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precision 2.5 v, 5.0 v, and 10.0 v voltage references REF01/ref02/ref03 rev. k 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 ?2000C2010 analog devices, inc. all rights reserved. features high output accuracy REF01: 10.0 v, 0.3% maximum ref02: 5.0 v, 0.3% maximum ref03: 2.5 v, 0.6% maximum adjustable output: 3% minimum excellent temperature stability REF01: 8.5 ppm/c maximum ref02: 8.5 ppm/c maximum ref03: 50 ppm/c maximum low noise REF01: 30 v p-p typical ref02: 15 v p-p typical ref03: 6 v p-p typical high supply voltage range: up to 36 v maximum low supply current: 1.4 ma maximum high load-driving capability: 10 ma maximum temperature output function applications precision data systems high resolution converters industrial process control systems precision instruments military and aerospace applications general description the ref0x series of precision voltage references provide a stable 10.0 v, 5.0 v, or 2.5 v output with minimal change in response to variations in supply voltage, ambient temperature or load conditions. the parts are available in 8-lead soic, pdip, cerdip, and to-99 packages, as well as 20-terminal lcc packages (883 only), furthering the parts usability in both standard and high stress applications. with an external buffer and a simple resistor network, the temp terminal can be used for temperature sensing and approximation. a trim terminal is also provided on the device for fine adjustment of the output voltage. the small footprint, wide supply range, and application versatility make the ref0x series of references ideal for general- purpose and space-constrained applications. newer designs should use the adr0x series of references, which offer higher accuracy and temperature stability over a wider operating temperature range, while maintaining full pin- for-pin compatibility with the ref0x series. this data sheet applies to commercial-grade products only. contact sales or visit analog.com for military-grade (883) data sheets. table 1. selection guide part number output voltage input voltage range REF01 10.0 v 12 v to 36 v ref02 5.0 v 7.0 v to 36 v ref03 2.5 v 4.5 v to 36 v pin configurations 00375-001 REF01/ ref02/ ref03 top view (not to scale) nc 1 v in 2 temp 3 gnd 4 nc nc v out trim 8 7 6 5 nc = no connect. do not connect anything on these pins. some of them are reserved for factory testing purposes. figure 1. 8-lead pdip (p-suffix), 8-lead cerdip (z-suffix), 8-lead soic (s-suffix) 00375-002 1 2 3 4 5 6 7 8 nc ground (case) nc v in v out nc nc trim nc = no connect. do not connect anything on these pins. some of them are reserved for factory testing purposes. REF01/ ref02/ ref03 figure 2. 8-lead to-99 (j-suffix) 00375-003 4 nc 5 v in 6 nc 7 temp 8 nc 18 nc 17 nc 16 nc 15 v out 14 nc 19 nc 20 nc 1 nc 2 nc 3 nc 13 nc 12 trim 11 nc 10 gnd 9 nc REF01/ ref02 top view (not to scale) nc = no connect. do not connect anything on these pins. some of them are reserved for factory testing purposes. figure 3. 20-termina l lcc (rc-suffix; 883 parts only)
REF01/ref02/ref03 rev. k | page 2 of 20 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 pin configurations ........................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 REF01 specifications .................................................................... 3 ref02 specifications .................................................................... 4 ref03 specifications .................................................................... 5 absolute maximum ratings ............................................................ 6 thermal resistance ...................................................................... 6 esd caution .................................................................................. 6 pin configurations and function descriptions ........................... 7 typical performance characteristics ............................................. 8 terminology .................................................................................... 13 theory of operation ...................................................................... 14 input and output capacitors .................................................... 14 output adjustment .................................................................... 14 temperature monitoring ........................................................... 15 long-term stability ................................................................... 15 burn-in ........................................................................................ 15 power dissipation....................................................................... 15 applications information .............................................................. 16 basic reference application...................................................... 16 low cost current source .......................................................... 16 precision current source with adjustable output ................ 16 precision boosted output regulator ....................................... 16 bipolar voltage reference ......................................................... 17 adjustable reference with positive and negative swing ..... 17 outline dimensions ....................................................................... 18 REF01 ordering guide .............................................................. 20 ref02 ordering guide .............................................................. 20 ref03 ordering guide .............................................................. 20 revision history 10/10rev. j to rev. k deleted negative references section and figure 39; renumbered sequentially .............................................................. 16 10/09rev. j: initial version updated format .................................................................. universal combined REF01, ref02, and ref03 data sheets ....... universal changes to absolute maximum input voltage ............................. 6
