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high temp er a ture , low drift, micropower 2.5 v reference data sheet ADR225 rev. b document feedback 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 r ights 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 proper ty of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062 - 9106, u.s.a. tel: 781.329.4700 ? 2013 analog devices, inc. all rights reserved. technical support www.analog.com features extreme high temperature operation ? 40 c to +210c, 8 - lead flatpack ?40c to +175c, 8 - lead soic temperature coefficient 4 0 ppm/c, 8 - lead flatpack 10 ppm/c, 8 - lead soic high output current: 10 ma low supply current: 50 a max imum initial acc uracy: 0.4% ( 10 mv maximum) , 8 - lead soic low dropout voltage wide supply range: 3.3 v to 16 v applications down - hole drilling and instrumentation avionics heavy industrial high temperature environments pin configuration nc 1 v s 2 nc 3 gnd 4 nc 8 nc 7 output 6 nc 5 notes 1. nc = no connec t . do not connect t o this pin. ADR225 t o p view (not to scale) 1 1525-001 figure 1 . pin configuration for soic and flatpack packages general description the ADR225 is a precision 2.5 v band gap voltage reference specified for a high temperature operation of 175 c and 210 c . it uses a micropower core topology and laser trimming of highly stable, thin film resistors to achieve a temperature coefficient of 30 ppm/ c (max imum ) up to 175 c and an initial accuracy of 0.4% (10 mv max imum ) . a maximum operating current of 50 a an d a low dropout voltage allow the ADR225 to function very well in battery - powered equipment. the ADR225 voltage reference is offered in a n 8 - lead soic package with an operating temperature range of ? 40c to +175c. it is also available in an 8 - lead ceramic flat pack ( flatpack ) with an operating temperature range of ?40c to + 210c. both devices are designed for robustness at extreme tempera tures and are qualified for 1000 hours of operation at the maximum temperature rating. the ADR225 is a member of a growing series of high temperature qualified products offered by analog devices, i nc. for a complete selection table of the available high temperature products, see the high temperature product list and qualification data available at www.analog.com/hightemp .
ADR225 data sheet rev. b | page 2 of 12 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 pin configuration ............................................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 electrical characteristics ............................................................. 3 absolute maximum ratings ............................................................ 4 predicted lifetime vs. operating temperature .........................4 thermal resistance .......................................................................4 esd caution ...................................................................................4 typical performance character istics ..............................................5 theory of operation .........................................................................9 basic voltage reference connections ........................................9 outline dimensions ....................................................................... 10 ordering guide .......................................................................... 10 revision history 11/13 rev. a to rev. b change to features section ............................................................. 1 added caption to figure 1 .............................................................. 1 changes to table 1 ............................................................................ 3 added figure 6, figure 7, figure 8, figure 12, figure 13, figure 14, figure 18, and figure 19 ; renumbered sequentially ....................................................................................... 5 9/ 13 rev. 0 to rev. a changes to data sheet title and added wide supply range: 3.3 v to 16 v to features section .............................................................. 1 change d supp ly voltage from ?0.3 v to +15 v to ?0.3 v to +18 v ; table 2 .................................................................................... 4 7/ 13 rev ision 0: initial version
data sheet ADR225 rev. b | page 3 of 12 specifications electrical character istics v s = 3.3 v, v out = 2.5 v, t min < t a < t max , unless otherwise noted. table 1. 8 - lead soic 8 - lead flatpack ? 40 c t a +175 c ? 40c t a +210c parameter symbol test conditions /comments min typ max min typ max unit supply current i sy no load 30 50 40 60 a initial accuracy 1 v o i out = 0 ma 2 10 5 60 mv temperature coefficient 2 tcv o ut i out = 0 ma 10 30 40 80 ppm/c regulation line regulation v o ut /v in 3.0 v v s 15 v, i out = 0 ma 0.025 0.1 0.25 1.5 m v /v l oad regulation 3 v o ut /v load v s = 5.0 v, 0 ma i out 10 ma 0.025 0.1 0.25 1.5 mv /ma voltage d ropout voltage v s ? v o ut i load = 10 ma 1.00 1.00 v noise voltage e n 0.1 hz to 10 hz 25 25 v p -p 1 for proper operation, a 1 f capacitor is required between the output pin and the gnd pin of the device. 2 tcv o ut is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/ c. tcv o ut = ( v ma ? v min )/ v o ut ( t ma ? t min ) 3 load regulation specification include s the effect of self - heating.
