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dual comparators with 400mv reference and programmable hysteresis preliminary technical data ADCMP341/adcmp343 rev. prd 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 low quiescent current: 6.5 a typ supply range: 1.7v to 5.5v 400mv reference 0.8% accuracy over temperature input range includes ground user programmable hysteresis via resistor string low input bias current: 10na max open drain outputs with 40ma typical sink current supports wired-and connections input polarities: ADCMP341 noninverting adcmp343 inverting small sot-23 package applications battery-powered system monitoring threshold detectors relay driving optoisolator driving handheld instruments general description the ADCMP341/adcmp343 comb ine two low power, low voltage comparators with a 400mv reference in the 5-lead sot-23 package. operating within a supply range of 1.7v to 5.5v, the devices only draw 6.5 a typical, making them ideal for low voltage system monitoring and portable applications. hysteresis is determined using three resistors in a string configuration with the upper and lower tap points connected to the ina_u and ina_l pins of each comparator respectively. the state of the comparators outp ut internally selects which pin is connected to the co mparator inputs. so a change of state in the comparator output will result in one of the inputs being switched in to the comparator and the other being switched out. this will provide the user wi th a fully flexible and simple method of setting the hysteresis. although there are two pins available on each comparator, th ere is only actually one input available externally at any one time, the other inputs are connected internally to the reference. the comparator outputs are open drain with the output stage sinking capability guaranteed greater than 5ma over temperature. the ADCMP341 have noninverting inputs and the adcmp343 have inverting inputs. available in commercial, industrial and automotive temperature ranges. functional block diagram gnd v s outa 400mv outb mux vina ina_u ina_l mux vinb inb_u inb_l ADCMP341 gnd v s outa 400mv outb mux vina ina_u ina_l mux vinb inb_u inb_l adcmp343 figure 1
ADCMP341/adcmp343 preliminary technical data rev. prd | page 2 of 13 table of contents specifications..................................................................................... 3 absolute maximum ratings............................................................ 4 esd caution.................................................................................. 4 pin configuration and function descriptions............................. 5 typical performance characteristics ............................................. 6 applications information ..................................................... 11 comparators and internal reference........................................ 11 programming hysteresis ........................................................... 11 outline dimensions ....................................................................... 12 ordering guide .......................................................................... 12 revision history
preliminary technical data ADCMP341/adcmp343 rev. prd | page 3 of 13 specifications table 1. v cc = 1.7v to 5.5v, -40c t a 125c , unless otherwise noted. note1: r l =100k, v o =2v swing note2: 10mv input overdrive note3: vin = 40mv overdrive note4: r l =10k note5: no load parameter min typ max unit test conditions/comments reference voltage 396.8 400 403.2 mv vs = 1.7v, note1 396.8 400 403.2 mv vs = 5v, note1 reference voltage accuracy 0.8 1.0 % vs = 1.7v, note1 0.8 1.0 % vs = 5v, note1 input bias current 0.01 10 na vs = 1.7v, vin = vs 4 10 na vs = 1.7v, vin = 0.1v output low voltage 60 200 mv vs = 1.7v, iout = 3ma, note2 70 200 mv vs = 5v, iout = 5ma, note2 output leakage current 0.01 1 a vs=1.7v, vout = vs, note3 0.01 1 a vs=1.7v, vout = 5.5v, note3 high-to-low propagation delay 29 s vs = 5v, vol = 400mv, note2,4 low-to-high propagation delay 18 s vs = 5v, voh = 0.9 x vs, note2,4 output rise time 2.2 s vs = 5v, vo = (0.1 to 0.9) x vs, note2,4 output fall time 0.22 s vs = 5v, vo = (0.1 to 0.9) x vs, note2,4 supply current 6.5 10 a vs = 1.7v 6.5 10 a vs = 5.5v
ADCMP341/adcmp343 preliminary technical data rev. prd | page 4 of 13 absolute maximum ratings t a = 25c, unless otherwise noted. table 2. . parameter rating v s ?0.3v to +6v inx ?0.3v to +6v outx ?0.3v to +6v operating temperature range ?40c to +125c 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 and 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. electrosta tic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge with out detection. although this product features proprietary esd protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality.
preliminary technical data ADCMP341/adcmp343 rev. prd | page 5 of 13 pin configuration and fu nction descriptions 1 2 6 8 outb gnd outa ADCMP341 3 +ina_l 7 v s 4 +ina_u 5 +inb_l +inb_u 1 2 6 8 outb gnd outa adcmp343 3 -ina_l 7 v s 4 -ina_u 5 -inb_l -inb_u figure 2. pin configuration table 3. pin function descriptions pin no. mnemonic description 1 outa open drain output for comparator a. capable of sinking up to 40ma of current. 2 ina_u monitors analog input voltage on comparator a. connect to the upper tap point of the resistor string. connected internally to the noninverting input on the ADCMP341 or the inverting pin on the adcmp343 via mux controlled by output level on comparator a. the other input of comparator a is connected to a 400mv reference. 3 ina_l monitors analog input voltage on comparator a. conne ct to the lower tap point of the resistor string. connected internally to the noninverting input on the ADCMP341 or the inverting pin on the adcmp343 via mux controlled by output level on comparator a. the other input of comparator a is connected to a 400mv reference. 4 gnd ground 5 inb_l monitors analog input voltage on comparator b. conn ect to the lower tap point of the resistor string. connected internally to the noninverting input on the ADCMP341 or the inverting pin on the adcmp343 via mux controlled by output level on comparator b. the other input of comparator b is connected to a 400mv reference. 6 inb_u monitors analog input voltage on comparator b. connect to the upper tap point of the resistor string. connected internally to the noninverting input on the ADCMP341 or the inverting pin on the adcmp343 via mux controlled by output level on comparator b. the other input of comparator b is connected to a 400mv reference. 7 vs power supply. operates from 1.7v to 5.5v. 8 outb open drain output for comparator b. capable of sinking up to 40ma of current.