REF01/ref02/ref03 rev. k | page 3 of 20 specifications REF01 specifications v in = 15 v, t a = 25c, i load = 0 ma, all grades, unless otherwise noted. parameter symbol conditions min typ max unit output voltage v o a and e grades 9.97 10.00 10.03 v h grade 9.95 10.00 10.05 v c grade 9.90 10.00 10.10 v output adjustment range 1 v trim a, e and h grades, pot = 10 k 3.0 3.3 % c grade, pot = 10 k 2.7 3.0 % initial accuracy v oerr a and e grades 30 mv 0.3 % h grade 50 mv 0.5 % c grade 100 mv 1.0 % temperature coefficient tcv o a and e grades, ?55c t a +125c 3.0 8.5 ppm/c h grade, 0c t a +70c 10 25 ppm/c c grade, 0c t a +70c (-j and -z packages) 20 65 ppm/c c grade, ?40 t a +85c (-p and -s packages) 20 65 ppm/c line regulation 2 ?v o /?v in a, e and h grades, v in = 13 v to 33 v 60 100 ppm/v a, e and h grades, v in = 13 v to 33 v, 0c t a +70c 70 120 ppm/v a, e and h grades, v in = 13 v to 33 v, ?55c t a +125c 90 150 ppm/v c grade, v in = 13 v to 33 v 90 150 ppm/v c grade, v in = 13 v to 30 v, 0c t a +70c (-j and -z packages) 110 180 ppm/v c grade, v in = 13 v to 30 v, ?40c t a +85c (-p and -s packages) 110 180 ppm/v load regulation 2 ?v o /?i load a and e grades, i load = 0 ma to 10 ma 50 80 ppm/ma a and e grades, i load = 0 ma to 8 ma, 0c t a +70c 60 100 ppm/ma a and e grades, i load = 0 ma to 8 ma, ?55c t a +125c 90 150 ppm/ma h grade, i load = 0 ma to 10 ma 60 100 ppm/ma h grade, i load = 0 ma to 8 ma, 0c t a +70c 70 120 ppm/ma h grade, i load = 0 ma to 8 ma, ?50c t a +125c 90 150 ppm/ma c grade, i load = 0 ma to 8 ma 60 150 ppm/ma c grade, i load = 0 ma to 5 ma, 0c t a +70c (-j and -z packages) 80 180 ppm/ma c grade, i load = 0 ma to 5 ma, ?40c t a +85c (-p and -s packages) 80 180 ppm/ma dropout voltage v do 2 v quiescent current i in a, e, and h grades 1.0 1.4 ma c grade 1.0 1.6 ma load current i load sourcing a, e, and h grades 10 ma c grade 8 ma sinking ?0.3 ma short circuit to gnd i sc v o = 0 v 30 ma voltage noise e n p-p 0.1 hz to 10.0 hz (-s, -z and -p packages) 30 v p-p 0.1 hz to 10.0 hz (-j package) 35 v p-p long-term stability 3 ?v o after 1000 hours of operation 50 ppm turn-on settling time t r output settling to within 0.1% of final value 5 s temperature sensor 4 voltage output at temp pin v temp 580 mv temperature sensitivity tcv temp 1.96 mv/c 1 refer to the output adjustment section. 2 specification includes the effects of self-heating. 3 long-term stability is noncumulative; the drift in subsequent 1000-hour periods is significantl y lower than in the first 1000- hour periods. refer to application note an-713 . 4 refer to the temperature monitoring section.
REF01/ref02/ref03 rev. k | page 4 of 20 ref02 specifications v in = 15 v, t a = 25c, i load = 0 ma, all grades, unless otherwise noted. nongraded refers to ref02z. parameter symbol conditions min typ max unit output voltage v o a and e grades 4.985 5.000 5.015 v h grade and nongraded 4.975 5.000 5.025 v c grade 4.950 5.000 5.050 v output adjustment range 1 v trim a, e, h grades and nongraded, pot = 10 k 3.0 6.0 % c grade, pot = 10 k 2.7 6.0 % initial accuracy v oerr a and e grades 15 mv 0.3 % h grade and nongraded 25 mv 0.5 % c grade 50 mv 1 % temperature coefficient tcv o a grade and non-graded, ?55c t a +125c 3 8.5 ppm/c e and h grades, 0c t a +70c 10 25 ppm/c c grade, 0c t a +70c (-j and -z packages) 20 65 ppm/c c grade, ?40 t a +85c (-p and -s packages) 20 65 ppm/c line regulation 2 ?v o /?v in a, e, h grades and nongraded, v in = 8 v to 36 v 60 100 ppm/v a, e, h grades and nongraded, v in = 8 v to 36 v, 0c t a +70c 70 120 ppm/v a, e, h grades and nongraded, v in = 8v to 36 v, ?55c t a +125c 90 150 ppm/v c grade, v in = 8 v to 36 v 90 150 ppm/v c grade, v in = 8 v to 36 v, 0c t a +70c (-j and -z packages) 110 180 ppm/v c grade, v in = 8 v to 36 v,?40c t a +85c (-p and -s packages) 110 180 ppm/v load regulation 2 ?v o /?i load a and e grades, i load = 0 ma to 10 ma 60 100 ppm/ma a and e grades, i load = 0 ma to 8 ma, 0c t a +70c 60 100 ppm/ma a and e grades, i load = 0 ma to 8 ma, ?55c t a +125c 70 120 ppm/ma h grade and nongraded, i load = 0 ma to 10 ma 60 100 ppm/ma h grade and nongraded, i load = 0 ma to 8 ma, 0c t a +70c 70 120 ppm/ma h grade and nongraded, i load = 0 ma to 8 ma, ?50c t a +125c 90 150 ppm/ma c grade, i load = 0 ma to 8 ma 60 150 ppm/ma c grade, i load = 0 ma to 5 ma, 0c t a +70c (-j and -z packages) 80 180 ppm/ma c grade, i load = 0 ma to 5 ma, ?40c t a +85c (-p and -s packages) 80 180 ppm/ma dropout voltage v do 2 v quiescent current i in a, e, h grades and nongraded 1.0 1.4 ma c grade 1.0 1.6 ma load current i load sourcing a, e, h grades and nongraded 10 ma c grade 8 ma sinking ?0.3 ma short circuit to gnd i sc v o = 0 v 30 ma voltage noise e n p-p 0.1 hz to 10.0 hz (-s, -z and -p packages) 15 v p-p 0.1 hz to 10.0 hz (-j package) 20 v p-p long-term stability 3 ?v o after 1000 hours of operation 50 ppm turn-on settling time t r output settling to within 0.1% of final value 5 s temperature sensor 4 voltage output at temp pin v temp 580 mv temperature sensitivity tcv temp 1.96 mv/c 1 refer to the section. output adjustment 2 specification includes the effects of self-heating. 3 long-term stability is noncumulative; the drift in subsequent 1000-hour periods is significantl y lower than in the first 1000- hour periods. refer to application note an-713 . 4 refer to the temperature monitoring section.
