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1 ultra low noise, precision voltage reference isl21090 the isl21090 is a ultra low noise, high dc accuracy precision voltage reference with wide input voltage range. the isl21090 uses the new intersil advanced bipolar technology to achieve sub 1.0v p-p (1.25v option) 0.1hz to10hz noise with an initial voltage accuracy of 0.02% (2.5v option). the isl21090 offers 1.25v, 2.5v, and 5.0v output voltage options with 7ppm/c temperature coefficient and also provides excellent line and load regulation. these devices are offered in an 8 ld soic package. the isl21090 is ideal for high -end instrumentation, data acquisition and processing appl ications requiring high dc precision where low noise performance is critical. applications ?high-end instrumentation ? precision voltage sources for data acquisition system, industrial control, comm unication infrastructure ? process control and instrumentations ? active source for sensors features ? reference output voltage option - 1.25v, 2.5v, and 5.0v (released) - 7.5v (coming soon) ? initial accuracy: - isl21090-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.03% - isl21090-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.02% - isl21090-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.025% ? output voltage noise (0.1hz to 10hz) . . . . . . . . . . . . 1.0v p-p typ (1.25v option) ? supply current . . . . . . . . . . . . . . . . . . . .750a (1.25v option) ? temperature coefficient . . . . . . . . . . . . . . . . . . 7ppm/c max ? output current capability . . . . . . . . . . . . . . . . . . . . . . . . 20ma ? line regulation . . . . . . . . . . . . . . . . . 6ppm/v (1.25v option) ? load regulation . . . . . . . . . . . . . . 2.5ppm/ma (1.25v option) ? operating temperature range. . . . . . . . . . .-40c to +125c related literature see an1764 , ?isl21090xxev1z user?s guide? figure 1. isl21090 typical application diagram figure 2. v out vs temperature (2.5v option) 10f 0.1f chip select serial clock serial data i/o vdd vref sclk sdio csb outxs gnd dacoutx vin vref 0.1f outxf dac 1 2 3 4 dnc gnd vout trim 6 8 7 5 dnc dnc comp vin 2 . 4 9 8 0 2 . 4 9 8 5 2 . 4 9 9 0 2 . 5 0 0 0 2 . 5 0 0 5 2 . 5 0 1 0 -55 -35 -15 5 25 45 65 85 105 125 145 temperature (c) typical temperature v out (v) coefficient curve for 10 units 2 . 4 9 9 5 caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | copyright intersil americas inc. 2011, 2012. all rights reserved intersil (and design) is a trademark owned by intersil corporation or one of its subsidiaries. all other trademarks mentioned are the property of their respective owners. november 21, 2012 fn6993.3
isl21090 2 fn6993.3 november 21, 2012 pin configuration isl21090 (8 ld soic) top view 1 2 3 4 dnc gnd vout trim 6 8 7 5 dnc dnc comp vin pin descriptions pin number pin name description 1, 7, 8 dnc do not connect 2 vin input voltage connection 3 comp compensation and noise reduction capacitor 4 gnd ground connection 5 trim voltage reference trim input 6 vout voltage reference output ordering information part number (notes 1, 2, 3) part marking v out option (v) grade (%) tempco (ppm/c) temp range (c) package tape & reel (pb-free) pkg. dwg. # isl21090bfb812z-tk 21090 bfz12 1.25 0.03 7 -40 to +125 8 ld soic m8.15e isl21090bfb825z-tk 21090 bfz25 2.5 0.02 7 -40 to +125 8 ld soic m8.15e isl21090bfb850z-tk 21090 bfz50 5.0 0.02 7 -40 to +125 8 ld soic m8.15e coming soon isl21090bfb875z-tk 21090 bfz75 7.5 0.02 7 -40 to +125 8 ld soic m8.15e notes: 1. please refer to tb347 for details on reel specifications. 2. these intersil pb-free plastic packaged products employ spec ial pb-free material sets, molding compounds/die attach materials , and 100% matte tin plate plus anneal (e3 termination finish , which is rohs compliant and compatible wi th both snpb and pb-free soldering opera tions). intersil pb-free products are msl classified at pb-fr ee peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jed ec j std-020. 3. for moisture sensitivity level (msl), please see device information page for isl21090b12, isl21090b25, isl21090b50 . for more information on msl please see tech brief tb363 .
