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16 v, 1 mhz, cmos rail-to-rail input/output operational amplifier ada4665-2 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 ?2009 analog devices, inc. all rights reserved. ada4665-2 top view (not to scale) features lower power at high voltage: 290 a per amplifier typical low input bias current: 1 pa maximum wide bandwidth: 1.2 mhz typical slew rate: 1 v/s typical offset voltage drift: 3 v/c typical single-supply operation: 5 v to 16 v dual-supply operation: 2.5 v to 8 v unity gain stable applications portable systems high density power budget systems medical equipment physiological measurement precision references multipole filters sensors transimpedance amplifiers buffer/level shifting pin configurations out a 1 ?in a 2 +in a 3 v? 4 v+ 8 out b 7 ?in b 6 +in b 5 07650-001 ada4665-2 top view (not to scale) figure 1. 8-lead soic out a 1 ?in a 2 +in a 3 v? 4 v+ 8 out b 7 ?in b 6 07650-002 +in b 5 figure 2. 8-lead msop general description the ada4665-2 is a rail-to-rail input/output dual amplifier optimized for lower power budget designs. the ada4665-2 offers a low supply current of 400 a maximum per amplifier at 25c and 600 a maximum per amplifier over the extended industrial temperature range. this feature makes the ada4665-2 well suited for low power applications. in addition, the ada4665-2 has a very low bias current of 1 pa maximum, low offset voltage drift of 3 v/c, and bandwidth of 1.2 mhz. the combination of these features, together with a wide supply voltage range from 5 v to 16 v, allows the device to be used in a wide variety of other applications, including process control, instrumentation equipment, buffering, and sensor front ends. furthermore, its rail-to-rail input and output swing adds to its versatility. the ada4665-2 is specified from ?40c to +125c and is available in standard soic and msop packages. table 1. low cost rail-to-rail input/output op amps supply 5 v 16 v single ad8541 dual ad8542 ada4665-2 quad ad8544 table 2. other rail-to-rail input/output op amps supply 5 v 16 v 36 v single ad8603 ad8663 dual ad8607 ad8667 ada4091-2 quad ad8609 ad8669
ada4665-2 rev. 0 | page 2 of 2 0 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? pin configurations ........................................................................... 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? electrical characteristics16 v operation ............................. 3 ? electrical characteristics5 v operation................................ 4 ? absolute maximum ratings ............................................................ 5 ? thermal resistance .......................................................................5 ? esd caution...................................................................................5 ? typical performance characteristics ..............................................6 ? applications information .............................................................. 15 ? rail-to-rail input operation .................................................... 15 ? current shunt sensor ................................................................ 15 ? active filters ............................................................................... 15 ? outline dimensions ....................................................................... 17 ? ordering guide .......................................................................... 17 ? revision history 1/09revision 0: initial version