REF01/ref02/ref03 rev. k | page 5 of 20 ref03 specifications v in = 15 v, ?40c t a +85c, i load = 0 ma, unless otherwise noted. parameter symbol conditions min typ max unit output voltage v o 2.495 2.500 2.515 v output adjustment range 1 v trim pot = 10 k 6 11 % initial accuracy v oerr 15 mv 0.6 % temperature coefficient tcv o 10 50 ppm/c line regulation 2 ?v o /?v in v in = 4.5 v to 33 v 20 50 ppm/v load regulation 2 ?v o /?i load i load = 0 ma to 10 ma 60 100 ppm/ma dropout voltage v do 2 v quiescent current i in 1.0 1.4 ma load current i load sourcing 10 ma sinking ?0.3 ma short circuit to gnd i sc v o = 0 v 24 ma voltage noise e n p-p 0.1 hz to 10.0 hz 6 v p-p long-term stability 3 ?v o after 1000 hours of operation 50 ppm turn-on settling time t r output settling to within 0.1% of final value 5 s temperature sensor 4 voltage output at temp pin v temp 580 mv temperature sensitivity tcv temp 1.96 mv/c 1 refer to the section. output adjustment 2 specification includes the effects of self-heating. 3 long-term stability is noncumulative; the drift in subsequent 1000-hour periods is significantl y lower than in the first 1000- hour periods. refer to application note an-713 . 4 refer to the temperature monitoring section.
REF01/ref02/ref03 rev. k | page 6 of 20 absolute maximum ratings table 2. parameter rating input voltage 36.0 v output short circuit duration indefinite operating temperature range REF01a, ref02a ?55c to +125c REF01cp, REF01cs, REF01e, REF01h, ref02cp, ref02cs, ref02e, ref02h, ref03g ?40c to +85c REF01cj 0c to +70c storage temperature range -j, -s, -z and -rc packages ?65c to +150c -p package ?65c to +125c junction temperature range (t j ) ?65c to +150c lead temperature (soldering, 10 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 the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. table 3. thermal resistance package type ja jc unit 8-lead soic (s) 130 43 c/w 8-lead pdip (p) 110 50 c/w 8-lead cerdip (z) 162 26 c/w to-99 (j) 170 24 c/w esd caution
REF01/ref02/ref03 rev. k | page 7 of 20 pin configurations and function descriptions 00375-004 REF01/ ref02/ ref03 top view (not to scale) nc 1 v in 2 temp 3 gnd 4 nc nc v out trim 8 7 6 5 figure 4. 8-lead pdip (p-suffix), 8-lead cerdip (z-suffix), 8-lead soic (s-suffix) pin configuration table 4. pin function descriptionspdip, cerdip, and soic packages pin no. mnemonic description 1, 7, 8 nc no internal connection. leave floati ng or tied to ground in actual application. 2 v in supply voltage input. 3 temp temperature (band gap) output. refer to the temperature monitoring section. 4 gnd ground connection. 5 trim output voltage trim. refer to the output adjustment section. 6 v out reference voltage output. 00375-005 1 2 3 4 5 6 7 8 nc ground (case) nc v in v out nc nc trim REF01/ ref02/ ref03 figure 5. 8-lead to-99 (j-suffix) pin configuration table 5. pin function descriptions8-lead to-99 package pin no. mnemonic description 1, 3, 7, 8 nc no internal connection. leave floating or tied to ground in actual application. 2 v in supply voltage input. 4 gnd ground connection. 5 trim output voltage trim. refer to the output adjustment section. 6 v out reference voltage output. 00375-006 4 nc 5 v in 6 nc 7 temp 8 nc 18 nc 17 nc 16 nc 15 v out 14 nc 19 nc 20 nc 1 nc 2 nc 3 nc 13 nc 12 trim 11 nc 10 gnd 9 nc REF01/ ref02 top view (not to scale) figure 6. 20-terminal lcc (rc-suffi x) pin configuration table 6. pin function descript ions20-terminal lcc package terminal no. mnemonic description 1 to4, 6, 8, 9, 11, 13, 14, 16 to 20 nc no internal connection. leave floating or tied to ground in actual application. 5 v in supply voltage input. 7 temp temperature (band gap) output. refer to the temperature monitoring section. 10 gnd ground connection. 12 trim output voltage trim. refer to the output adjustment section. 15 v out reference voltage output.