isl21090 3 fn6993.3 november 21, 2012 absolute maximum rating s thermal information max voltage v in to gnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5v to +40v v out to gnd (10s). . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5v to v out + 0.5v voltage on any pin to ground . . . . . . . . . . . . . . . . . . . -0.5v to +v out + 0.5v voltage on dnc pins . . . . . . . . . . . . . . . no connections permitted to these pins input voltage slew rate (max) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1v/s esd ratings human body model (tested per jesd22-a114f) . . . . . . . . . . . . . . . . 3kv machine model (tested per jesd22-a115-c) . . . . . . . . . . . . . . . . . . 200v charged device model (tested per jesd22-c110d) . . . . . . . . . . . . . 2kv latch-up (tested per jesd-78b; class 2, level a) . . . . . . . . . . . . . . . at +125c thermal resistance (typical) ja (c/w) jc (c/w) 8 ld soic package (notes 4, 5) . . . . . . . . . 110 60 continuous power dissipation (t a = +125c) . . . . . . . . . . . . . . . . .217mw maximum junction temperature (t jmax ). . . . . . . . . . . . . . . . . . . . . .+150c storage temperature range. . . . . . . . . . . . . . . . . . . . . . . .-65c to +150c recommended operating conditions temperature range (industrial) . . . . . . . . . . . . . . . . . . . . .-40c to +125c caution: do not operate at or near the maximum ratings listed for extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. notes: 4. ja is measured with the component mounted on a high effective thermal conductivity test board in free air. see tech brief tb379 for details. 5. for jc , the ?case temp? location is taken at the package top center. 6. post-reflow drift for the isl21090 devices can exceed 100v to 1.0mv based on experimental results with devices on fr4 double sided boards. the system engineer must take this into account when considering the reference voltage after assembly. electrical specifications v in = 5v (1.25v option), i out = 0, c l = 0.1f and cc = 0.01f, unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. parameter description conditions min (note 7) typ max (note 7) unit v out output voltage v in = 5v, 1.25 v v oa v out accuracy @ t a = +25c (note 6) v out = 1.25v -0.03 +0.03 % tc v out output voltage temperature coefficient (note 8) isl21090 b grade 7 ppm/c v in input voltage range v out = 1.25v 3.7 36 v i in supply current 0.750 1.28 ma v out / v in line regulation v in = 3.7v to 36v, v out = 1.25v 6 17 ppm/v v out / i out load regulation sourcing: 0ma i out 20ma 2.5 17 ppm/ma sinking: -10ma i out 0ma 2.5 17 ppm/ma v d dropout voltage (note 9) v out = 1.25v @ 10ma 1.7 2.15 v i sc+ short circuit current t a = +25c, v out tied to gnd 53 ma i sc- short circuit current t a = +25c, v out tied to v in -23 ma t r turn-on settling time 90% of final value, c l = 1.0f, c c =open 150 s ripple rejection f = 120hz 90 db e np-p voltage noise 0.1hz f 10hz, v out = 1.25v 1.0 v p-p v n broadband voltage noise 10hz f 1khz, v out = 1.25v 1.2 v rms e n noise voltage density f = 1khz, v out = 1.25v 35.4 nv/ hz v out / t long term stability t a = +25c 20 ppm
isl21090 4 fn6993.3 november 21, 2012 electrical specifications v in = 5v (2.5v option), i out = 0 unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. parameter description conditions min (note 7) typ max (note 7) unit v out output voltage v in = 5v 2.5 v v oa v out accuracy @ t a = +25c all v out options -0.02 +0.02 % tc v out output voltage temperature coefficient isl21090 b grade 7 ppm/c v in input voltage range v out = 2.5v 3.7 36 v i in supply current 0.930 1.28 ma v out / v in line regulation v in = 3.7v to 36v, v out = 2.5v 8 18 ppm/v v out / i out load regulation sourcing: 