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| General-Purpose Comparators ADCMP370/ADCMP371 FEATURES 2.25 V to 5.5 V operating voltage range Low power consumption (4 A) 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 -40C to +85C temperature range 5-lead SC70 package FUNCTIONAL BLOCK DIAGRAMS VCC ADCMP370 IN+ IN- 04745-0-001 OUT GND Figure 1. VCC APPLICATIONS Voltage detectors Battery management systems A/D converters Low voltage applications Battery-powered electronics Portable equipment ADCMP371 IN+ VCC OUT IN- 04745-0-002 GENERAL DESCRIPTION The ADCMP370/ADCMP371 are general-purpose comparators with input offset voltages of 9 mV (max) 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. They are available in space-efficient 5-lead SC70 packaging. GND Figure 2. Rev. 0 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: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved. ADCMP370/ADCMP371 TABLE OF CONTENTS 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 10/04--Revision 0: Initial Version Rev. 0 | Page 2 of 12 ADCMP370/ADCMP371 SPECIFICATIONS VCC = Full Operating Range, TA = -40C to +85C, unless otherwise noted. Table 1. Parameter SUPPLY VCC Operating Voltage Range Supply Current COMMON-MODE INPUT RANGE INPUT OFFSET VOLTAGE INPUT OFFSET VOLTAGE AVERAGE DRIFT INPUT BIAS CURRENT INPUT OFFSET CURRENT OUT VOLTAGE LOW OUT VOLTAGE HIGH (ADCMP371) OUT LEAKAGE CURRENT (ADCMP370) Output Rise Time Output Fall Time TIMING Propagation Delay Min 2.25 4 0 5 50 150 0.4 0.8 VCC 1 30 45 5 2 Typ Max 5.5 7 VCC 9 Unit V A V mV V/C nA nA V V A ns ns s s Test Conditions/Comments VIN = VCC/2 VCM = 0 V VIN = VCC/2 VIN = VCC/2 IN+ < IN-, ISINK = 1.2 mA IN+ > IN-, ISOURCE = 500 A IN+ > IN-, OUT = 22 V COUT = 15 pF COUT = 15 pF Input overdrive = 10 mV Input overdrive = 100 mV Rev. 0 | Page 3 of 12 ADCMP370/ADCMP371 ABSOLUTE MAXIMUM RATINGS TA = 25C, unless otherwise noted. Table 2. Parameter VCC IN+, IN- OUT (ADCMP370) OUT (ADCMP371) Operating Temperature Range Storage Temperature Range JA Thermal Impedance, SC70 Lead Temperature Soldering (10 sec) Vapor Phase (60 sec) Infrared (15 sec) Rating -0.3 V to +6 V -0.3 V to +25 V -0.3 V to +25 V -0.3 V to +VCC + 0.3 V -40C to +85C -65C to +150C 146C/W 300C 215C 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. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without 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. Rev. 0 | Page 4 of 12 ADCMP370/ADCMP371 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS IN+ 1 2 3 5 VCC GND IN- 4 OUT Figure 3. Pin Configuration Table 3. Pin Function Descriptions Pin No. 1 2 3 4 5 Mnemonic IN+ GND IN- OUT VCC Description Noninverting Input. Ground. Inverting Input. Comparator Output. Open-drain for ADCMP370. Push-pull for ADCMP371. Power Supply. Rev. 0 | Page 5 of 12 04745-0-003 ADCMP370/ ADCMP371 ADCMP370/ADCMP371 TYPICAL PERFORMANCE CHARACTERISTICS 30 25 20 3.0 2.5 PROPAGATION DELAY (s) tPHL 2.0 OFFSET (mV) 15 10 5 0 -5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 CM I/P (V) 1.5 tPLH 1.0 0.5 04745-0-006 0 -40 25 85 TEMPERATURE (C) 125 Figure 4. Input Offset vs. Common-Mode Input Voltage Figure 7. Propagation Delay vs. Temperature 4.5 4.0 4.0 3.5 tPLH -40C PROPAGATION DELAY (s) 3.5 SUPPLY CURRENT (A) 3.0 -40C 2.5 2.0 1.5 1.0 0.5 +25C 3.0 2.5 2.0 1.5 1.0 0.5 0 10 20 30 40 50 60 70 80 90 100 110 120 130 INPUT OVERDRIVE (mV) 04745-0-007 tPLH +125C tPLH +25C +125C 0 1 2 3 4 SUPPLY VOLTAGE (V) 5 6 Figure 5. Propagation Delay vs. Input Overdrive (Low to High) 6 Figure 8. Supply Current vs. Supply Voltage (Output Low) 4.0 3.5 5 PROPAGATION DELAY (s) SUPPLY CURRENT (A) 3.0 -40C 2.5 2.0 1.5 1.0 0.5 +25C +125C 4 tPHL +125C 3 tPHL +25C tPHL -40C 2 1 04745-0-008 0 10 0 1 2 3 4 SUPPLY VOLTAGE (V) 5 6 20 30 40 50 60 70 80 90 100 110 120 130 INPUT OVERDRIVE (mV) Figure 6. Propagation Delay vs. Input Overdrive (High to Low) Figure 9. Supply Current vs. Supply Voltage (Output High) Rev. 0 | Page 6 of 12 04745-0-015 04745-0-021 04745-0-013 