REF01/ref02/ref03 rev. k | page 8 of 20 typical performance characteristics temperature (c) v out (v) 10.010 10.005 10.000 9.995 9.990 9.985 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 00375-007 figure 7. REF01 typical output voltage vs. temperature temperature (c) v out (v) 5.008 5.004 5.000 4.996 4.992 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 00375-008 figure 8. ref02 typical output voltage vs. temperature temperature (c) ?40 v out (v) 2.502 2.501 ?25 ?10 5 20 35 50 65 80 95 110 125 2.500 2.499 2.498 00375-009 figure 9. ref03 typical output voltage vs. temperature 12 28 16 20 24 32 36 40 supply current (ma) 0.8 0.7 0.6 0.5 0.4 input voltage (v) +125c +25c ?40c 00375-010 figure 10. REF01 supply cu rrent vs. input voltage 12 28 16 20 24 32 36 40 8 supply current (ma) +125c 0.8 0.7 0.6 0.5 0.4 input voltage (v) +25c ?40c 00375-011 figure 11. ref02 supply cu rrent vs. input voltage input voltage (v) 5 supply current (ma) 10 15 20 25 30 35 40 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 +125c ?40c +25c 00375-012 figure 12. ref03 supply cu rrent vs. input voltage
REF01/ref02/ref03 rev. k | page 9 of 20 40 25 20 0 85 125 30 10 i l = 0ma to 10ma load regulation (ppm/ma) temperature (c) v in = 36v v in = 14v 50 0 ?40 ?40 ?30 ?20 ?10 00375-013 figure 13. REF01 load regulation vs. temperature 40 20 0 50 85 125 30 10 i l = 0ma to 5ma load regulation (ppm/ma) temperature (c) v in = 36v v in = 8v 25 0 ?40 ?20 ?10 00375-014 figure 14. ref02 load regulation vs. temperature load regulation (ppm/ma) 0 10 20 30 40 50 60 temperature (c) ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 v in = 36v v in = 7v i l = 0ma to 10ma 00375-015 figure 15. ref03 load regulation vs. temperature 0 ?4 2 ?2 ?6 ?8 temperature (c) line regul a tion (ppm/v) ?10 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 v in = 14v to 36v 00375-016 figure 16. REF01 line re gulation vs. temperature 4 ?4 8 0 ?8 temperature (c) line regul a tion (ppm/v) v in = 8v to 36v ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 00375-017 figure 17. ref02 line re gulation vs. temperature line regul a tion (ppm/mv) ?4 ?2 0 2 4 temperature (c) ?40 ?25 ?10 52035 50 65 80 95 110 125 v in = 5v to 36v 00375-018 figure 18. ref03 line re gulation vs. temperature
REF01/ref02/ref03 rev. k | page 10 of 20 3 1 5 2 0 4 46 02 load current (ma) 81 dropout voltage (v) ?40c +125c 0 +25c 00375-019 figure 19. REF01 dropout voltage vs. load current 46 6 0 2 0 4 2 +25c load current (ma) 8 10 ?40c +125c dropout voltage (v) 0 0375-020 figure 20. ref02 dropout voltage vs. load current 3 1 5 2 0 4 46 02 load current (ma) 81 dropout voltage (v) +125c 0 +25c ?40c 6 0 0375-021 figure 21. ref03 dropout voltage vs. load current 0 0.50 246 t a = 25c load current (ma) 8 10 quiescent current (ma) 0.55 0.60 0.65 0.70 0 0375-022 figure 22. REF01 quiescent current vs. load current 00375-023 time (1s/div) 1v/di v figure 23. ref02 typical low-frequency voltage noise (0.1 hz to 10.0 hz) 00375-024 time (1ms/div) 50v/di v figure 24. ref02 typical wideband voltage noise (10 hz to 10 khz)
REF01/ref02/ref03 rev. k | page 11 of 20 00375-025 time (2ms/div) v out 5v/div no load capacitor no input capacitor 10v 8v figure 25. ref02 line transient response 00375-026 time (1ms/div) load = 5ma v out 100mv/div v in 5v/div no load capacitor load off load on figure 26. ref02 load transient response 00375-027 time (1ms/div) load = 5ma v out 100mv/div v in 5v/div load off load on c load = 100nf figure 27. ref02 load transient response 00375-028 time (4s/div) c in = 0.01f no load capacitor v in 10v/div v out 5v/div figure 28. ref02 turn-off response 00375-029 time (4s/div) c in = 0.01f no load capacitor v in 10v/div v out 5v/div figure 29. ref02 turn-on response 00375-030 time (4s/div) c l = 0.01f no input capacitor v in 10v/div v out 5v/div figure 30. ref02 turn-off resp onse (no input capacitor)
REF01/ref02/ref03 rev. k | page 12 of 20 00375-031 time (4s/div) c l = 0.01f no input capacitor v in 10v/div v out 5v/div figure 31. ref02 turn-off resp onse (no input capacitor) 125 25 50 75 100 0.40 0.80 0.75 0.70 0.65 0.60 0.55 0.50 0.45 ?25 0 ?50 v in = 15v sample size = 5 v temp (v) temperature (c) v temp / t 1.96mv/c 00375-032 figure 32. output voltage at temp pin vs. temperature
REF01/ref02/ref03 rev. k | page 13 of 20 terminology dropout voltage (v do ) dropout voltage, sometimes referred to as supply voltage headroom or supply-output voltage differential, is defined as the minimum voltage differential between the input and output necessary for the device to operate. () constant min = ?