sy v s = 1.5 v, no load 60 100 ma v s = 15 v, no load 75 120 ma 1 guaranteed by cmrr test. 00308-003 v? ? in v + output +in figure 3. simplified schematic
OP490 rev. e | page 5 of 16 absolute maximum ratings table 3. parameter rating supply voltage 18 v digital input voltage [(v?) ? 20 v] to [(v+) + 20 v] common-mode input voltage [(v?) ? 20 v] to [(v+) + 20 v] output short-circuit duration continuous storage temperature range ?65c to +150c operating temperature range ?40c to +85c junction temperature (t j ) range ?65c to +150c lead temperature (soldering, 60 sec) 300c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. thermal resistance ja is specified for worst-case mounting conditions, that is, ja is specified for a device in socket for the pdip package; ja is specified for a device soldered to a printed circuit board (pcb) for the soic package. table 4. package type ja jc unit 14-lead pdip_n (s-suffix) 76 33 c/w 16-lead soic_r (s-suffix) 92 27 c/w esd caution
OP490 rev. e | page 6 of 16 typical performance characteristics 00308-004 0.4 0.3 2 0.1 0.2 input offset voltage (ma) temperature (c) ?75 ?50 ?25 25 50 75 125 0 v s = 15v figure 4. input offset voltage vs. temperature 00308-005 1.6 1.4 0.2 0.6 0.4 1.2 1.0 0.8 input offset current (na) temperature (c) ?75 ?50 ?25 25 50 75 125 0 v s = 15v figure 5. input offset current vs. temperature 00308-006 4.8 4.6 3.6 3.8 4.4 4.2 4.0 input bias current (na) temperature (c) ?75 ?50 ?25 25 50 75 125 0 v s = 15v figure 6. input bias current vs. temperature 00308-007 90 80 30 40 70 60 50 total supply current (a) temperature (c) ?75 ?50 ?25 25 50 75 125 0 v s = 15v v s = 1.5v figure 7. total supply current vs. temperature 00308-008 600 500 0 100 400 300 200 open-loop gain (v/mv) single-supply voltage (v) 0 5 10 20 25 30 15 25c 85c 125c t a = 25c r l = 10k ? figure 8. open-loop gain vs. single-supply voltage 140 60 80 100 120 40 20 0 0.1 1 10 100 1k 10k 100k open-loop gain (db) frequency (hz) phase shift (degrees) 180 90 45 0 135 v s = 15v t a = 25c r l = 10k ? 00308-009 gain phase figure 9. open-loop gain and phase shift vs. frequency
OP490 rev. e | page 7 of 16 60 20 40 0 ?20 10 100 1k 10k 100k closed-loop gain (db) frequency (hz) v s = 15v t a = 25c 00308-010 figure 10. closed-loop gain vs. frequency 6 2 3 4 5 1 0 100 1k 10k 100k output voltage swing (v) load resistance ( ? ) v+ = 5v, v? = 0v t a = 25c 00308-011 figure 11. output voltage swing vs. load resistance 16 4 6 8 10 12 14 2 0 100 1k 10k 100k output swing (v) load resistance ( ? ) 00308-012 v s = 15v t a = 25c positive negative figure 12. output voltage swing vs. load resistance 40 60 80 100 120 20 1 10 100 1k power supply rejection (db) load resistance ( ? ) 00308-013 t a = 25c negative supply positive supply figure 13. power supply rejection vs. frequency 60 80 100 120 140 40 0.1 1 10 100 1k common-mode rejection (db) frequency (hz) 00308-014 v s = 15v t a = 25c figure 14. common-mode rejection vs. frequency 10 100 1k 1 0.1 1 10 100 1k voltage noise density (nv/ hz) frequency (hz) 00308-015 v s = 15v t a = 25c figure 15. voltage noise density vs. frequency
OP490 rev. e | page 8 of 16 1 10 100 0.1 0.1 1 10 100 1k current noise density (pa/ hz) frequency (hz) 00308-016 v s = 15v t a = 25c figure 16. current noise density vs. frequency 00308-017 voltage (20mv/div) time (100s/div) v s = 15v t a = 25c a v = 1 r l = 10k ? c l = 500pf figure 17. small signal transient response 00308-018 voltage (5v/div) time (1ms/div) v s = 15v t a = 25c a v = 1 r l = 10k ? c l = 500pf figure 18. large signal transient response
