MCP6541/1R/1U/2/3/4
4.10
4.10.1
Typical Applications
PRECISE COMPARATOR
4.10.3
BISTABLE MULTI-VIBRATOR
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.
V
DD
V
REF
MCP6041
V
DD
V
IN
R
1
R
2
V
REF
MCP654X
V
OUT
A simple bistable multi-vibrator design is shown in
Figure 4-13.
V
REF
needs to be between the power
supplies (V
SS
= GND and V
DD
) to achieve oscillation.
The output duty cycle changes with V
REF
.
R
1
V
REF
V
DD
MCP6541
V
OUT
R
2
C
1
R
3
FIGURE 4-13:
Bistable Multi-vibrator.
FIGURE 4-11:
Comparator.
4.10.2
Precise Inverting
WINDOWED COMPARATOR
Figure 4-12
shows one approach to designing a win-
dowed comparator. The AND gate produces a logic 鈥?鈥?/div>
when the input voltage is between V
RB
and V
RT
(where
V
RT
> V
RB
).
V
RT
1/2
MCP6542
V
IN
V
RB
1/2
MCP6542
FIGURE 4-12:
Windowed Comparator.
DS21696E-page 18
漏
2006 Microchip Technology Inc.
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