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1 precision, low noise fga? voltage references isl21007 the isl21007 fga? voltage references are extremely low power, high precision, and low noise voltage references fabricated on intersil?s propri etary floating gate analog technology. the isl21007 features very low noise (4.5v p-p for 0.1hz to 10hz) and very low operating current (150a, max). in addition, the isl21007 family features guaranteed initial accuracy as low as 0.5mv. this combination of high initia l accuracy, low drift, and low output noise performance of the isl21007 enables versatile high performance control and data acquisition applications with low power consumption. features ? reference output voltage . . . .1.250v, 2.048v, 2.500v, 3.000v ? initial accuracy . . . . . . . . . . . . . . . . . . . . . . . 0.5mv (b grade) ? input voltage range isl21007-12, 20, 25. . . . . . . . . . . . . . . . . . . . . . . 2.7v to 5.5v isl21007-30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2v to 5.5v ? low output voltage noise . . . . . . . . 4.5v p-p (0.1hz to 10hz) ? supply current . . . . . . . . . . . . . . . . . . . . . . . . . . . 150a (max) ? temperature coefficient . . . . . . . . . . . . . . 3ppm/c (b grade) ? operating temperature range. . . . . . . . . . .-40c to +125c ? package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 ld soic ? pb-free (rohs compliant) applications ? high resolution a/ds and d/as ? digital meters ? bar code scanners ?basestations ? battery management/monitoring ? industrial/instrumentation equipment related literature ? an1533 , ?x-ray effects on intersil fga references? ? an1494 , ?reflow and pc board assembly effects on intersil fga references? pin configuration isl21007 (8 ld soic) top view available options part number v out option (v) initial accuracy (mv) tempco. (ppm/c) isl21007bfb812z (note 1) 1.250 0.5 3 isl21007cfb812z 1.250 1.0 5 isl21007dfb812z 1.250 2.0 10 isl21007bfb820z (note 2) 2.048 0.5 3 isl21007cfb820z 2.048 1.0 5 ISL21007DFB820z 2.048 2.0 10 isl21007bfb825z (note 1) 2.500 0.5 3 isl21007cfb825z 2.500 1.0 5 isl21007dfb825z 2.500 2.0 10 isl21007bfb830z (note 3) 3.000 0.5 3 isl21007cfb830z 3.000 1.0 5 isl21007dfb830z 3.000 2.0 10 notes: 1. not recommended for new designs. recommended replacement part isl21009. 2. not recommended for new designs. recommended replacement part isl21007cfb820z. 3. not recommended for new designs. recommended replacement part isl21007cfb830z. gnd or nc vin dnc gnd 1 2 3 4 8 7 6 5 dnc dnc vout trim march 27, 2012 fn6326.10 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. 2007, 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.
