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low power, low noise voltage references with sink/source capability adr360/adr361/adr363/adr364/adr365/adr366 rev. a 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 ?2006 analog devices, inc. all rights reserved. features compact tsot-23-5 packages low temperature coefficient b grade: 9 ppm/c a grade: 25 ppm/c initial accuracy b grade: 3 mv maximum a grade: 6 mv maximum ultralow output noise: 6.8 v p-p (0.1 hz to 10 hz) low dropout: 300 mv low supply current: 190 a maximum no external capacitor required output current: +5 ma/?1 ma wide temperature range: ?40c to +125c applications battery-powered instrumentations portable medical instrumentations data acquisition systems industrial process controls automotive pin configuration 05467-001 nc 1 g nd 2 v in 3 trim 5 v out 4 adr36x top view (not to scale) nc = no connect figure 1. 5-lead tsot (uj suffix) table 1. model v out (v) 1 temperature coefficient (ppm/c) accuracy (mv) adr360b 2.048 9 3 adr360a 2.048 25 6 adr361b 2.5 9 3 adr361a 2.5 25 6 adr363b 3.0 9 3 adr363a 3.0 25 6 adr364b 4.096 9 4 adr364a 4.096 25 8 adr365b 5.0 9 4 ADR365A 5.0 25 8 adr366b 3.3 9 4 adr366a 3.3 25 8 1 contact analog devices, inc. for other voltage options. general description the adr360/adr361/adr363/adr364/adr365/adr366 are precision 2.048 v, 2.5 v, 3.0 v, 4.096 v, 5.0 v, and 3.3 v band gap voltage references that feature low power, high precision in tiny footprints. using analog devices patented temperature drift curvature correction techniques, the adr36x references achieve a low temperature drift of 9 ppm/c in the tsot package. the adr36x family of micropower, low dropout voltage references provides a stable output voltage from a minimum supply of 300 mv above the output. their advanced design eliminates the need for external capacitors, which further reduces board space and system cost. the combination of low power operation, small size, and ease of use makes the adr36x precision voltage references ideally suited for battery-operated applications.
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 2 of 20 table of contents features .............................................................................................. 1 applications....................................................................................... 1 pin configuration............................................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 adr360specifications ................................................................. 3 adr361specifications ................................................................. 4 adr363specifications ................................................................. 5 adr364specifications ................................................................. 6 adr365specifications ................................................................. 7 adr366specifications ................................................................. 8 absolute maximum ratings............................................................ 9 thermal resistance .......................................................................9 esd caution...................................................................................9 terminology .................................................................................... 10 typical performance characteristics ........................................... 11 theory of operation ...................................................................... 16 device power dissipation considerations.............................. 16 input capacitor........................................................................... 16 output capacitor........................................................................ 16 applications..................................................................................... 17 basic voltage reference connection ....................................... 17 outline dimensions ....................................................................... 19 ordering guide .......................................................................... 19 revision history 3/06rev. 0 to rev. a changes to figure 15 caption....................................................... 13 changes to figure 21 caption....................................................... 14 changes to theory of operatio n section.....................................16 changes to figure 36.......................................................................18 4/05revision 0: initial version
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 3 of 20 adr360specifications electrical characteristics (v in = 2.35 v to 15 v, t a = 25c, unless otherwise noted.) table 2. parameter symbol conditions min typ max unit output voltage v o a grade 2.042 2.048 2.054 v b grade 2.045 2.048 2.051 v initial accuracy v oerr a grade 6 mv a grade 0.29 % b grade 3 mv b grade 0.15 % a grade, ?40c < t a < +125c 25 ppm/c temperature coefficient tcv o b grade, ?40c < t a < +125c 9 ppm/c supply voltage headroom v in ? v o 300 mv line regulation ?v o /?v in v in = 2.45 v to 15 v, ?40c < t a < +125c 0.105 mv/v i load = 0 ma to 5 ma, ?40c < t a < +125c, v in = 3 v 0.37 mv/ma load regulation ?v o /?i load i load = ?1 ma to 0 ma, ?40c < t a < +125c, v in = 3 v 0.82 mv/ma quiescent current i in ?40c < t a < +125c 150 190 a voltage noise e n p-p 0.1 hz to 10 hz 6.8 v p-p turn-on settling time t r 25 s long-term stability 1 ?v o 1,000 hours 50 ppm output voltage hysteresis ?v o_hys 100 ppm ripple rejection ratio rrr f in = 60 khz 70 db v in = 5 v 25 ma short circuit to gnd i sc v in = 15 v 30 ma 1 the long-term stability specification is noncumulative. the drift subsequent 1,000 hour pe riods are signific antly lower than i n the first 1,000 hour period.