OP490 rev. e | page 9 of 16 applications information 00308-019 gnd +18 v 12345 67 14 13 12 11 10 9 8 ? 18 v ab dc figure 19. burn-in circuit v in +15 v ? 15v 00308-020 1/4 OP490 a + ? op37 a + ? +15v v2 v1 20v p-p @ 10hz 1k? 100? 10k ? 1/4 OP490 b + ? 1/4 OP490 c + ? 1/4 OP490 d + ? ? 15v channel separation = 20 log v1 v2/1000 figure 20. channel separation test circuit battery-powered applications the OP490 can be operated on a minimum supply voltage of 1.6 v or with dual supplies of 0.8 v drawing only 60 a of supply current. in many battery-powered circuits, the OP490 can be continuously operated for hundreds of hours before requiring battery replacement, thereby reducing equipment downtime and operating costs. high performance portable equipment and instruments frequently use lithium cells because of their long shelf life, light weight, and high energy density relative to older primary cells. most lithium cells have a nominal output voltage of 3 v and are noted for a flat discharge characteristic. the low supply current requirement of the OP490, combined with the flat discharge characteristic of the lithium cell, indicates that the OP490 can be operated over the entire useful life of the cell. figure 21 shows the typical discharge characteristic of a 1 ah lithium cell powering an OP490 with each amplifier, in turn, driving full output swing into a 100 k load. 00308-021 4 3 0 1 2 lithium-sulphur dioxide cell voltage (v) hours 0 250 500 1000 1250 1500 750 figure 21. lithium-sulphur dioxide cell discharge characteristic with OP490 and 100 k loads single-supply output voltage range in single-supply operation the input and output ranges of the OP490 include ground. this allows true zero-in, zero-out operation. the output stage provides an active pull-down to around 0.8 v above ground. below this level, a load resistance of up to 1 m to ground is required to pull the output down to zero. in the region from ground to 0.8 v, the OP490 has voltage gain equal to the data sheet specification. output current source capability is maintained over the entire voltage range including ground.
OP490 rev. e | page 10 of 16 input voltage protection the OP490 uses a pnp input stage with protection resistors in series with the inverting and noninverting inputs. the high breakdown of the pnp transistors coupled with the protection resistors provides a large amount of input protection, allowing the inputs to be taken 20 v beyond either supply without damaging the amplifier. micropower voltage-controlled oscillator an OP490 in combination with an inexpensive quad cmos switch comprise the precision v co of figure 22 . this circuit provides triangle and square wave outputs and draws only 75 a from a 5 v supply. a acts as an integrator; s1 switches the charging current symmetrically to yield positive and negative ramps. the integrator is bounded by b, which acts as a schmitt trigger with a precise hysteresis of 1.67 v, set by resistors r5, r6, and r7, and the associated cmos switches. the resulting output of a is a triangle wave with upper and lower levels of 3.33 v and 1.67 v. the output of b is a square wave with almost rail-to-rail swing. with the components shown, frequency of operation is given by the equation f out = v control (volts) 10 hz/v but this is easily changed by varying c1. the circuit operates well up to a few hundred hertz. v control 00308-022 + ? 1/4 OP490 a + ? 1/4 OP490 b square out in/out in/out in/out in/out cont cont cont cont v ss v dd out/in out/in out/in out/in c1 75nf triangle out r5 200k ? r6 200k ? +15v 7 6 5 r1 200k ? r2 200k ? +15v r4 200k ? 1 4 11 2 3 r3 100k ? s1 s2 s3 s4 r8 200k ? +5v +5v +5v r7 200k ? 11 4 21 3 31 2 41 1 51 0 69 78 figure 22. micropower voltage controlled oscillator
OP490 rev. e | page 11 of 16 micropower single-supply quad voltage- output 8-bit dac the circuit shown in figure 23 uses the dac8408 cmos quad 8-bit dac, and the OP490 to form a single-supply quad voltage output dac with a supply drain of only 140 a. the dac8408 is used in voltage switching mode and each dac has an output resistance (10 k) independent of the digital input code. the output amplifiers act as buffers to avoid loading the dacs. the 100 k resistors ensure that the OP490 outputs swing below 0.8 v when required. 00308-023 dgnd a/b 28 v ref a reference voltage 1.5v v ref b v ref c v ref d i out1d dac data bus pin 9 (lsb) to pin 16 (msb) dac a 1/4 dac8408 OP490 dac8408 dac b 1/4 dac8408 dac c 1/4 dac8408 dac d 1/4 dac8408 r4 100k ? v out d r3 100k ? v out c r2 100k ? v out b r1 100k ? v out a 1 4 11 7 14 8 +5 v 2 3 6 5 13 12 9 10 21 23 i out2c/2d 24 i out1c 25 i out1b 6 i out2a/2b 5 i out1a 4 27 8 2 19 18 digital control signals 20 17 ds2 ds1 r/w + ? 1/4 OP490 a + ? 1/4 OP490 b + ? 1/4 OP490 c + ? 1/4 OP490 d figure 23. micropower single-supply quad voltage output 8-bit dac