0ma i out 20ma 2.5 17 ppm/ma sinking: -10ma i out 0ma 2.5 17 ppm/ma v d dropout voltage (note 9) v out = 2.5v @ 10ma 1.1 1.7 v i sc+ short circuit current t a = +25c, v out tied to gnd 55 ma i sc- short circuit current t a = +25c, v out tied to v in -61 ma t r turn-on settling time 90% of final value, c l = 1.0f, c c = open 150 s ripple rejection f = 120hz 90 db e np-p noise voltage 0.1hz f 10hz, v out = 2.5v 1.9 v p-p v n broadband voltage noise 10hz f 1khz, v out = 2.5v 1.6 v rms e n noise voltage density f = 1khz, v out = 2.5v 50 nv/ hz electrical specifications v in = 10.0v (5.0v option), i out = 0unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. parameter description conditions min (note 7) typ max (note 7) unit v out output voltage v in = 10.0v, 5.0 v v oa v out accuracy @ t a = +25c (note 6) v out = 5.0v 0.025 0.025 % tc v out output voltage temperature coefficient (note 8) isl21090 b grade 7 ppm/c v in input voltage range v out = 5.0v 736 v i in supply current 0.930 1.33 ma v out / v in line regulation v in = 7.0v to 36v, v out = 5.0v 8 18 ppm/v v out / i out load regulation sourcing: 0ma i out 20ma 2.5 17 ppm/ma sinking: -10ma i out 0ma 2.5 17 ppm/ma v d dropout voltage (note 9) v out = 5.0v @ 10ma 1.1 1.7 v i sc+ short circuit current t a = +25c, v out tied to gnd 61 ma i sc- short circuit current t a = +25c, v out tied to v in -75 ma t r turn-on settling time 90% of final value, c l = 1.0f, c c = open 150 s ripple rejection f = 120hz 90 db
isl21090 5 fn6993.3 november 21, 2012 e np-p output voltage noise 0.1hz f 10hz, v out = 5.0v 4.2 v p-p v n broadband voltage noise 10hz f 1khz, v out = 5.0v 3.2 v rms e n noise voltage density f = 1khz, v out = 5.0v 100 nv/ hz notes: 7. compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design. 8. over the specified temperature range. temperature coefficient is measured by the box method whereby the change in vout is div ided by the temperature range; in this case, -40c to +125c = +165c. 9. dropout voltage is the minimum vin - vout differential voltage measured at the poin t where vout drops 1mv from vin = nominal at t a = +25c. electrical specifications v in = 10.0v (5.0v option), i out = 0unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. (continued) parameter description conditions min (note 7) typ max (note 7) unit
isl21090 6 fn6993.3 november 21, 2012 typical performance curves (isl21090-1.25v) figure 3. i in vs v in , three units figure 4. i in vs v in , three temperatures figure 5. line regulation, three units figure 6. line regulation, three temperatures figure 7. line transient with 10nf load ( v in = 500mv) figure 8. line transient with 100nf load ( v in = 500mv) 550 600 650 700 750 800 850 900 3.7 8.7 13.7 18.7 23.7 28.7 33.7 i d d ( a ) v in (v) unit 3 unit 2 unit 1 400 500 600 700 800 900 1000 1100 1200 3.7 8.7 13.7 18.7 23.7 28.7 33.7 i d d ( a ) v in (v) +25c -40c +125c 1.2496 1.2497 1.2498 1.2499 1.2500 1.2501 1.2502 1.2503 3.7 8.7 13.7 18.7 23.7 28.7 33.7 38.7 li n e r e g u la ti o n ( v ) v in (v) unit 1 unit 2 unit 3 1.2494 1.2495 1.2496 1.2497 1.2498 1.2499 1.2500 1.2501 1.2502 1.2503 3.7 8.7 13.7 18.7 23.7 28.7 33.7 li n e r e g u la ti o n ( v ) v in (v) +25c -40c +125c -4 -3 -2 -1 0 1 2 3 0 102030405060708090100 a m p l i tu d e ( m v ) time (s) -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 0 102030405060708090100 a m p li tu d e ( m v ) time (s)