ADR225 data sheet rev. b | page 4 of 12 absolute maximum rat ings table 2. parameter rating supply voltage ?0.3 v to +18 v output to gnd ?0.3 v to v s + 0.3 v s torage temperature range ? 65c to +150c operating temperature range 8- lead soic ? 40c to +175c 8- lead flatpack ? 40 c to +210c junction temperature range 8 - lead soic ?40c to +200c 8- lead flatpack ?40c to + 245c 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. predicted lifetime vs. operating temperature comprehensive reliability testing is performed on the ADR225 . product li fetimes at extended operating temperature are obtained using high temperature operating life (htol). lifetimes are predicted from the arrhenius equation, taking into account potential design and manufacturing failure mechanism assumptions. htol is performed to jedec jesd22 - a108. a minimum of three wafer fab and assembly lots are processed through htol at the maximum operating temperature. comprehensive reliability testing is performed on all a nalog devices, inc., high temperature (ht) products. 1 100k 10k 1k 100 10 120 210 200 190 180 170 160 150 140 130 predicted lifetime (hours) operating temperature (c) 11525-021 figure 2 . predicted lifetime vs. operating temperature thermal resistance ja is specified for worst - case conditions; that is, ja is specified for the device soldered in the circuit board. table 3. package type ja jc unit 8- lead soic 121 43 c/w 8- lead flatpack 100 15 c/w esd caution
data sheet ADR225 rev. b | page 5 of 12 typical performance characteristics v s = 3.3 v, v out = 2.5 v, t min t a t max for 8 - lead soic package , un less otherwise noted. 2.490 2.495 2.500 2.505 2.510 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 140 155 170 output voltage (v) temperature (c) 1 1525-004 figure 3 . output voltage ( v out ) vs. temp erature 0 2 4 6 8 10 12 14 16 18 ?30 ?24 ?18 ?12 ?6 0 6 12 18 24 30 number of units tcv out (ppm/c) 1 1525-005 figure 4 . tcv out distribution , ? 40 c to +175c 0 10 20 30 40 50 60 70 ?0.5 ?0.4 ?0.3 ?0.2 ?0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 number of parts output voltage accuracy (%) 1 1525-006 figure 5 . output voltage accuracy at 175c 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 ?50 ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 100 1 10 120 130 140 150 160 170 180 190 200 210 output vo lt age (v) temper a ture (c) 1 1525-100 f igure 6 . output voltage (v out ) vs. temperature , flatpack package 0 1 2 3 4 5 6 7 0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 number of units tcv out (ppm/c) 1 1525-101 figure 7 . tcv out distribution, ?40c to + 210 c , flatpack package 0 5 10 15 20 25 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 number of parts output vo lt age accurac y (%) 1 1525-102 figure 8 . output voltage accuracy at 210 c , flatpack package
