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general - purpose comparators data sheet adcmp370 / adcmp371 f eatures 2.25 v to 5.5 v operating voltage range low power consumption (4 a) high voltage (22 v) tolerance on inputs output stages adcmp370 : open - drain, high voltage (22 v tolerance) adcmp371 : push - pull 50 na input bias current 150 na input offset current 9 mv input offset voltage rail - to - rail , common - mode input range specified over C 40c to +85c temperature range 5 - lead sc 70 packaging a pplications voltage detectors battery management systems analog - to - digital converters low voltage applications battery - powered electronics portable equipment g eneral description the adcmp370 / adcmp371 are general - purpose comparators with input offset voltages of 9 mv (max imum ) and low power consumption , which make them ideal for battery - powered , portable eq uipment. the adcmp371 has a push - pull output stage, while the adcmp370 has an open - drain output. the inputs on both pa rts and the output on the adcmp370 can tolerate voltages up to 22 v, making them suitable for use as voltage detectors in portable equipment. the devices are available in space - efficient , 5 - lead sc70 packaging. f unctional block diag rams v cc in+ in? 04745-001 adcmp370 gnd out figure 1 . v cc in+ in ? 04745-002 adcmp371 gnd out figure 2 . rev. d document feedback information f urnished 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 subj ect 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, nor wood, ma 02062 - 9106, u.s.a. tel: 781.329.4700 ? 2004C 2014 analog devices, inc. all rights reserved. technical support www.analog.com
adcmp370/adcmp371 data sheet table of contents features .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 functional block diagrams ............................................................. 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 4 esd caution .................................................................................. 4 pin configuration and function descriptions ..............................5 typical performance characteristics ..............................................6 applications ........................................................................................9 basic comparator ..........................................................................9 adding hysteresis ..........................................................................9 outline dimensions ....................................................................... 11 ordering guide .......................................................................... 11 r evision history 6 /14 rev. c to rev. d change to adding hysteresis section .......................................... 10 8/ 13 rev . b to rev. c changes to v in_hi and v in_lo equations ......................................... 9 3/ 11 rev . a to rev. b changes to figure 19 caption ......................................................... 9 changes to adding hysteresis section .......................................... 9 added figure 21 and figure 22, renumbered sequentially ..... 1 0 updated outline dimensions ....................................................... 11 1/ 06 rev . 0 to rev. a changes to features .......................................................................... 1 changes to figure 19 ........................................................................ 9 changes to figure 20 caption ....................................................... 10 updated outline dimensions ....................................................... 11 10 /04 revision 0: initial version rev. d | page 2 of 12
data sheet adcmp370/adcmp371 specifications v cc = full operating r ange, t a = ? 40c to +85c, unless otherwise noted. table 1. parameter min typ max unit test conditions/comments supply v cc operating voltage range 2.25 5.5 v supply current 4 7 a common - mode input range 0 v cc v input offset vo ltage 9 mv v in = v cc / 2 input offset voltage average drift 5 v/c v cm = 0 v input bias current 50 na v in = v cc / 2 input offset current 150 na v in = v cc / 2 out voltage low 0.4 v in+ < in ?, i sink = 1.2 ma out voltage high ( adcmp371 ) 0.8 v cc v in+ > in ?, i source = 500 a out leakage current ( adcmp370 ) 1 a in+ > in ? , out = 22 v output rise time 30 ns c out = 15 pf output fall time 45 ns c out = 15 pf timing propagation delay 5 s input overdrive = 10 mv 2 s input overdrive = 100 mv rev. d | page 3 of 12