ada4665-2 rev. 0 | page 3 of 20 specifications electrical characteristics16 v operation v sy = 16 v, v cm = v sy /2, t a = 25c, unless otherwise noted. table 3. parameter symbol test conditions/comments min typ max unit input characteristics offset voltage v os v cm = 16 v 1 4 mv v cm = 0 v to 16 v 1 6 mv ?40c t a +125c 9 mv offset voltage drift ?v os /?t ?40c t a +125c 3 v/c input bias current i b 0.1 1 pa ?40c t a +125c 200 pa input offset current i os 0.1 1 pa ?40c t a +125c 40 pa input voltage range ?40c t a +125c 0 16 v common-mode rejection ratio cmrr v cm = 0 v to 16 v 55 75 db ?40c t a +125c 50 db large signal voltage gain a vo r l = 10 k, v o = 0.5 v to 15 v 85 100 db ?40c t a +125c 75 db input resistance r in 4 g input capacitance, differential mode c indm 2 pf input capacitance, common mode c incm 7 pf output characteristics output voltage high v oh r l = 100 k to v cm 15.95 15.99 v ?40c t a +125c 15.9 v r l = 10 k to v cm 15.9 15.95 v ?40c t a +125c 15.8 v output voltage low v ol r l = 100 k to v cm 4 7.5 mv ?40c t a +125c 15 mv r l = 10 k to v cm 40 75 mv ?40c t a +125c 150 mv short-circuit current i sc 30 ma closed-loop output impedance z out f = 100 khz, a v = 1 100 power supply power supply rejection ratio psrr v sy = 5 v to 16 v 70 95 db ?40c t a +125c 65 db supply current per amplifier i sy i o = 0 ma 290 400 a ?40c t a +125c 600 a dynamic performance slew rate sr r l = 10 k, c l = 50 pf, a v = 1 1 v/s settling time to 0.1% t s v in = 1 v step, r l = 2 k, c l = 50 pf 6.5 s gain bandwidth product gbp r l = 10 k, c l = 50 pf, a v = 1 1.2 mhz phase margin m r l = 10 k, c l = 50 pf, a v = 1 50 degrees noise performance voltage noise e n p-p f = 0.1 hz to 10 hz 3 v p-p voltage noise density e n f = 1 khz 32 nv/hz f = 10 khz 27 nv/hz current noise density i n f = 1 khz 50 fa/hz
ada4665-2 rev. 0 | page 4 of 20 electrical characteristics5 v operation v sy = 5 v, v cm = v sy /2, t a = 25c, unless otherwise noted. table 4. parameter symbol test conditions/comments min typ max unit input characteristics offset voltage v os v cm = 5 v 1 4 mv v cm = 0 v to 5 v 1 6 mv ?40c t a +125c 9 mv offset voltage drift ?v os /?t ?40c t a +125c 3 v/c input bias current i b 0.1 1 pa ?40c t a +125c 100 pa input offset current i os 0.1 1 pa ?40c t a +125c 10 pa input voltage range ?40c t a +125c 0 5 v common-mode rejection ratio cmrr v cm = 0 v to 5 v 55 75 db ?40c t a +125c 50 db large signal voltage gain a vo r l = 10 k, v o = 0.5 v to 4.5 v 85 100 db ?40c t a +125c 75 db input resistance r in 1 g input capacitance, differential mode c indm 2 pf input capacitance, common mode c incm 7 pf output characteristics output voltage high v oh r l = 100 k to v cm 4.95 4.99 v ?40c t a +125c 4.9 v r l = 10 k to v cm 4.9 4.96 v ?40c t a +125c 4.8 v output voltage low v ol r l = 100 k to v cm 3 5 mv ?40c t a +125c 10 mv r l = 10 k to v cm 30 50 mv ?40c t a +125c 100 mv short-circuit current i sc 8 ma closed-loop output impedance z out f = 100 khz, a v = 1 100 power supply power supply rejection ratio psrr v sy = 5 v to 16 v 70 95 db ?40c t a +125c 65 db supply current per amplifier i sy i o = 0 ma 270 350 a ?40c t a +125c 600 a dynamic performance slew rate sr r l = 10 k, c l = 50 pf, a v = 1 1 v/s settling time to 0.1% t s v in = 1 v step, r l = 2 k, c l = 50 pf 6.5 s gain bandwidth product gbp r l = 10 k, c l = 50 pf, a v = 1 1.2 mhz phase margin m r l = 10 k, c l = 50 pf, a v = 1 50 degrees noise performance voltage noise e n p-p f = 0.1 hz to 10 hz 3 v p-p voltage noise density e n f = 1 khz 32 nv/hz f = 10 khz 27 nv/hz current noise density i n f = 1 khz 50 fa/hz
ada4665-2 rev. 0 | page 5 of 20 absolute maximum ratings thermal resistance table 5. parameter rating supply voltage 16.5 v input voltage 1 gnd ? 0.3 v to v sy + 0.3 v input current 10 ma differential input voltage v sy output short-circuit duration to gnd indefinite storage temperature range ?65c to +150c operating temperature range ?40c to +125c junction temperature range ?65c to +150c lead temperature (soldering, 60 sec) 300c ja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. this value was measured using a 4-layer jedec standard printed circuit board. table 6. thermal resistance package type ja jc unit 8-lead soic_n (r-8) 158 43 c/w 8-lead msop (rm-8) 186 52 c/w esd caution 1 the input pins have clamp di odes to the power supply pins. 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.
