MCP4726 datasheet(60/86 Pages) MICROCHIP

60 / 86 page

MCP4706/4716/4726

DS22272A-page 60

7.7

Integral Nonlinearity (INL)

The Integral nonlinearity (INL) error is the maximum

deviation of an actual transfer function from an ideal

transfer function (straight line).

In the MCP47X6, INL is calculated using two end points

(zero and full scale). INL can be expressed as a per-

centage of full scale range (FSR) or in a fraction of an

LSb. INL is also called relative accuracy. Equation 7-4

shows how to calculate the INL error in LSb and

Figure 7-2 shows an example of INL accuracy.

EQUATION 7-4:

INL ERROR

FIGURE 7-2:

INL Accuracy Example.

7.8

Differential Nonlinearity (DNL)

The Differential nonlinearity (DNL) error (see Figure 7-

3) is the measure of step size between codes in actual

transfer function. The ideal step size between codes is

1 LSb. A DNL error of zero would imply that every code

is exactly 1 LSb wide. If the DNL error is less than

1 LSb, the DAC guarantees monotonic output and no

missing codes. The DNL error between any two

adjacent codes is calculated as follows:

EQUATION 7-5:

DNL ERROR

FIGURE 7-3:

DNL Accuracy Example.

INL

OUT

Ideal

–

()

LSb

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

Where:

INL is expressed in LSb.

VIdeal

Code*LSb

VOUT

The output voltage measured with

a given DAC input code

010

001

000

Analog

Output

(LSb)

DAC Input Code

011

111

100

101

110

Ideal Transfer Function

Actual Transfer Function

INL = < -1 LSb

INL = 0.5 LSb

INL = - 1 LSb

DNL

ΔV

OUT

LSb

–

LSb

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

Where:

DNL is expressed in LSb.

ΔV

OUT

The measured DAC output

voltage difference between two

adjacent input codes.

010

001

000

Analog

Output

(LSb)

DAC Input Code

011

111

100

101

DNL = 2 LSb

DNL = 0.5 LSb

110

Ideal Transfer Function

Actual Transfer Function

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