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| Preliminary Technical Data FEATURES 2.25V to 5.5V Operating Voltage Range Low Power Consumption (2A) Output Stages ADCMP370: Open-Drain with High Voltage (22V) Tolerance ADCMP371: Push-Pull 10nA Input Bias Current 5nA Input Offset Current 6mV Input Offset Voltage 0V to VCC Common Mode Input Range Specified Over -40C to +125C Temperature Range 5-Lead SC70 Package General Purpose Comparators ADCMP370/ADCMP371 FUNCTIONAL BLOCK DIAGRAMS VCC ADCMP370 ADM331 IN+ IN- OUT GND VCC APPLICATIONS Voltage Detectors Battery Management Systems A/D Converters Low Voltage Applications Battery Powered Electronics Portable Equipment ADM332 ADCMP371 IN+ VCC OUT IN- GENERAL DESCRIPTION The ADCMP370/ADCMP371 are general purpose comparators with input offset voltages of 6mV (max). High performance over the -40C to +125C temperature range make them suitable for use in automotive and other thermally harsh applications, while low power consumption and space efficient SC70 packaging make them ideal for battery powered portable equipment. The ADCMP371 has a push-pull output stage, while the ADCMP370 has an open-drain output, which can be pulled as high as 22V through an external resistor. GND Rev.PrB 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 companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. www.analog.com Tel: 781.329.4700 Fax: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved. ADCMP370/ADCMP371 SPECIFICATIONS (VCC=Full Operating Range, TA=-40C to +125C, unless otherwise noted.) Parameter SUPPLY VCC Operating Voltage Range Supply Current COMMON MODE INPUT RANGE INPUT OFFSET VOLTAGE INPUT BIAS CURRENT INPUT OFFSET CURRENT OUT VOLTAGE LOW OUT VOLTAGE HIGH (ADCMP371) OUT LEAKAGE CURRENT (ADCMP370) TIMING Propagation Delay Min 2.25 2 0 10 5 0.8VCC 1 5 1 10 2 Typ Max 5.5 5 VCC 6 150 0.3 Preliminary Technical Data Units V A V mV nA nA V V A s s Test Conditions/Comments VCC = 3.3V IN+ < IN-, ISINK=1.2mA IN+ > IN-, ISOURCE=500A IN+ > IN-, OUT=22V Input Overdrive=10mV Input Overdrive=100mV ABSOLUTE MAXIMUM RATINGS Table 3. TA = 25C unless otherwise noted. Parameter VCC IN+, INOUT (ADCMP370) OUT (ADCMP371) Operating Temperature Range Storage Temperature Range JA Thermal Impedance, SC70 Lead Temperature Soldering (10 sec) Vapour Phase (60 sec) Infrared (15 sec) Rating -0.3V to +6V -0.3V to +6V -0.3V to +25V -0.3V to +VCC+0.3V -40C to +125C -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. Rev. PrB | Page 2 of 8 Preliminary Technical Data PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS IN+ GND IN1 2 3 ADCMP370/ ADM331/ ADCMP370/ADCMP371 5 ADM332 ADCMP371 VCC 4 OUT Table 4. Pin Functional Descriptions Pin No. 1 2 3 4 5 Name IN+ GND INOUT VCC Description Non-Inverting Input Ground Inverting Input Comparator Output. Open-Drain for ADCMP370. Push-Pull for ADCMP371. Power Supply 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. PrB | Page 3 of 8 ADCMP370/ADCMP371 TYPICAL PERFORMANCE CHARACTERISTICS Preliminary Technical Data Figure 1. Supply Current vs. Supply Voltage Output High Figure 4. Output Voltage vs. Output Current at 2.7V Supply Figure 2. Supply Current vs. Supply Voltage Output Low Figure 5. Input Bias Current vs. Supply Voltage Figure 3. Output Voltage vs. Output Current at 5V Supply Figure 6. Response Time vs. Input Overdrives Negative Transition (5V) Rev. PrB | Page 4 of 8 Preliminary Technical Data ADCMP370/ADCMP371 Figure 7. Response Time vs. Input Overdrives Positive Transition (5V) Figure 10. Output Saturation Voltage vs. Output Sink Current Figure 8. Response Time vs. Input Overdrives Negative Transition(2.7V) Figure 11. 10kHz Response Figure 9. Response Time vs. Input Overdrives Positive Transition(2.7V) Rev. PrB | Page 5 of 8 ADCMP370/ADCMP371 APPLICATIONS INFORMATION BASIC COMPARATOR In it's 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 22V. 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 1k and 10k. 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+ Preliminary Technical Data the threshold is above VREF and when it's decreasing, the threshold is below VREF. The upper input threshold level is given by: VIN_HI = VREF (R1 + R 2) - VCC R1 R2 VREF (R1 + R 2) R2 VCC R1 R2 The lower input threshold level is given by: VIN_LO = The hysteresis is the difference between these voltage levels: VIN = In the example in figure 13, resistors R1 and R2 are chosen to give 1V hysteresis about the reference of 2.5V, with VCC=5V. It's important that RPULL-UP< OUT VIN VREF VREF=2.5V VIN VCC=5V ADM331 ADCMP370 ININ+ R1=200k RPULL-UP=5k OUT RLOAD V+ VOUT R2=1M VREF 0V VOUT t VIN Figure 12. Basic Comparator and Input and Output Signals VIN_LO =2V VIN_HI =3V VIN 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 non-inverting configuration, shown in figure 13, 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, Rev. PrB | Page 6 of 8 Figure 13. Non-Inverting Comparator Configuration with Hysteresis Preliminary Technical Data With the inverting configuration, the upper and lower switching thresholds are as follows: ADCMP370/ADCMP371 VIN_HI = VIN_LO = VCC R 2 (R1 || R3) + R 2 VCC (R 2 || R3) R1 + (R 2 || R3) VCC=5V R1=1M ADM332 ADCMP371 IN+ VCC VIN IN- OUT RLOAD R3=1M R2=1M VOUT High: VCC VOUT Low: VCC R1 R3 R1 VIN_HI R2 VIN_LO R2 R3 VOUT VIN_LO =1.67V VIN_HI =3.33V VIN Figure 14. Non-Inverting Comparator Configuration with Hysteresis Rev. PrB | Page 7 of 8 ADCMP370/ADCMP371 OUTLINE DIMENSIONS 0.087 (2.20) 0.071 (1.80) Preliminary Technical Data 0.053 (1.35) 0.045 (1.15) 5 4 0.094 (2.40) 0.071 (1.80) 1 2 3 PIN 1 0.026 (0.65) BSC 0.051 (1.30) BSC 0.039 (1.00) 0.031 (0.80) 0.012 (0.30) 0.006 (0.15) 0.043 (1.10) 0.031 (0.80) 8o 0o 0.004 (0.10) 0.000 (0.00) SEATING PLANE 0.007 (0.18) 0.004 (0.10) 0.012 (0.30) 0.004 (0.10) Figure 1. 5-Lead Plastic Surface Mount Package [SC70] (KS-5) Dimensions shown in millimeters ORDERING GUIDE Model ADCMP370AKS-R7 ADCMP370AKS-RL ADCMP371AKS-R7 ADCMP371AKS-RL Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C Quantity 3k 10k 3k 10k Package Type SC70-5 SC70-5 SC70-5 SC70-5 Branding M1F M1F M1G M1G (c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. Printed in the U.S.A. PR04745-0-4/04(PrB) Rev. PrB | Page 8 of 8 |
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