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 4 of 20 adr361specifications electrical characteristics (v in = 2.8 v to 15 v, t a = 25c, unless otherwise noted.) table 3. parameter symbol conditions min typ max unit output voltage v o a grade 2.494 2.500 2.506 v b grade 2.497 2.500 2.503 v initial accuracy v oerr a grade 6 mv a grade 0.24 % b grade 3 mv b grade 0.12 % a grade, ?40c < t a < +125c 25 ppm/c temperature coefficient tcv o b grade, ?40c < t a < +125c 9 ppm/c supply voltage headroom v in ? v o 300 mv line regulation ?v o /?v in v in = 2.8 v to 15 v, ?40c < t a < +125c 0.125 mv/v i load = 0 ma to 5 ma, ?40c < t a < +125c, v in = 3.5 v 0.45 mv/ma load regulation ?v o /?i load i load = ?1 ma to 0 ma, ?40c < t a < +125c, v in = 3.5 v 1 mv/ma quiescent current i in ?40c < t a < +125c 150 190 a voltage noise e n p-p 0.1 hz to 10 hz 8.25 v p-p turn-on settling time t r 25 s long-term stability 1 ?v o 1,000 hours 50 ppm output voltage hysteresis ?v o_hys 100 ppm ripple rejection ratio rrr f in = 60 khz 70 db v in = 5 v 25 ma short circuit to gnd i sc v in = 15 v 30 ma 1 the long-term stability specification is noncumulative. the drift subsequent 1,000 hour pe riods are signific antly lower than i n the first 1,000 hour period.
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 5 of 20 adr363specifications electrical characteristics (v in = 3.3 v to 15 v, t a = 25c, unless otherwise noted.) table 4. parameter symbol conditions min typ max unit output voltage v o a grade 2.994 3.000 3.006 v b grade 2.997 3.000 3.003 v initial accuracy v oerr a grade 6 mv a grade 0.2 % b grade 3 mv b grade 0.1 % a grade, ?40c < t a < +125c 25 ppm/c temperature coefficient tcv o b grade, ?40c < t a < +125c 9 ppm/c supply voltage headroom v in ? v o 300 mv line regulation ?v o /?v in v in = 3.3 v to 15 v, ?40c < t a < +125c 0.15 mv/v i load = 0 ma to 5 ma, ?40c < t a < +125c, v in = 4 v 0.54 mv/ma load regulation ?v o /?i load i load = ?1 ma to 0 ma, ?40c < t a < +125c, v in = 4 v 1.2 mv/ma quiescent current i in ?40c < t a < +125c 150 190 a voltage noise e n p-p 0.1 hz to 10 hz 8.7 v p-p turn-on settling time t r 25 s long-term stability 1 ?v o 1,000 hours 50 ppm output voltage hysteresis ?v o_hys 100 ppm ripple rejection ratio rrr f in = 60 khz 70 db v in = 5 v 25 ma short circuit to gnd i sc v in = 15 v 30 ma 1 the long-term stability specification is noncumulative. the drift subsequent 1,000 hour pe riods are signific antly lower than i n the first 1,000 hour period.
