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1.0 v precision low noise shunt voltage reference adr510 rev. b 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 ?2003C2007 analog devices, inc. all rights reserved. features precision 1.000 v voltage reference ultracompact 3 mm 3 mm sot-23 package no external capacitor required low output noise: 4 v p-p (0.1 hz to 10 hz) initial accuracy: 0.35% maximum temperature coefficient: 70 ppm/c maximum operating current range: 100 a to 10 ma output impedance: 0.3 maximum temperature range: ?40c to +85c applications precision data acquisition systems battery-powered equipment cellular phone notebook computer pda gps 3 v/5 v, 8-/12-bit data converters portable medical instruments industrial process control systems precision instruments pin configuration nc = no connect v+ 1 v? 2 trim/nc 3 adr510 top view (not to scale) 03270-001 figure 1. 3-lead sot-23-3 general description designed for space critical applications, the adr510 is a low voltage (1.000 v), precision shunt-mode voltage reference in an ultracompact (3 mm 3 mm) sot-23-3 package. the adr510 features low temperature drift (70 ppm/c), high accuracy (0.35%), and ultralow noise (4 v p-p) performance. the adr510 advanced design eliminates the need for an external capacitor, yet it is stable with any capacitive load. the minimum operating current increases from 100 a to a maximum of 10 ma. this low operating current and ease of use make the adr510 ideally suited for handheld battery-powered applications. a trim terminal is available on the adr510 to provide adjustment of the output voltage over 0.5% without affecting the temperature coefficient of the device. this feature provides users with the flexibility to trim out any system errors. v s i l + i q i q c out (optional) v out = 1.0v r bias i l adr510 i l + i q v s ? v out r bias = 0 3270-002 figure 2. typical operating circuit table 1. adr510 part output voltage, v out initial accuracy temperature coefficient adr510a 1.000 v 3.5 mv 0.35% 70 ppm/c
adr510 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 thermal resistance ...................................................................... 4 esd caution.................................................................................. 4 typical performance characteristics ............................................. 5 parameter definitions.......................................................................7 temperature coefficient...............................................................7 thermal hysteresis .......................................................................7 applications information .................................................................8 adjustable precision voltage source...........................................8 output voltage trim.....................................................................8 using the adr510 with precision data converters ................8 precise negative voltage reference ............................................9 outline dimensions ....................................................................... 10 ordering guide .......................................................................... 10 revision history 9/07rev. a to rev. b changes to adjustable precision voltage source section ........... 8 changes to figure 11........................................................................ 8 changes to figure 12........................................................................ 8 4/07rev. 0 to rev. a changes to table 1............................................................................ 1 changes to table 3 and table 4....................................................... 4 changes to figure 4, figure 5, figure 6, and figure 7 ................. 5 changes to thermal hysteresis section ........................................ 7 changes to figure 11........................................................................ 8 changes to figure 14 and equation 5 ............................................ 9 changes to ordering guide .......................................................... 10 8/03revision 0: initial version
adr510 rev. b | page 3 of 12 specifications electrical characteristics i in = 100 a to 10 ma @ t a = 25c, unless otherwise noted. table 2. parameter symbol conditions min typ max unit output voltage 1 v out 0.9965 1.0 1.0035 v initial accuracy v outerr ?3.5 +3.5 mv v outerr% ?0.35 +0.35 % temperature coefficient, a grade tcv out 0c < t a < 70c 70 ppm/c ?40c < t a < +85c 85 ppm/c output voltage change vs. i in ?v r i in = 0.1 ma to 10 ma 3 mv dynamic output impedance (?v r /?i r ) i in = 1 ma 100 a 0.3 minimum operating current i in 0c < t a < 70c 100 a voltage noise e n p-p f = 0.1 hz to 10 hz 4 v p-p turn-on settling time 2 t r to within 0.1% of output 10 s output voltage hysteresis v out_hys 50 ppm 1 the forward diode voltage characteristic at ?1 ma is typically 0.65 v. 2 measured without a load capacitor.
adr510 rev. b | page 4 of 12 absolute maximum ratings table 3. parameter rating reverse current 25 ma forward current 20 ma storage temperature range ?65c to +150c operating temperature range ?40c to +85c junction temperature range ?65c to +150c 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. package power dissipation = (t jmax ? t a )/ ja . table 4. thermal resistance package type ja jc unit 3-lead sot-23-3 (rt-3) 230 146 c/w esd caution
adr510 rev. b | page 5 of 12 60 50 40 30 20 10 v out (v) temperature (c) typical performance characteristics 1.002 1.001 1.000 0.999 0.998 0.997 07 v in = 5v/div v out = 500mv/div 3270-006 0 time (400ns/div) 03270-003 0 figure 3. typical v out vs. temperature time (400ns/div) v in = 5v/div v out = 500mv/div 0 3270-004 figure 4. turn-on time time (400s/div) v in = 5v/div v out = 500mv/div 0 3270-005 figure 5. turn-on time with 1 f input capacitor figure 6. turn-off time time (1ms/div) v in = 5v/div v out = 500mv/div 0 3270-007 figure 7. turn-off time with 1 f input capacitor time (2s/div) i in = 100a v out = 50mv/div 0 3270-008 figure 8. output response to 100 a input current change
adr510 rev. b | page 6 of 12 time (2s/div) i in = 100a v out = 50mv/div 0 3270-009 figure 9. output response to 100 a input current change with 1 f capacitor time (400ms/div) 2v/div 0 3270-010 figure 10. 1 hz to 10 hz noise
adr510 rev. b | page 7 of 12 parameter definitions temperature coefficient this is the change of output voltage with respect to the operating temperature changes, normalized by the output voltage at 25c. this parameter is expressed in parts per million/degrees celsius (ppm/c) and can be determined with the following equation: 6 10 )()( )()( c][ppm/ ? ? = t1t2c25v t1vt2v tcv out out out out (1) where: v out ( 25c ) is the output voltage at 25c. v out ( t 1 ) is the output voltage at temperature 1. v out ( t 2 ) is the output voltage at temperature 2. thermal hysteresis thermal hysteresis is the change of output voltage after the device is cycled through the temperature from 25c to 0c to 85c and back to 25c. tcout out hysout vc25v v _ _ )( ? = 6 _ _ 10 )( )( [ppm] ? = c25v vc25v v out tcout out hysout (2) where: v out (25c ) is the output voltage at 25c. v out_tc is the output voltage at 25c after temperature cycle at +25c to ?40c to +85c and back to +25c.