isl21007 2 fn6326.10 march 27, 2012 ordering information part number (notes 4, 5, 6) part marking v out option (v) grade temp. range (c) package (pb-free) pkg. dwg. # isl21007bfb812z (note 7) 21007bf z12 1.250 0.5mv, 3ppm/c -40 to +125 8 ld soic m8.15 isl21007cfb812z 21007cf z12 1.250 1.0mv, 5ppm/c -40 to +125 8 ld soic m8.15 isl21007dfb812z 21007df z12 1.250 2.0mv, 10ppm/c -40 to +125 8 ld soic m8.15 isl21007bfb820z (note 8) 21007bf z20 2.048 0.5mv, 3ppm/c -40 to +125 8 ld soic m8.15 isl21007cfb820z 21007cf z20 2.048 1.0mv, 5ppm/c -40 to +125 8 ld soic m8.15 ISL21007DFB820z 21007df z20 2.048 2.0mv, 10ppm/c -40 to +125 8 ld soic m8.15 isl21007bfb825z (note 7) 21007bf z25 2.500 0.5mv, 3ppm/c -40 to +125 8 ld soic m8.15 isl21007cfb825z 21007cf z25 2.500 1.0mv, 5ppm/c -40 to +125 8 ld soic m8.15 isl21007dfb825z 21007df z25 2.500 2.0mv, 10ppm/c -40 to +125 8 ld soic m8.15 isl21007bfb830z (note 9) 21007bf z30 3.000 0.5mv, 3ppm/c -40 to +125 8 ld soic m8.15 isl21007cfb830z 21007cf z30 3.000 1.0mv, 5ppm/c -40 to +125 8 ld soic m8.15 isl21007dfb830z 21007df z30 3.000 2.0mv, 10ppm/c -40 to +125 8 ld soic m8.15 notes: 4. these intersil pb-free plastic packaged products employ specia l 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 with both snpb and pb-free soldering operation s). intersil pb-free products are msl classified at pb-free peak reflow temperatures th at meet or exceed the pb-free requirements of ipc/jedec j std -020. 5. add ?-t*? suffix for tape and reel. please refer to tb347 for details on reel specifications. 6. for moisture sensitivity level (msl), please see device information page for isl21007 . for more information on msl please see techbrief tb363 . 7. not recommended for new designs. re commended replacement part isl21009. 8. not recommended for new designs. recommended replacement part isl21007cfb820z. 9. not recommended for new designs. recommended replacement part isl21007cfb830z.
isl21007 3 fn6326.10 march 27, 2012 typical application circuit pin descriptions pin number pin name description 1 gnd or nc ground or no connection 2 vin power supply input connection 4gndground 5 trim allows user trim vout 2.5% 6 vout voltage reference output connection 3, 7, 8 dnc do not connect; internal connection - must be left floating figure 1. typical application precision 12-bit subranging dac c1 0.001f c1 10f low noise dac output isl21007-12, 20, 25, 30 gnd gnd nc nc nc trim vout vin 1 2 3 4 8 7 6 5 +3v x79000 sck a0 a1 a2 si so rdy up down oe cs clr vcc vh vl vref vss vout vbuf vfb 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 spi bus
isl21007 4 fn6326.10 march 27, 2012 absolute voltage ratings thermal information storage temperature range . . . . . . . . . . . . . . . . . . . . . . . .-65c to +150c max voltage v in to gnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5v to +6.5v max voltage v out to gnd (10s). . . . . . . . . . . . . . . . . . . . . . -0.5v to v out + 1 voltage on ?dnc? pins . . . . . . . . . no connections permitted to these pins. esd rating human body model (hbm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6kv machine model (mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600v charged device model (cdm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kv environmental operating conditions x-ray exposure (note 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mrem thermal resistance (typical, note 11) ja (c/w) 8 ld soic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113.12 continuous power dissipation (note 11). . . . . . . . . . . . . . . . . . .t a = +70c 8 ld soic derate 5.88mw/c above +70c. . . . . . . . . . . . . . . . . . 471mw pb-free reflow profile (note 12) . