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micro-power, high-accuracy voltage references preliminary technical data adr3412/3420/3425/3430/3433/3440/3450 rev. pr 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 ?2009 analog devices, inc. all rights reserved. features initial accuracy: 0.1% max. temp. coefficient: 10 ppm / c operating temperature: -40c C +125 c output current: +10 ma source / -3 ma sink low quiescent current: 70 a (max) low dropout voltage: 200 mv @ 2 ma output noise (0.1 C 10 hz): < 10 v p-p @ 1.25 v sot23-6 package applications precision data acquisition systems high-resolution data converters industrial instrumentation medical devices automotive controls battery-powered devices pin configuration figure 1. 6-lead sot23 general description the adr 34 xx series of devices are low-cost, low-power, high precision voltage references, featuring 0.1% initial accuracy, low operating current and low output noise in a small sot23 package. for high accuracy, output voltage and temperature coefficient are trimmed digitally during final assembly using analog devices proprietary digi-trim technology. stability and reliability are further improved by the devices low output voltage hysteresis and low long-term output voltage drift. furthermore, the low operating current of the device (70 a max) facilitates usage in low-power devices, while its low output noise helps maintain signal integrity in critical signal processing systems. adr 34 xx series references are available in a wide range of output voltages, all of which are specified over the industrial temperature range of -40c to +125 c. table 1. selection guide model output voltage (v) input voltage range (v) adr3412 1.200 2.3 C 5.5 adr3420 2.048 2.3 C 5.5 adr3425 2.500 2.7 C 5.5 adr3430 3.000 3.2 C 5.5 ADR3433 3.300 3.5 C 5.5 adr3440 4.096 4.3 C 5.5 adr3450 5.000 5.2 C 5.5 1 2 34 5 6 adr34xx top view (not to scale) gnd force v out force v in gnd sense enable v out sense
adr3412/3420/3425/3430/3433/3440/3450 preliminary technical data rev. pr b | page 2 of 13 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? pin configuration .............................................................................. 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? adr3412 electrical characteristics .......................................... 3 ? adr3420 electrical characteristics .......................................... 3 ? adr3425 electrical characteristics .......................................... 4 ? adr3430 electrical characteristics .......................................... 4 ? ADR3433 electrical characteristics .......................................... 5 ? adr3440 electrical characteristics .......................................... 5 ? adr3450 electrical characteristics .......................................... 6 ? absolute maximum ratings ............................................................7 ? thermal resistance .......................................................................7 ? esd caution...................................................................................7 ? pin configuration and function descriptions ..............................8 ? typical performance characteristics ..............................................9 ? terminology .................................................................................... 10 ? theory of operation ...................................................................... 11 ? power dissipation....................................................................... 11 ? applications ..................................................................................... 12 ? basic voltage reference connection ....................................... 12 ? input and output capacitors .................................................... 12 ? outline dimensions ....................................................................... 13 ? ordering guide ............................................................................... 13 ?
preliminary technical data adr3412/3420/3425/3430/3433/3440/3450 rev. pr b | page 3 of 13 specifications adr3412 electrical characteristics unless otherwise noted, v in = 2.3 to 5.5 v, i l = 0, t a = 25c. table 2. parameter symbol conditions min typ max unit output voltage v out 1.200 v initial accuracy v oerr 0.1 % 1.2 mv temperature coefficient tcv out 10 ppm / c line regulation v o / v in v in = 2.4 v to 5.5 v 5 20 ppm / v v in = 2.4 v to 5.5 v , -40c t a +125c 40 150 ppm / v load regulation v o / i l i l = -3 ma to +10 ma 12 20 ppm / ma i l = -3 ma to +10 ma , -40c t a +125c 50 ppm / ma quiescent current i q 70 a -40c t a +125c 90 a dropout voltage v do i l = 2 ma, t a = -40c t a +125c 1.1 v ripple rejection ratio rrr f in = 10 khz tbd db output current capacity sinking sourcing i l -3 10 ma ma output voltage noise e np-p 9 10 v p-p output voltage noise density e n 1.5 v rms output voltage hysteresis v out_hys t a = +25c -40c +125c +25c 50 ppm long-term stability v out_ltd 1000 hours @ 25c 50 ppm