= l out in do i vvv since the dropout voltage depends upon the current passing through the device, it is always specified for a given load current. temperature coefficient (tcv o ) the temperature coefficient relates the change in output voltage to the change in ambient temperature of the device, as normal- ized by the output voltage at 25c. this parameter is expressed in ppm/c and can be determined by the following equation: () () () () [] cppm/10 c25 6 o o ? ? = 12 out 1 out 2 out out tt v tvtv tcv where: v out (25c) is output voltage at 25c. v out (t 1 ) is output voltage at temperature 1. v out (t 2 ) is output voltage at temperature 2. thermally induced output voltage hysteresis (v out_hys ) thermally induced output voltage hysteresis represents the change in output voltage after the device is exposed to a specified temperature cycle. this may be expressed as either a shift in voltage or a difference in ppm from the nominal output. () [] v c25 _ _ tc out out hysout v v v ? = o () () [] ppm10 c25 c25 6 _ _ ? = o o out tcout out hysout v v v v where: v out (25c)is output voltage at 25c. v out_tc is output voltage after temperature cycling. thermal hysteresis occurs mainly as a result of forces exhibited upon the internal die by its packaging. the effect is more pronounced in parts with smaller packages. long-term stability (v out_ltd ) long-term stability refers to the shift in output voltage at 25c after 1000 hours of operation in a 25c environment. this may also be expressed as either a shift in voltage or a difference in ppm from the nominal output. () () [] v 0 _ tvtv v out 1 out ltdout ? = () () () [] ppm tv tvtv v out out 1 out ltdout 6 0 0 _ 10 ? = where: v out (t 0 ) is v out at 25c at time 0. v out (t 1 ) is v out at 25c after 1000 hours of operation at 25c. line regulation line regulation refers to the change in output voltage in response to a given change in input voltage. it is expressed in either percent per volt, ppm per volt, or microvolt per volt change in input voltage. this parameter accounts for the effects of self-heating. load regulation load regulation refers to the change in output voltage in response to a given change in load current, and is expressed in either microvolts per milliamp, ppm per milliamp, or ohms of dc output resistance. this parameter accounts for the effects of self-heating.
REF01/ref02/ref03 rev. k | page 14 of 20 theory of operation REF01, ref02, and ref03 are high precision, low drift 10.0 v, 5.0 v, and 2.5 v voltage references available in a variety of packages. these devices are standard band gap references (see figure 33 ). the band gap cell contains two npn transistors (q18 and q19) that differ in emitter area by a factor of 2. the difference in the v be values of these transistors produces a proportional-to-absolute temperature current (ptat) through r14, and, when combined with the v be of q19, produces a band gap voltage, v bg , that is almost constant over temperature. with an internal op amp and the feedback network created by r5 and r6, v o is set precisely at 10.0 v, 5.0 v, or 2.5 v. precision laser trimming of various resistors and other proprietary circuit techniques are used to further enhance the initial accuracy, temperature curvature, and drift performance of the device. the ptat voltage is brought out directly from the band gap, unbuffered, at the temp pin. since this voltage output has a stable 1.96 mv/c temperature coefficient, users can estimate the temperature change of the device by simply monitoring the change in voltage at this pin. r1 r2 r3 r4 v in q23 q1 q2 q7 q8 q9 q3 q10 d1 d2 q4 v o d3 c1 r13 q12 q13 r5 i1 r12 q14 q15 2 1 v bg r20 trim q18 temp r27 q19 q16 q17 q20 r6 r42 r41 r24 r32 r11 r17 r14 gnd 00375-033 figure 33. ref0x si mplified schematic input and output capacitors figure 34 shows the basic input/output capacitor configuration for the ref0x series of references. u1 REF01/ ref02/ ref03 v o c2 0.1f c1 0.1f v in v in v out temp trim gnd 00375-034 figure 34. basic ref0x capacitor configuration while the ref0x series of references are designed to function stably without any external components, connecting a 0.1 f ceramic capacitor to the output is highly recommended to improve stability and filter out low level voltage noise. an additional 1 f to 10 f electrolytic, tantalum, or ceramic capacitor can be added in parallel to improve transient perfor- mance in response to sudden changes in load current; however, the designer should keep in mind that doing so increases the turn-on time of the device. a 1 f to 10 f electrolytic, tantalum, or ceramic capacitor can also be connected to the input to improve transient response in applications where the supply voltage may fluctuate. an additional 0.1 f ceramic capacitor should be connected in parallel to reduce supply noise. both input and output capacitors should be mounted as close to the device pins as possible. output adjustment the ref0x trim terminal can be used to adjust the output up or down from the internally trimmed, nominal output voltage. this feature allows the system designer to trim out system errors due to changes in line and load conditions, thermal hysteresis, output offset due to solder reflow, or other error sources. the basic trim circuit configuration is shown in figure 35 . table 7 also lists the range of output voltages obtainable from each model in this configuration. u1 REF01/ ref02/ ref03 v in v out temp trim gnd v in v o pot 10k ? r2 1k? r1 470k? 00375-035 figure 35. optional trim adjustment circuit table 7. adjustment range using trim circuit model v out , low limit v out , high limit REF01 9.70 v 10.05 v ref02 4.95 v 5.02 v ref03 2.3 v 2.8 v adjustment of the output does not significantly affect the temperature performance of the reference itself, provided the temperature coefficients of the resistors used are low.
