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ADCMP356YKS-REEL7 bảng dữ liệu(PDF) 9 Page - Analog Devices

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ADCMP356YKS-REEL7 bảng dữ liệu(HTML) 9 Page - Analog Devices

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ADCMP350/ADCMP354/ADCMP356
Rev. B | Page 9 of 12
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
(
)
PULLUP
CC
PULLUP
R
R2
R1
V
R
R2
R1
+
+
+
= REF
IN_HI
V
V
where VREF = 0.6 V, assuming RLOAD >> R2, RPULLUP
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
PULLUP
R
R2
R1
+
=
CC
IN
V
V
ADCMP354
OUT
VCC = 5V
RPULLUP
RLOAD
R2
R1
VIN
VREF = 0.6V
Figure 20. Noninverting Comparator Configuration with Added Hysteresis
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.
ADCMP354
OUT
VCC = 5V
RPULLUP
R1
R2
VIN
VREF = 0.6V
Figure 21. Voltage Detector Application


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