MCP6541/1R/1U/2/3/4
4.10.3
BISTABLE MULTI-VIBRATOR
4.10 Typical Applications
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.
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.
The output duty cycle changes with VREF
.
R1
R2
VREF
VDD
VDD
VREF
VOUT
MCP6541
MCP6041
VDD
MCP654X
VIN
C1
R3
R1
R2
VREF
VOUT
FIGURE 4-13:
Bistable Multi-vibrator.
FIGURE 4-11:
Precise Inverting
Comparator.
4.10.2
WINDOWED COMPARATOR
Figure 4-12 shows one approach to designing a win-
dowed comparator. The AND gate produces a logic ‘1’
when the input voltage is between VRB and VRT (where
VRT > VRB).
VRT
1/2
MCP6542
VIN
1/2
MCP6542
VRB
FIGURE 4-12:
Windowed Comparator.
DS21696E-page 18
© 2006 Microchip Technology Inc.
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