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MCP6546

Open-Drain Output Sub-Microamp Comparators

Microchip Technology 

MCP6546/6R/6U/7/8/9

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).

¼ MCP6549

VDD

–

+

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.

VDD

VREF

MCP6041

VIN

R1

R2

VREF

VDD VPU

MCP6546

RPU

VOUT

FIGURE 4-9:

Comparator.

Precise Inverting

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).

VPU

1/2

VRT

MCP6547 RPU

VOUT

VIN

VRB

FIGURE 4-10:

1/2

MCP6547

Windowed Comparator.

DS21714E-page 16

© 2006 Microchip Technology Inc.

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