adr510 rev. b | page 8 of 12 applications information the adr510 is a 1.0 v precision shunt voltage reference designed to operate without an external output capacitor between the positive terminal and the negative terminal for stability. an external capacitor can be used for additional filtering of the supply. as with all shunt voltage references, an external bias resistor (r bias ) is required between the supply voltage and the adr510 (see figure 2 ). r bias sets the current that is required to pass through the load (i l ) and the adr510 (i q ). the load and the supply voltage can vary, thus r bias is chosen based on the following conditions: ? r bias must be small enough to supply the minimum i q current to the adr510 even when the supply voltage is at minimum value and the load current is at maximum value. ? r bias also needs to be large enough so that i q does not exceed 10 ma when the supply voltage is at its maximum value and the load current is at its minimum value. given these conditions, r bias is determined by the supply voltage (v s ), the load and operating current (i l and i q ) of the adr510, and the adr510 output voltage. q l out s bias ii vv r + ? = (3) adjustable precision voltage source the adr510, combined with a precision low input bias op amp such as the ad860x, can be used to output a precise adjustable voltage. figure 11 illustrates implementation of this application using the adr510. output of the op amp, v out , is determined by the gain of the circuit, which is completely dependent on the r2 and r1 resistors. r1 r2 v out += 1 (4) an additional capacitor in parallel with r2 can be added to filter out high frequency noise. the value of c2 is dependent on the value of r2. v cc v out = (1 + r2/r1) r bias a dr510 1.0v ad860x r2 r1 c2 (optional) 03270-011 figure 11. adjustable precision voltage source output voltage trim using a mechanical or digital potentiometer, the output voltage of the adr510 can be trimmed 0.5%. the circuit in figure 12 illustrates how the output voltage can be trimmed using a 10 k potentiometer. note that trimming using other resistor values may not produce an accurate output from the adr510. v cc v out r bias adr510 pot 10k? r1 470k ? 03270-012 1 2 3 figure 12. output voltage trim using the adr510 with precision data converters the compact adr510 and its low minimum operating current requirement make it ideal for use in battery-powered portable instruments, such as the ad7533 cmos multiplying dac, that use precision data converters. figure 13 shows the adr510 serving as an external reference to the ad7533 , a cmos multiplying dac. such a dac requires a negative voltage input in order to provide a positive output range. in this application, the adr510 is supplying a ?1.0 v reference to the ref input of the ad7533 . 0 1 v dd msb g n 9 lsb v out = 0v to 1.0v + ? ad7533 ?v dd r2 adr510 + ? 1 32 1 15 0 3270-013 figure 13. adr510 as a reference for a 10-bit cmos dac (ad7533)
adr510 rev. b | page 9 of 12 precise negative voltage reference the adr510 is suitable for use in applications where a precise negative voltage reference is desired, including the application detailed in figure 13 . figure 14 shows the adr510 configured to provide an output of ?1.0 v. ?1.0v i ?v dd r1 adr510 + ? 03270-014 figure 14. precise ?1.0 v reference configuration because the adr510 characteristics resemble those of a zener diode, the cathode shown in figure 14 is 1.0 v higher with respect to the anode (v+ with respect to v? on the adr510 package). because the cathode of the adr510 is tied to ground, the anode must be ?1.0 v. r1 in figure 14 should be chosen so that 100 a to 10 ma is provided to properly bias the adr510. i v r1 dd )(1 ??? = (5) the r1 resistor should be chosen so that power dissipation is at a minimum. an ideal resistor value can be determined through manipulation of equation 5.
adr510 rev. b | page 10 of 12 outline dimensions 3.04 2.90 2.80 pin 1 1.40 1.30 1.20 2.64 2.10 1.90 bsc 1 2 3 seating plane 1.12 0.89 0.10 0.01 0.50 0.30 0.20 0.08 0.60 0.50 0.40 0.95 bsc compliant to jedec standards to-236-ab figure 15. 3-lead small outline transistor package [sot-23-3] (rt-3) dimensions shown in millimeters ordering guide model output voltage (v out ) initial accuracy temperature coefficient temperature range package description package option ordering quantity branding adr510art-reel7 1.0 v 3.5 mv 0.35% 70 ppm/c ?40c to +85c 3-lead sot-23-3 rt-3 3,000 raa adr510art-r2 1.0 v 3.5 mv 0.35% 70 ppm/c ?40c to +85c 3-lead sot-23-3 rt-3 250 raa ADR510ARTZ-REEL7 1 1.0 v 3.5 mv 0.35% 70 ppm/c ?40c to +85c 3-lead sot-23-3 rt-3 3,000 raa# adr510artz-r2 1 1.0 v 3.5 mv 0.35% 70 ppm/c ?40c to +85 c 3-lead sot-23-3 rt-3 250 raa# 1 z = rohs compliant part. # denotes lead free, may be top or bottom marked.
adr510 rev. b | page 11 of 12 notes
adr510 rev. b | page 12 of 12 notes ?2003C2007 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d03270-0-9/07(b)

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