ada4665-2 rev. 0 | page 6 of 20 typical performance characteristics t a = 25c, unless otherwise noted. 70 60 50 40 30 20 10 number of amplifiers 70 60 50 40 30 20 10 0 ?6 ?5 ?4 ?3 ?2 ?1 0123456 v os (mv) number of amplifiers 07650-003 0 ?6 ?5 ?4 ?3 ?2 ?1 0123456 v os (mv) 07650-006 v sy = 5v v cm = v sy /2 figure 3. input offset voltage distribution 10 9 8 7 6 5 4 3 2 1 number of amplifiers v sy = 16v v cm = v sy /2 figure 6. input offset voltage distribution 10 9 8 7 6 5 4 3 2 1 0 012345678910 tcv os (v/c) number of amplifiers 07650-004 0 012345678910 tcv os (v/c) 07650-007 v sy = 5v ?40c t a +125c figure 4. input offset voltage drift distribution 5 4 3 2 1 0 ?1 ?2 ?3 v os (mv) v sy = 16v ?40c t a +125c 5 4 3 2 1 0 ?1 ?2 ?3 ?4 0 2 4 6 8 10 12 14 16 v os (mv) 0-005 figure 7. input offset voltage drift distribution v cm (v) 0765 ?4 01 2 34 5 v cm (v) 07650-008 v sy = 5v figure 5. input offset voltage vs. common-mode voltage v sy = 16v figure 8. input offset voltage vs. common-mode voltage
ada4665-2 rev. 0 | page 7 of 20 1k 100 10 1 0.1 0.01 0.001 25 50 75 100 125 temperature (c) i b (pa) 07650-012 t a = 25c, unless otherwise noted. 1k 100 10 1 0.1 0.01 0.001 25 50 75 100 125 temperature (c) i b (pa) 07650-009 i b + i b ? v sy = 5v i b + i b ? v sy = 16v 1k 100 10 1 0.1 0.01 0.001 0.0001 0 2 4 6 8 10 12 14 16 v cm (v) i b (pa) 07650-010 figure 9. input bias current vs. temperature 1k 100 10 1 0.1 0.01 0.001 i b (pa) figure 12. input bias current vs. temperature 0.0001 0 12345 v cm (v) 07650-013 v sy = 5v 85c 125c 105c 25c figure 10. input bias current vs. input common-mode voltage 10k 1k 100 10 1 output voltage (v oh ) to supply rail (mv) v sy = 16v 125c 105c 85c 25c figure 13. input bias current vs. input common-mode voltage 10k 1k 100 10 1 0.1 0.01 0.001 0.01 0.1 1 10 100 output voltage (v oh ) to supply rail (mv) 0-011 load current (ma) 0765 0.1 0.001 0.01 0.1 1 10 100 load current (ma) 07650-014 ?40c +25c +85c +125c v sy = 5v figure 11. output voltage (v oh ) to supply rail vs. load current v sy = 16v ?40c +25c +85c +125c figure 14. output voltage (v oh ) to supply rail vs. load current
ada4665-2 rev. 0 | page 8 of 20 0.1 0.001 0.01 0.1 1 10 100 load current (ma) 07650-018 t a = 25c, unless otherwise noted. 10k 1k 100 10 1 output voltage (v ol ) to supply rail (mv) v sy = 5v ?40c +25c +85c +125c figure 15. output voltage (v ol ) to supply rail vs. load current 5.00 4.99 4.98 4.97 4.96 4.95 4.94 4.93 output voltage, v oh (v) 10k 1k 100 10 1 0.1 0.001 0.01 0.1 1 10 100 load current (ma) output voltage (v ol ) to supply rail (mv) 07650-015 v sy = 16v ?40c +25c +85c +125c figure 18. output voltage (v ol ) to supply rail vs. load current 4.92 ?50 ?25 0 25 50 75 100 125 temperature (c) 07650-019 v sy = 5v r l = 100k ? r l = 10k ? figure 16. output voltage (v oh ) vs. temperature 10 16.00 15.99 15.98 15.97 15.96 15.95 15.94 15.93 15.92 15.91 15.90 ?50 ?25 0 25 50 75 100 125 temperature (c) output voltage, v oh (v) 07650-016 r l = 100k ? r l = 10k ? v sy = 16v figure 19. output voltage (v oh ) vs. temperature 0 ?50 ?25 0 25 50 75 100 125 temperature (c) 07650-020 60 50 40 30 20 output voltage, v ol (mv) r l = 100k ? v sy = 5v r l = 10k ? figure 17. output voltage (v ol ) vs. temperature 60 50 40 30 20 10 0 ?50 ?25 0 25 50 75 100 125 output voltage, v ol (mv) 0-017 v sy = 16v temperature (c) 0765 r l = 100k ? r l = 10k ? figure 20. output voltage (v ol ) vs. temperature