ADR225 data sheet rev. b | page 6 of 12 0 5 10 15 20 25 30 35 40 45 50 ?40 ?25 ?10 5 20 35 50 65 80 95 1 10 125 140 155 170 supp l y current ( a) temper a ture (c) 1 1525-007 figure 9 . supply current ( i sy ) vs. temperature ?30 ?25 ?20 ?15 ?10 ?5 0 ? 40 ? 25 ? 10 5 20 35 50 65 80 95 1 10 125 140 155 170 load regul a tion (ppm/ma) temper a ture (c) 1 1525-009 figure 10 . load regulation vs. temperature ( i load = 0 ma to 10 ma) ?10 0 10 20 30 40 50 60 ? 40 ? 25 ? 10 5 20 35 50 65 80 95 1 10 125 140 155 170 line regul a tion (ppm/v) temper a ture (c) 1 1525-008 figure 11 . line regulation vs. temperature 5 10 15 20 25 30 35 40 45 50 55 60 supply current (a) ?50 ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 temperature (c) 11525-103 figure 12 . supply current (i sy ) vs. temperature , flatpack package ?500 ?450 ?400 ?350 ?300 ?250 ?200 ?150 ?100 ?50 0 50 load regulation (ppm/ma) ?50 ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 temperature (c) 11525-104 figure 13 . load regulation vs. temperature (i load = 0 ma to 10 ma) , flatpack package ?50 0 50 100 150 200 250 300 350 400 450 500 line regulation (ppm/v) ?50 ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 temperature (c) 11525-105 figure 14 . line regulation vs. temperature , flatpack package
data sheet ADR225 rev. b | page 7 of 12 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 2 4 6 8 10 12 dropout vo lt age (v) load current (ma) ?40c +25c +175c 1 1525-010 figure 15 . dropout voltage vs. load current (i load ) 2.496 2.498 2.500 2.502 2.504 2.506 2.508 40 55 70 85 100 1 15 130 145 160 175 output vo lt age (v) temper a ture (c) unit 1 unit 3 unit 5 1 1525-0 1 1 figure 16 . thermal hysteresis , i load = 0 ma m100 s a ch1 4.4v 2 ch1 2v ch2 1v 1 b w v in = 2v/div c out = 1 f no load v out = 1v/div 1 1525-013 figure 17 . power - on response (see figure 25) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 2 4 6 8 10 12 dropout voltage (v) load current (ma) 11525-106 ?40c +25c +210c figure 18 . dropout voltage vs. load current (i load ), flatpack package 2.495 2.500 2.505 2.510 2.515 2.520 2.525 2.530 2.535 2.540 25 40 55 70 85 100 115 130 145 160 175 190 205 output voltage (v) temperature (c) 11525-107 figure 19 . thermal hysteresis, i load = 0 ma, flatpack package 10v 5v 0v 2 m200 s a ch1 7.3v ch1 5v ch2 200mv b w 1 v out = 2 00mv/div v in = 5v/div c in = c out = 1 f r l = 10k 1 1525-014 figure 20 . line transient response (see figure 25)
ADR225 data sheet rev. b | page 8 of 12 ch2 20mv ch1 1v m100 s a ch1 1.32v 1 2 v out = 20mv/div c out = 1 f load current 0ma 10ma 1 1525-012 figure 21 . load transient response ?120 ?100 ?80 ?60 ?40 ?20 0 power supp l y rejection r a tio (db) frequenc y (hz) 10 100 1k 10k 100k 1m 10m 1 1525-015 figure 22 . power supply rejection ratio (psrr) vs. freque ncy , c l oad = 1 f output impedance () frequency (hz) 1 10 100 1k 10k 100k 1m 11525-020 0.01 0.02 0.04 0.08 0.16 0.32 0.64 1.28 2.56 5.12 10.24 figure 23 . output impedance ( z out ) vs. frequency , c in = c out = 1 f