isl21090 7 fn6993.3 november 21, 2012 figure 9. load regulation, three temperature figure 10. load transient ( i load = 1ma) figure 11. turn on time with 0.1f figure 12. turn on time with 1f figure 13. z out vs frequency ( comp = 0.01f) figure 14. psrr at different capacitive loads typical performance curves (isl21090-1.25v) (continued) -30 -20 -10 0 10 20 30 40 50 -25 -20 -15 -10 -5 0 5 10 15 v ou t ( v ) sourcing i load (ma) sinking +25c -40c +125c -30 -20 -10 0 10 20 30 0 200 400 600 800 1000 1200 time (s) a m p li tu d e ( m v ) 100nf 1f -1 0 1 2 3 4 5 6 0 50 100 150 200 250 300 350 400 450 500 550 time (s) v out = 0.1f v in v out (v) -1 0 1 2 3 4 5 6 0 50 100 150 200 250 300 350 400 450 500 550 time (s) v out (v) v out 1f v in 0.0001 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k 1m 10m z o u t ( ? ) frequency (hz) c l = 1f c l = 100nf c l = 10f c l = 10nf c l = 1nf -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k 1m 10m frequency (hz) psrr (db) 100nf 1f
isl21090 8 fn6993.3 november 21, 2012 figure 15. short circuit to gnd figure 16. short circuit to v in figure 17. v out vs noise, 0.1hz to 10hz figure 18. dropout with -10ma load typical performance curves (isl21090-1.25v) (continued) -65 -60 -55 -50 -45 -40 -35 -30 3.7 8.7 13.7 18.7 23.7 28.7 33.7 v in (v) current (ma) +125c +25c -40c 0 10 20 30 40 50 60 70 80 90 100 3.7 8.7 13.7 18.7 23.7 28.7 33.7 v in (v) current (ma) +125c +25c -40c x = 1s/div y = 0.5v/div 1.2490 1.2492 1.2494 1.2496 1.2498 1.2500 1.2502 3.7 8.7 13.7 18.7 23.7 28.7 33.7 v in (v) v out (v) +85c -40c +25c
isl21090 9 fn6993.3 november 21, 2012 typical performance curves (isl21090-2.5) figure 19. i in vs v in , three units figure 20. i in vs v in , three temperatures figure 21. line regulation, three units fig ure 22. line regulation, three temperatures figure 23. line transient with 1nf load ( v in = 500mv) figure 24. line transient with 100nf load ( v in = 500mv) 880 900 920 940 960 980 1000 4 9 14 19 24 29 34 39 i i n ( a ) v in (v) unit 1 unit 2 unit 3 600 700 800 900 1000 1100 1200 1300 4 9 14 19 24 29 34 39 i i n ( a ) v in (v) +25c -40c +125c 2.499690 2.499790 2.499890 2.499990 2.500090 2.500190 2.500290 2.500390 3 6 9 12151821242730333639 v in (v) unit 1 unit 2 unit 3 v out (v) 2.498800 2.499000 2.499200 2.499400 2.499600 2.499800 2.500000 4 9 14 19 24 29 34 39 2.500200 +25c -40c +125c v in (v) v out (v) -30 -20 -10 0 10 20 30 0 102030405060708090100 time (s) cl = 1nf amplitude (mv) -30 -20 -10 0 10 20 30 0 102030405060708090100 time (s) cl = 100nf amplitude (mv)
isl21090 10 fn6993.3 november 21, 2012 figure 25. load regulation, three temperatures figure 26. load transient ( i load = 1ma) figure 27. turn-on time with 0.1f figure 28. turn-on time with 1f figure 29. z out vs frequency figure 30. psrr at different capacitive loads typical performance curves (isl21090-2.5) (continued) -40 -30 -20 -10 0 10 20 30 -25 -20 -15 -10 -5 0 5 10 15 20 (sourcing) (sinking) i load (ma) +25c -40c +125c v out (v) -6 -4 -2 0 2 4 6 0 20406080100120 time (s) amplitude (mv) cl = no load cl = 100nf cl = 1f -1 0 1 2 3 4 5 6 0 50 100 150 200 250 300 350 400 time (s) v out (v) cl = 0.1f vin -1 0 1 2 3 4 5 6 0 50 100 150 200 250 300 350 400 time (s) v out (v) cl = 1f vin 0.01 0.1 1 10 100 1000 10 100 1k 10k 100k 1m 10m frequency (hz) cl = no load cl = 100nf cl = 10nf cl = 1nf zout ( ) -140 -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k 1m 10m frequency (hz) psrr (db) cl = no load cl = 1nf cl = 100nf cl = 10nf
isl21090 11 fn6993.3 november 21, 2012 figure 31. short-circuit to gnd figure 32. short-circuit to v in figure 33. v out vs temperature, 10 units figure 34. v out vs noise, 0.1hz to 10hz figure 35. dropout with -10ma load figure 36. long term stability typical performance curves (isl21090-2.5) (continued) -65 -60 -55 -50 -45 -40 -35 -30 3 8 13 18 23 28 33 38 v in (v) current (ma) +125c +25c -40c 30 40 50 60 70 80 90 3 8 13 18 23 28 33 38 v in (v) current (ma) +125c +25c -40c 2 . 4 9 8 0 2 . 4 9 8 5 2 . 4 9 9 0 2 . 5 0 0 0 2 . 5 0 0 5 2 . 5 0 1 0 -55 -35 -15 5 25 45 65 85 105 125 145 temperature (c) typical temperature v out (v) coefficient curve for 10 units 2 . 4 9 9 5 x = 10s/div y = 1v/div 2.4988 2.4990 2.4992 2.4994 2.4996 2.4998 2.5000 0 5 10 15 20 25 30 35 40 vin (v) v out (v) +85c -40c +25c -30 -20 -10 0 10 20 30 40 50 0 500 1000 1500 2000 2500 3000 p p m time (hrs)
