ADCMP350(2004) 查看數據表（PDF） - Analog Devices

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ADCMP350
(Rev.:2004)

Comparators and Reference Circuits

Analog Devices 

ADCMP350/ADCMP352/ADCMP354/ADCMP356

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

VIN_HI

=

VREF (R1+ R2) −VCC R1

R2

where VREF = 0.6 V.

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

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.

VCC = 5V

VIN

R1

AADDMC3M31P354

VREF = 0.6V

VIN

R1

OUT

RPULLUP

Figure 20. Voltage Detector Application

VCC = 5V

AADDMC3M31P354

VREF = 0.6V

VIN

VIN

R1

OUT

RPULLUP

RLOAD

R2

Figure 19. Noninverting Comparator Configuration with Hysteresis

Rev. 0 | Page 9 of 12

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