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/ pbfree/pb-freereflow.asp recommended operating conditions temperature range (full 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. important note: all parameters having min/max specifications ar e guaranteed. typ values are for information purposes only. unle ss otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: t j = t c = t a notes: 10. measured with no filtering, distance of 10? from source, in tensity set to 55kv and 70ma current, 30s duration. other exposur e levels should be analyzed for output voltage drift effects. see ?applications information? on page 16. 11. ja is measured with the component mounted on a high effective ther mal conductivity test board in free air. see tech brief tb379 f or details. 12. post-reflow drift for the isl21007 devices will range from 100 v to 1.0mv based on experimental results with devices on fr4 double sided boards. the design engineer must take this into account wh en considering the reference voltage after assembly. common electrical specifications (isl21007-12, -20, -25, -30) t a = -40c to +125c, unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. parameter description conditions min (note 16) typ max (note 16) unit v oa v out accuracy @ t a = +25c isl21007b -0.5 +0.5 mv isl21007c -1.0 +1.0 mv isl21007d -2.0 +2.0 mv tc v out output voltage temperature coefficient (note notes:) isl21007b 3 ppm/c isl21007c 5 ppm/c isl21007d 10 ppm/c i in supply current 75 150 a trim range 2.0 2.5 % t r turn-on settling time v out = 0.1% 120 s ripple rejection f = 10khz 60 db e n output voltage noise 0.1hz f 10hz 4.5 v p-p v n broadband voltage noise 10hz f 1khz 2.2 v rms noise density f = 1khz 60 nv/ hz electrical specifications (isl21007-12, v out = 1.250v) v in = 3.0v, t a = -40c to +125c, unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. parameter description conditions min (note 16) typ max (note 16) unit v in input voltage range 2.7 5.5 v v out output voltage 1.250 v v out / v in line regulation 2.7v < v in < 5.5v 100 700 v/v
isl21007 5 fn6326.10 march 27, 2012 v out / i out load regulation sourcing: 0ma i out 7ma 10 100 v/ma sinking: -7ma i out 0ma 20 150 v/ma i sc short circuit current t a = +25c, v out tied to gnd 40 ma v out / t a thermal hysteresis (note 14) t a = +165c 50 ppm v out / t long term stability (note 15) t a = +25c 100 ppm electrical specifications (isl21007-12, v out = 1.250v) v in = 3.0v, t a = -40c to +125c, unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. (continued) parameter description conditions min (note 16) typ max (note 16) unit electrical specifications (isl21007-20, v out = 2.048v) v in = 3.0v, t a = -40c to +125c, unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. parameter description conditions min (note 16) typ max (note 16) unit v in input voltage range 2.7 5.5 v v out output voltage 2.048 v v out / v in line regulation 2.7v < v in < 5.5v 50 200 v/v v out / i out load regulation sourcing: 0ma i out 7ma 10 100 v/ma sinking: -7ma i out 0ma 20 150 v/ma i sc short circuit current t a = +25c, v out tied to gnd 50 ma v out / t a thermal hysteresis (note 14) t a = +165c 50 ppm v out / t long term stability (note 15) t a = +25c 75 ppm electrical specifications (isl21007-25, v out = 2.500v) v in = 3.0v, t a = -40c to +125c, unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. parameter description conditions min (note 16) typ max (note 16) unit v in input voltage range 2.7 5.5 v v out output voltage 2.500 v v out / v in line regulation 2.7v < v in < 5.5v 50 200 v/v v out / i out load regulation sourcing: 0ma i out 5ma 10 100 v/ma sinking: -5ma i out 0ma 20 150 v/ma i sc short circuit current t a = +25c, v out tied to gnd 50 ma v out / t a thermal hysteresis (note 14) t a = +165c 50 ppm v out / t long term stability (note 15) t a = +25c 50 ppm electrical specifications (isl21007-30, v out = 3.000v) v in = 5.0v, t a = -40c to +125c, unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. parameter description conditions min (note 16) typ max (note 16) unit v in input voltage range 3.2 5.5 v v out output voltage 3.000 v v out / v in line regulation 3.2v < v in < 5.5v 50 200 v/v v out / i out load regulation sourcing: 0ma i out 7ma 10 100 v/ma sinking: -7ma i out 0ma 20 150 v/ma
