AD5641 datasheet(7/20 Pages) AD

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Preliminary Technical Data

AD5641

Rev. PrC | Page 7 of 20

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 INL versus code plot can be seen in Figure 4.

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. A typical DNL versus code plot can be

seen in Figure 7.

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

AD5641, 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. A plot of zero-code error versus temperature can be seen in

Figure 6.

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 percent

of full-scale range. A plot of full-scale error versus temperature

can be seen in Figure 6.

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 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. A typical TUE versus

code plot can be seen in Figure 5.

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 Error Drift

Gain error drift 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 (0x7FFF to 0x8000). See

Figure 18.

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, that is, from all 0s to all 1s and vice versa.

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