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zero drift, unidirectional current shunt monitor ad8219 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 ?2011 analog devices, inc. all rights reserved. features high common-mode voltage range 4 v to 80 v operating ?0.3 v to +85 v survival buffered output voltage gain = 60 v/v wide operating temperature range: ?40c to +125c excellent ac and dc performance 100 nv/c typical offset drift 50 v typical offset 5 ppm/c typical gain drift 110 db typical cmrr at dc applications high-side current sensing 48 v telecom power management base stations unidirectional motor control precision high voltage current sources functional block diagram ldo r2 r1 ad8219 r4 r3 +in v s ?in out gnd 09415-001 figure 1. general description the ad8219 is a high voltage, high resolution, current shunt amplifier. it features a set gain of 60 v/v, with a maximum 0.3% gain error over the entire temperature range. the buffered output voltage directly interfaces with any typical converter. the ad8219 offers excellent input common-mode rejection from 4 v to 80 v. the ad8219 performs unidirectional current measurements across a shunt resistor in a variety of industrial and telecom applications including motor control, power management, and base station power amplifier bias control. the ad8219 offers breakthrough performance throughout the ?40c to +125c temperature range. it features a zero drift core, which leads to a typi cal offset drift of 100 nv/c throughout the operating temperature and common-mode voltage range. special attention is devoted to output linearity being maintained throughout the input differential voltage range, regardless of the common-mode voltage present, while the typical input offset voltage is 50 v. the ad8219 is offered in a 8-lead msop package.
ad8219 rev. a | page 2 of 12 table of contents features .............................................................................................. 1 ? applications....................................................................................... 1 ? functional block diagram .............................................................. 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications..................................................................................... 3 ? absolute maximum ratings............................................................ 4 ? esd caution.................................................................................. 4 ? pin configuration and function descriptions............................. 5 ? typical performance characteristics ............................................. 6 ? theory of operation ...................................................................... 10 ? amplifier core............................................................................ 10 ? supply connections ................................................................... 10 ? output clamping ....................................................................... 10 ? output linearity......................................................................... 10 ? applications information .............................................................. 11 ? high-side current sensing ....................................................... 11 ? motor control current sensing ............................................... 11 ? outline dimensions ....................................................................... 12 ? ordering guide .......................................................................... 12 ? revision history 2/11rev. 0 to rev. a changes to features section............................................................ 1 changes to amplifier core section ............................................. 10 moved output linearity section into theory of operation section.............................................................................................. 10 1/11revision 0: initial version
ad8219 rev. a | page 3 of 12 specifications t opr = ?40c to +125c, t a = 25c, r l = 25 k, input common-mode voltage (v cm ) = 4 v (r l is the output load resistor), unless otherwise noted. table 1. parameter min typ max unit test conditions/comments gain initial 60 v/v accuracy 0.1 % v o 0.1 v dc, t a accuracy over temperature 0.3 % t opr gain vs. temperature 5 ppm/c t opr voltage offset offset voltage (rti 1 ) 200 v 25c over temperature (rti 1 ) 300 v t opr offset drift 100 nv/c t opr input bias current 2 130 a t a , input common mode = 4 v, v s = 4 v 220 a t opr common-mode input voltage range 4 80 v common-mode continuous differential input voltage range 3 0 83 mv differential input voltage common-mode rejection (cmrr) 94 110 db t opr output output voltage range low 4 0.01 v t a output voltage range high 4 v s ? 0.1 v t a output impedance 2 dynamic response small signal ?3 db bandwidth 500 khz slew rate 1 v/s noise 0.1 hz to 10 hz, (rti 1 ) 2.3 v p-p spectral density, 1 khz, (rti 1 ) 110 nv/hz power supply operating range 4 80 v v s input range quiescent current over temperature 5 800 a power supply rejection ratio (psrr) 100 110 db t opr temperature range for specified performance ?40 +125 c 1 rti = referred to input. 2 refer to for further information on the input bias current. th is current varies based on the input common-mode voltag e. additionally, the input bias current flowing to the +in pin is also the supply current to the internal ldo. figure 8 3 the differential input voltage is specifie d as 83 mv maximum because the output is i nternally clamped to 5.6 v. see the output section. clamping 4 see and for further information on the output range of the ad8219 with various loads. the ad8219 output cl amps to a maximum voltage of 5.6 v when the voltage at pin +in is greater than 5.6 v. when the volt age at +in is less than 5.6 v, the output reaches a maximum val ue of (v s ? 100 mv). figure 19 figure 20 5 v s (pin 2) can be connected to a separate supply ranging from 4 v to 80 v, or it can be connected to the positive input pin (+in) of the ad8219. in this mode, the current drawn varies with increasing voltage. see . figure 9
ad8219 rev. a | page 4 of 12 absolute maximum ratings table 2. parameter rating maximum input voltage ( +in, ?in to gnd) ?0.3 v to +85 v differential input voltage (+in to Cin) 5 v human body model (hbm) esd rating 1000 v operating temperature range (t opr ) ?40c to +125c storage temperature range ?65c to +150c output short-circuit duration indefinite 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. esd caution
ad8219 rev. a | page 5 of 12 pin configuration and fu nction descriptions +in 1 v s 2 nc 3 g nd 4 ?in 8 nc 7 nc 6 out 5 nc = no connect. do not connect to this pin. ad8219 top view (not to scale) 09415-002 figure 2. pin configuration table 3. pin function descriptions pin o. neonic description 1 +in noninverting input. 2 v s supply pin. bypass with a standard 0.1 f capacitor. 3 nc do not connect to this pin. 4 gnd ground. 5 out output. 6 nc do not connect to this pin. 7 nc do not connect to this pin. 8 ?in inverting input.
