MCP4021 datasheet(45/64 Pages) MICROCHIP

45 / 64 page

DS21945E-page 45

MCP4021/2/3/4

6.3

Operational Characteristics

Understanding the operational characteristics of the

device’s resistor components is important to the system

design.

6.3.1

ACCURACY

6.3.1.1

Integral Non-Linearity (INL)

INL error for these devices is the maximum deviation

between an actual code transition point and its

corresponding ideal transition point after offset and

gain errors have been removed. These endpoints are

from 0x00 to 0x3F. Refer to Figure 6-5.

Positive INL means higher resistance than ideal.

Negative INL means lower resistance than ideal.

FIGURE 6-5:

INL Accuracy.

6.3.1.2

Differential Non-Linearity (DNL)

DNL error is the measure of variations in code widths

from the ideal code width. A DNL error of zero would

imply that every code is exactly 1 LSb wide.

FIGURE 6-6:

DNL Accuracy.

6.3.1.3

Ratiometric Temperature Coefficient

The ratiometric temperature coefficient quantifies the

error in the ratio RAW/RWB due to temperature drift.

This is typically the critical error when using a

potentiometer device (MCP4021 and MCP4023) in a

voltage divider configuration.

6.3.1.4

Absolute Temperature Coefficient

The absolute temperature coefficient quantifies the

error in the end-to-end resistance (nominal resistance

RAB) due to temperature drift. This is typically the

critical error when using a rheostat device (MCP4022

and MCP4024) in an adjustable resistor configuration.

111

110

101

100

011

010

001

000

Digital

Input

Code

Actual

Transfer

Function

INL < 0

Ideal Transfer

Function

INL < 0

Digital Pot Output

111

110

101

100

011

010

001

000

Digital

Input

Code

Actual

Transfer

Function

Ideal Transfer

Function

Narrow Code < 1 LSb

Wide Code, > 1 LSb

Digital Pot Output

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