advanced monolithic systems, inc. 6680b sierra lane, dublin, ca 94568 phone (925) 556-9090 fax (925) 556-9140 advanced ams285-2.5/ams385-2.5 monolithic micropower voltage reference diode systems features applications 20 mv ( 0.8%) max. initial tolerance (a grade) battery powered systems operating current 20 m m a to 20ma instrumentation low voltage reference 2.5v a/d, d/a converters max. 0.6 w w dynamic impedance (a grade) temperature measurement low temperature coefficient current sources 1.2v device and adjustable device also available notebook/personal computer ams285-1.2 and ams285 series, respectively monitors/ vcr/ tv ams385-1.2 and ams385 series. pagers general description the ams285-2.5/ams385-2.5 are two-terminal micropower band-gap voltage reference diodes. they feature a very low dynamic impedance and good temperature coefficient, operating over a 20 a to 20ma current range. on-chip trimming is used to provide tight voltage tolerance. since the ams285-2.5/ams385-2.5 is a band-gap reference, uses only transistors and resistors, low noise and good long term stability result. careful design of the ams285-2.5/ams385-2.5 has made the device exceptionally tolerant of capacitive loading, making it easy to use in almost any reference application. the wide dynamic operating range allows its use with widely varying supplies with excellent regulation. the extremely low power drain of the ams285-2.5/ams385-2.5 makes these reference diodes useful for micropower circuitry. these voltage references can be used to make portable meters, regulators or general purpose analog circuitry with battery life approaching shelf life. further more, the wide operating current allows it to replace older references with a tight tolerance part. the ams285-2.5 is operational in the full industrial temperature range of -40 c to 85 c while ams385-2.5 is operating over a 0 c to 70 c temperature range. the ams285-2.5/ams385-2.5 are available in to-92, so-8 and sot-89 packages. ordering information: tol. package type operating to-92 8 lead soic sot-89 temperature range 20mv ams285-2.5an ams285-2.5as ams285-2.5al -40 to 85 c 38mv ams285-2.5bn ams285-2.5bs ams285-2.5bl -40 to 85 c 75mv ams285-2.5cn ams285-2.5cs ams285-2.5cl -40 to 85 c 20mv ams385-2.5an ams385-2.5as ams385-2.5al 0 to 70 c 38mv ams385-2.5bn ams385-2.5bs ams385-2.5bl 0 to 70 c 75mv ams385-2.5cn ams385-2.5cs ams385-2.5cl 0 to 70 c
advanced monolithic systems, inc. 6680b sierra lane, dublin, ca 94568 phone (925) 556-9090 fax (925) 556-9140 ams285-2.5/ams385-2.5 absolute maximum ratings reverse current 30ma storage temperature -55 c to +150 c forward current 10ma soldering information operating temperature range to-92 package: 10 sec. 260 c ams285-2.5 -40 c to 85 c soic package: vapor phase (60 sec) 215 c ams385-2.5 0 c to 70 c infrared (15 sec.) 220 c sot-89 package: 10 sec. 265 c electrical characteristics electrical characteristics at i r = 100 m a, and t a = +25c unless otherwise specified. parameter conditions ams285a-2.5 min typ max ams285b-2.5 min typ max ams285c-2.5 min typ max units reverse breakdown voltage (note 4) i r - 100 a 2.480 2.500 2.520 2.462 2.500 2.538 2.425 2.500 2.575 v reverse dynamic impedance (note 4) i r - 100 a, f =20hz 0.2 0.60 1 1 w reverse breakdown voltage change with current (note 4) 10 m a i r 1ma 1ma i r 20ma 1.0 10 1.0 10 2.0 20 mv min. operating current (note 4) 12 18 20 13 20 30 13 20 30 m a m a wide band noise (note 5) i r - 100 a, 10hz f 10khz 120 120 120 m v temperature coeff. (note 6) 25 50 100 150 ppm/c long term stability (note 5) t a =25c.1c t = 1000 