ADR435 datasheet(13/24 Pages) AD

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Data Sheet

AD5601/AD5611/AD5621

Rev. G | Page 13 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 func-

tion. See Figure 5 to Figure 7 for plots of typical INL vs. code.

Differential Nonlinearity

Differential nonlinearity (DNL) 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. See Figure 11 to Figure 13 for plots of

typical DNL vs. code.

Zero-Code Error

Zero-code 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

AD5601/AD5611/AD5621 because the output of the DAC cannot

go below 0 V. Zero-code error is due to a combination of the

offset errors in the DAC and output amplifier. Zero-code error

is expressed in mV. See Figure 28 for a plot of zero-code error

vs. temperature.

Full-Scale Error

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

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

should be VDD − 1 LSB. Full-scale error is expressed in mV. See

Figure 28 for a plot of full-scale error vs. temperature.

Gain Error

Gain error is a measure of the span error of the DAC. It is the

deviation in slope of the DAC transfer characteristic from the

ideal, expressed as a percent of the full-scale range.

Total Unadjusted Error

Total unadjusted error (TUE) is a measure of the output error,

taking all the various errors into account. See Figure 8 to

Figure 10 for plots of typical TUE vs. code.

Zero-Code Error Drift

Zero-code error drift is a measure of the change in zero-code

error with a change in temperature. It is expressed in µV/°C.

Gain Temperature Coefficient

Gain temperature coefficient 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 major carry transition (0x2000 to 0x1FFF). See

Figure 19.

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 is measured with a full-scale code

change on the data bus—from all 0s to all 1s and vice versa.

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