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 6 of 20 adr364specifications electrical characteristics (v in = 4.4 v to 15 v, t a = 25c, unless otherwise noted.) table 5. parameter symbol conditions min typ max unit output voltage v o a grade 4.088 4.096 4.104 v b grade 4.092 4.096 4.100 v initial accuracy v oerr a grade 8 mv a grade 0.2 % b grade 4 mv b grade 0.1 % a grade, ?40c < t a < +125c 25 ppm/c temperature coefficient tcv o b grade, ?40c < t a < +125c 9 ppm/c supply voltage headroom v in ? v o 300 mv line regulation ?v o /?v in v in = 4.4 v to 15 v, ?40c < t a < +125c 0.205 mv/v i load = 0 ma to 5 ma, ?40c < t a < +125c, v in = 5 v 0.735 mv/ma load regulation ?v o /?i load i load = ?1 ma to 0 ma, ?40c < t a < +125c, v in = 5 v 1.75 mv/ma quiescent current i in ?40c < t a < +125c 150 190 a voltage noise e n p-p 0.1 hz to 10 hz 11 v p-p turn-on settling time t r 25 s long-term stability 1 ?v o 1,000 hours 50 ppm output voltage hysteresis ?v o_hys 100 ppm ripple rejection ratio rrr f in = 60 khz 70 db v in = 5 v 25 ma short circuit to gnd i sc v in = 15 v 30 ma 1 the long-term stability specification is noncumulative. the drift subsequent 1,000 hour pe riods are signific antly lower than i n the first 1,000 hour period.
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 7 of 20 adr365specifications electrical characteristics (v in = 5.3 v to 15 v, t a = 25c, unless otherwise noted.) table 6. parameter symbol conditions min typ max unit output voltage v o a grade 4.992 5.000 5.008 v b grade 4.996 5.000 5.004 v initial accuracy v oerr a grade 8 mv a grade 0.16 % b grade 4 mv b grade 0.08 % a grade, ?40c < t a < +125c 25 ppm/c temperature coefficient tcv o b grade, ?40c < t a < +125c 9 ppm/c supply voltage headroom v in ? v o 300 mv line regulation ?v o /?v in v in = 5.3 v to 15 v, ?40c < t a < +125c 0.25 mv/v i load = 0 ma to 5 ma, ?40c < t a < +125c, v in = 6v 0.9 mv/ma load regulation ?v o /?i load i load = ?1 ma to 0 ma, ?40c < t a < +125c, v in = 6 v 2 mv/ma quiescent current i in ?40c < t a < +125c 150 190 a voltage noise e n p-p 0.1 hz to 10 hz 12.8 v p-p turn-on settling time t r 20 s long-term stability 1 ?v o 1,000 hours 50 ppm output voltage hysteresis ?v o_hys 100 ppm ripple rejection ratio rrr f in = 60 khz 70 db v in = 5 v 25 ma short circuit to gnd i sc v in = 15 v 30 ma 1 the long-term stability specification is noncumulative. the drift subsequent 1,000 hour pe riods are signific antly lower than i n the first 1,000 hour period.
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 8 of 20 adr366specifications electrical characteristics (v in = 3.6 v to 15 v, t a = 25c, unless otherwise noted.) table 7. parameter symbol conditions min typ max unit output voltage v o a grade 3.292 3.300 3.308 v b grade 3.296 3.300 3.304 v initial accuracy v oerr a grade 8 mv a grade 0.25 % b grade 4 mv b grade 0.125 % a grade, ?40c < t a < +125c 25 ppm/c temperature coefficient tcv o b grade, ?40c < t a < +125c 9 ppm/c supply voltage headroom v in ? v o 300 mv line regulation ?v o /?v in v in = 3.6 v to 15 v, ?40c < t a < +125c 0.165 mv/v i load = 0 ma to 5 ma, ?40c < t a < +125c, v in = 4.2 v 0.6 mv/ma load regulation ?v o /?i load i load = ?1 ma to 0 ma, ?40c < t a < +125c, v in = 4.2 v 1.35 mv/ma quiescent current i in ?40c < t a < +125c 150 190 a voltage noise e n p-p 0.1 hz to 10 hz 9.3 v p-p turn-on settling time t r 25 s long-term stability 1 ?v o 1,000 hours 50 ppm output voltage hysteresis ?v o_hys 100 ppm ripple rejection ratio rrr f in = 60 khz 70 db v in = 5 v 25 ma short circuit to gnd i sc v in = 15 v 30 ma 1 the long-term stability specification is noncumulative. the drift subsequent 1,000 hour pe riods are signific antly lower than i n the first 1,000 hour period.