ada4665-2 rev. 0 | page 9 of 20 80 60 40 20 0 ?20 ?40 180 135 90 45 0 ?45 ?90 1k 10k 100k 1m 10m frequency (hz) open-loop gain (db) phase (degrees) 07650-024 t a = 25c, unless otherwise noted. 80 60 40 20 0 ?20 ?40 180 135 90 45 0 ?45 ?90 1k 10k 100k 1m 10m frequency (hz) open-loop gain (db) phase (degrees) 07650-021 gain phase v sy = 5v r l = 10k ? c l = 50pf v sy = 16v r l = 10k ? c l = 50pf phase gain figure 21. open-loop gain and phase vs. frequency 50 40 30 20 10 0 ?10 ?20 ?30 ?40 closed-loop gain (db) figure 24. open-loop gain and phase vs. frequency 50 40 30 20 10 0 ?10 ?20 ?30 ?40 ?50 100 1k 10k 100k 1m 10m 100m frequency (hz) closed-loop gain (db) 07650-022 ?50 100 1k 10k 100k 1m 10m 100m frequency (hz) 07650-025 v sy = 5v r l = 10k ? a v = 100 a v = 10 a v = 1 figure 22. closed-loop gain vs. frequency 1k 100 10 1 0.1 z out ( ? ) v sy = 16v r l = 10k ? a v = 100 a v = 10 a v = 1 figure 25. closed-loop gain vs. frequency 1k 100 10 1 0.1 0.01 10 100 1k 10k 100k 1m 10m z out ( ? ) 0-023 frequency (hz) 0765 0.01 10 100 1k 10k 100k 1m 10m frequency (hz) 07650-026 v sy = 5v a v = 100 a v = 10 a v = 1 figure 23. output im pedance vs. frequency v sy = 16v a v = 100 a v = 10 a v = 1 figure 26. output im pedance vs. frequency
ada4665-2 rev. 0 | page 10 of 20 t a = 25c, unless otherwise noted. 100 90 80 70 60 50 cmrr (db) 40 100 1k 10k 100k 1m frequency (hz) 07650-030 v sy = 5v figure 27. cmrr vs. frequency 120 100 80 60 40 20 0 psrr (db) 100 90 80 70 60 50 40 100 1k 10k 100k 1m frequency (hz) cmrr (db) 07650-027 v sy = 16v figure 30. cmrr vs. frequency 120 100 80 60 40 20 0 ?20 100 1k 10k 100k 1m 10m frequency (hz) psrr (db) 07650-028 ?20 100 1k 10k 100k 10m 1m frequency (hz) 07650-031 v sy = 5v psrr+ psrr? figure 28. psrr vs. frequency 80 70 60 50 40 30 20 10 overshoot (%) v sy = 16v psrr+ psrr? figure 31. psrr vs. frequency 0 10 100 1k capacitance (pf) 07650-032 v sy = 5v v in = 100mv p-p r l = 10k ? os+ os? figure 29. small signal overshoot vs. load capacitance 80 70 60 50 40 30 20 10 0 10 100 1k overshoot (%) 0-029 v sy = 16v v in = 100mv p-p r l = 10k ? os+ os? capacitance (pf) 0765 figure 32. small signal overshoot vs. load capacitance
ada4665-2 rev. 0 | page 11 of 20 07650-036 t a = 25c, unless otherwise noted. v sy = 5v r l = 2k ? c l = 10pf voltage (1v/div) time (100s/div) v sy = 16v r l = 2k ? c l = 10pf voltage (5v/div) time (100s/div) 07650-033 figure 33. large signal transient response figure 36. large signal transient response 07650-037 v sy = 5v r l = 2k ? c l = 10pf voltage (50mv/div) v sy = 16v r l = 2k ? c l = 10pf voltage (50mv/div) time (100s/div) time (100s/div) figure 34. small signal transient response 07650-034 figure 37. small signal transient response 07650-038 v sy = 2.5v input voltage (mv) utput voltage (v) 50 0 ?50 ?100 2 3 1 0 o time (20s/div) ?1 input output figure 35. positive overload recovery 07650-035 v sy = 8v input voltage (mv output voltage (v) 50 0 ?50 ?100 10 5 0 ?5 ) input output time (20s/div) figure 38. positive overload recovery
