Datasheet

 2009-2013 Microchip Technology Inc. DS22143D-page 21
MCP6566/6R/6U/7/9
4.9 Typical Applications
4.9.1 PRECISE COMPARATOR
Some applications require higher DC precision. An
easy way to solve this problem is to use an amplifier
(such as the MCP6291) to gain-up the input signal
before it reaches the comparator. Figure 4-12 shows
an example of this approach.
FIGURE 4-12: Precise Inverting
Comparator.
4.9.2 WINDOWED COMPARATOR
Figure 4-13 shows one approach to designing a
windowed comparator. The AND gate produces a logic
‘1’ when the input voltage is between V
RB
and V
RT
(where V
RT
> V
RB
).
FIGURE 4-13: Windowed Comparator.
4.9.3 BISTABLE MULTIVIBRATOR
A simple bistable multivibrator design is shown in
Figure 4-14. 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
.
FIGURE 4-14: Bistable Multivibrator.
V
REF
V
DD
V
DD
R
1
R
2
V
OUT
V
IN
V
REF
MCP6291
V
PU
R
PU
MCP656X
V
RT
V
RB
V
IN
V
PU
R
PU
V
OUT
1/2
MCP6567
1/2
MCP6567
V
DD
R
1
R
2
R
3
V
REF
C
1
V
OUT
V
PU
R
PU
MCP656X