ad8219 rev. a | page 6 of 12 typical performance characteristics ? 19.0 ?19.5 ?20.0 ?20.5 ?21.0 ?21.5 ?22.0 ?22.5 ?23.0 ?23.5 ?24.0 ?40 140120 100 80604020 0 ?20 v os (v) temperature (c) 09415-121 figure 3. typical input offset vs. temperature 120 50 60 70 80 90 100 110 100 1m 100k 10k 1k cmrr (db) frequency (hz) 09415-104 figure 4. typical cmrr vs. frequency 0 ?50 ?100 ?150 ?200 ?250 ?300 ?350 ?400 ?450 ?500 ?40 140120 100 80 60 4020 0 ?20 gain error (ppm) temperature (c) 09415-120 figure 5. typical gain error vs. temperature 40 ?40 ?30 ?20 ?10 0 10 20 30 1k 10m 1m 100k 10k magnitude (db) frequency (hz) 09415-105 figure 6. typical small signal bandwidth (v out = 200 mv p-p) 7 ?2 ?1 1 0 2 3 4 5 6 01 987654321 typical output error (%) differential input voltage (mv) 09415-128 0 figure 7. typical output error vs. differential input voltage 300 250 200 150 100 50 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 input bias current (a) input common-mode voltage (v) +in ?in 09415-101 figure 8. input bias current vs. input common-mode voltage (differential input voltage = 5 mv) (v s = 5 v)
ad8219 rev. a | page 7 of 12 550 500 450 400 350 300 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 supply current (a) supply voltage (v) 09415-102 v cm = 5v v cm = 80v figure 9. typical supply current vs. supply voltage (v s connected to +in) 550 200 250 300 350 400 450 500 ?40 ?20 0 140120 100 80 60 4020 supply current (a) temperature (c) 09415-103 figure 10. typical supply current change over temperature (v s = 5 v) 1s/div input 5mv/div output 200mv/div 09415-109 figure 11. rise time (differential input = 5 mv) 5s/div input 50mv/div output 2v/div 09415-110 figure 12. rise time (differential input = 50 mv) 1s/div input 5mv/div output 200mv/div 09415-111 figure 13. fall time (differential input = 5 mv) 5s/div input 50mv/div output 2v/div 09415-112 figure 14. fall time (differential input = 50 mv)
ad8219 rev. a | page 8 of 12 5s/div input 100mv/div output 2v/div 09415-113 figure 15. differential overload recovery, falling 5s/div input 100mv/div output 2v/div 09415-114 figure 16. differential overload recovery, rising 12 10 11 9 8 7 6 5 ?40 120 100 80 604020 0 ?20 maximum output sink current (ma) temperature (c) 09415-107 figure 17. maximum output sink current vs. temperature 7.0 6.5 6.0 5.5 5.0 4.5 4.0 ?40 120 100 80 604020 0 ?20 maximum output source current (ma) temperature (c) 09415-108 figure 18. maximum output source current vs. temperature 5.0 4.8 4.5 4.3 4.0 3.8 3.0 3.3 3.5 03 2.5 2.0 1.5 1.0 0.5 output voltage from rail (v) source current (ma) . 0 ?40c +25c +125c 09415-106 figure 19. output voltage range vs. output source current (v s = 5 v) 0.40 0.35 0.30 0.25 0.20 0.15 0 0.05 0.10 04 3.5 3.0 2.5 2.0 1.5 1.0 0.5 output voltage from ground (v) sink current (ma) . 0 ?40c +25c +125c 09415-129 figure 20. output voltage range from ground vs. output sink current (v s = 5 v)
ad8219 rev. a | page 9 of 12 2s/div input common mode 50v/div output 200mv/div 09415-115 figure 21. common-mode step response (falling) 1s/div input common mode 50v/div output 200mv/div 09415-116 figure 22. common-mode step response (rising) 50 40 30 20 10 0 ?150 150 100 50 0 ?50 ?100 count v osi (v) 09415-118 figure 23. input offset distribution 70 60 50 40 30 20 10 0 ?6 6 4 2 0 ?2 ?4 count gain drift (ppm/c) 09415-119 figure 24. gain drift distribution 35 0 5 10 15 20 25 30 ?0.6 0.6 0.4 0.2 0 ?0.2 ?0.4 count offset drift (v/c) 09415-117 figure 25. input offset drift distribution
ad8219 rev. a | page 10 of 12 theory of operation amplifier core in typical applications, the ad8219 amplifies a small differential input voltage generated by the load current flowing through a shunt resistor. the ad8219 rejects high common-mode vol- tages (up to 80 v) and provides a ground referenced, buffered output that interfaces with an analog-to-digital converter (adc). figure 26 shows a simplified schematic of the ad8219. ldo r2 r1 ad8219 r4 r3 +in v s ?in out gnd load v 2 i load v 1 shunt 4v to 80v gnd 4v to 80v 09415-024 figure 26. simpli fied schematic the ad8219 is configured as a difference amplifier. the transfer function is out = ( r4 / r1 ) ( v 1 ? v 2 ) resistors r4 and r1 are matched to within 0.01% and have values of 1.5 m and 25 k, re spectively, meaning an input to output total gain of 60 v/v for the ad8219, while the difference at v 1 and v 2 is the voltage