ada4665-2 rev. 0 | page 12 of 07650-042 20 t a = 25c, unless otherwise noted. v sy = 2.5v input voltage (mv ) ou time (20s/div) ?3 tput voltage (v) 150 100 50 0 0 ?1 ?2 input output figure 39. negative overload recovery 07650-043 voltage (500mv/div) +5mv ?5mv 0 time (2s/div) input output v sy = 5v r l = 2k ? c l = 50pf error band figure 40. negative settling time to 0.1% 07650-044 voltage (500mv/div) +5mv ?5mv 0 time (2s/div) input output v sy = 5v r l = 2k ? c l = 50pf error band figure 41. positive settling time to 0.1% 07650-039 v sy = 8v input voltage (mv output voltage (v) time (20s/div) 150 100 50 0 0 ?5 ?10 ) input output 07650-040 figure 42. negative overload recovery voltage (500mv/div) time (2s/div) +5mv ?5mv 0 input output v sy = 16v r l = 2k ? c l = 50pf error band 0-041 figure 43. negative settling time to 0.1% 0765 input voltage (500mv/div) +5mv ?5mv 0 time (2s/div) output error band v sy = 16v r l = 2k ? c l = 50pf figure 44. positive settling time to 0.1%
ada4665-2 rev. 0 | page 13 of 100 10 100 1k 10k 100k frequency (hz) voltage noise density (nv/ 20 t a = 25c, unless otherwise noted. hz) 07650-048 v sy = 5v 100 10 100 1k 10k 100k frequency (hz) voltage noise density (nv/ figure 45. voltage noise density vs. frequency 07650-049 input voltage noise (1v/div) time (2s/div) v sy = 5v figure 46. 0.1 hz to 10 hz noise 900 800 700 600 500 400 300 200 100 supply current (a) 0 0 2 4 6 8 10 12 14 16 supply voltage (v) 07650-047 +85c +25c ?40c +125c figure 47. supply current vs. supply voltage hz) 07650-045 v sy = 16v figure 48. voltage noise density vs. frequency v sy = 16v 07650-046 input vol t age noise (1v/div) time (2s/div) figure 49. 0.1 hz to 10 hz noise 900 800 700 600 500 400 300 ?50 ?25 0 25 50 75 100 125 supply current (a) 0-050 temperature (c) 0765 v sy = 16v v sy = 5v figure 50. supply current vs. temperature
ada4665-2 rev. 0 | page 14 of ?160 100 1k 10k 100k frequency (hz) 07650-053 20 t a = 25c, unless otherwise noted. 0 ?140 ?120 ?100 ?80 ?60 ?40 ?20 channel separation (db) v sy = 5v r l = 10k ? a v = ?100 1k? 100k ? v in = 1v p-p v in = 4v p-p figure 51. channel separation vs. frequency 1 0.1 0.01 thd + noise (%) 0 ?160 ?140 ?120 ?100 ?80 ?60 ?40 ?20 100 1k 10k 100k frequency (hz) channel separation (db) 07650-051 v sy = 16v r l = 10k ? a v = ?100 1k ? 100k ? v in = 1v p-p v in = 5v p-p v in = 15v p-p figure 53. channel separation vs. frequency 1 0.1 0.01 0.001 10 100 1k 10k 100k thd + noise (%) 0-052 frequency (hz) 0765 0.001 10 100 1k 10k 100k frequency (hz) 07650-054 v sy = 5v r l = 10k ? a v = 1 v in = 1v p-p v in = 4v p-p figure 52. thd + noise vs. frequency v sy = 16v r l = 10k ? a v = 1 v in = 1v p-p v in = 5v p-p v in = 15v p-p figure 54. thd + noise vs. frequency
ada4665-2 rev. 0 | page 15 of 20 applications information rail-to-rail input operation the ada4665-2 is a unity-gain stable cmos operational amplifier designed with rail-to-rail input/output swing capability to optimize performance. the rail-to-rail input feature is vital to maintain the wide dynamic input voltage range and to maximize signal sw ing to both supply rails. for example, the rail-to-rail input feature is extremely useful in buffer applications where the input voltage must cover both the supply rails. the input stage has two input differential pairs, nmos and pmos. when the input common-mode voltage is at the low end of the input