adcmp370/adcmp371 data sheet absolute maximum rat ings t a = 25c , unless otherwise noted . table 2. parameter rating v cc ? 0.3 v to +6 v in+, in ? ? 0.3 v to +25 v out ( adcmp370 ) ? 0.3 v to +25 v out ( adcmp371 ) ? 0.3 v to v cc + 0.3 v operat ing temperature range ? 40c to +85c storage temperature range ? 65c to +150c ja thermal impedance, sc70 146c/ w lead temperature soldering (10 sec) 300c vapor phase (60 sec) 215c infrared (15 sec) 220c stresses above those listed under abso lute 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 rev. d | page 4 of 12
data sheet adcmp370/adcmp371 pin configuration an d function descripti ons in+ 04745-003 in ? out v cc gnd adcmp370/ adcmp371 1 3 2 4 5 figure 3 . pin configuration table 3. pin func tion descriptions pin o. neonic description 1 in+ noninverting input. 2 gnd ground. 3 in C inverting input. 4 out comparator output. open drain for adcmp370 . push -p ull for adcmp371 . 5 v cc power supply. rev. d | page 5 of 12
adcmp370/adcmp371 data sheet typical performance characteristics ? 5 0 5 10 15 20 30 cm i/p (v) offset (mv) 04745-006 0 5.5 1.0 1.5 2.0 4.5 5.0 25 3.5 4.0 2.5 3.0 0.5 figure 4 . input offset vs. commo n- mode input voltage 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 10 20 30 40 50 60 70 80 90 100 110 120 130 input overdrive (mv) propagation delay (s) 04745-007 t plh + 125c t plh +25c t plh ?40c figure 5 . prop agation delay vs. input overdrive (low to high) 0 1 2 3 4 5 6 10 20 30 40 50 60 70 80 90 100 110 120 130 input overdrive (mv) propagation delay ( s) 04745-008 t phl +125 c t phl +25 c t phl ? 40 c figure 6 . propagation delay vs. input overdrive (high to low) 0 0.5 1.0 1.5 2.0 2.5 3.0 ?40 25 85 125 temperature (c) propagation delay (s) t phl t plh 04745-013 figure 7 . propagation delay vs. temperature 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 1 supply voltage (v) +25 c 04745-021 supply current ( a) 5 4 3 2 6 ? 40 c +125 c figure 8 . suppl y current vs. supply voltage (output low) 0 1.0 2.0 3.0 4.0 1 supply voltage (v) ? 40 c +25 c supply current ( a) 04745-015 6 5 4 3 2 +125 c 3.5 2.5 1.5 0.5 figure 9 . supply current vs. supply voltage (output high) rev. d | page 6 of 12
data sheet adcmp370/adcmp371 0 100 200 300 400 500 600 700 800 900 1000 sink current (ma) 04745-016 0 5 3 2 1 output low voltage (mv) 4 v cc = 3.3v v cc = 5v v cc = 2.25v figure 10 . output low voltage vs. sink current ? 3.0 ? 2.6 ? 2.2 ? 1.6 ? 1.0 ? 40 25 125 temperature ( c) offset (mv) v cc = 5v v cc = 3.3v 04745-020 v cc = 2.25v 85 ? 1.2 ? 1.4 ? 1.8 ? 2.0 ? 2.4 ? 2.8 figure 11 . input offs et vs. temperature 0 50 100 150 200 250 300 ? 50 100 150 i out = 2ma i out = 1ma 04745-022 output low voltage (mv) 50 0 temperature ( c) figure 12 . output low voltage vs. temperature i bias (na) ? 100 100 300 500 700 900 5.5 5.2 5.4 5.3 04745-023 v in (v) v cc = 5.5v 5.1 figure 13 . input bias current vs. input voltage 0.80 0.85 0.90 0.95 2.25 2.75 3.25 3.75 4.25 4.75 5.25 5.50 v cc (v) 04745-027 1.05 1.10 1.15 1.20 1.00 hysteresis (mv) figure 14 . hysteresis vs. supply voltage 0 1.0 2.0 3.0 ? 50 0 50 100 150 temperature ( c) 04745-028 hysteresis (mv) v cc = 5v 0.5 1.5 2.5 figure 15 . hysteresis vs. temperature rev. d | page 7 of 12
adcmp370/adcmp371 data sheet 04745-029 ch1 10mv/div ch2 2.00v/div timebase: 3.00 s/div 1 2 ch1 = (in ? ) ? in+ ch2 = out figure 16 . propagation delay timing 10 mv overdrive 04745-030 ch1 100mv/div timebase: 1.00 s/div 1 2 ch2 2.00v/div ch2 = out ch1 = (in ? ) ? in+ figure 17 . propagation delay timing 100 mv overdrive rev. d | page 8 of 12
data sheet adcmp370/adcmp371 applications basic comparator in i ts most basic configuration, a comparator can be used to convert an analog input signal to a digital output signal. the analog signal on in+ is compared to the voltage on in ? , and the volta ge at out is either high or low , depending on whether in+ is at a h igher or lower potential than in ? , respectively. the adcmp370 and adcmp371 have different digital output structures. t he adcmp370 has an open - drain output stage that requires an external resistor to pull out to the logic high voltage level when the output transistor is switched off. this voltage level ca n be as high as 22 v. the same 22 v tolerance also applies to the inputs of the comparators. the pull - up resistor should be large enough to av oid excessive power dissipation but small enough to switch logic levels reasonably quickly when the comparator out put is connected to other digital circuitry. a