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high voltage , current shunt monitor data sheet ad8215 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 ? 2008 - 2011 analog devices, inc. all rights reserved. features 4000 v hbm esd high common - mode voltage range ?2 v to +65 v operating ?3 v to +68 v survival buffered output voltage wide operating temperature range 8 - lead soic _n : ? 40 c to +125c excellent ac and dc performance 6 v/c typical offset drift ? 8 ppm/c typical gain drift 120 d b typical cmrr at dc applications high - side current sensing motor controls transmission controls engine management suspension controls vehicle dynamic controls d c - to - dc converters qualified for automotive applications funct ional block diagram 07203-001 in+ v+ out g = +20 ad8215 a1 proprie t ar y offset circuit r y in? gnd figure 1. general description the ad8215 is a high voltage, precision current shunt monito r. it features a set ga in of 20 v/v, with a maximum 0.3 % gain error over the entire temperature range. the buffered output voltage directly interfaces with any typical converter. excellent common - mode rejection from ?2 v to +65 v is independent of the 5 v supply. the ad8215 per forms unidirectional current measurements across a shunt resistor in a variety of industrial and automotive applications , such as motor control s , solenoid control s , or battery management. special circuitry is devoted to output linearity being maintained t hroughout the input differential voltage range of 0 mv to 250 m v, regardless of t he common - mode voltage present. the ad8215 has an operating temperature range of ? 40 c to +125 c and is offered in a small 8 - l ead soic _n package .
ad8215 data sheet rev. a | page 2 of 16 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 ? application notes ........................................................................... 11 ? output linearity ......................................................................... 11 ? applications information .............................................................. 12 ? high-side current sensing with a low-side switch ............. 12 ? high-side current sensing ....................................................... 12 ? low-side current sensing ........................................................ 12 ? outline dimensions ....................................................................... 13 ? ordering guide .......................................................................... 13 ? automotive products ................................................................. 13 ? revision history 10/11rev. 0 to rev. a change to applications section ...................................................... 1 updated outline dimensions ....................................................... 13 changes to ordering guide .......................................................... 13 added automotive products section .......................................... 13 1/08revision 0: initial version
data sheet ad8215 rev. a | page 3 of 16 specifications t opr = ? 40 c to +125 c, t a = 25 c , v s = 5 v, r l = 25 k ? (r l is the out put load resistor) , unless otherwise noted . table 1 . parameter min typ max unit conditions gain initial 20 v/v accuracy 0. 15 % v o 0.1 v dc , t a accuracy over temperature 0.3 % t opr drift 0 ? 8 ? 15 ppm/ c t opr voltage offset offset voltage , rti 1 mv t a over temperature , rti 2.5 mv t opr drift ?15 +6 + 1 8 v/ c t opr input input impedance differential 5 k ? common mode 5 m? common - mode v oltage > 5 v 3.5 k? common - mode v oltage < 5 v common - mode input voltage range ?2 +65 v common - mode continuous differential input voltage range 250 mv differential input voltage common - mode rejection ratio 100 120 db t opr , f = dc t o 5 0 khz , v cm > 5 v 80 90 db t opr , f = dc to 4 0 khz , v cm < 5 v output output voltage range low 0.03 v t a 0.10 v t opr output voltage range high 4.95 v t a 4.90 v t opr output impedance 2 ? dynamic response small signal ?3 db bandwidth 450 khz t opr slew rate 4.5 v/s t a noise 0.1 hz to 10 hz, rti 7 v p -p spectral density, 1 khz, rti 70 nv/ hz power supply operating range 4.5 5.5 v quiescent current over temper a ture 1.3 2.2 ma v cm > 5 v 1 , t opr pow er supply rejection ratio 75 db t opr temperature range for specified performance ?40 +125 c 1 when the input common - mode voltage is less than 5 v, the supply current increases, which can be calculated by i s = ? 0.275 (v cm ) + 2.5.