isl21007 6 fn6326.10 march 27, 2012 i sc short circuit current t a = +25c, v out tied to gnd 50 ma v out / t a thermal hysteresis (note 14) t a = +165c 50 ppm v out / t long term stability (note 15) t a = +25c 50 ppm notes: 13. over the specified temperature range. temperature coefficien t is measured by the box method whereby the change in v out is divided by the temperature range; in this case, -40c to +125c = +165c. 14. thermal hysteresis is the change of v out measured at t a = +25c after temperature cycling over a specified range, t a . v out is read initially at t a = +25c for the device under test. the device is temperature cycled and a second v out measurement is taken at +25c. the difference between the initial v out reading and the second v out reading is then expressed in ppm. for t a = +165c, the device under test is cycled from +25c to +125c to -40c to +25c. 15. long term drift is logarithmic in nature and diminishes over time. drift after th e first 1000 hours will be approximately 10 ppm/ (1khrs). 16. compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design. electrical specifications (isl21007-30, v out = 3.000v) v in = 5.0v, t a = -40c to +125c, unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. (continued) parameter description conditions min (note 16) typ max (note 16) unit
isl21007 7 fn6326.10 march 27, 2012 typical performance curves (isl21007-12) (r ext = 100k ) figure 2. i in vs v in (3 units) figure 3. i in vs v in over temperature figure 4. line regulation (3 units) figure 5. line regulation over temperature figure 6. load regulation over temperature figure 7. v out vs temperature (3 units) 0 20 40 60 80 100 120 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 v in (v) i in (a) unit 3 unit 1 unit 2 60 65 70 75 80 85 90 95 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v in (v) i in (a) +125c +25c -40c 1.24980 1.24985 1.24990 1.24995 1.25000 1.25005 1.25010 1.25015 v out (v) (normalized to 1.250v at v in = 3.0v) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v in (v) unit 3 unit 1 unit 2 -300 -250 -200 -150 -100 -50 0 50 100 150 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 v in (v) v o (v) (normalized to v in = 3.0v) +125c +25c -40c -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 -7 -6 -5 -4 -3 -2 -1 0 1 sinking sourcing v out (mv) 234567 output current (ma) +125c +25c -40c 1.24975 1.24980 1.24985 1.24990 1.24995 1.25000 1.25005 1.25010 -40 -20 0 20 40 60 80 100 120 140 temperature (c) v out (v) unit 2 unit 1 unit 3
isl21007 8 fn6326.10 march 27, 2012 figure 8. psrr vs capacitive loads figure 9. line transient re sponse, no capacitive load figure 10. line transient response, 0.001f load capacitance figure 11. turn-on time figure 12. z out vs frequency figure 13. v out noise, 0.1hz to 10hz typical performance curves (isl21007-12) (r ext = 100k ) (continued) -100 -80 -60 -40 -20 0 1.00e+00 1.00e+02 1.00e+04 1.00e+0 frequency (hz) psrr (db) 1nf load 100nf load 10nf load 1f load no load y: 10s/div x: 200mv/div v in = -0.3v v in = +0.3v y: 10s/div x: 200mv/div v in = -0.3v v in = +0.3v v in v out = 1.25v x: 20s/div y: 1v/div 0 20 40 60 80 100 120 140 1.00e+00 1.00e+01 1.00e+02 1.00e +03 1.00e+04 1.00e+05 1.00e+06 frequency (hz) z out ( ) no load 1nf 10nf 100nf 2mv/div gain is x1000, noise is 4.5v p-p