REF01/ref02/ref03 rev. k | page 15 of 20 temperature monitoring in addition to the optional trim function, the ref0x series of references provides the ability to monitor changes in temper- ature by way of tracking the voltage present at the temp pin. the output voltage of this pin is taken directly from the band gap core and, as a result, varies linearly with temperature. the nominal voltage at the temp pin (v temp ) is approximately 550 mv at 25c, with a temperature coefficient (tcv temp ) of approximately 1.96 mv/c. refer to figure 32 for a graph of output voltage vs. temperature. as an example, given these ideal values, a voltage change of 39.2 mv at the temp pin corresponds to a 20c change in temperature. the temp function is provided as a convenience, rather than a precise feature, of the reference. in addition, because the voltage at the temp pin is taken directly from the band gap core, any current injected into or pulled from this pin has a significant effect on v out . as such, even tens of microamps drawn from the temp pin can cause the output to fall out of regulation. should the designer wish to take advantage of this feature, it is neces- sary to buffer the output of the temp pin with a low bias current op amp, such as the ad8601 or ad8641. any of these op amps, if used as shown in figure 36 , causes less than a 100 v change in v out . u2 15v u1 v in v out temp trim gnd v o v? v+ ad8641 v temp 1.9mv/c v in 00375-036 REF01/ ref02/ ref03 figure 36. temperature monitoring long-term stability one of the key parameters of the ref0x series of references is long-term stability. regardless of output voltage, internal testing during development showed a typical drift of approximately 50 ppm after 1,000 hours of continuous, nonloaded operation in a +25c environment. it is important to understand that long-term stability is not guaranteed by design, and that the output from the device may shift beyond the typical 50 ppm specification at any time, especially during the first 200 hours of operation. for systems that require highly stable output over long periods of time, the designer should consider burning-in the devices prior to use to minimize the amount of output drift exhibited by the reference over time. refer to the an-713 application note for more information regarding the effects of long-term drift and how it can be minimized. burn-in burn-in, wherein the part is powered and allowed to operate normally for an extended period of time, can be useful for minimizing the effects of long-term drift. a sample burn-in circuit is shown below in figure 37 . 00375-037 v in v out gnd +18 v ?18v + 10f + 10f 10? r l optional REF01/ ref02/ ref03 figure 37. burn-in circuit the part may be burned in with or without a constant resistive load. the load current should not exceed 10 ma. power dissipation the ref0x series of voltage references are capable of sourcing up to 10 ma of load current at room temperature across the rated input voltage range. however, when used in applications subject to high ambient temperatures, the input voltage and load current should be carefully monitored to ensure that the device does not exceeded its maximum power dissipation rating. the maximum power dissipation of the device can be calculated via the following equation: [] w ja a j d tt p ? = where: p d is device power dissipation. t j is device junction temperature. t a is ambient temperature. ja is package (junction-to-air) thermal resistance. because of this relationship, acceptable load current in high- temperature conditions may be less than the maximum current-sourcing capability of the device. in no case should the part be operated outside of its maximum power rating as doing so may result in premature failure or permanent damage to the device.