voltage range, the pmos input differential pair is active and amplifies the input signal. as the input common- mode voltage is slowly increased, the pmos differential pair gradually turns off while the nmos input differential pair turns on. this transition is inherent to all rail-to-rail input amplifiers that use the dual differential pairs topology. for the ada4665-2, this transition occurs approximately 1 v away from the positive rail and results in a change in offset voltage due to the different offset voltages of the differential pairs (see figure 5 and figure 8 ). current shunt sensor many applications require the sensing of signals near the positive or the negative rails. current shunt sensors are one such application and are mostly used for feedback control systems. they are also used in a variety of other applications, including power metering, battery fuel gauging, and feedback controls in electrical power steering. in such applications, it is desirable to use a shunt with very low resistance to minimize the series voltage drop. this not only minimizes wasted power, but also allows the measurement of high currents while saving power. the ada4665-2 provides a low cost solution for implementing current shunt sensors. figure 55 shows a low-side current sensing circuit, and figure 56 shows a high-side current sensing circuit using the ada4665-2. a typical shunt resistor of 0.1 is used. in these circuits, the difference amplifier amplifies the voltage drop across the shunt resistor by a factor of 100. for true difference amplification, matching of the resistor ratio is very important, where r1/r2 = r3/r4. the rail-to-rail feature of the ada4665-2 allows the output of the op amp to almost reach 16 v (the power supply of the op amp). this allows the current shunt sensor to sense up to approximately 1.6 a of current. 1/2 ada4665-2 16v r l r2 1m ? r1 10k ? r s 0.1 ? r4 1m ? r3 10k ? v out * *v out = amplifier gain voltage across r s = 100 r s i = 10 i i 16v supply i 07650-055 figure 55. low-side current sensing circuit 1/2 ada4665-2 16v r l r4 1m ? r3 10k? r s 0.1 ? r2 1m ? r1 10k? i 16v supply i v out * *v out = amplifier gain voltage across r s = 100 r s i = 10 i 07650-056 figure 56. high-side current sensing circuit active filters the ada4665-2 is well suited for active filter designs. an active filter requires an op amp with a unity-gain bandwidth at least 100 times greater than the product of the corner frequency, f c , and the quality factor, q. an example of an active filter is the sallen-key, one of the most widely used filter topologies. this topology gives the user the flexibility of implementing either a low-pass or a high-pass filter by simply interchanging the resistors and capacitors. to achieve the desired performance, 1% or better component tolerances are usually required. figure 57 shows a two-pole low-pass filter. it is configured as a unity-gain filter with cutoff frequency at 10 khz. resistor and capacitor values are chosen to give a quality factor, q, of 1/2 for a butterworth filter, which has maximally flat pass-band frequency response. figure 58 shows the frequency response of the low-pass sallen-key filter. the response falls off at a rate of 40 db per decade after the cutoff frequency of 10 khz.
