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general-purpose comparators adcmp370/adcmp371 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 ?2006 analog devices, inc. all rights reserved. features 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 C40c to +85c temperature range 5-lead sc70 packaging applications voltage detectors battery management systems analog-to-digital converters low voltage applications battery-powered electronics portable equipment general description the adcmp370/adcmp371 are general-purpose comparators with input offset voltages of 9 mv (maximum) and low power consumption, which make them ideal for battery-powered, portable equipment. the adcmp371 has a push-pull output stage, while the adcmp370 has an open-drain output. the inputs on both parts 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. functional block diagrams v cc in+ in? 04745-001 adcmp370 gnd out figure 1. v cc in+ in? 04745-002 adcmp371 gnd out figure 2.
adcmp370/adcmp371 rev. a | page 2 of 12 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 revision history 1/06rev. 0 to rev. a changes to features.......................................................................... 1 changes to figure 19........................................................................ 9 changes to figure 20 caption....................................................... 10 updated outline dimensions ....................................................... 11 10/04revision 0: initial version
adcmp370/adcmp371 rev. a | page 3 of 12 specifications v cc = full operating range, 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 voltage 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
adcmp370/adcmp371 rev. a | page 4 of 12 absolute maximum ratings 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 operating 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 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 esd (electrostatic discharge) sensitive device. electros tatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge wi thout detection. although this product features proprietary esd protection circuitry, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd pr ecautions are recommended to avoid performance degradation or loss of functionality.
adcmp370/adcmp371 rev. a | page 5 of 12 pin configuration and fu nction descriptions in+ 04745-003 in? out v cc gnd adcmp370/ adcmp371 1 3 2 4 5 figure 3. pin configuration table 3. pin function descriptions pin o. neonic description 1 in+ noninverting input. 2 gnd ground. 3 inC inverting input. 4 out comparator output. open drain for adcmp370. push-pull for adcmp371. 5 v cc power supply.
adcmp370/adcmp371 rev. a | page 6 of 12 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 . common-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 +125 c t plh +25 c t plh ?40 c figure 5. propagation 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 ? 4 02 5 8 51 temperature ( c) propagation delay ( s) t phl t plh 2 5 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. supply current vs. supply voltage (output low) 0 1.0 2.0 3.0 4.0 1 supply voltage (v) ?40c +25c supply current ( a) 04745-015 6 5 4 3 2 +125c 3.5 2.5 1.5 0.5 figure 9. supply current vs. supply voltage (output high)
adcmp370/adcmp371 rev. a | page 7 of 12 0 100 200 300 400 500 600 700 800 900 1000 sink current (ma) 04745-016 05 3 2 1 output low voltage (mv) 4 v cc = 3.3v v cc = 5v v cc = 2.25v figure 10. output low vo ltage 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 offset 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
adcmp370/adcmp371 rev. a | page 8 of 12 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
adcmp370/adcmp371 rev. a | page 9 of 12 applications basic comparator in its 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 voltage at out is either high or low, depending on whether in+ is at a higher or lower potential than in?, respectively. the adcmp370 and adcmp371 have different digital output structures. the 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 can 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 avoid excessive power dissipation but small enough to switch logic levels reasonably quickly when the comparator output 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 pmos pull-up and, therefore, does not 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 is decreasing, the threshold is below v ref . the upper input threshold level is given by ( ) r2 r1vr2r1v v cc ref in_hi ?+ = the lower input threshold level is given by ( ) r2 r2r1v v ref in_lo + = the hysteresis is the difference between these voltage levels r2 r1v v cc in = in the example in figure 19 , resistor r1 and resistor r2 are chosen to give 1 v hysteresis about the reference of 2.5 v, with v cc = 5 v. adm331 adcmp371 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 comparator configuration with hysteresis with the inverting configuration, the upper and lower switching thresholds are () r2r3r1 r2 v v cc in_hi + = || () )()1()( 1 r3r2rr2r3r1 r3rr2v v cc in_hi ++ + = ( ) () r3r2r1 r3r2v v cc in_lo || || + = )3()()3( 32 rr2r1r2rr1 rrv v cc in_lo ++ =
adcmp370/adcmp371 rev. a | page 10 of 12 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 r3r2 r load r2 = 1m r3 = 1m r1 = 1m v in v out high: v out low: figure 20. inverting comparator configuration with hysteresis
adcmp370/adcmp371 rev. a | page 11 of 12 outline dimensions compliant to jedec standards mo-203-aa 0.30 0.15 0 . 1 0 m a x 1.00 0.90 0.70 0.46 0.36 0.26 seating plane 0.22 0.08 1.10 0.80 4 5 123 pin 1 0.65 bsc 2.20 2.00 1.80 2.40 2.10 1.80 1.35 1.25 1.15 0.10 coplanarity 0.40 0.10 figure 21. 5-lead thin shrink small outline transistor package [sc70] (ks-5) dimensions shown in millimeters ordering guide model temperature range package 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 adcmp370aksz-reel 1 ? 40c to +85c 5-lead sc70 ks-5 m8p ADCMP370AKSZ-REEL7 1 ? 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 adcmp371aksz-reel7 1 ? 40c to +85c 5-lead sc70 ks-5 m8w 1 z = pb-free part.
adcmp370/adcmp371 rev. a | page 12 of 12 notes ?2006 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d04745-0-1/06(a)

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