MCP6566_13 Datasheet, PDF (21/48 Pages) Microchip Technology – 1.8V Low-Power Open-Drain Output Comparator

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.
V_REF
V_DD
MCP6291
V_IN
R₁
R₂
V_REF
V_PU
V_DD
R_PU
MCP656X
V_OUT
FIGURE 4-12:
Comparator.
Precise Inverting
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).
1/2
V_PU
V_RT
MCP6567
R_PU
V_OUT
V_IN
V_RB
FIGURE 4-13:
1/2
MCP6567
Windowed Comparator.
MCP6566/6R/6U/7/9
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.
R₁
V_REF
R₂
V_DD
V_PU
R_PU
MCP656X
V_OUT
C₁
R₃
FIGURE 4-14:
Bistable Multivibrator.
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DS22143D-page 21