ada4665-2 rev. 0 | page 16 of 20 ada4665-2 07650-057 1/2 +v sy ?v sy r1 22.5k ? r2 22.5k ? c1 1nf c2 0.5nf v out v in figure 57. two-pole low-pass filter when r1 = r2 and c1 = 2c2, the values of q and the cutoff frequency are calculated as follows: )( r2r1c2 + c2c1r2r1 q = 2 r1 r2 c1 c f c = 2 1 10 0 ?10 ?20 ?30 ?40 ?50 ?60 100 1k 10k 100k 1m frequency (hz) gain (db) 07650-058 figure 58. low-pass filter: gain vs. frequency figure 59 shows a two-pole high-pass filter, with cutoff frequency at 10 khz and quality factor, q, of 1/2. ada4665-2 07650-059 1/2 +v sy ?v sy r1 22.5k ? r2 45k? c1 0.5nf c2 0.5nf v out v in figure 59. two-pole high-pass filter when r2 = 2r1 and c1 = c2, the values of q and the cutoff frequency are calculated as follows: )( c2c1r1 c2c1r2r1 q + = c2c1r2r1 f c = 2 1 0 ?10 10 ?20 ?30 ?40 ?50 ?60 ?70 ?80 ?90 ?100 ?110 ?120 gain (db) 07650-060 10 100 1k 10k 100k 1m frequency (hz) figure 60. high-pass filter: gain vs. frequency
ada4665-2 rev. 0 | page 17 of 20 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 outline dimensions 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 61. 8-lead standard small outline package [soic_n] narrow body (r-8) dimensions shown in millimeters and (inches) 0.80 0.60 0.40 8 0 4 8 1 5 pin 1 0.65 bsc seating plane 0.38 0.22 1.10 max 3.20 3.00 2.80 compliant to jedec standards mo-187-aa coplanarity 0.10 0.23 0.08 3.20 3.00 2.80 5.15 4.90 4.65 0.15 0.00 0 .95 0 .85 0 .75 figure 62. 8-lead mini small outline package [msop] (rm-8) dimensions shown in millimeters ordering guide model temperature range package desc ription package option branding ADA4665-2ARZ 1 ?40c to +125c 8-lead soic_n r-8 ADA4665-2ARZ-rl 1 ?40c to +125c 8-lead soic_n r-8 ADA4665-2ARZ-r7 1 ?40c to +125c 8-lead soic_n r-8 ada4665-2armz 1 ?40c to +125c 8-lead msop rm-8 a26 ada4665-2armz-r7 1 ?40c to +125c 8-lead msop rm-8 a26 ada4665-2armz-rl 1 ?40c to +125c 8-lead msop rm-8 a26 1 z = rohs compliant part.
ada4665-2 rev. 0 | page 18 of 20 notes
ada4665-2 rev. 0 | page 19 of 20 notes
ada4665-2 rev. 0 | page 20 of 20 notes ?2009 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d07650-0-1/09(0)

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