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| PIC16F648A-I Datasheet, PDF (18/34 Pages) Microchip Technology – Push-Pull Output Sub-Microamp Comparators | |||
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MCP6541/1R/1U/2/3/4
4.10 Typical Applications
4.10.1 PRECISE COMPARATOR
Some applications require higher DC precision. An
easy way to solve this problem is to use an amplifier
(such as the MCP6041) to gain-up the input signal
before it reaches the comparator. Figure 4-11 shows an
example of this approach.
VREF
VDD
MCP6041
VIN
R1
R2
VREF
VDD
MCP654X
VOUT
FIGURE 4-11:
Comparator.
Precise Inverting
4.10.2 WINDOWED COMPARATOR
Figure 4-12 shows one approach to designing a win-
dowed comparator. The AND gate produces a logic â1â
when the input voltage is between VRB and VRT (where
VRT > VRB).
VRT
1/2
MCP6542
VIN
VRB
FIGURE 4-12:
1/2
MCP6542
Windowed Comparator.
4.10.3 BISTABLE MULTI-VIBRATOR
A simple bistable multi-vibrator design is shown in
Figure 4-13. VREF needs to be between the power
supplies (VSS = GND and VDD) to achieve oscillation.
The output duty cycle changes with VREF.
R1
VREF
R2
VDD
MCP6541
VOUT
C1
R3
FIGURE 4-13:
Bistable Multi-vibrator.
DS21696E-page 18
© 2006 Microchip Technology Inc.
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