AZV3001 Datasheet, PDF (7/11 Pages) Diodes Incorporated – Single/Dual Channel Low Voltage Push-Pull Output Comparators

AZV3001, AZV3002
Application Information (continued)
External Hysteresis Application
The AZV3001 and AZV3002 have a hysteresis transfer curve that is a function of the following three components:
VTH: the actual set voltage or threshold trip voltage
VOS: the internal offset voltage between VIN+ and VIN-. This voltage is added to VTH to form the actual trip point at which the comparator
must respond in order to change output states.
VHYST: internal hysteresis (or trip window) that is designed to produce comparator sensitivity to noise.
VTH+VOS-VHYST
VTH+VOS+VHYST
VTH+VOS
Figure 15 AZV3001 Hysteresis Transfer Curve
V_IN-
-
VCC
R1
1MΩ
V_A
AZV3001
+
V_OUT
R2
1MΩ
R3 1MΩ
VCC
V_REF=2.5V
-
AZV3001
V_IN
R1 1MΩ _VA
+
V_OUT
Figure 16. Inverting Comparator With Hysteresis
R2 1MΩ
Figure 17. Non-Inverting Comparator With Hysteresis
No Phase Inversion
AZV3001 and AZV3002 are rail-to-rail input comparators, with the input common-mode voltage range reaching to the supply rails for both
positive and negative supplies. The AZV3001 and AZV3002 are designed to prevent phase inversion when the input pins exceed the supply
voltage. Figure 18 shows the AZV3001/2 response when input voltages exceed the supply, resulting in no phase inversion.
VCC=3.0V
VIN+
VIN-
VOUT
VIN-
VIN+
VOUT
Figure 18 Comparator Response to Input Voltage –No Phase Inversion
AZV3001/3002
Document number: DS37616 Rev. 3 - 2
7 of 11
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December 2015
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