isl21090 12 fn6993.3 november 21, 2012 typical performance curves (isl21090-5.0) figure 37. i in vs v in , three units figure 38. i in vs v in , three temperatures figure 39. line regulation, three units fig ure 40. line regulation, three temperatures figure 41. line transient with 1nf load ( v in = 500mv) figure 42. line transient with 100nf load ( v in = 500mv) 850 900 950 1000 1050 1100 1150 7 12 17 22 27 32 37 v in (v) i in (a) unit 3 unit 2 unit 1 600 700 800 900 1000 1100 1200 1300 7 12 17 22 27 32 37 v in (v) i in (a) +125c -40c +25c 4.99970 4.99980 4.99990 5.00000 5.00010 5.00020 5.00030 5.00040 5.00050 5.00060 5.00070 7 12 17 22 27 32 37 v in (v) unit 3 unit 2 unit 1 v out (v) 4.99700 4.99750 4.99800 4.99850 4.99900 4.99950 5.00000 5.00050 5.00100 7 12 17 22 27 32 37 v in (v) v out (v) +125c -40c +25c -30 -20 -10 0 10 20 30 0 10 20 30 40 50 60 70 80 90 100 time (s) c l = 1nf amplitude (mv) -30 -20 -10 0 10 20 30 0 10 20 30 40 50 60 70 80 90 100 c l = 100nf time (s) amplitude (mv)
isl21090 13 fn6993.3 november 21, 2012 figure 43. load regulation, three temperatures figure 44. load transient ( i load = 1ma) figure 45. turn-on time with 0.1f figure 46. turn-on time with 1f figure 47. z out vs frequency figure 48. psrr at different capacitive loads typical performance curves (isl21090-5.0) (continued) -1200 -1000 -800 -600 -400 -200 0 200 400 -20 -15 -10 -5 0 5 10 i load (ma) sourcing sinking v out (v) +125c -40c +25c -10 -8 -6 -4 -2 0 2 4 6 8 10 0 20 40 60 80 100 120 140 160 180 200 time (s) amplitude (mv) c l = 100nf c l = 1f -2 0 2 4 6 8 10 12 0 50 100 150 200 250 300 350 400 time (s) v out (v) c l = 0.1f v in -2 0 2 4 6 8 10 12 0 50 100 150 200 250 300 350 400 c l = 1f v in time (s) v out (v) c l = 100nf c l = 0 c l = 10nf c l = 1nf 0.01 0.1 1 10 100 1000 10 100 1k 10k 100k 1m 10m frequency (hz) z out ( ) c l = 10nf c l = 100nf -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k 1m 10m frequency (hz) psrr (db) c l = 0 c l = 1nf
isl21090 14 fn6993.3 november 21, 2012 figure 49. short-circuit to gnd figure 50. short-circuit to v in figure 51. v out vs noise, 0.1hz to 10hz figure 52. dropout with -10ma load typical performance curves (isl21090-5.0) (continued) -80 -70 -60 -50 -40 -30 -20 7 12 17 22 27 32 37 v in (v) isc (ma) +125c -40c +25c 20 30 40 50 60 70 80 90 100 7 12 17 22 27 32 37 v in (v) isc (ma) +125c -40c +25c -5 -4 -3 -2 -1 0 1 2 3 4 5 0 1 2 3 4 5 6 7 8 9 10 time (s) input noise voltage (v) 4.80 4.85 4.90 4.95 5.00 5.05 5.10 6.00 6.10 6.20 6.30 6.40 6.50 6.60 6.70 6.80 6.90 7.00 v in (v) v out (v) -40c +25c +125c
isl21090 15 fn6993.3 november 21, 2012 device operation precision bandgap reference the isl21090 uses a bandgap architecture and special trimming circuitry to produce a temperature compensated, precision voltage reference with high input voltage capability and moderate output current drive. low noise performance is achieved using optimized biasing techniques. key features for precision low noise portable applications, such as handheld meters and instruments are supply current (900a) and noise (0.1hz to 10hz bandwidth) 1.0v p-p to 4.6v p-p . data converters in particular can utilize the isl21090 as an external voltage reference. low power dac and adc circuits will realize maximum resolution with lowest noise. the device maintains output voltage during conversion cycles with fast response, although