turn-on settling time t r 140 s adr3420 electrical characteristics unless otherwise noted, v in = 2.3 to 5.5 v, i l = 0, t a = 25c. table 3. parameter symbol conditions min typ max unit output voltage v out 2.048 v initial accuracy v oerr 0.1 % 2.1 mv temperature coefficient tcv out 10 ppm / c line regulation v o / v in v in = 2.4 v to 5.5 v 5 20 ppm / v v in = 2.4 v to 5.5 v , -40c t a +125c 40 150 ppm / v load regulation v o / i l i l = -3 ma to +10 ma 12 20 ppm / ma i l = -3 ma to +10 ma , -40c t a +125c 50 ppm / ma quiescent current i q 70 a -40c t a +125c 90 a dropout voltage v do i l = 2 ma, t a = -40c t a +125c 200 mv ripple rejection ratio rrr f in = 10 khz tbd db output current capacity sinking sourcing i l -3 10 ma ma output voltage noise e np-p tbd 17.1 v p-p output voltage noise density e n tbd v rms output voltage hysteresis v out_hys t a = +25c -40c +125c +25c 50 ppm long-term stability v out_ltd 1000 hours @ 25c 50 ppm turn-on settling time t r tbd s
adr3412/3420/3425/3430/3433/3440/3450 preliminary technical data rev. pr b | page 4 of 13 adr3425 electrical characteristics unless otherwise noted, v in = 2.7 to 5.5 v, i l = 0, t a = 25c. table 4. parameter symbol conditions min typ max unit output voltage v out 2.500 v initial accuracy v oerr 0.1 % 2.5 mv temperature coefficient tcv out 10 ppm / c line regulation v o / v in v in = 2.4 v to 5.5 v 5 20 ppm / v v in = 2.4 v to 5.5 v , -40c t a +125c 40 150 ppm / v load regulation v o / i l i l = -3 ma to +10 ma 12 20 ppm / ma i l = -3 ma to +10 ma , -40c t a +125c 50 ppm / ma quiescent current i q 70 a -40c t a +125c 90 a dropout voltage v do i l = 2 ma, t a = -40c t a +125c 200 mv ripple rejection ratio rrr f in = 10 khz tbd db output current capacity sinking sourcing i l -3 10 ma ma output voltage noise e np-p tbd 20.9 v p-p output voltage noise density e n tbd v rms output voltage hysteresis v out_hys t a = +25c -40c +125c +25c 50 ppm long-term stability v out_ltd 1000 hours @ 25c 50 ppm turn-on settling time t r tbd s adr3430 electrical characteristics unless otherwise noted, v in = 3.2 to 5.5 v, i l = 0, t a = 25c. table 5. parameter symbol conditions min typ max unit output voltage v out 3.000 v initial accuracy v oerr 0.1 % 3.0 mv temperature coefficient tcv out 10 ppm / c line regulation v o / v in v in = 2.4 v to 5.5 v 5 20 ppm / v v in = 2.4 v to 5.5 v , -40c t a +125c 40 150 ppm / v load regulation v o / i l i l = -3 ma to +10 ma 12 20 ppm / ma i l = -3 ma to +10 ma , -40c t a +125c 50 ppm / ma quiescent current i q 70 a -40c t a +125c 90 a dropout voltage v do i l = 2 ma, t a = -40c t a +125c 200 mv ripple rejection ratio rrr f in = 10 khz tbd db output current capacity sinking sourcing i l -3 10 ma ma output voltage noise e np-p tbd 25 v p-p output voltage noise density e n tbd v rms output voltage hysteresis v out_hys t a = +25c -40c +125c +25c 50 ppm long-term stability v out_ltd 1000 hours @ 25c 50 ppm turn-on settling time t r tbd s
preliminary technical data adr3412/3420/3425/3430/3433/3440/3450 rev. pr b | page 5 of 13 ADR3433 electrical characteristics unless otherwise noted, v in = 3.5 to 5.5 v, i l = 0, t a = 25c. table 6. parameter symbol conditions min typ max unit output voltage v out 3.300 v initial accuracy v oerr 0.1 % 3.3 mv temperature coefficient tcv out 10 ppm / c line regulation v o / v in v in = 2.4 v to 5.5 v 5 20 ppm / v v in = 2.4 v to 5.5 v , -40c t a +125c 40 150 ppm / v load regulation v o / i l i l = -3 ma to +10 ma 12 20 ppm / ma i l = -3 ma to +10 ma , -40c t a +125c 50 ppm / ma quiescent current i q 70 a -40c t a +125c 90 a dropout voltage v do i l = 2 ma, t a = -40c t a +125c 200 mv ripple rejection ratio rrr f in = 10 khz tbd db output current capacity sinking sourcing i l -3 10 ma ma output voltage noise e np-p tbd 27.5 v p-p output voltage noise density e n tbd v rms output voltage hysteresis v out_hys t a = +25c -40c +125c +25c 50 ppm long-term stability v out_ltd 1000 hours @ 25c 50 ppm turn-on settling time t r tbd s adr3440 electrical characteristics unless otherwise noted, v in = 4.3 to 5.5 v, i l = 0, t a = 25c. table 7. parameter symbol conditions min typ max unit output voltage v out 4.096 v initial accuracy v oerr 0.1 % 4.1 mv temperature coefficient tcv out 10 ppm / c line regulation v o / v in v in = 2.4 v to 5.5 v 5 20 ppm / v v in = 2.4 v to 5.5 v , -40c t a +125c 40 150 ppm / v load regulation v o / i l i l = -3 ma to +10 ma 12 20 ppm / ma i l = -3 ma to +10 ma , -40c t a +125c 50 ppm / ma quiescent current i q 70 a -40c t a +125c 90 a dropout voltage v do i l = 2 ma, t a = -40c t a +125c 200 mv ripple rejection ratio rrr f in = 10 khz tbd db output current capacity sinking sourcing i l -3 10 ma ma output voltage noise e np-p tbd 34.2 v p-p output voltage noise density e n tbd v rms output voltage hysteresis v out_hys t a = +25c -40c +125c +25c 50 ppm long-term stability v out_ltd 1000 hours @ 25c 50 ppm turn-on settling time t r tbd s