isl21007 9 fn6326.10 march 27, 2012 figure 14. load transient response typical performance curves (isl21007-12) (r ext = 100k ) (continued) no output capacitance +7ma -7ma x: 50s/div y: 1v/div typical performance curves (isl21007-20) (r ext = 100k ) figure 15. i in vs v in (3 units) figure 16. i in vs v in over temperature figure 17. line regulation (3 units) figure 18. line regulation over temperature 65 70 75 80 85 90 95 2.73.13.53.94.34.75.15.5 v in (v) i in (a) unit 3 unit 2 unit 1 50 55 60 65 70 75 80 85 90 95 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 v in (v) i in (ua) +125c -40c +25c 2.04790 2.04795 2.04800 2.04805 2.04810 2.04815 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v in (v) v out (v) normalized to 2.048v at v in = 3.0v unit 1 unit 3 unit 2 2.04795 2.04800 2.04805 2.04810 2.04815 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v in (v) +125c +25c -40c v out (v) (normalized to 2.048v at v in = 3v)
isl21007 10 fn6326.10 march 27, 2012 figure 19. load regulation over temperature figure 20. v out vs temperature (3 units) figure 21. psrr vs capacitive loads figure 22. line transient response, no capacitive load figure 23. line transient response, 0.001f load capacitance figure 24. turn-on time typical performance curves (isl21007-20) (r ext = 100k ) (continued) -1.2 -0.8 -0.4 0.0 0.4 0.0 1.2 1.6 -7 -6 -5 -4 -3 -2 -1 v out (mv) normalized to 0ma 0 123456 7 +25c -40c +125c sinking sourcing output current (ma) 2.0472 2.0476 2.0480 2.0484 2.0488 2.0492 2.0496 -40-25-10 5 203550658095110125 temperature (c) v out (v) normalized to 2.048v at +25c unit 2 unit 1 unit 3 -100 -80 -60 -40 -20 0 1.0e+01 1.0e+03 1.0e+05 frequency (hz) psrr (db) 100nf load 10nf load 1f load no load y: 10s/div x: 200mv/div v in = -0.3v v in = +0.3v y: 10s/div x: 200mv/div v in = -0.3v v in = +0.3v x: 100s/div y: 2v/div v in v out = 2.048v
isl21007 11 fn6326.10 march 27, 2012 figure 25. z out vs frequency figure 26. v out noise, 0.1hz to 10hz figure 27. load transient response, 0.001f load capacitance figure 28. load transient response, no capacitive load typical performance curves (isl21007-20) (r ext = 100k ) (continued) 0 20 40 60 80 100 120 140 1.00e+00 1.00e+01 1.00e+02 1.00e +03 1.00e+04 1.00e+05 1.00e+06 frequency (hz) z out ( ) no load 1nf 10nf 100nf gain is x1000, noise is 4.5v p-p 2mv/div x: 20s/div y: 200mv/div +7ma -7ma x: 20s/div y: 200mv/div +7ma -7ma typical performance curves (isl21007-25) (r ext = 100k ) figure 29. i in vs v in (3 units) figure 30. i in vs v in over temperature 0 20 40 60 80 100 120 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 v in (v) i in (a) unit 3 unit 2 unit 1 60 65 70 75 80 85 90 95 100 2.5 3.0 4.0 4.5 5.0 5.5 v in (v) i in (a) 3.5 +125c +25c -40c
isl21007 12 fn6326.10 march 27, 2012 figure 31. line regulation (3 units) figu re 32. line regulation over temperature figure 33. load regulation over temperature figure 34. v out vs temperature (3 units) figure 35. psrr vs capacitive loads figure 36. line transient response, no capacitive load typical performance curves (isl21007-25) (r ext = 100k ) (continued) 2.4996 2.4997 2.4998 2.4999 2.5000 2.5001 2.5002 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v in (v) v out (v) (normalized to 2.500v at v in = 3v) unit 1 unit 2 unit 3 -400 -350 -300 -250 -200 -150 -100 -50 0 50 100 2.5 3.0 3.5 4.5 5.0 5.5 v in (v) v o (v) (normalized to v in = 3.0v) 4.0 6.0 +125c +25c -40c -1.0 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 -7 -2 1 2 3 4 5 6 7 v out (mv) -6 -5 -4 -3 -1 0 +125c -40c +25c sinking sourcing output current (ma) 2.4993 2.4994 2.4995 2.4996 2.4997 2.4998 2.4999 2.5000 2.5001 2.5002 2.5003 -40 -20 0 20 40 60 80 100 120 140 temperature (c) v out (v) unit 1 unit 2 unit 3 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 1.e+00 1.e+02 1.e+04 1.e+06 frequency (hz) psrr (db) 10nf no load 1nf 100nf 1f y: 10s/div x: 200mv/div v in = -0.3v v in = +0.3v
isl21007 13 fn6326.10 march 27, 2012 figure 37. line transient response, 0.001f load capacitance figure 38. turn-on time figure 39. z out vs frequency figure 40. v out noise, 0.1hz to 10hz figure 41. load transient response typical performance curves (isl21007-25) (r ext = 100k ) (continued) y: 10s/div x: 200mv/div v in = -0.3v v in = +0.3v v in v out = 2.5v x: 20s/div y: 1v/div 0 20 40 60 80 100 120 140 1.00e+00 1.00e+01 1.00e+02 1.00e +03 1.00e+04 1.00e+05 1.00e+06 frequency (hz) z out ( ) no load 1nf 10nf 100nf 2mv/div gain is x1000, noise is 4.5v p-p no output capacitance +5ma -5ma x: 50s/div y: 500mv/div