across the shunt resistor or v in . therefore, the input-to-outpu t transfer function for the ad8219 is out = (60) ( v in ) the ad8219 accurately amplifies the input differential signal, rejecting high voltage common modes ranging from 4 v to 80 v. the main amplifier uses a novel ze ro drift architecture, providing the end user with breakthrough temperature stability. the offset drift is typically less than 100 nv/c. this performance leads to optimal accuracy and dynamic range. supply connections the ad8219 includes an internal ldo, which allows the user to connect the v s pin to the inputs, or use a separate supply at pin 2 (v s ) to power the device. the input range of the supply pin is equivalent to the input common-mode range of 4 v to 80 v. the user must ensure that v s is always connected to the +in pin or a separate low impedance supply, which can range from 4 v to 80 v. the v s pin should not be floating. output clamping when the input common-mode voltage in the application is above 5.6 v, the internal ldo output of the ad8219 also reaches its maximum value of 5.6 v, which is the maximum output range of the ad8219. because in typical applications the output interfaces with a converter, clamping the ad8219 output voltage to 5.6 v ensures the adc input is not damaged due to excessive overvoltage. output linearity in all current sensing applications where the common-mode voltage can vary significantly, it is important that the current sensor maintain the specified output linearity, regardless of the input differential or common-mode voltage. the ad8219 maintains a very high input-to-output linearity even when the differential input voltage is very small. 0.7 0 0.1 0.2 0.3 0.4 0.5 0.6 01 987654321 output voltage (v) differential input voltage (mv) 09415-127 0 figure 27. typical gain linearity at small differential inputs (v cm = 4 v to 80 v) regardless of the common mode, the ad8219 provides a correct output voltage when the input differential is at least 1 mv. the ability of the ad8219 to work with very small differential inputs, regardless of the common-mode voltage, allows for optimal dynamic range, accuracy, and flexibility in any current sensing application.
ad8219 rev. a | page 11 of 12 applications information high-side current sensing in this configuration, the shunt resistor is referenced to the battery (see figure 28 ). high voltage is present at the inputs of the current sense amplifier. when the shunt is battery referenced, the ad8219 produces a linear ground referenced analog output. +in i load shunt gnd ?in 4v to 8 0v ad8219 out v s 09415-026 load figure 28. battery referenced shunt resistor figure 28 shows the supply pin, v s , connected directly to the positive input (+in) pin. in this mode, the internal ldo powers the ad8219 as long as the common-mode voltage at the input pins is 4 v to 80 v. additionally, v s can also be connected to a standalone supply that can vary from 4 v to 80 v as shown in figure 29 . +in i load shunt gnd ?in ad8219 out v s 4v to 8 0v 4v to 8 0v 09415-029 load figure 29. standalo ne supply operation motor control current sensing the ad8219 is a practical, accurate solution for high-side current sensing in motor control applications. in cases where the shunt resistor is referenced to a battery and the current flowing is unidirectional (as shown in figure 30 ), the ad8219 monitors the current with no additional supply pin necessary provided the battery voltage in the following circuit is in the 4 v to 80 v range. +in gnd ?in battery motor i motor ad8219 out v s 09415-027 figure 30. high-side current sensing in motor control
ad8219 rev. a | page 12 of 12 outline dimensions compliant to jedec standards mo-187-aa 6 0 0.80 0.55 0.40 4 8 1 5 0.65 bsc 0.40 0.25 1.10 max 3.20 3.00 2.80 coplanarity 0.10 0.23 0.09 3.20 3.00 2.80 5.15 4.90 4.65 pin 1 identifier 15 max 0.95 0.85 0.75 0.15 0.05 10-07-2009-b figure 31. 8-lead mini small outline package [msop] (rm-8) dimensions shown in millimeters ordering guide model 1 temperature range package description package option branding AD8219BRMZ ?40c to +125c 8-lead mini small outline package [msop] rm-8 y3s AD8219BRMZ-rl ?40c to +125c 8-lead mini small outline package [msop] rm-8 y3s 1 z = rohs compliant part. ?2011 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d09415-0-2/11(a)

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