MCP6C26 datasheet(21/37 Pages) MICROCHIP

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DS20006928A-page 23

MCP6C26

4.0

DEVICE OPERATION

This chapter includes additional information on basic

operations and major functions.

4.1

Basic Performance

4.1.1

IDEAL PERFORMANCE

Figure 4-1 shows the basic circuit; inputs, supplies and

output. When the inputs (VIP, VIM, VDD, VSS and VREF)

and output (VOUT) are in their specified ranges, and the

part is nearly ideal, the output voltage is:

EQUATION 4-1:

FIGURE 4-1:

Basic Circuit.

For normal operation, keep:

•VCM between VCML and VCMH

•VDM between VDML and VDMH

•VREF between VRL and VRH

•VOUT between 0.1V to VDD – 0.1V, usually VOL

and VOH are hard limits

4.1.2

ANALOG ARCHITECTURE

Figure 4-2 shows the block diagram for these current

sense amplifiers.

FIGURE 4-2:

MCP6C26 Block Diagram.

4.1.3

DC PERFORMANCE

4.1.3.1

DC Voltage Errors

Section 1.5, Explanation of DC Error Specifications

covers some DC specifications. The input offset error

(with temperature coefficients), gain error and

nonlinearities are discussed in detail.

VOUT VREF GDMVDM



Where:

GDM = Differential-Mode Gain

VREF = Output Reference Voltage

VDM = Differential-Mode Input (VIP –VIM)

–

VSS VREF

VDD

VIP

VOUT

VIM

VOUT

–

VSS

VREF

VDD

VIM

VIP

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