MCP6S28 datasheet(7/42 Pages) MICROCHIP

7 / 42 page

 2003-2012 Microchip Technology Inc.

DS21117B-page 7

MCP6S21/2/6/8

1.1

DC Output Voltage Specs / Model

1.1.1

IDEAL MODEL

The ideal PGA output voltage (VOUT) is:

EQUATION

(see Figure 1-7). This equation holds when there are

no gain or offset errors and when the VREF pin is tied to

a low impedance source (<< 0.1

) at ground potential

(VSS = 0V).

1.1.2

LINEAR MODEL

The PGA’s linear region of operation, including offset

and gain errors, is modeled by the line VO_linear, shown

in Figure 1-7.

EQUATION

The endpoints of this line are at VO_ideal =0.3V and

VDD-0.3V. The gain and offset specifications referred to

in the electrical specifications are related to Figure 1-7,

as follows:

EQUATION

FIGURE 1-7:

Output Voltage Model with

the standard condition VREF = VSS = 0V.

1.1.3

OUTPUT NON-LINEARITY

Figure 1-8 shows the Integral Non-Linearity (INL) of the

output voltage.

EQUATION

The output non-linearity specification in the electrical

specifications is related to Figure 1-8 by:

EQUATION

FIGURE 1-8:

Output Voltage INL with the

standard condition VREF = VSS = 0V.

O_ideal

REF

where: G is the nominal gain

O_linear

 V

0.3V

–

 0.3V

REF

100%

–

0.6V

–



--------------------------------------



-------------------------







----------

G+1

0.3

VDD-0.3

VDD

VOUT (V)

VIN (V)

0.3

VDD - 0.3 VDD

INL

OUT

O_linear

–

ONL

max V

4 V3





0.6V

–

---------------------------------

INL (V)

VIN (V)

0.3

VDD - 0.3 VDD

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