MCP6G01-ESLASHMS datasheet(7/38 Pages) MICROCHIP

7 / 38 page

DS22004B-page 7

MCP6G01/1R/1U/2/3/4

1.1

DC Output Voltage Specs / Model

1.1.1

IDEAL MODEL

The ideal SGA output voltage (VOUT) is (see Figure 1-3):

EQUATION 1-1:

This equation holds when there are no gain or offset

errors.

1.1.2

LINEAR MODEL

The SGA’s linear region of operation is modeled by the

line VO_LIN shown in Figure 1-3. VO_LIN includes offset

and gain errors, but does not include non-linear effects.

EQUATION 1-2:

This line’s endpoints are 0.3V from the supply rails

(VO_ID = 0.3V and VDD – 0.3V). The gain error and

input offset voltage specifications (in the electrical

specifications) relate to Figure 1-3 as follows:

EQUATION 1-3:

The input offset specification describes VOS at

G=+1 V/V.

The DC Gain Drift (

ΔG/ΔTA) can be calculated from the

change in gE across temperature. This is shown in the

following equation:

EQUATION 1-4:

FIGURE 1-3:

Output Voltage Model.

1.1.3

OUTPUT NON-LINEARITY

Figure 1-4 shows the Integral Non-Linearity (INL) of the

output voltage. INL is the output non-linearity error not

explained by VO_LIN:

EQUATION 1-5:

The output non-linearity specification (in the Electrical

Specifications, with units of % of FSR) is related to

Figure 1-4 by:

EQUATION 1-6:

Note that the Full Scale Range (FSR) is VDD –0.6V

(0.3V to VDD –0.3V).

Where:

G is the nominal gain

VO_ID

GVIN

VREF

VSS

VO_LIN

G 1 gE

() V

0.3V

------------ VOS

–

⎝⎠

⎛⎞ 0.3V

VREF

VSS

Where:

G is the nominal gain

gE is the gain error

VOS is the input offset voltage

100%

V2 V1

–

VDD 0.6V

–

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

⋅

VOS

G 1 gE

()

-------------------------,

Where:

VOUT VO_ID,

–

VO_ID

0.3V

VOUT VO_ID,

–

VO_ID

VDD 0.3V

–

⁄

----------,

⋅

in units of V/V/°C

⁄

100%

----------,

⋅

in units of %/°C

0.3

VDD-0.3

VDD

V O

VOUT (V)

VIN (V)

0.3

VDD-0.3 VDD

V O

_ID

V O

INL

VOUT VO_LIN

–

VONL

100%

max V3 V4

()

VDD 0.6V

–

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

⋅

max INL

–

()

Where:

max INL

()

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