REF01/ref02/ref03 rev. k | page 16 of 20 applications information basic reference application figure 38 shows the basic configuration for any ref0x device. input and output capacitance values can be tailored for performance, provided they follow the guidelines described in the input and output capacitors section. u1 REF01/ ref02/ ref03 v o c2 0.1f c1 0.1f v in v in v out temp trim gnd 00375-038 figure 38. basic reference application low cost current source unlike most references, the quiescent current of the ref0x series remains constant with respect to the load current (refer to figure 22 ) . as a result, a simple, low cost current source can be constructed by configuring the reference as shown in figure 39 . REF01/ ref02/ ref03 v out gnd v in i in i set = (v out ? v l )/r set r set i q 0.6ma i l = i set + i q v l r l 00375-040 figure 39. simple current source in this configuration, the current through the resistor r set (i set ) is equal to (v out ? v l )/r set . i l is simply the sum of i set and i q . however, since i q typically varies from 0.55 ma to 0.65 ma, this circuit should be limited to low precision, general-purpose applications. precision current source with adjustable output a higher-precision current source can be implemented with the circuit shown in figure 40 . u2 +12v ?12v w b a u1 ref02 v in v out temp trim gnd v? v+ op1177 ?5v to v l ad5201 0v to (5v + v l ) +12 v r set 1k? r l i l v l 1k ? 100k ? 00375-041 figure 40. programmable 0 ma to 5 ma current source by adding a mechanical or digital potentiometer, this circuit becomes an adjustable current source. if a digital potentiometer is used, the load current is simply the voltage across terminal b to terminal w of the digital potentiometer divided by the value of the resistor r set . a set ref l r d v i where d is the decimal equivalent of the digital potentiometer input code. a dual-supply op amp should be used since the ground potential of ref02 can swing from ?5.0 v to v l while the potentiometer is swung from zero-scale to full-scale. precision boosted output regulator the output current sourcing capability of the ref0x series can be boosted by using an external op amp and mosfet, as shown in figure 41 . u2 15v n1 200 ? u1 REF01/ ref02/ ref03 v in v out temp trim gnd v? v+ op1177 2n7002 v in v o r l 1f c l 00375-042 c 1 1000pf r 2 100 ? r 1 100 ? figure 41. precision boosted output regulator in this circuit, u2 forces v o to v ref by regulating the current through n1, thereby sourcing the load current directly from the input voltage source connected at v in . using the components shown, this circuit can source up to 50 ma with an input volt- age of 15.0 v. the circuits current sourcing capability can be further increased by replacing n1 with a higher-power mosfet.
REF01/ref02/ref03 rev. k | page 17 of 20 bipolar voltage reference many applications require both a positive and reference voltage of the same magnitude. a simple method of generating such a bipolar reference is shown in figure 42 . 00375-043 ref03 v in gnd v + v? 2 3 4 6 7 2 u1 u2 4 6 v out op97 100k ? ?2.5v +2.5v 100k ? figure 42. bipolar voltage reference in this configuration, the negative rail is generated simply with an inverting amplifier with a gain of ?1. a low offset op amp should be used to minimize the voltage error at the negative output. adjustable reference with positive and negative swing the output voltage of the ref0x references can be readily adjusted via a simple trim circuit (explained in the output adjustment section). the circuit shown in figure 43 extends the negative range of adjustment beyond that obtainable with the simple trim circuit by employing a precision op amp with a potentiometer feeding the op amps noninverting input. 00375-044 ref03 v in gnd v + v+ 2 3 4 6 7 +15v 50k ? 2 u1 u2 4 6 v out op97 50k? 50k? v out ?2.5v to +2.5v figure 43. negatively adjustable reference the voltage output from the op amp can be adjusted by changing the value of the potentiometer: as shown, the op amp outputs +2.5 v when the pot is pulled completely high, and ?2.5v when pulled completely low. in this configuration, the load current is sourced by the op amp; therefore, a low offset op amp with a current rating that meets or exceeds the current requirements of the load should be used.