isl21007 14 fn6326.10 march 27, 2012 typical performance curves (isl21007-30) (r ext = 100k ) figure 42. i in vs v in (3 units) figure 43. i in vs v in over temperature figure 44. line regulation (3 units) figure 45. line regulation over temperature figure 46. load regulation over temperature figure 47. v out vs temperature (3 units) 0 20 40 60 80 100 120 3.2 3.7 4.2 4.7 5.2 v in (v) i in (a) unit 3 unit 2 unit 1 0 20 40 60 80 100 120 3.2 3.7 4.2 4.7 5.2 v in (v) i in (a) +125c +25c -40c -40c 2.9955 2.9965 2.9975 2.9985 2.9995 3.0005 3.2 3.6 4.0 4.4 4.8 5.2 5.6 v in (v) v out (v) normalized to 3.0v at 5.0v in unit 3 unit 2 unit 1 2.994 2.995 2.996 2.997 2.998 2.999 3.000 3.001 3.2 3.6 4.0 4.4 4.8 5.2 5.6 v in (v) v out (v) normalized to 3.0v at 5.0v in +125c -40c +25c -0.25 -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 -7 -6 -5 -4 -3 -2 -1 sinking load (ma) sourcing v out (mv) normalized to 0ma 01 234 567 -40c +25c +125c 2.9990 2.9992 2.9994 2.9996 2.9998 3.0000 3.0002 3.0004 3.0006 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature (c) v out (v) normalized to 3.0v at +25c unit 3 unit 2 unit 1
isl21007 15 fn6326.10 march 27, 2012 figure 48. psrr vs capacitive loads figure 49. line transient response, no capacitive load figure 50. line transient response, 0.001f load capacitance figure 51. turn-on time figure 52. z out vs frequency figure 53. v out noise, 0.1hz to 10hz typical performance curves (isl21007-30) (r ext = 100k ) (continued) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 1.e+00 1.e+02 1.e+04 1.e+06 frequency (hz) psrr (db) 10nf no load 1nf 100nf 1f v in (dc) = 5.0v v in (ac) = 50mv p-p y: 10s/div x: 200mv/div v in = -0.5v v in = +0.5v y: 10s/div x: 200mv/div v in = -0.5v v in = +0.5v v in = 5.0v v out = 3.0v 20s/div 1v/div 0 20 40 60 80 100 120 140 1.00e+00 1.00e+01 1.00e+02 1.00e +03 1.00e+04 1.00e+05 1.00e+06 frequency (hz) z out ( ) no load 1nf 10nf 100nf 2mv/div gain is x1000, noise is 4.5v p-p
isl21007 16 fn6326.10 march 27, 2012 applications information fga technology the isl21007 voltage reference uses floating gate technology to create references with very low drift and supply current. essentially, the charge stored on a floating gate cell is set precisely in manufacturing. the re ference voltage output itself is a buffered version of the floating gate voltage. the resulting reference device has excellent characteristics which are unique in the industry: very low temperature drift, high initial accuracy, and almost zero supply current. al so, the reference voltage itself is not limited by voltage bandgaps or zener settings, so a wide range of reference voltages can be programmed (standard voltage settings are provided, but customer-specific voltages are available). the process used for these reference devices is a floating gate cmos process, and the amplifier circuitry uses cmos transistors for amplifier and output transistor circuitry. while providing excellent accuracy, there are limitat ions in output noise level and load regulation due to the mos device characteristics. these limitations are addressed with ci rcuit techniques discussed in other sections. micropower operation the isl21007 consumes extremely low supply current due to the proprietary fga technology. low noise performance is achieved using optimized biasing techniques. supply current is typically 75a and noise is 4.5v p-p benefitting precision, low noise portable applications such as handheld meters and instruments. data converters in particular can utilize the isl21007 as an external voltage reference. low power dac and adc circuits will realize maximum resolution with lowest noise. handling and board mounting fga references provide excellent initial accuracy and low temperature drift