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 9 of 20 absolute maximum ratings t a = 25c, unless otherwise noted. table 8. parameter rating supply voltage 18 v output short-circuit duration to gnd v in < 15 v indefinite v in > 15 v 10 sec storage temperature range ?65c to +125c operating temperature range ?40c to +125c junction temperature range ?65c to +125c lead temperature (soldering, 60 sec) 300c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. thermal resistance ja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. table 9. thermal resistance package type ja jc unit tsot-23-5 (uj-5) 230 146 c/w esd caution esd (electrostatic discharge) sensitive device. electrosta tic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge without detection. although this product features proprietary esd protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality.
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 10 of 20 terminology temperature coefficient the change of output voltage with respect to operating temperature changes normalized by the output voltage at 25c. this parameter is expressed in ppm/c and can be determined by ( ) ( ) () () 6 12 1 2 o 10 c25 c]ppm/[ ? ? = tt v tvtv tcv o o o where: v o (25c) = v o at 25c. v o ( t 1 ) = v o at temperature 1. v o ( t 2 ) = v o at temperature 2. line regulation the change in output voltage due to a specified change in input voltage. this parameter accounts for the effects of self-heating. line regulation is expressed in either percent per volt, parts- per-million per volt, or microvolts per volt change in input voltage. load regulation the change in output voltage due to a specified change in load current. this parameter accounts for the effects of self-heating. load regulation is expressed in either microvolts per milliampere, parts-per-million per milliampere, or ohms of dc output resistance. long-term stability typical shift of output voltage at 25c on a sample of parts subjected to a test of 1,000 hours at 25c. ( ) ( ) 1 0 tvtvv o oo ? = [] ( ) ( ) () ? ? ? ? ? ? ? ? = 6 0 1 0 10 ppm tv tCvtv v o o o o where: v o ( t 0 ) = v o at 25c at time 0. v o ( t 1 ) = v o at 25c after 1,000 hours operation at 25c. thermal hysteresis the change of output voltage after the device is cycled through temperature from +25c to C40c to +125c and back to +25c. this is a typical value from a sample of parts put through such a cycle. ( ) tco o hyso v vv _ _ c25 ? = [] ( ) () 6 _ _ 10 c25 c25 ppm ? = o tco o hyso v v v v where: v o (25c) = v o at 25c. v o_tc = v o at 25c after temperature cycle at +25c to C40c to +125c and back to +25c.