ADCMP341/adcmp343 preliminary technical data rev. prd | page 6 of 13 typical performance characteristics figure 3. distribution of rising input threshold voltage figure 4. ??? figure 5.rising input threshold voltage vs temperature figure 6. distribution of falling input threshold voltage figure 7. rising input threshold voltage vs temperature figure 8.rising input threshold voltage vs supply voltage
preliminary technical data ADCMP341/adcmp343 rev. prd | page 7 of 13 figure 9. ???e figure 10. ??? figure 11. quiescent supply current vs supply voltage figure 12. ??? figure 13. minimum supply voltage figure 14. startup supply current
ADCMP341/adcmp343 preliminary technical data rev. prd | page 8 of 13 figure 15. supply current vs output sink current figure 16 supply current vs output sink current figure 17. supply current vs output sink current figure 18. below ground input bias current figure 19. low level input bias current figure 20 high level input bias current
preliminary technical data ADCMP341/adcmp343 rev. prd | page 9 of 13 figure 21. output saturation voltage vs output sink current figure 22 output saturation voltage vs output sink current figure 23. output saturation voltage vs output sink current figure 24. output short circuit current figure 25. output short circuit current figure 26. output leakage current
ADCMP341/adcmp343 preliminary technical data rev. prd | page 10 of 13 figure 27. propagation delay vs input overdrive figure 28.non inverting and inverting comparators propagation delay figure 29. rise and fall times vs output pullup resistor
preliminary technical data ADCMP341/adcmp343 rev. prd | page 11 of 13 applications information the ADCMP341/3 is a dual low power comparators with a built in 400mv reference that operates from 1.7v to 5.5v. the comparators are approx 0.8% accurate with fully programmable accurate hysteresis implementing a new technique of a three resistor string on the input. the outputs are open drain capable of sinking up to 40ma. comparators and internal reference each of the comparators has one input available externally, the other comparator inputs are co nnected internally to the 400mv reference. the ADCMP341 has two noninverting comparators and the adcmp343 has two in verting comparators. there are two input pins avai lable to each comparator. however, these two input pins(inx_u, inx_u) connect to the same input leg of the comparator via a muxing system. this is to provide fully programmable rising and falling trip points. the output of the said comparator determines which pin is connected to the input of the same comparator. taking figure 30. as an example, when outa is high ina_u is connected to the comparator input. when the input voltage drops and passes below the 400mv reference the output goes low. this in turn disconnects ina_u from the comparator and connects ina_l. this leg of the string will be at a lower voltage and thus instantaneously the effect of hysteresis is applied. therefore, using a resistor string on the in put as shown in figure 30., the voltages for the rising and falling trip points can be programmed by selecting the approp riate resistors in the string. programming hysteresis the resistor values can be calculated as follows. the total resistance of the string is first determined based on the power budget available. using the maximum voltage expected on the pin and the maximum acceptable current available to flow through the string 1 , the total resistance of the string is calculated as follows: max inmax tot i v r = 1 assuming the leakage current into the comparator to be negligible now calculate the three resistor values as follows: falling falling tot v v r r ) 4 . 0 ( 1 ? = rising tot v r r 4 . 0 3 = ; 3 1 2 r r r r tot ? ? = ; where: r 1 , r 2 and r 3 are the three resistors as shown in figure 30. r tot is the sum of r 1 , r 2 and r 3 . v falling is the desired falling trip voltage and lower of the two. v rising is the desired rising trip voltage and higher of the two. v hyst is therefore = v rising -v falling v cc outa 400mv mux vina ina_u ina_l ADCMP341 r1 r2 r3 figure 30.
ADCMP341/adcmp343 preliminary technical data rev. prd | page 12 of 13 outline dimensions 13 5 6 2 8 4 7 2.90 bsc 1.60 bsc 1.95 bsc 0.65 bsc 0.38 0.22 0.15 max 1.30 1.15 0.90 seating plane 1.45 max 0.22 0.08 0.60 0.45 0.30 8 4 0 2.80 bsc pin 1 indicator compliant to jedec standards mo-178-ba figure 31. . 8-lead sot-23 package (rj-8)dimensions shown in millimeters ordering guide table 4. model temperature range package description branding package outline ADCMP341arj C40c to +125c sot-23, 8 lead rj-8 adcmp343arj C40c to +125c sot-23, 8 lead rj-8
preliminary technical data ADCMP341/adcmp343 rev. prd | page 13 of 13 notes ?2006 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners.

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