at the expense of very little power drain. there are some precautions to take to insure this accuracy is not compromised. excessive heat du ring solder reflow can cause excessive initial accuracy drift, so the recommended +260c max temperature profile should not be exceeded. expect up to 1mv drift from the solder reflow process. fga references are susceptible to excessive x-radiation like that used in pc board manufacturing. initial accuracy can change 10mv or more under extreme radiation. if an assembled board needs to be x-rayed, care should be taken to shield the fga reference device. board mounting considerations for applications requiring the hi ghest accuracy, board mounting location should be reviewed. placing the device in areas subject to slight twisting can cause degrad ation of the accuracy of the reference voltage due to die stresses. it is normally best to place the device near the edge of a board, or the shortest side, as the axis of bending is most limited at that location. obviously, mounting the device on flexprint or extremely thin pc material will likewise cause loss of reference accuracy. board assembly considerations fga references provide high accuracy and low temperature drift but some pc board assembly pr ecautions are necessary. normal output voltage shifts of 100v to 1mv 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, this may reduce device initial accuracy. post-assembly x-ray inspection may also lead to permanent changes in device output voltag e and should be minimized or avoided. if x-ray inspection is required, it is advisable to monitor the reference output voltage to verify excessive shift has not occurred. if large amounts of shift are observed, it is best to add an x-ray shield consisting of thin zinc (300m) sheeting to allow clear imaging, yet block x-ray energy that affects the fga reference. special applications considerations in addition to post-assembly exam ination, there are also other x- ray sources that may affect the fga reference long term accuracy. airport screening machines contain x-rays and will figure 54. load transient response typical performance curves (isl21007-30) (r ext = 100k ) (continued) +7ma -7ma 100s/div 200mv/div
isl21007 17 fn6326.10 march 27, 2012 have a cumulative effect on the voltage reference output accuracy. carry-on luggage screening uses low level x-rays and is not a major source of output voltage shift, however, if a product is expected to pass through that type of screening over 100 times, it may need to consider shielding with copper or aluminum. checked luggage x-rays are higher intensity and can cause output voltage shift in much fewer passes, thus devices expected to go through those machines should definitely consider shielding. note that just two layers of 1/2 ounce copper planes will reduce the received dose by over 90%. the leadframe for the device which is on the bottom also provides similar shielding. if a device is expected to pass through luggage x-ray machines numerous times, it is advised to mount a 2-layer (minimum) pc board on the top, along with a ground plane underneath, which will effectively shield it from 50 to 100 passes through the machine. since these machines vary in x-ray dose delivered, it is difficult to produce an accurate maximum pass recommendation. noise performance and reduction the output noise voltage in a 0.1h z to 10hz bandwidth is typically 4.5v p-p . the noise measurement is ma de with a bandpass filter 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 at 12.6hz to create a filter with a 9.9hz bandwi dth. noise in the 10khz to 1mhz bandwidth is approximately 40v p-p with no capacitance on the output. this noise measuremen t is made with a 2 decade bandpass filter made of a 1-pole high-pass filter with a corner frequency at 1/10 of the center frequency and 1-pole low-pass filter with a corner frequency at 10 times the center