hr 20 20 20 ppm electrical characteristics electrical characteristics at i r = 100 m a, and t a = +25c unless otherwise specified. parameter conditions ams385a-2.5 min typ max ams385b-2.5 min typ max ams385c-2.5 min typ max units reverse breakdown voltage (note 4) i r - 100 a 2.480 2.500 2.520 2.462 2.500 2.538 2.425 2.500 2.575 v reverse dynamic impedance (note 4) i r - 100 a, f =20hz 0.2 0.60 1 1 w reverse breakdown voltage change with current (note 4) 10 m a i r 1ma 1ma i r 20ma 1.0 10 2.0 20 2.0 20 mv min. operating current (note 4) 12 18 20 13 20 30 13 20 30 m a m a wide band noise (note 5) i r - 100 a, 10hz f 10khz 120 120 120 m v temperature coeff. (note 6) 25 50 100 150 ppm/c long term stability (note 5) t a =25c.1c t = 1000 hr 20 20 20 ppm
advanced monolithic systems, inc. 6680b sierra lane, dublin, ca 94568 phone (925) 556-9090 fax (925) 556-9140 ams285-2.5/ams385-2.5 note 1: absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. for guaranteed specifications and test conditions, see the electrical characteristics . the guaranteed specifications apply only for the test conditions listed. note 2: for elevated temperature operation, t j max is: ams285 +125c ams385 +100c thermal resistance to-92 so-8 sot-89 j ja (junction to ambient) 170c/w (0.125? leads) 165c/w 160c/w note 3: parameters identified with boldface type apply at temperature extremes. all other numbers apply at t a = t j = 25c. note 4: guaranteed and 100% production tested. note 5: guaranteed but not 100% production tested. these limits are not used to calculate average outgoing quality levels. note 6: the average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures between the operating t max and t min , divided by t max - t min . the measured temperatures are 0 c, 25 c, 70 c and 85 c. pin connections to-92 8l soic sot-89 plastic package (n) so package (s) (l) 1 2 3 1 2 8 4 3 7 5 6 n/c n/c n/c n/c n/c n/c + - n/c - + 1 2 3 bottom view top view top view typical applications wide input micropower reference range reference from 9v battery 3.3k lm334 out 2.5v ams385-2.5 v in = 3.7v to 30v ams385-2.5 2.5v 200k 9v
advanced monolithic systems, inc. 6680b sierra lane, dublin, ca 94568 phone (925) 556-9090 fax (925) 556-9140 ams285-2.5/ams385-2.5 typical applications (continued) 0 c - 100 c thermometer 0 c - 100 c thermometer ams385-2.5 1k r1 8k r2 1k r3 100 r4 220 3v r v - v + lm334 m 0-100 m a i out calibration 1. short ams385-2.5, adjust r3 for i out = temp at 1 m a/ k 2. remove short, adjust r2 for correct reading in c ams385-2.5 150 r1 4k r2 1k r3 50 r4 100 3v r v - v + lm334 m 0-50 m a i out calibration 1. short ams385-2.5, adjust r3 for i out = temp at 1.8 m a/ k 2. remove short, adjust r2 for correct reading in f micropower* 5v regulator micropower* 10v reference 150pf ams385-2.5 100k 10m 2.2k 7 4 6 2 3 - + v in 3 5.2v i q v o = 5v i l 100ma lm4250c 8 r v - v + lm334 2k 100k 47k 2n2905 1n457 1n457 + 4.7 m f tantalum *i q @ 40 m a 150pf ams385-2.5 1.5m 500k 22m 500k 7 4 6 3 2 - + v in = 15v i q 10v lm4250c 8 *i q @ 20 m a standby current
