ADCMP350YKSZ-REEL7(2018) Просмотр технического описания (PDF) - Analog Devices

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ADCMP350YKSZ-REEL7
(Rev.:2018)

Comparators and Reference Circuits

Analog Devices 

Data Sheet

APPLICATIONS INFORMATION

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 20, 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 is decreasing, the threshold is below VREF.

The upper input threshold level is given by

VIN_HI

=

VREF (R1 +

R2

R2)

where VREF = 0.6 V, assuming RLOAD >> R2, RPULLUP

The lower input threshold level is given by

( ) VIN_LO = VREF

R1 + R2 + RPULLUP

R2 + RPULLUP

− VCCR1

The hysteresis is the difference between these voltage levels and

is given by

( ) ( ) = VHYS

VREF R1

R2

− R1 VREF + VCC

R2 + RPULLUP

VCC = 5V

VIN

R1

ADCMP354

VREF = 0.6V

RPULLUP

OUT

RLOAD

ADCMP350/ADCMP354/ADCMP356

VOLTAGE DETECTOR

The ADCMP350/ADCMP354/ADCMP356 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 21 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

R2

ADCMP354

VREF = 0.6V

RPULLUP

OUT

Figure 21. Voltage Detector Application

R2

Figure 20. Noninverting Comparator Configuration with Added Hysteresis

Rev. E | Page 9 of 10

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