ADCMP370 Просмотр технического описания (PDF) - Analog Devices
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ADCMP370 Datasheet PDF : 12 Pages
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ADCMP370/ADCMP371
The hysteresis is the difference between these voltage levels and
is given by
∆VIN
=
(R1 ×
VCC × R1 × R2
R3) + (R2 × R1) + (R2 ×
R3)
VCC = 5V
R1 = 1MΩ
VIN
ADCMP371
IN+
IN–
OUT
RLOAD
R2 = 1MΩ
R3 = 1MΩ
VOUT HIGH:
VCC
VOUT LOW:
VCC
R1 R3
R1
VIN_HI
VIN_LO
R2
R2 R3
VOUT
VIN_LO VIN_HI
VIN
= 1.67V = 3.33V
Figure 20. Inverting ADCMP371 Comparator Configuration with Hysteresis
For the ADCMP370 configuration, a pull-up resistor is required
for the open-drain output, which affects the hysteresis calcula-
tion. The noninverting ADCMP370 configuration is shown in
Figure 21. The upper switching threshold is
VIN_HI
=
VREF (R1 +
R2
R2)
The lower input threshold level is given by
( ) VIN_LO = VREF
R1 + R2 + RPULLUP
R2 + RPULLUP
− VCC R1
The hysteresis is the difference between these voltage levels
∆VIN
=
VCC R1
R2 + RPULLUP
VCC = 5V
ADCMP370
VREF = 2.5V
IN–
IN+
VIN
R1
Data Sheet
OUT
RPULLUP
RLOAD
R2
Figure 21. Noninverting ADCMP370 Comparator Configuration with
Hysteresis
The inverting ADCMP370 configuration is shown in Figure 22.
The upper and lower switching thresholds are
( ) VIN_HI =
VCC R2
R1 || (R3 + RPULLUP ) + R2
( ) VIN_HI
=
VCC × R2 R1 + (R3 + RPULLUP )
(R1× (R3 + RPULLUP )) + (R2 × R1) + (R2 × (R3 + RPULLUP ))
(( )) VIN_LO
=
VCC
R1 +
R2 || (R3 + RPULLUP )
R2 || (R3 + RPULLUP )
VIN_LO
=
(R1× (R3
+
VCC × R2 × (R3 + RPULLUP )
RPULLUP )) + (R2 × R1) + (R2 × (R3
+
RPULLUP ))
assuming RLOAD >> R1, R2, R3, RPULLUP.
The hysteresis is the difference between these voltage levels and
is given by
∆VIN
=
(R1× (R3 +
VCC × R1× R2
RPULLUP )) + (R2 × R1) + (R2 × (R3 +
RPULLUP ))
VCC = 5V
R1
ADCMP370
IN+
VIN
IN–
OUT
RPULLUP
RLOAD
R2
R3
Figure 22. Inverting ADCMP370 Comparator Configuration with Hysteresis
Rev. D | Page 10 of 12
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