ADCMP370/ADCMP371 1000 900 900 OUTPUT LOW VOLTAGE (mV) 800 700 600 500 400 VCC = 3.3V 300 VCC = 5V 200 100 04745-0-016 700 VCC = 2.25V I BIAS (nA) 500 300 VCC = 5.5V 100 0 0 1 2 3 4 5 SINK CURRENT (mA) -100 5.1 5.2 5.3 VIN (V) 5.4 5.5 Figure 10. Output Low Voltage vs. Sink Current -1.0 -1.2 -1.4 1.10 1.20 1.15 Figure 13. Input Bias Current vs. Input Voltage HYSTERESIS (mV) -1.6 OFFSET (mV) -1.8 -2.0 -2.2 -2.4 -2.6 -2.8 04745-0-020 1.05 1.00 0.95 0.90 0.85 0.80 2.25 04745-0-027 04745-0-028 VCC = 2.25V VCC = 5V VCC = 3.3V -3.0 -40 25 85 TEMPERATURE (C) 125 2.75 3.25 3.75 4.25 VCC (V) 4.75 5.25 5.50 Figure 11. Input Offset vs. Temperature 300 IOUT = 2mA 250 2.5 3.0 Figure 14. Hysteresis vs. Supply Voltage OUTPUT LOW VOLTAGE (mV) 150 IOUT = 1mA 100 HYSTERESIS (mV) 200 2.0 1.5 1.0 VCC = 5V 50 04745-0-022 0.5 0 -50 0 50 TEMPERATURE (C) 100 150 0 -50 0 50 TEMPERATURE (C) 100 150 Figure 12. Output Low Voltage vs. Temperature Figure 15. Hysteresis vs. Temperature Rev. 0 | Page 7 of 12 04745-0-023 ADCMP370/ADCMP371 1 CH1 = (IN-) - IN+ 1 CH1 = (IN-) - IN+ CH2 = OUT CH2 = OUT 2 04745-0-029 2 04745-0-030 CH1 10mV/DIV CH2 2.00V/DIV TIMEBASE: 3.00s/DIV CH1 100mV/DIV CH2 2.00V/DIV TIMEBASE: 1.00s/DIV Figure 16. Propagation Delay Timing 10 mV Overdrive Figure 17. Propagation Delay Timing 100 mV Overdrive Rev. 0 | Page 8 of 12 ADCMP370/ADCMP371 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 which 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 applies also 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 would be between 1 k and 10 k. The ADCMP371 has a push-pull output stage, which has an internal PMOS pull-up and therefore doesn't require an external resistor. Faster switching speeds between low and high rails are possible, but the logic high level is limited to VCC. VCC V+ The upper input threshold level is given by VIN_HI = VREF (R1 + R2 ) - VCC R1 R2 The lower input threshold level is given by VIN_LO = VREF (R1 + R2 ) R2 The hysteresis is the difference between these voltage levels and is given by VIN = VCC R1 R2 In the example in Figure 19, resistors R1 and R2 are chosen to give 1 V hysteresis about the reference of 2.5 V, with VCC = 5 V. It's important that RPULL-UP << RLOAD so that the output high voltage isn't pulled below VCC. VCC = 5V ADM331 ADCMP370 VREF = 2.5V IN- IN+ R1 = 200k OUT RPULLUP = 5k ADM331 ADCMP370 OUT VIN VREF VIN RLOAD R2 = 1M VOUT V+ VOUT VREF 0V t VIN 04745-0-017 VIN_LO VIN_HI = 2V = 3V VIN Figure 19. Noninverting Comparator Configuration with Hysteresis 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 VREF; and when it's decreasing, the threshold is below VREF. With the inverting configuration, the upper and lower switching thresholds are VIN_HI = VIN_LO = VCC R2 (R1 || R3) + R2 VCC (R2 || R3 ) R1 + (R2 || R3 ) Rev. 0 | Page 9 of 12 04745-0-018 ADCMP370/ADCMP371 VCC = 5V R1 = 1M IN+ ADCMP371 VCC OUT VIN IN- RLOAD R2 = 1M R3 = 1M VOUT HIGH: VOUT LOW: VCC VCC R1 VIN_HI R3 VIN_LO R1 R2 R2 R3 VOUT VIN_LO VIN_HI = 1.67V = 3.33V VIN Figure 20. Noninverting Comparator Configuration with Hysteresis Rev. 0 | Page 10 of 12 04745-0-019 ADCMP370/ADCMP371 OUTLINE DIMENSIONS 2.00 BSC 5 4 1.25 BSC 1 2 3 2.10 BSC PIN 1 1.00 0.90 0.70 0.65 BSC 1.10 MAX 0.22 0.08 0.30 0.15 0.10 COPLANARITY COMPLIANT TO JEDEC STANDARDS MO-203AA SEATING PLANE 0.10 MAX 0.46 0.36 0.26 Figure 21. 5-Lead Thin Shrink Small Outline Transistor Package [SC70] (KS-5) Dimensions shown in millimeters ORDERING GUIDE Model ADCMP370AKS-REEL ADCMP370AKS-REEL7 ADCMP371AKS-REEL ADCMP371AKS-REEL7 Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description 5-Lead SC70 5-Lead SC70 5-Lead SC70 5-Lead SC70 Package Option KS-5 KS-5 KS-5 KS-5 Branding M1F M1F M1G M1G Rev. 0 | Page 11 of 12 ADCMP370/ADCMP371 NOTES (c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04745-0-10/04(0) Rev. 0 | Page 12 of 12 This datasheet has been download from: www..com Datasheets for electronics components. |
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