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 11 of 20 typical performance characteristics 2.052 2.044 ?40 05467-002 temperature ( c) v out (v) 2.050 2.048 2.046 ?20 0 20 40 60 80 100 120 figure 2. adr360 output voltage vs. temperature 2.504 2.494 ?40 05467-003 temperature ( c) v out (v) 125 2.502 2.500 2.498 2.496 ?25?105 203550658095110 figure 3. adr361 output voltage vs. temperature 3.003 2.996 ?40 05467-004 temperature ( c) v out (v) ?20 0 20 40 60 80 100 120 3.002 3.001 3.000 2.999 2.998 2.997 figure 4. adr363 output voltage vs. temperature 4.998 4.990 ?40 05467-005 temperature ( c) v out (v) 125 4.997 4.996 4.995 4.994 4.993 4.992 4.991 ?25?105 203550658095110 figure 5. adr365 output voltage vs. temperature 0.165 0.115 2.8 05467-006 v in (v) idd (ma) 0.155 0.145 0.135 0.125 4.1 5.3 6.6 7.8 9.1 10.3 11.6 12.8 14.1 +125 c +25 c ? 40 c figure 6. adr361 supply current vs. input voltage 0.17 0.14 5.3 05467-007 v in (v) idd (ma) 0.16 0.15 6.3 7.3 8.3 9.3 10.3 11.3 12.3 13.3 14.3 +125 c +25 c ?40 c figure 7. adr365 supply current vs. input voltage
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 12 of 20 0.18 0 ?40 125 05467-036 temperature ( c) load regulation (mv/ma) 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 ?25?105 203550658095110 v in = 9v v in = 3.5v figure 8. adr361 load regulation vs. temperature 0.14 0 ?40 125 05467-037 temperature ( c) load regulation (mv/ma) ?25?105 203550658095110 0.12 0.10 0.08 0.06 0.04 0.02 v in = 9v v in = 6v figure 9. adr365 load regulation vs. temperature 25 0 ?40 05467-008 temperature ( c) line regulation (ppm/v) ?20 0 20 40 60 80 100 120 20 15 10 5 figure 10. adr360 line regulation vs. temperature, v in = 2.45 v to 15 v 9 0 ?40 05467-009 temperature ( c) line regulation (ppm/v) 125 ?25?105 203550658095110 8 7 6 5 4 3 2 1 figure 11. adr361 line regulation vs. temperature, v in = 2.8 v to 15 v 12 0 ?40 05467-010 temperature ( c) line regulation (ppm/v) ?20 0 20 40 60 80 100 120 10 8 6 4 2 figure 12. adr365 line regulation vs. temperature, v in = 5.3 v to 15 v 1.6 0 ?2 05467-011 load current (ma) differential voltage (v) 10 1.4 1.2 1.0 0.8 0.6 0.4 0.2 02468 +125 c +25 c ?40 c figure 13. adr361 minimum input voltage vs. load current
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 13 of 20 1.8 0 ?2 05467-012 load current (ma) differential voltage (v) 10 02468 +125 c ?40 c +25 c 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 figure 14. adr365 minimum input voltage vs. load current xx xx 05467-013 xx 2 v/div time = 1s/div figure 15. adr361 0.1 hz to 10 hz noise xx xx 05467-014 xx 50 v/div time = 1s/div figure 16. adr361 10 hz to 10 khz noise xx xx 05467-015 xx time = 1s/div 2 v/div figure 17. adr363 0.1 hz to 10 khz noise xx xx 05467-016 xx 50 v/div time = 1s/div figure 18. adr363 10 hz to 10 khz noise xx xx 05467-017 xx 2 v/div time = 1s/div figure 19. adr365 0.1 hz to 10 hz noise
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 14 of 20 xx xx 05467-018 xx 100 v/div time = 1s/div figure 20. adr365 10 hz to 10 khz noise 50 0 100 100k 05467-031 frequency (hz) output impedance ( ) 45 40 35 30 25 20 15 10 5 1k 10k figure 21. output impedance vs. frequency 10 ?90 1m 05467-030 frequency (hz) ripple rejection (db) 0 ?10 ?20 ?30 ?40 ?50 ?60 ?70 ?80 100 1k 10k 100k figure 22. ripple rejection ratio xx xx 05467-019 xx v out v in 500mv/div 500mv/div 4 s/div figure 23. adr361 line transient response (increasing), no capacitors xx xx 05467-020 xx v out v in 500mv/div 500mv/div 10 s/div figure 24. adr361 line transient re sponse (decreasing), no capacitors xx xx 05467-021 xx v out v in 20mv/div 500mv/div 100 s/div figure 25. adr361 line transient response, 0.1 f input capacitor
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 15 of 20 xx xx 05467-032 xx 2ms/div 100mv/div load on load off v out figure 26. adr361 load transient response xx xx 05467-033 xx 100mv/div load on v out 100 s/div figure 27. adr361 load transient response, 0.1 f input, output capacitor xx xx 05467-022 xx 5v/div input output 10 s/div 2.5v/div figure 28. adr361 turn-on response time at 5 v xx xx 05467-023 xx 400ns/div output input 5v/div 2.5v/div figure 29. adr361 turn-off response at 5 v xx xx 05467-034 xx 5v/div 2v/div 100 s/div v out v in figure 30. adr361 turn-on response, 0.1 f output capacitor xx xx 05467-035 xx 2v/div 5v/div v in v out 2ms/div figure 31. adr361 turn-off response, 0.1 f output capacitor
