MCP6546-ISLASHMS datasheet(18/44 Pages) MICROCHIP

18 / 44 page

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

DS21714G-page 18

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

VOUT

VIN

VREF

VPU

RPU

MCP6546

MCP6041

VRT

1/2

VRB

VIN

VPU

RPU

VOUT

MCP6547

1/2

MCP6547

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