OP490 rev. e | page 12 of 16 00308-024 + ? 1/4 OP490 a + ? 1/4 OP490 b + ? 1/4 OP490 d + ? 1/4 OP490 c r4 50? r8 50? r l 7 6 5 1 4 11 2 3 13 12 9 8 10 14 r7 50? r6 5k ? r3 50? r2 9k? r5 5k? r1 1k? +15v ? 15v v in figure 24. high output amplifier high output amplifier the amplifier shown in figure 24 is capable of driving 25 v p-p into a 1 k load. design of the amplifier is based on a bridge configuration. a amplifies the input signal and drives the load with the help of b. amplifier c is a unity-gain inverter which drives the load with help from d. gain of the high output amplifier with the component values shown is 10, but can easily be changed by varying r1 or r2. single-supply micropower quad programmable gain amplifier the combination of a quad OP490 and the dac8408 quad 8-bit cmos dac creates a quad programmable-gain amplifier with a quiescent supply drain of only 140 a. the digital code present at the dac, which is easily set by a microprocessor, determines the ratio between the fixed dac feedback resistor and the resistance of the dac ladder seen by the op amp feed- back loop. the gain of each amplifier is: nv v in out 256 ?= where n equals the decimal equivalent of the 8-bit digital code present at the dac. if the digital code present at the dac consists of all zeros, the feedback loop opens causing the op amp output to saturate. the 10 m resistors placed in parallel with the dac feedback loop eliminate this problem with a very small reduction in gain accuracy. the 2.5 v reference biases the amplifiers to the center of the linear region providing maximum output swing.
OP490 rev. e | page 13 of 16 00308-025 dgnd a/b 28 i out1d dac data bus pin 9 (lsb) to pin 16 (msb) OP490 dac8408 dac d 1/4 dac8408 dac c 1/4 dac8408 dac b 1/4 dac8408 dac a 1/4 dac8408 v out d 1 4 11 14 +5v 2 3 13 12 10 9 7 5 6 23 i out2c/2d 24 i out2a/2b 5 i out1b 6 v ref d 21 19 18 digital control signals 20 17 ds2 ds1 r/w +2.5v reference voltage 22 r fb d v in d c4 0.1f 25 r fb c v in c c3 0.1f 7 r fb b v in b c2 0.1f 3 r fb a v in a c1 0.1f r4 10m ? v out c 8 i out1c 25 v ref c 27 v ref b 8 r3 10m ? v out a i out1a 4 v ref a 2 v dd 1 r1 10m ? v out b r2 10m ? + ? 1/4 OP490 b + ? 1/4 OP490 a + ? 1/4 OP490 c + ? 1/4 OP490 d figure 25. single-supply micropower quad programmable gain amplifier
OP490 rev. e | page 14 of 16 outline dimensions compliant to jedec standards ms-001 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. corner leads may be configured as whole or half leads. 070606-a 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 0.070 (1.78) 0.050 (1.27) 0.045 (1.14) 14 1 7 8 0.100 (2.54) bsc 0.775 (19.69) 0.750 (19.05) 0.735 (18.67) 0.060 (1.52) max 0.430 (10.92) max 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.015 (0.38) gauge plane 0.210 (5.33) max seating plane 0.015 (0.38) min 0.005 (0.13) min 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) figure 26. 14-lead plastic dual in-line package [pdip] narrow body p-suffix (n-14) dimensions shown in inches and (millimeters) 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-013- aa 032707-b 10.50 (0.4134) 10.10 (0.3976) 0.30 (0.0118) 0.10 (0.0039) 2.65 (0.1043) 2.35 (0.0925) 10.65 (0.4193) 10.00 (0.3937) 7.60 (0.2992) 7.40 (0.2913) 0 . 7 5 ( 0 . 0 2 9 5 ) 0 . 2 5 ( 0 . 0 0 9 8 ) 45 1.27 (0.0500) 0.40 (0.0157) c oplanarity 0.10 0.33 (0.0130) 0.20 (0.0079) 0.51 (0.0201) 0.31 (0.0122) seating plane 8 0 16 9 8 1 1.27 (0.0500) bsc figure 27. 16-lead standard small outline package [soic_w] wide body s-suffix (rw-16) dimensions shown in millimeters and (inches)
OP490 rev. e | page 15 of 16 ordering guide model 1 temperature range package description package option OP490gp ?40c to +85c 14-lead pdip_n n-14 (p-suffix) OP490gpz ?40c to +85c 14-lead pdip_n n-14 (p-suffix) OP490gs ?40c to +85c 16-lead soic_w rw-16 (s-suffix) OP490gsz ?40c to +85c 16-lead soic_w rw-16 (s-suffix) OP490gsz-reel ?40c to +85c 16-lead soic_w rw-16 (s-suffix) 1 z = rohs compliant part.
OP490 rev. e | page 16 of 16 notes ?1987C2010 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d00308-0-5/10(e)

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