ad8215 data sheet rev. a | pag e 4 of 16 absolute maximum rat ings table 2 . parameter rating supply voltage 12.5 v continuous input voltage ?3 v to +68 v continuo us differential input voltage 0.5 v reverse supply voltage ? 0.3 v human body m odel (hbm ) esd rating 4000 v charged device model ( cdm ) esd rating 1000 v operating temperature range ?40 c to +125c storage temperature range ?65c to +150c output sho rt - 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
data sheet ad8215 rev. a | page 5 of 16 pin configuration an d function descripti ons 07203-002 5 1 2 5 6 8 figure 2 . metallization diagram ?in 1 gnd 2 nc 3 nc 4 +in 8 nc 7 v+ 6 out 5 nc = no connect ad8215 t op view (not to scale) 07203-003 figure 3 . pin configuration table 3 . pin function descriptions pin o. neonic description 1 ? in ? 228 + 519 inverting input. 2 gnd ? 273 ? 251 ground. 3 , 4, 7 n c n/a n/a no connect. 5 out + 265 ? 466 buffered output. 6 v+ + 273 ? 266 supply. 8 +in + 229 + 519 noninverting input.
ad8215 data sheet rev. a | page 6 of 16 typical performance characteristics ?1.2 ?1.0 ?0.8 ?0.6 ?0.4 ?0.2 0 0.4 0.2 0.6 0.8 1.0 1.2 ?40 ?20 0 20 40 60 80 100 120 07203-017 temperature (c) v osi (mv) figure 4 . typical offset drift vs. temperature 07203-024 frequency (hz) cmrr (db) 60 70 80 90 100 110 120 130 140 10 100 1k 10k 100k 1m common-mode vo lt age >5v common-mode vo lt age <5v figure 5 . typical cmrr vs. frequency ?2500 ?2000 ?1500 ?1000 ?500 0 500 1000 1500 2000 2500 ?40 ?20 0 20 40 60 80 100 120 07203-016 temperature (c) gain error (ppm) figure 6 . typical gain error vs. temperature ?40 ?35 ?30 ?25 ?20 ?15 ?10 ?5 0 5 10 15 20 25 30 35 40 10k 100k 1m 10m 07203-018 frequency (hz) gain (db) figure 7 . typical small signal bandwidth (v out = 200 mv p - p) 0 1 2 3 4 5 6 7 8 9 10 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 differential input voltage (mv) total output error (%) 250 07203-022 figure 8 . total ou tput error vs. differential input voltage ?570 ?560 ?550 ?540 ?530 ?520 ?510 ?500 ?490 ?480 v in+ v in? 0 25 50 75 100 125 150 175 200 225 250 07203-007 differential input voltage (mv) input bias current (a) figure 9 . input bias current vs. differential input voltage, v cm = 0 v
data sheet ad8215 rev. a | page 7 of 16 40 50 60 70 80 90 100 110 120 0 25 50 75 100 125 150 175 200 225 250 in+ in? 07203-006 differential input voltage (mv) input bias current (a) figure 10 . input bias current vs. differential input voltage, v cm = 5 v ?2.4 ?2.0 ?1.6 ?1.2 ?0.8 ?0.4 0 0.4 0.8 ?4 ?2 0 2 4 6 8 65 07203-004 input common-mode voltage (v) input bias current (ma) figure 11 . input bias current vs. input common - mode voltage 1.0 1.5 2.0 2.5 3.0 3.5 4.0 ?4 ?2 0 2 4 6 8 65 07203-005 input common-mode voltage (v) supply current (ma) figure 12 . supply current vs. common - mode voltage time (400ns/div) 07203-012 2 1 100mv/div input output 1v/div figure 13 . fall time time (400ns/div) 07203-015 2 1 100mv/div input output 1v/div figure 14 . rise time time (1s/div) 07203-013 2 1 200mv/div input output 2v/div figure 15 . differential overload recovery (falling)
ad8215 data sheet rev. a | page 8 of 16 time (1s/div) 07203-014 2 1 200mv/div input output 2v/div figure 16 . differential overload recovery (rising) time (4s/div) 07203-019 2 1 2v/div 0.01%/div figure 17 . settling time (falling) time (4s/div) 07203-020 2 1 2v/div 0.01%/div figure 18 . settling time (rising) 5 6 7 8 9 10 11 12 ?40 ?20 0 20 40 60 80 100 120 140 07203-010 temperature (c) maximum output sink current (ma) figure 19 . maximum output sink current vs. temperature 4 5 6 7 8 9 10 ?40 ?20 0 20 40 60 80 100 120 140 07203-011 temperature (c) maximum output source current (ma) figure 20 . maximum output source current vs. temperature 1.0 1.4 1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 0 1 2 3 4 5 6 7 8 9 07203-008 output source current (ma) output voltage range (v) figure 21 . o utput voltage range vs. output source current