frequency. load capacitance up to 1000pf can be added but will result in only marginal improvements in output noise and transient response. the output stage of th e isl21007 is not designed to drive heavily capacitive loads, so for load capacitances above 0.001f, the noise reduction ne twork shown in figure 55 is recommended. this network reduces noise significantly over the full bandwidth. noise is reduced to less than 20v p-p from 1hz to 1mhz using this network with a 0.01f capacitor and a 2k resistor in series with a 10f capacitor. also, transient response is improved with higher value output capacitor. the 0.01f value can be increased for better load transient response with little sacrifice in output stability. turn-on time the isl21007 devices have low supply current and thus the time to bias up internal circuitry to final values will be longer than with higher power references. normal turn-on time is typically 120s. this is shown in figure 10. circuit design 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 up or down by 2.5% by placing a potentiometer from v out to ground, and connecting the wiper to the trim pin. the trim input is high impedance, so no series resistance is needed. the resistor in the potentiometer should be a low tempco (<50ppm/c) and the resulting voltage divider should have very low tempco <5ppm/c. a digital potentiometer such as the isl95810 provides a low tempco resistance and excellent resistor and tempco matching for trim applications. see figure 59 and tb473 for further information. v in = 5.0v v in v o gnd isl21007 0.01f 10f 2k 0.1f 10f figure 55. handling high load capacitance
isl21007 18 fn6326.10 march 27, 2012 typical application circuits figure 56. precision 2.500v 50ma reference figure 57. 2.500v full scale low-drift, lo w noise, 10-bit adjustable voltage source figure 58. kelvin sensed load v in = +5.0v 2n2905 2.5v/50ma 0.001f v in v out gnd isl21007 r = 200 v out = 2.500v v in v out gnd +2.7 to 5.5v 0.1f 0.001f v out + ? v cc r h r l x9119 v ss sda scl 2-wire bus v out (buffered) 10f isl21007-25 v out = 2.500v el8178 (unbuffered) 0.1f +2.7 to 5.5v v in v out gnd isl21007-12 v out sense load + ? 10f el8178
isl21007 19 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 fn6326.10 march 27, 2012 for additional products, see www.intersil.com/product_tree figure 59. output adjustment using the trim pin typical application circuits (continued) 0.1f +2.7 to 5.5v v in v out gnd isl21007-12 10f trim 2.5v 2.5% r l v ss sda scl i2c bus v cc r h isl95810
isl21007 20 fn6326.10 march 27, 2012 package outline drawing m8.15 8 lead narrow body small outline plastic package rev 4, 1/12 detail "a" top view index area 123 -c- seating plane x 45 notes: 1. dimensioning and tolerancing per ansi y14.5m-1994. 2. package length does not include mold flash, protrusions or gate burrs. mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006 inch) per side. 3. package width does not include interlead flash or protrusions. interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per side. 4. the chamfer on the body is optional. if it is not present, a visual index feature must be located within the crosshatched area. 5. terminal numbers are shown for reference only. 6. the lead width as measured 0.36mm (0.014 inch) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch). 7. controlling dimension: millimeter. co nverted inch dimensions are not necessarily exact. 8. this outline conforms to jedec publication ms-012-aa issue c. side view ?a side view ?b? 1.27 (0.050) 6.20 (0.244) 5.80 (0.228) 4.00 (0.157) 3.80 (0.150) 0.50 (0.20) 0.25 (0.01) 5.00 (0.197) 4.80 (0.189) 1.75 (0.069) 1.35 (0.053) 0.25(0.010) 0.10(0.004) 0.51(0.020) 0.33(0.013) 8 0 0.25 (0.010) 0.19 (0.008) 1.27 (0.050) 0.40 (0.016) 1.27 (0.050) 5.20(0.205) 1 2 3 4 5 6 7 8 typical recommended land pattern 2.20 (0.087) 0.60 (0.023)

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