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ADCMP350 bảng dữ liệu(PDF) 9 Page - Analog Devices |
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ADCMP350 bảng dữ liệu(HTML) 9 Page - Analog Devices |
9 / 12 page ADCMP350/ADCMP352/ADCMP354/ADCMP356 Rev. 0 | Page 9 of 12 APPLICATIONS 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 noninverting parts (ADCMP354 and ADCMP356). 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. The upper input threshold level is given by () R2 R1 V R2 R1 V V CC REF IN_HI − + = where VREF = 0.6 V. The lower input threshold level is given by ( ) R2 R2 R1 V V REF IN_LO + = The hysteresis is the difference between these voltage levels and is given by R2 R1 V V CC IN = ∆ ADM331 OUT ADCMP354 VCC = 5V RPULLUP RLOAD R2 R1 VIN VIN VREF = 0.6V Figure 19. Noninverting Comparator Configuration with Hysteresis VOLTAGE DETECTOR The ADCMP35x parts can be used to monitor voltages, such as battery monitoring or threshold detectors. Using a resistor divider at the input to select the appropriate trip voltage, the comparator can be configured to give a logic output when the input passes that threshold. Figure 20 shows the typical configuration of the ADCMP354 for monitoring a supply to indicate that the voltage is above a certain level. ADM331 OUT ADCMP354 VCC = 5V RPULLUP R1 VIN VIN VREF = 0.6V R1 Figure 20. Voltage Detector Application |
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