it is helpful to add an output capacitor, typically 1 f. in case of the 1.25v option, a 0.01f capacitor must be added to the comp (pin 3) for stabilization purposes. and a minimu m of 0.1f capacitor must be added at the output. applications information board mounting considerations for applications requiring th e highest accuracy, the board mounting location should be reviewed. the device uses a plastic soic package, which subjects th e die to mild stresses when the printed circuit (pc) board is heated and cooled, which slightly changes the shape. because of these die stresses, placing the device in areas subject to slight twisting can cause degradation of reference voltage accuracy. it is normally best to place the device near the edge of a board, or on the shortest side, because the axis of bending is most limited in that location. mounting the device in a cutout also minimize s flex. obviously, mounting the device on flexprint or extremely thin pc material will likewise cause loss of reference accuracy. board assembly considerations some pc board assembly prec autions are necessary. normal output voltage shifts of 100v to 500v can be expected with pb-free reflow profiles or wave solder on multi-layer fr4 pc boards. precautions should be ta ken to avoid excessive heat or extended exposure to high reflow or wave solder temperatures. noise performance and reduction the output noise voltage in a 0.1h z to 10hz bandwidth is typically 1.9v p-p ( v out = 2.5v). the noise meas urement is made with a bandpass filter. the filter is made of a 1-pole high-pass filter, with a corner frequency at 0.1hz, and a 2-pole low-pass filter, with a corner frequency (3db) at 9.9hz, to create a filter with a 9.9hz bandwidth. noise in the 10hz to 1khz bandwidth is approximately 1.6v rms (v out = 2.5v), with 0.1f capacitance on the output. this noise measurement is made wi th a 2 decade bandpass filter. the filter is made of a 1-pole high-pass filter with a corner frequency at 10hz of the center frequency, and 1-pole low-pass filter with a corner frequency at 1khz. load capacitance up to 10f can be added but will result in only marginal improvements in output noise and transient response. turn-on time normal turn-on time is typically 150s, as shown in figure 28. the circuit designer must take this into account when looking at power-up delays or sequencing. temperature coefficient the limits stated for temperature coefficient (tempco) are governed by the method of measurement. the overwhelming standard for specifying the temperature drift of a reference is to measure the reference voltage at two temperatures, take the total variation, (v high ? v low ), and divide by the temperature extremes of measurement (t high ?t low ). the result is divided by the nominal reference voltage (at t = +25c) and multiplied by 10 6 to yield ppm/c. this is the ?box? method for specifying temperature coefficient. output voltage adjustment the output voltage can be adjusted above and below the factory-calibrated value via the trim terminal. the trim terminal is the negative feedback divider point of the output op amp. the positive input of the amplifier is about 1.216v, and in feedback, so will be the trim voltage. the trim terminal has a 5000 ? resistor to ground internally, and in the case of the 2.5v output version, there is a feedback resistor of approximately 5000 ? from v out to trim. the suggested method to adjust the output is to connect a very high value external resistor directly to the trim terminal and connect the other end to the wipe r of a potentiometer that has a much lower total resistance and whose outer terminals connect to v out and ground. if a 1m ? resistor is connected to trim, the output adjust range will be 6.3mv. it is important to minimize the capacitance on the trim terminal to preserve output amplifier stability. it is also best to conn ect the series resistor directly to the trim terminal, to minimize that capacitance and also to minimize noise injection. small trim adjustments will not disturb the factory-set temperature coefficient of the reference, but trimming near the extreme values can.
