AD5060 datasheet(14/24 Pages) AD

14 / 24 page

AD5040/AD5060

Rev. A | Page 14 of 24

TERMINOLOGY

Relative Accuracy

For the DAC, relative accuracy or integral nonlinearity (INL) is

a measure of the maximum deviation, in LSBs, from a straight

line passing through the endpoints of the DAC transfer

function. A typical AD5060 INL vs. code plot is shown in

Figure 4.

Differential Nonlinearity (DNL)

Differential nonlinearity is the difference between the measured

change and the ideal 1 LSB change between any two adjacent

codes. A specified differential nonlinearity of ±1 LSB maximum

ensures monotonicity. This DAC is guaranteed monotonic by

design. A typical AD5060 DNL vs. code plot is shown in Figure 5.

Offset Error

Offset error is a measure of the output error when zero code

(0x0000) is loaded to the DAC register. Ideally, the output

should be 0 V. The zero-code error is always positive in the

AD5040/AD5060 because the output of the DAC cannot go

below 0 V. This is due to a combination of the offset errors in

the DAC and output amplifier. Zero-code error is expressed

in mV.

Full-Scale Error

Full-scale error is a measure of the output error when full-scale

code (0xFFFF AD5060, 0x3FFF AD5040) is loaded to the DAC

error is expressed in percent of full-scale range.

Gain Error

This is a measure of the span error of the DAC. It is the devia-

tion in slope of the DAC transfer characteristic from ideal,

expressed as a percent of the full-scale range.

Total Unadjusted Error (TUE)

Total unadjusted error is a measure of the output error taking

all the various errors into account. A typical AD5060 TUE vs.

code plot is shown in Figure 6.

Offset Error Drift

This is a measure of the change in zero-code error with a

change in temperature. It is expressed in μV/°C.

Gain Error Drift

This is a measure of the change in gain error with changes in

temperature. It is expressed in (ppm of full-scale range)/°C.

Digital-to-Analog Glitch Impulse

Digital-to-analog glitch impulse is the impulse injected into the

analog output when the input code in the DAC register changes

state. It is normally specified as the area of the glitch in nV-s

and is measured when the digital input code is changed by

1 LSB at the worst case code 53786; see Figure 23 and Figure 24.

The expanded view in Figure 23 shows the glitch generated

following completion of the calibration routine; Figure 24

zooms in on this glitch.

Digital Feedthrough

Digital feedthrough is a measure of the impulse injected into

the analog output of the DAC from the digital inputs of the

DAC, but is measured when the DAC output is not updated. It

is specified in nV-s and measured with a full-scale code change

on the data bus—that is, from all 0s to all 1s, and vice versa.

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