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 16 of 20 theory of operation band gap references are the high performance solution for low supply voltage and low power voltage reference applications, and the adr36x family is no exception. the uniqueness of these products lies in their architecture. the ideal zero tc band gap voltage is referenced to the output not to ground (see figure 32 ). therefore, if noise exists on the ground line, it is greatly attenuated on v out . the band gap cell consists of the pnp pair q53 and q52 running at unequal current densities. the difference in v be results in a voltage with a positive tc, which is amplified by a ratio of r54 r59 2 this ptat voltage, combined with the v be s of q53 and q52, produces the stable band gap voltage. reduction in the band gap curvature is performed by the ratio of resistor r44 and resistor r59, one of which is linearly temperature dependent. precision laser trimming and other patented circuit techniques are used to further enhance the drift performance. r60 q53 r54 r61 r53 q52 r58 r59 r44 r50 30k ? q2 05467-024 r101 q61 r100 q60 q1 r48 r49 62k ? v out (force) v out (sense) trim figure 32. simpli fied schematic device power dissipation considerations the adr36x family is capable of delivering load currents to 5 ma with an input voltage ranging from 2.348 v (adr360 only) to 18 v. when this device is used in applications with large input voltages, care should be taken to avoid exceeding the specified maximum power dissipation or junction temperature because it could result in premature device failure. use the following formula to calculate a devices maximum junction temperature or dissipation: ja a j d tt p ? = in this equation, t j and t a are, respectively, the junction and ambient temperatures, p d is the device power dissipation, and ja is the device package thermal resistance. input capacitor input capacitors are not required on the adr36x. there is no limit for the value of the capacitor used on the input, but a 1 f to 10 f capacitor on the input improves transient response in applications where the supply suddenly changes. an additional 0.1 f capacitor in parallel also helps reduce noise from the supply. output capacitor the adr36x does not require output capacitors for stability under any load condition. an output capacitor, typically 0.1 f, filters out any low level noise voltage and does not affect the operation of the part. on the other hand, the load transient response can improve with an additional 1 f to 10 f output capacitor in parallel. a capacitor here acts as a source of stored energy for a sudden increase in load current. the only parameter that degrades by adding an output capacitor is the turn-on time. the degradation depends on the size of the capacitor chosen.
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 17 of 20 applications basic voltage reference connection the circuit in figure 33 illustrates the basic configuration for the adr36x family. decoupling capacitors are not required for circuit stability. the adr36x family is capable of driving capacitive loads from 0 f to 10 f. however, a 0.1 f ceramic output capacitor is recommended to absorb and deliver the charge as is required by a dynamic load. 1 2 3 nc gnd v in adr36x 5 4 trim v out input 0.1 f output 0.1 f 05467-025 figure 33. basic configuration for the adr36x family stacking reference ics for arbitrary outputs some applications can require two reference voltage sources, which are a combined sum of standard outputs. figure 34 shows how this stacked output reference can be implemented. 