isl21090 16 intersil products are manufactured, assembled and tested utilizing iso9000 quality systems as noted in the quality certifications found at www.intersil.com/design/quality intersil products are sold by description only. intersil corporat ion reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnished by intersil is believed to be accurate and reliable. however, no responsi bility is assumed by intersil or its subsid iaries for its use; nor for any infringem ents of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of i ntersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com fn6993.3 november 21, 2012 for additional products, see www.intersil.com/product_tree about intersil intersil corporation is a leader in the design and manufacture of high-performance analog, mixed-signal and power management semiconductors. the company's products addr ess some of the fastest growing markets wi thin the industrial and infrastructure, personal computing and high-end consumer markets. for more inform ation about intersil or to find out how to become a member of our winning team, visit our website and career page at www.intersil.com . for a complete listing of applications, re lated documentation and related parts, plea se see the respective product information page. also, please check the product information page to ensure that you have the most updated datasheet: isl21090b12, isl21090b25, isl21090b50 to report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff reliability reports are available from our website at: http://rel.intersil.com/reports/search.php revision history the revision history provided is for inform ational purposes only and is believed to be accurate, but not warranted. please go t o web to make sure you have the latest revision. date revision change august 22, 2012 fn6993.3 added 5.0v option ?typical performance curves? table to page 12. removed 7.5v and 10v option electrical specs may 1, 2012 fn6993.2 added 5.0v option ?ele ctrical specifications? table to page 4. added 7.5v option ?electrical specifications? table to page 5. added 10.0v option ?electrical specifications? table to page 5. march 5, 2012 fn6993.1 added 1.25v option ?electrical specifications? table to page 3. added 1.25v typical performance curves section on page 6. changed min limit for v in 2.5v option on page 4. june 8, 2011 fn6993.0 initial release
isl21090 17 fn6993.3 november 21, 2012 package outline drawing m8.15e 8 lead narrow body small outline plastic package rev 0, 08/09 unless otherwise specified, tolerance : decimal 0.05 the pin #1 identifier may be either a mold or mark feature. interlead flash or protrusions shall not exceed 0.25mm per side. dimension does not include interlead flash or protrusions. dimensions in ( ) for reference only. dimensioning and tolerancing conform to amse y14.5m-1994. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: detail "a" side view ?a typical recommended land pattern top view a b 4 4 0.25 a mc b c 0.10 c 5 id mark pin no.1 (0.35) x 45 seating plane gauge plane 0.25 (5.40) (1.50) 4.90 0.10 3.90 0.10 1.27 0.43 0.076 0.63 0.23 4 4 detail "a" 0.22 0.03 0.175 0.075 1.45 0.1 1.75 max (1.27) (0.60) 6.0 0.20 reference to jedec ms-012. 6. side view ?b?

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