data sheet ADR225 rev. b | page 9 of 12 theory of operation basic voltage refere nce connections the circuit shown in figure 24 is the basic config uration for the ADR225 . note that a 10 f and 0.1 f bypass network on the input and at least a 1 f bypass capacitor on the output are required for proper device operation. it is recommended that no connect ions be made to pin 1, pin 3, pin 5, pin 7, and pin 8. nc v s nc nc nc output nc nc = no connec t . ADR225 1 1525-002 + + 1f tant 1f 10 f 0.1 f 1 8 2 7 3 6 4 5 figure 24 . basic voltage reference connections + + 11525-017 u2a ad8634 u1 ADR225 v s gnd output c1 10f c2 0.1f c 3 1f c4 0.1f v out r2 2.5k r3 2.5k ?in a +in a vcc +5v v+ +5v +v s +5v v? ?v s ?in +in ?5v ?5v rtd u3 ad8229 r1 2.5k figure 25 . typical high temperature resistance temperature detector (rtd) signal conditioning circuit
ADR225 data sheet rev. b | page 10 of 12 outline dimensions c o n t r o l l i n g d i m e n s i o n s a r e i n m i l l i m e t e r s ; i n c h d i m e n s i o n s ( i n p a r e n t h e s e s ) a r e r o u n d e d - o f f m i l l i m e t e r e q u i v a l e n t s f o r r e f e r e n c e o n l y a n d a r e n o t a p p r o p r i a t e f o r u s e i n d e s i g n . c o m p l i a n t t o j e d e c s t a n d a r d s m s - 0 1 2 - a a 0 1 2 4 0 7 - a 0 . 2 5 ( 0 . 0 0 9 8 ) 0 . 1 7 ( 0 . 0 0 6 7 ) 1 . 2 7 ( 0 . 0 5 0 0 ) 0 . 4 0 ( 0 . 0 1 5 7 ) 0 . 5 0 ( 0 . 0 1 9 6 ) 0 . 2 5 ( 0 . 0 0 9 9 ) 4 5 8 0 1 . 7 5 ( 0 . 0 6 8 8 ) 1 . 3 5 ( 0 . 0 5 3 2 ) s e a t i n g p l a n e 0 . 2 5 ( 0 . 0 0 9 8 ) 0 . 1 0 ( 0 . 0 0 4 0 ) 4 1 8 5 5 . 0 0 ( 0 . 1 9 6 8 ) 4 . 8 0 ( 0 . 1 8 9 0 ) 4 . 0 0 ( 0 . 1 5 7 4 ) 3 . 8 0 ( 0 . 1 4 9 7 ) 1 . 2 7 ( 0 . 0 5 0 0 ) b s c 6 . 2 0 ( 0 . 2 4 4 1 ) 5 . 8 0 ( 0 . 2 2 8 4 ) 0 . 5 1 ( 0 . 0 2 0 1 ) 0 . 3 1 ( 0 . 0 1 2 2 ) c o p l a n a r i t y 0 . 1 0 figure 26 . 8 - lead standard small outline package [soic_n] narrow body (r - 8) dimensions shown in millimeters and (i nches) 03-26-2013-a 0. 2 6 0 0. 2 55 s q 0. 2 5 0 1. 0 0 t op view bot t om view end view side view 0 . 012 r typ 0.1 7 5 0.0 2 6 mi n 0. 1 9 5 0. 1 90 s q 0. 1 8 5 0. 1 5 5 0. 1 5 0 0. 1 4 5 0. 0 5 3 0. 0 5 0 0. 0 4 7 0. 0 0 6 0. 0 0 5 0. 0 0 4 0. 0 9 1 0. 0 8 3 0. 0 7 5 0. 0 1 9 0. 0 1 7 0. 0 1 5 1 4 8 5 idex mark 0. 0 5 4 0. 0 4 4 0. 0 3 4 0.0 5 t y p 0.0 2 4 0.0 0 7 mi n 0.0 3 5 ty p figure 27 . 8 - lead ceramic flat package [flatpack] (f - 8 - 2) dimensions shown in inches ordering guide model 1 temperature range package description package option ADR225hrzn ?40c to +175c 8- lead standard small outline package [soic_n] r -8 ADR225hfz ?40c to +210c 8- lead ceramic flat package [flatpack] f-8-2 1 z = rohs compliant part.
data sheet ADR225 rev. b | page 11 of 12 notes
ADR225 data sheet rev. b | page 12 of 12 notes ? 2013 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d11525 - 0- 11/13(b)

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