data sheet ad8215 rev. a | page 9 of 16 0 0.4 0.8 1.2 1.6 2.0 0 1 2 3 4 5 6 7 8 9 10 11 12 07203-009 output sink current (ma) output voltage range (v) figure 22 . output voltage range from gnd vs. output sink current 07203-021 v os (mv) count 0 ?2 0 ?1 1 2 500 1000 1500 2000 2500 3000 3500 +125c +25c ?40c figure 23 . offset distribution 07203-023 gain drift (ppm/c) count 0 ?2 ?4 ?6 ?8 ?10 ?12 ?14 ?16 0 300 600 900 1200 1500 1800 2100 2400 figure 24 . gain drift di stribution 07203-030 offset drift (v/c) count 0 15 10 5 0 ?5 ?10 ?15 ?20 20 200 400 600 800 1000 1200 1400 1600 figure 25 . offset drift
ad8215 data sheet rev. a | page 10 of 16 theory of o peration in typical applications, the ad8215 amplifies a small differential input voltage generated by the load current flowing t hrough a shunt resistor. the ad8215 rejects high common - mode voltages (up to 65 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 ad8215 . 07203-025 v+ out = (i shunt r shunt ) 20 g = +20 ad8215 a1 r1 r out i in r proprie t ar y offset circuit r y gnd i shunt r shunt figure 26 . simplified schematic a load current flowing through the external shunt resistor produces a v oltage at the input terminals of the ad8215 . the inpu t terminals are connected to a1 by r and r1 . the inverting terminal, which has ver y high input impedance , is held to ( v cm ) ? ( i shunt r shunt ) because negligible current flows through r . a1 forces the non inverting input to the same potential. theref ore, the current that flows through r1 is equal to i in = ( i shunt r shunt )/ r1 this current (i in ) is converted back to a voltage via r out . the output buffer amplifier has a gain of 20 v/v and offers excellent accuracy as the internal gain setting resistors are precision trimmed to w ithin 0.01% matching. the resul ting output voltage is equal to out = ( i shunt r shunt ) 20
data sheet ad8215 rev. a | page 11 of 16 applic ation notes output linearity in all current sensing applications, and especially in automotive and industrial environments where the common - mode voltage can vary significantly, it is important that the current sensor maintain the specified output linearit y , regardless of the input differential or common - mode voltage. the ad8215 contains specific circuitry on the input stage, which ensures that even when the differential input voltage is very small and the commo n - mode voltage is also low (below the 5 v supply), the input - to - output linearity is maintained. figure 27 shows the differential input voltage vs . the corresponding output voltage at different common modes. 20 0 0 0 07203- 026 d i ff e r e n t i a l i n p u t v o lt a g e ( m v) output voltage (mv) 1 0 18 0 16 0 14 0 12 0 10 0 8 0 6 0 4 0 2 0 1 2 3 4 5 6 7 8 9 i d e a l v o u t (m v) v o u t (m v) @ v c m = 0 v v o u t (m v) @ v c m = 65 v figu re 27 . gain linearity due to d ifferential and common - mode voltage regardless of the common mode, t he ad8215 provides a correct output voltage when the differential input is at least 2 mv , which is due to the voltage range of the output amplifier that can go as low as 33 mv typical. the specified minim um output amplifier voltage is 10 0 mv to provide sufficient guard - bands. the ability of the ad8215 to work with very small differential inputs , regardless of the common - mode voltage, allows for more dynamic range, accuracy, and flexibility in any current sensing application.