05467-026 nc nc gnd gnd v in v in adr36x adr36x trim trim v out v out 1 1 2 2 3 3 5 5 4 4 v out2 v out1 v in c1 0.1 f c2 0.1 f figure 34. stacking voltage references with the adr36x two reference ics are used and fed from an unregulated input, v in . the outputs of the individual ics are connected in series, which provides two output voltages, v out1 and v out2 . v out1 is the terminal voltage of u1, while v out2 is the sum of this voltage and the terminal voltage of u2. u1 and u2 are chosen for the two voltages that supply the required outputs (see table 10 ). for example, if both u1 and u2 are adr361s, v out1 is 2.5 v and v out2 is 5.0 v. table 10. output u1/u2 v out1 v out2 adr361/adr365 2.5 7.5 adr361/adr361 2.5 5.0 adr365/adr361 5 7.5 a negative precision reference without precision resistors a negative reference is easily generated by adding an op amp, a1 and is configured in figure 35 . v outf and v outs are at virtual ground and, therefore, the negative reference can be taken directly from the output of the op amp. the op amp must be dual-supply, low offset, and rail-to-rail if the negative supply voltage is close to the reference output. 05467-027 nc gnd v in adr36x trim v out 1 2 3 ? + 5 4 ?v ref ?v dd +v dd figure 35. negative reference
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 18 of 20 general-purpose current source many times in low power applications, the need arises for a precision current source that can operate on low supply voltages. the adr36x can be configured as a precision current source (see figure 36 ). the circuit configuration illustrated is a floating current source with a grounded load. the references output voltage is bootstrapped across r set , which sets the output current into the load. with this configuration, circuit precision is maintained for load currents ranging from the references supply current, typically 150 a, to approximately 5 ma. nc gnd v in adr36x trim v out 1 2 3 5 4 i sy i set + i sy i set r1 p 1 +v dd r l 05467-028 r set figure 36. precision current source trim terminal the adr36x trim terminal can be used to adjust the output voltage over a nominal voltage. this feature allows a system designer to trim system errors by setting the reference to a voltage other than the standard voltage option. resistor r1 is used for fine adjustment and can be omitted if desired. the resistor values should be carefully chosen to ensure that the maximum current drive of the part is not exceeded. 05467-029 1 2 3 5 4 +v dd nc gnd v in adr36x trim v out v out r1 100k pot 10k r2 1k figure 37. adr36x trim configuration
adr360/adr361/adr363/adr364/adr365/adr366 rev. 0 | page 19 of 20 outline dimensions * compliant to jedec standards mo-193-ab with the exception of package height and thickness. pin 1 1.60 bsc 2.80 bsc 1.90 bsc 0.95 bsc 0.20 0.08 0.60 0.45 0.30 8 4 0 0.50 0.30 0.10 max seating plane * 1.00 max * 0.90 0.87 0.84 2.90 bsc 54 12 3 figure 38. 5-lead thin small outline transistor package [tsot] (uj-5) dimensions shown in millimeters ordering guide output voltage initial accuracy temperature coefficient models 1 (v o ) (mv) (%) (ppm/c) package description package option temperature range branding adr360aujz-reel7 2 2.048 6 0.29 25 5-lead tsot uj-5 C40c to +125c r0c adr360bujz-reel7 2 2.048 3 0.15 9 5-lead tsot uj-5 C40c to +125c r0d adr361aujz-reel7 2 2.5 6 0.24 25 5-lead tsot uj-5 C40c to +125c r0e adr361bujz-reel7 2 2.5 3 0.12 9 5-lead tsot uj-5 C40c to +125c r0f adr363aujz-reel7 2 3.0 6 0.2 25 5-lead tsot uj-5 C40c to +125c r0g adr363bujz-reel7 2 3.0 3 0.1 9 5-lead tsot uj-5 C40c to +125c r0h adr364aujz-reel7 2 4.096 8 0.2 25 5-lead tsot uj-5 C40c to +125c r0j adr364bujz-reel7 2 4.096 4 0.1 9 5-lead tsot uj-5 C40c to +125c r0k ADR365Aujz-reel7 2 5.0 8 0.16 25 5-lead tsot uj-5 C40c to +125c r0l adr365bujz-reel7 2 5.0 4 0.08 9 5-lead tsot uj-5 C40c to +125c r0m adr366aujz-reel7 2 3.3 8 0.25 25 5-lead tsot uj-5 C40c to +125c r08 adr366bujz-reel7 2 3.3 4 0.125 9 5-lead tsot uj-5 C40c to +125c r09 1 3,000 pieces per reel. 2 z = pb-free part.
adr360/adr361/adr363/adr364/adr365/adr366 rev. a | page 20 of 20 notes ?2006 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d05467-3/06(a)

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