suitable value is between 1 k? and 10 k ? . the adcmp371 has a push - pull output stage, which has an internal p mos pull - up and , therefore , does no t require an external resistor. faster switching speeds between low and high rails are possible, but the logic high level is limited to v cc . adm331 out v+ v ref t v out 0v adcmp370 v cc v+ v in 04745-017 v ref v in figure 18 . basic comparator and input and output signals adding hysteresis to prevent oscillations at the output caused by noise or slowly moving signals passing the switching threshold, positive feedback can be used to add hysteresis to the differential input. for the noninverting configuration, shown in figure 19 , two resistors are used to create different switching thresholds, depending on whether the input signal is increasing or decreasing in magnitude. when the input voltage is increasing, the threshold is above v ref , and when it i s decreasing, the threshold i s below v ref . the upper input threshold level is given by ( ) r2 r2 r1 v v ref in_hi + = ( ) r2 r1 v r2 r1 v v cc ref in_lo ? + = r2 r1 v v cc in = ? adm331 a d c m p 3 71 v cc = 5v r2 = 1m ? r1 = 200k ? v ref = 2.5v in+ in ? v in v out v in v in_lo = 2v v in_hi = 3v 04745-018 out figure 19 . noninverting adcmp371 comparator configuration with hysteresis with the inverting configuration, the upper and lower switching thresholds are ( ) r2 r3 r1 r2 v v cc in_hi + = || ( ) r3 r2 r r2 r3 r1 r3 r r2 v v cc in_hi + + + = ( ) ( ) r3 r2 r1 r3 r2 v v cc in_lo || || + = r r2 r1 r2 r r1 r r v v cc in_lo + + = rev. d | page 9 of 12
adcmp370/adcmp371 data sheet the hysteresis is the d ifference between these voltage levels and is given by ) ( ) ( ) ( r3 r2 r1 r2 r3 r1 r2 r1 v v cc in + + = ? out v cc = 5v adcmp371 in+ in? 04745-019 v out v in v in_lo = 1.67v v in_hi = 3.33v v cc v cc r3 r1 r2 v in_hi v in_lo r1 r3 r2 r load r2 = 1m ? r3 = 1m ? r1 = 1m ? v in v out high: v out low: figure 20 . i nverting adcmp371 comparator configuration with hysteresis for the adcmp370 configuration, a pull - up resistor is required for the open - drain output, which affect s the hysteresis calcula - tion. the non inverting adcmp370 configuration is shown in fi gure 21 . the upper switching threshold is ( ) r2 r2 r1 + = ref in_hi v v the lower input threshold level is given by ( ) pullup cc pullup r r2 r1 v r r2 r1 + ? + + = ref in_lo v v the hysteresis is the difference betw een these voltage levels pullup r r2 r1 + = ? cc in v v adc m p 3 70 in+ in ? 04745-031 out r1 r2 v in v ref = 2.5v v cc = 5v r pullup r load fi gure 21 . non i nverting adcmp370 comparator configuration with hysteresis the inverting adcmp370 configuration is shown in figure 22 . the upper and lower switching thresholds are ( ) r2 r r3 r1 r2 v v pullup cc in_hi + + = ) ( || ( ) pullup pullup pullup cc in_hi r r3 r2 r1 r2 r r3 r1 r r3 r1 r2 v v + + + + + + = ( ) ( ) pullup pullup cc in_lo r r3 r2 r1 r r3 r2 v v + + + = pullup pullup pullup cc in_lo r r3 r2 r1 r2 r r3 r1 r r3 r2 v v + + + + + = pullup pullup cc in r r3 r2 r1 r2 r r3 r1 r2 r1 v v + + + + = ? adc m p 3 70 in+ in ? 04745-032 out r3 r1 r2 v in v cc = 5v r pullup r load figure 22 . inverting adcmp370 comparator configuration with hysteresis rev. d | page 10 of 12
data sheet adcmp370/adcmp371 outline dimensions 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 o - 2 0 3 - a a 1 . 0 0 0 . 9 0 0 . 7 0 0 . 4 6 0 . 3 6 0 . 2 6 2 . 2 0 2 . 0 0 1 . 8 0 2 . 4 0 2 . 1 0 1 . 8 0 1 . 3 5 1 . 2 5 1 . 1 5 0 7 2 8 0 9 - a 0 . 1 0 m a x 1 . 1 0 0 . 8 0 0 . 4 0 0 . 1 0 0 . 2 2 0 . 0 8 3 1 2 4 5 0 . 6 5 b s c c o p l a n a r i t y 0 . 1 0 s e a t i n g p l a n e 0 . 3 0 0 . 1 5 figure 23 . 5 - lead thin shrink small o utline transistor package [sc70] (ks - 5) dimensions shown in millimeters ordering guide model 1 temperature range p ackage description package option branding adcmp370aks - reel ? 40c to +85c 5- lead sc70 ks -5 m1f adcmp370aks - reel7 ? 40c to +85c 5- lead sc70 ks -5 m1f adcmp370aks z - reel ? 40c to +85c 5- lead sc70 ks -5 m8p adcmp370aks z - reel7 ? 40c to +85c 5- lead sc70 ks -5 m8p adcmp371aks - reel ? 40c to +85c 5- lead sc70 ks -5 m1g adcmp371aks - reel7 ? 40c to +85c 5- lead sc70 ks -5 m1g adcmp371aks z - reel7 ? 40c to +85c 5- lead sc70 ks -5 m8w 1 z = rohs compliant part. rev. d | page 11 of 12
adcmp370/adcmp371 data sheet notes ? 2004 C 2014 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d04745 - 0 - 6/14(d) rev. d | page 12 of 12

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