ad8215 data sheet rev. a | page 12 of 16 a pplications information high - side current sens ing with a low - side switch in such l oad control configurations , the pwm - controlled switch is ground referenced. an inductive load (solenoid) is tied to a power supply. a resistive shunt is placed between the switch a nd the load (see figure 28 ). an advantage of placing the shunt on the high side is that the entire current, including the recirculatio n current, can be mea s ured because the shunt remains in the loop when the switch is off. in addition, diagnostics can be enhanced because shorts to ground can be detected with the shunt on the high side. in this circuit configuration, when the switch is closed, the common - mode voltage moves down to near the negative rail. when the switch is opened, the voltage reversal across the i n ductive l oad causes the common - mode voltage to be held one diode drop above the battery by the clamp diode. 07203-027 inductive load clam p diode shunt switch ba tte r y 5 4 5v 8 7 6 2 3 5 1 4 nc v+ in+ in? out nc nc gnd ad8215 figure 28 . low - side switch high - side current sensing in this configuration, the shunt resistor is referenced to the battery. high voltage is present at the inputs of the current sense amplifier. in this mode, the recirculation current is again measured and sho rts to ground can be detected. when the shunt is battery referenced , the ad8215 produces a linear ground - referenced analog output. an ad821 4 can also be used to provide an over - current detection signal in a s little as 100 n s (see figure 29) . this fe ature is useful in high current syste ms where fast shutdown in over - current conditions is essential. 07203-028 5 4 5v inductive load clam p diode shunt switch ba tte r y 1 2 3 4 8 7 6 5 ad8214 gnd nc ?in out v reg +in v s nc overcurrent detection (<100ns) 5 6 7 3 2 8 4 1 nc v+ in+ in? out nc nc gnd ad8215 figure 29 . battery - referenced shunt resistor low - side current sensing in systems where low - side current sensing is preferred, th e ad8215 provide s an integrated solution with great accuracy. ground noise is re jected, cmrr is typical ly higher than 90 db , and output linearity is not compromised , regardless of the input differential voltag e. 07203-029 inductive load clam p diode shunt ba tte r y switch 5 4 5v 5 6 7 3 2 8 4 1 nc v+ in+ in? out nc nc gnd ad8215 figure 30 . ground - reference d shunt resistor
data sheet ad8215 rev. a | page 13 of 16 outline dimensions controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. compliant to jedec standards ms-012-aa 012407-a 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 4 1 85 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) bsc 6.20 (0.2441) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarity 0.10 figure 31. 8-lead standard small outline package [soic_n] narrow body (r-8) dimensions shown in millimeters and (inches) ordering guide model 1, 2 temperature range package description package option ad8215yrz ?40c to +125c 8-lead soic_n r-8 ad8215yrz-rl ?40c to +125c 8-lead soic_n, 13 tape and reel r-8 ad8215yrz-r7 ?40c to +125c 8-lead soic_n, 7 tape and reel r-8 AD8215WYRZ ?40c to +125c 8-lead soic_n r-8 AD8215WYRZ-r7 ?40c to +125c 8-lead soic_n, 7 tape and reel r-8 AD8215WYRZ-rl ?40c to +125c 8-lead soic_n, 13 tape and reel r-8 1 z = rohs compliant part. 2 w = qualified for auto motive applications. automotive products the AD8215WYRZ models are available with controlled manufacturing to support the quality and reliability requirements of automo tive applications. note that these automotive models may have specifications that differ from the commercial models; therefore desig ners should review the specifications section of this data sheet carefully. only the automotive grade products shown are available f or use in automotive applications. contact your local analog devices account representative for specific product ordering information and to obtain the specific automotive reliability reports for these models.
ad8215 data sheet rev. a | page 14 of 16 notes
data sheet ad8215 rev. a | page 15 of 16 notes
ad8215 data sheet rev. a | page 16 of 16 notes ? 2008 - 2011 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d07203 - 0 - 10/11(a)

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