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MCP6XXX Amplifier Evaluation Board 1 User’s Guide
2.3.1.7
INVERTING COMPARATOR
? Compares the input voltage to another (reference) voltage and forces the output
to one of two digital states. Input signal is applied to the inverting input. The
comparison includes a user selected amount of hysteresis. Input and output
voltages are shifted by a reference for single supply
? The Mindi? Amplifier Designer gives design recommendations for the inverting
comparator circuit; see the circuit diagram shown in Figure 2-12
- Fill the sockets with the recommended resistors and capacitors
- Set JP1 and JP2 in the correct positions
(for the given example, JP1: Position B, JP2: Position C)
Note: The MCP6XXX Amplifier Evaluation Board 1 currently only supports the inverting
comparator with center trip point = 2.5V.
V S
V DD
Power
Mid-supply
V R R 5
R 6
Supply
Reference
C U1
V IN
R 1
U 1 V OUT
Output
Load
V L
C 5
FIGURE 2-12:
Inverting Comparator Circuit Diagram.
Figure 2-13 shows an example of the inverting comparator circuit diagram supported
by MCP6XXX Amplifier Evaluation Board 1.
* Test Points
VDD
CR2
0.1 μF
RR1
20 k Ω
RR2
20 k Ω
0.1 μF
CR1
UR1
JP2
C
D
R5
C4
R6
VDD
0.1 μF
Power Supply
VDD
VREF
C2
R4
CU1
U1
DP1
CP1
R1
R2
R3
1.0 μF
GND
C1
C3
RISO
V IN
JP1
A
C5
R7
CL
RL
VL
GND
B
FIGURE 2-13:
Inverting Comparator Example Supported by the MCP6XXX
Amplifier Evaluation Board 1.
DS51667A-page 14
? 2007 Microchip Technology Inc.
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