REF01/ref02/ref03 rev. k | page 18 of 20 outline dimensions 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. 0.310 (7.87) 0.220 (5.59) 0.005 (0.13) min 0.055 (1.40) max 0.100 (2.54) bsc 15 0 0.320 (8.13) 0.290 (7.37) 0.015 (0.38) 0.008 (0.20) seating plane 0.200 (5.08) max 0.405 (10.29) max 0.150 (3.81) min 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36) 0.070 (1.78) 0.030 (0.76) 0.060 (1.52) 0.015 (0.38) 14 5 8 figure 44. 8-lead ceramic dual in-line package [cerdip] z-suffix (q-8) dimensions shown in inches and (millimeters) . 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. compliant to jedec standards mo-002-ak 0.2500 (6.35) min 0.5000 (12.70) min 0.1850 (4.70) 0.1650 (4.19) reference plane 0.0500 (1.27) max 0.0190 (0.48) 0.0160 (0.41) 0.0210 (0.53) 0.0160 (0.41) 0.0400 (1.02) 0.0100 (0.25) 0.0400 (1.02) max 0.0340 (0.86) 0.0280 (0.71) 0.0450 (1.14) 0.0270 (0.69) 0.1600 (4.06) 0.1400 (3.56) 0.1000 (2.54) bsc 6 2 8 7 5 4 3 1 0.2000 (5.08) bsc 0.1000 (2.54) bsc 0.3700 (9.40) 0.3350 (8.51) 0.3350 (8.51) 0.3050 (7.75) 45 bsc base & seating plane 022306-a figure 45. 8-pin metal header package [to-99] j-suffix (h-08) dimensions shown in inches and (millimeters)
REF01/ref02/ref03 rev. k | page 19 of 20 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) seating plane 0.015 (0.38) min 0.210 (5.33) max 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) 8 1 4 5 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 0.100 (2.54) bsc 0.400 (10.16) 0.365 (9.27) 0.355 (9.02) 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) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.015 (0.38) gauge plane 0.005 (0.13) min figure 46. 8-lead plastic dual in-line package [pdip] narrow body, p-suffix (n-8) dimensions shown in inches and (millimeters) 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. 1 20 4 9 8 13 19 14 3 18 bottom view 0.028 (0.71) 0.022 (0.56) 45 typ 0.015 (0.38) min 0.055 (1.40) 0.045 (1.14) 0.050 (1.27) bsc 0.075 (1.91) ref 0.011 (0.28) 0.007 (0.18) r typ 0.095 (2.41) 0.075 (1.90) 0.100 (2.54) ref 0.200 (5.08) ref 0.150 (3.81) bsc 0.075 (1.91) ref 0.358 (9.09) 0.342 (8.69) sq 0.358 (9.09) max sq 0.100 (2.54) 0.064 (1.63) 0.088 (2.24) 0.054 (1.37) 022106-a figure 47. 20-terminal ceramic leadless chip carrier [lcc] rc-suffix (e-20-1) 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-012-a a 012407-a 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 4 1 85 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) bsc 6.20 (0.2441) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarity 0.10 figure 48. 8-lead standard small outline package [soic_n] narrow body, s-suffix (r-8) dimensions shown in millimeters and (inches)
REF01/ref02/ref03 rev. k | page 20 of 20 REF01 ordering guide model 1 , 2 initial accuracy (mv) temperature range package description package option REF01aj/883c 30 ?55c to +125c 8-pin to-99 j-suffix (h-08) REF01cj 100 0c to 70c 8-pin to-99 j-suffix (h-08) REF01ez 30 ?40c to +85c 8-lead cerdip z-suffix (q-8) REF01hz 50 ?40c to +85c 8-lead cerdip z-suffix (q-8) REF01cpz 100 ?40c to +85c 8-lead pdip p-suffix (n-8) REF01hpz 50 ?40c to +85c 8-lead pdip p-suffix (n-8) REF01cs 100 ?40c to +85c 8-lead soic_n s-suffix (r-8) REF01cs-reel 100 ?40c to +85c 8-lead soic_n s-suffix (r-8) REF01cs-reel7 100 ?40c to +85c 8-lead soic_n s-suffix (r-8) REF01csz 100 ?40c to +85c 8-lead soic_n s-suffix (r-8) REF01csz-reel 100 ?40c to +85c 8-lead soic_n s-suffix (r-8) REF01csz-reel7 100 ?40c to +85c 8-lead soic_n s-suffix (r-8) 1 contact sales for 883 data sheet. 2 z = rohs compliant part. ref02 ordering guide model 1 , 2 initial accuracy (mv) temperature range package description package option ref02aj/883c 15 ?55c to +125c 8-pin to-99 j-suffix (h-08) ref02az 15 ?55c to +125c 8-lead cerdip z-suffix (q-8) ref02az/883c 15 ?55c to +125c 8-lead cerdip z-suffix (q-8) ref02cp 50 ?40c to +85c 8-lead pdip p-suffix (n-8) ref02cpz 50 ?40c to +85c 8-lead pdip p-suffix (n-8) ref02cs 50 ?40c to +85c 8-lead soic_n s-suffix (r-8) ref02cs-reel 50 ?40c to +85c 8-lead soic_n s-suffix (r-8) ref02cs-reel7 50 ?40c to +85c 8-lead soic_n s-suffix (r-8) ref02csz 50 ?40c to +85c 8-lead soic_n s-suffix (r-8) ref02csz-reel 50 ?40c to +85c 8-lead soic_n s-suffix (r-8) ref02csz-reel7 50 ?40c to +85c 8-lead soic_n s-suffix (r-8) ref02ez 15 ?40c to +85c 8-lead cerdip z-suffix (q-8) ref02hz 25 ?40c to +85c 8-lead cerdip z-suffix (q-8) ref02hpz 25 ?40c to +85c 8-lead pdip p-suffix (n-8) ref02hsz 25 ?40c to +85c 8-lead soic_n s-suffix (r-8) ref02rc/883 25 ?55c to +125c 20-terminal lcc rc-suffix (e-20-1) ref02z 25 ?55c to +125c 8-lead cerdip z-suffix (q-8) 1 contact sales for 883 data sheet. 2 z = rohs compliant part. ref03 ordering guide model 1 initial accuracy (mv) temperature range package description package option ref03gpz 15 ?40c to +85c 8-lead pdip n-8 (p-suffix) ref03gsz 15 ?40c to +85c 8- lead soic_n r-8 (p-suffix) ref03gsz-reel 15 ?40c to +85c 8-lead soic_n r-8 (p-suffix) ref03gsz-reel7 15 ?40c to +85c 8-lead soic_n r-8 (p-suffix) 1 z = rohs compliant part. ?2000C2010 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d00375-0-10/10(k)

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