advanced monolithic systems, inc. 6680b sierra lane, dublin, ca 94568 phone (925) 556-9090 fax (925) 556-9140 ams285-2.5/ams385-2.5 typical applications (continued) micropower thermocouple cold junction compensator + lm334 ams385-2.5 r1 r2 zero adj 100k 1m 1% 18k 2k 1% tc adj 500 meter 3v lithium + - v + v - r thermocouple + - cold junction iso thermal with lm334 adjustment procedure 1. adjust tc adj pot until voltage across r1 equals kelvin temperature multiplied by the thermocouple seebeck coefficient. 2. adjust zero adj pot until voltage across r2 equals the thermocouple seebeck coefficient multiplied by 273.2. thermocouple seebeck r1 r2 voltage voltage type coefficient ( w w ) ( w w ) across r1 across r2 (mv/ c) @ 25 c (mv) (mv) j 52.3 523 1.24k 15.60 14.32 t 42.8 432 1k 12.77 11.78 k 40.8 412 953 w 12.17 11.17 s 6.4 63.4 150 w 1.908 1.766 typical supply current 50 m a precision 1 m m a to 1ma current sources 7 4 3 2 + - lm312 6 ams385-2.5 r2 r1 68k -30v -1.5v to -27v c1 150pf i out * *i out =2.5v/r2 7 4 3 2 + - lm312 6 r2 r1 68k 30v 1.5v to 27v c1 150pf i out * ams385-2.5
advanced monolithic systems, inc. 6680b sierra lane, dublin, ca 94568 phone (925) 556-9090 fax (925) 556-9140 ams285-2.5/ams385-2.5 typical performance characteristics -4 4 8 16 0.1 1 10 100 reverse characteristics 0 output voltage change (mv) t a =25 c 0.1 1000 0.1 1 10 100 reverse dynamic impedance 1 100 dynamic impedance ( w ) 0.01 0 0.4 1.6 0.1 1 10 100 0.8 0.01 reverse current (ma) reverse current (ma) 0 0.5 1.0 1.5 2.0 2.5 0.1 100 10 3.0 reverse voltage (v) reverse current ( m a) 1 reverse characteristics forward characteristics forward current (ma) forward voltage (v) 10 100 1k 10k 100k 0.1 1k 10 reverse dynamic impedance 1m frequency (hz) dynamic impedance ( w ) 1 10k 100 -55 5 25 45 65 85 105 2.530 2.490 125 reference voltage (v) temperature drift 0 10 0 1.0 3.0 0 200 400 600 time ( m s) response time voltage swing (v) 2.0 ~ ~ ~ ~ 0 400 800 1200 1400 100 1k 10k 100k noise voltage 200 1000 noise (nv/ ? hz) i r = 100 m a 10 frequency (hz) 600 100 1k 10k 100k cutoff frequency (hz) integrated noise ( m v ) 0 20 40 60 80 100 120 temperature ( c) 2.510 2.470 2.460 -35 -15 i r = 100 m a t a =-55 c t a =125 c t a =125 c t a =-55 c t a =25 c t a =-55 c t a =25 c t a =125 c t a =25 c i r = 100 m a t a =-55 c t a =25 c t a =125 c i r = 100 m a 100 m a output ams385-2.5 output 100k input output input single pole low pass sharp cutoff filter filtered output noise 0.01 10 12 1.2 2.520 2.500 2.480 2.450
advanced monolithic systems, inc. 6680b sierra lane, dublin, ca 94568 phone (925) 556-9090 fax (925) 556-9140 ams285-2.5/ams385-2.5 package dimensions inches (millimeters) unless otherwise noted. 3 lead to-92 plastic package (n) 8 lead soic plastic package (s) 0.1400.010 (3.5560.127) 0.0600.010 (1.5240.254) 0.0150.002 (0.3810.051) 0.0160.003 (0.4060.076) 0.0500.005 (1.2700.127) 0.0600.005 (1.5240.127) dia 0.1800.005 (4.5720.127) 0.1800.005 (4.5720.127) 0.050 (1.270) max 0.500 (12.70) min uncontrolled lead dimensions 10 nom 5 nom n (to-92 ) ams drw# 042391 0.90 (2.286) nom 0-8 typ 0.010-0.020 (0.254-0.508) s (so-8 ) ams drw# 042293 x 45 0.016-0.050 (0.406-1.270) 0.008-0.010 (0.203-0.254) 0.004-0.010 (0.101-0.254) 0.014-0.019 (0.355-0.483) 0.053-0.069 (1.346-1.752) 0.050 (1.270) typ 0.150-0.157** (3.810-3.988) 0.228-0.244 (5.791-6.197) 0.189-0.197* (4.801-5.004) *dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side **dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side 1 2 3 4 8 7 6 5
advanced monolithic systems, inc. 6680b sierra lane, dublin, ca 94568 phone (925) 556-9090 fax (925) 556-9140 ams285-2.5/ams385-2.5 package dimensions inches (millimeters) unless otherwise noted (continued). sot-89 plastic package (l) 0.090-0.102 (2.29-2.60) 0.173-0.181 (4.40-4.60) 0.064-0.072 (1.62-1.83) 0.155-0.167 (3.94-4.25) 0.059 (1.50) bsc 0.035-0.047 (0.89-1.20) l (sot-89 ) ams drw# 042392 0.118 (3.00) bsc 0.014-0.019 (0.36-0.48) 0.017-0.022 (0.44-0.56) 0.084-0.090 (2.13-2.29) 0.055-0.063 (1.40-1.60) 0.014-0.017 (0.35-0.44)
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