MCP6L71 datasheet(5/40 Pages) MICROCHIP

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DS20002145B-page 5

MCP6L71/1R/2/4

1.3

Test Circuits

The circuit used for most DC and AC tests is shown in

Figure 1-1. This circuit can independently set VCM and

VOUT; see Equation 1-1. Note that VCM is not the

circuit’s Common-mode voltage ((VP + VM)/2), and that

VOST includes VOS plus the effects (on the input offset

error, VOST) of temperature, CMRR, PSRR and AOL.

EQUATION 1-1:

FIGURE 1-1:

AC and DC Test Circuit for

Most Specifications.

GDM

RF RG



VCM

VP VDD 2



 2



VOUT

VDD 2





VP VM

–

 V

OST 1

GDM



Where:

GDM = Differential-mode Gain

(V/V)

VCM = Op Amp’s Common-mode

Input Voltage

(V)

VOST = Op Amp’s Total Input Offset

Voltage

(mV)

VOST

VIN– VIN+

–

VDD

MCP6L7X

VOUT

CB2

CB1

100 k



100 k



VDD/2

100 k



100 k



60 pF

10 k



1µF

100 nF

VIN-

VIN+

6.8 pF

–

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