MCP48FVB08 datasheet(105/112 Pages) MICROCHIP

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DS20006362A-page 105

MCP48FXBX4/8

B.7

Offset Error (EOS)

The Offset Error is the delta voltage of the VOUT voltage

from the ideal output voltage at the specified code. This

code is specified where the output amplifier is in the

linear operating range; for the MCP48FXBX4/8, we

specify code 100 (decimal). Offset error does not

include Gain Error, see Figure B-2.

This error is expressed in mV. Offset Error can be

negative or positive. The Offset Error can be calibrated

by software in application circuits.

FIGURE B-2:

Offset Error and Zero-Scale

Error.

B.8

Offset Error Drift (EOSD)

The Offset Error Drift is the variation in Offset Error due

to a change in ambient temperature. The Offset Error

Drift is typically expressed in ppm/°C or µV/°C.

B.9

Gain Error (EG)

Gain Error is a calculation based on the ideal slope

using the voltage boundaries for the linear range of the

output driver (ex.: code 100 and code 4000); see

Figure B-3. The Gain Error calculation nullifies the

device’s Offset Error.

Gain Error indicates how well the slope of the actual

transfer function matches the slope of the ideal transfer

function. Gain Error is usually expressed as a percent

of full-scale range (% of FSR) or in LSb. FSR is the

ideal full-scale voltage of the DAC (see Equation B-5).

FIGURE B-3:

Gain Error and Full-Scale

Error Example.

EQUATION B-5:

EXAMPLE GAIN ERROR

B.10

Gain Error Drift (EGD)

The Gain Error Drift is the variation in Gain Error due to

a change in ambient temperature. Gain Error Drift is

typically expressed in ppm/°C (of FSR).

Ideal Transfer

Actual

DAC Input Code

Zero-Scale

Error (EZS)

Offset

Function

100

4000

Error (EOS)

Transfer

Function

Ideal Transfer

Actual

DAC Input Code

Full-Scale

Error (EFS)

Gain Error (EG)

Function

100

4000

4095

VREF

Transfer

Function

(@ Code = 4000)

Ideal Transfer

Function Shifted by

Offset Error

(crosses at start of

defined linear range)

Where:

EG is expressed in % of FSR.

VOUT(@4000) = The measured DAC output

voltage at the specified code.

VOUT_Ideal(@4000) = The calculated DAC output

voltage at the specified code

(4000 * VLSb(Ideal)).

VOS = Measured offset voltage.

VFull-Scale Range = Expected full-scale output

value (such as the VREF

voltage).

VOUT(@4000) VOS

–

VOUT_Ideal(@4000)

–



VFull-Scale Range

---------------------------------------------------------------------------------------------------------------------- 100

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