adr3412/3420/3425/3430/3433/3440/3450 preliminary technical data rev. pr b | page 6 of 13 adr3450 electrical characteristics unless otherwise noted, v in = 5.2 to 5.5 v, i l = ? ma, t a = 25c. table 8. parameter symbol conditions min typ max unit output voltage v out 5.000 v initial accuracy v oerr 0.1 % 5.0 mv temperature coefficient tcv out 10 ppm / c line regulation v o / v in v in = 2.4 v to 5.5 v 5 20 ppm / v v in = 2.4 v to 5.5 v , -40c t a +125c 40 150 ppm / v load regulation v o / i l i l = -3 ma to +10 ma 12 20 ppm / ma i l = -3 ma to +10 ma , -40c t a +125c 50 ppm / ma quiescent current i q 70 a -40c t a +125c 90 a dropout voltage v do i l = 2 ma, t a = -40c t a +125c 200 mv ripple rejection ratio rrr f in = 10 khz tbd db output current capacity sinking sourcing i l -3 10 ma ma output voltage noise e np-p 33 41.7 v p-p output voltage noise density e n 5.5 v rms output voltage hysteresis v out_hys t a = +25c -40c +125c +25c 50 ppm long-term stability v out_ltd 1000 hours @ 25c 50 ppm turn-on settling time t r tbd s
preliminary technical data adr3412/3420/3425/3430/3433/3440/3450 rev. pr b | page 7 of 13 absolute maximum ratings t a = 25c, unless otherwise noted. table 9. parameter rating supply voltage 5.5 v operating temperature range -40c to +125c storage temperature range -65c to +125c junction temperature range -65c to +150c 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 10. thermal resistance package type ja jc unit c/w esd caution
adr3412/3420/3425/3430/3433/3440/3450 preliminary technical data rev. pr b | page 8 of 13 pin configuration and fu nction descriptions figure 2. adr34xx pin configuration table 11. pin function descriptions pin no. mnemonic description 1 gnd sense ground sense connection 2 gnd force ground force connection 3 enable enables or disables the device 4 v in input voltage connection 5 v out sense reference voltage output sensing connection (connect directly to the voltage input of load devices) 6 v out force reference voltage output adr34xx top view (not to scale) gnd force v out force v in gnd sense enable v out sense
preliminary technical data adr3412/3420/3425/3430/3433/3440/3450 rev. pr b | page 9 of 13 typical performance characteristics figure 3 figure 4 figure 5 figure 6 figure 7
adr3412/3420/3425/3430/3433/3440/3450 preliminary technical data rev. pr b | page 10 of 13 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 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 normalized by the output voltage at 25c. this parameter is expressed in ppm/c and can be determined by the following equation: 25 10 [ppm/ ] where: v out (25c) = output voltage at 25c v out (t 1 ) = output voltage at temperature 1 v out (t 2 ) = 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: _ 25 _ [v] _ 25 _ 25 10 [ppm] where: v out (25c) = output voltage at 25c v out_tc = output voltage after temperature cycling 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] ? _ 10 [ppm] where, v out (t 0 ) = v out at 25c at time 0 v out (t 1 ) = 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, and is expressed in either percent per volt, ppm per volt, or v 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 v per ma, ppm per ma, or ohms of dc output resistance. this parameter accounts for the effects of self- heating.
preliminary technical data adr3412/3420/3425/3430/3433/3440/3450 rev. pr b | page 11 of 13 theory of operation tbd long-term stability one of the key parameters of the adr34xx 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, non- loaded 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 application note an-713 for more information regarding the effects of long-term drift and how it can be minimized. power dissipation the adr34xx series 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] where, p d = device power dissipation t j = device junction temperature t a = ambient temperature ja = package (junction-to-air) thermal resistance due to 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.
adr3412/3420/3425/3430/3433/3440/3450 preliminary technical data rev. pr b | page 12 of 13 applications basic voltage reference connection (insert circuit diagram) the circuit shown in figure xx illustrates the basic configuration for the adr34xx family. decoupling capacitors should be connected according to the guidelines below. input and output capacitors a 1 f to 10 f electrolytic or ceramic capacitor can 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 in order to reduce supply noise. while the ic will function stably without a capacitor connected to the output, 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 or ceramic capacitor can be added in parallel to improve transient performance in response to sudden changes in load current; however, the designer should keep in mind that doing so will increase the turn-on time of the device.
preliminary technical data adr3412/3420/3425/3430/3433/3440/3450 outline dimensions figure 8. ordering guide model temperature range packag e description package option ?2009 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. pr08440-0-10/09(prb)

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