MCP6051-ESLASHST datasheet(18/34 Pages) MICROCHIP

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MCP6051/2/4

DS22182A-page 18

4.7.2

INSTRUMENTATION AMPLIFIER

The MCP6051/2/4 op amps are well suited for condi-

tioning sensor signals in battery-powered applications.

Figure 4-8 shows a two op amp instrumentation

amplifier, using the MCP6052, that works well for

applications requiring rejection of common mode noise

at higher gains. The reference voltage (VREF) is

supplied by a low impedance source. In single supply

applications, VREF is typically VDD/2.

FIGURE 4-8:

Two Op Amp

Instrumentation Amplifier.

To obtain the best CMRR possible, and not limit the

performance by the resistor tolerances, set a high gain

with the RG resistor.

4.7.3

PRECISION COMPARATOR

Use high gain before a comparator to improve the

latter’s input offset performance. Figure 4-9 shows a

gain of 11 V/V placed before a comparator. The

reference voltage VREF can be any value between the

supply rails.

FIGURE 4-9:

Precision, Non-inverting

Comparator.

OUT

–

() 1

------

---------

⎝⎠

⎛⎞

REF

VREF R1

VOUT

MCP6052

VIN

VOUT

100 k

MCP6541

VREF

MCP6051

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