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MCP6547T-I/SL Datasheet(PDF) 16 Page - Microchip Technology

Part # MCP6547T-I/SL
Description  Open-Drain Output Sub-Microamp Comparators
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP6547T-I/SL Datasheet(HTML) 16 Page - Microchip Technology

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MCP6546/6R/6U/7/8/9
DS21714E-page 16
© 2006 Microchip Technology Inc.
4.9
Unused Comparators
An unused amplifier in a quad package (MCP6549)
should be configured as shown in Figure 4-8. This
circuit prevents the output from toggling and causing
crosstalk. It uses the minimum number of components
and draws minimal current (see Figure 2-15 and
Figure 2-18).
FIGURE 4-8:
Unused Comparators.
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 4-9 shows an
example of this approach.
FIGURE 4-9:
Precise Inverting
Comparator.
4.10.2
WINDOWED COMPARATOR
Figure 4-10 shows one approach to designing a
windowed comparator. The wired-OR connection
produces a high output (logic 1) when the input voltage
is between VRB and VRT (where VRT > VRB).
FIGURE 4-10:
Windowed Comparator.
¼ MCP6549
VDD
+
VREF
VDD
VDD
R1
R2
VOUT
VIN
VREF
VPU
RPU
MCP6546
MCP6041
VRT
1/2
VRB
VIN
VPU
RPU
VOUT
MCP6547
1/2
MCP6547


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