AD5764CSU datasheet(13/27 Pages) AD

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Preliminary Technical Data

Rev. PrA 15-Nov-04| Page 13 of 27

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 vs. code plot can be seen in Figure ?.

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 vs. code plot can be seen

in Figures ?.

Monotonicity

A DAC is monotonic, if the output either increases or remains

constant for increasing digital input code. The AD5744/64 is

monotonic over its full operating temperature range

Bipolar Zero Error

Bipolar zero error is the deviation of the analog output from the

ideal half-scale output of 0 V when the DAC register is loaded

with 0x8000 (Offset Binary coding) or 0x0000 (2sComplement

coding)

Full-Scale Error

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

code is loaded to the DAC register. Ideally the output voltage

should be full scale value – 1 LSB. Full-scale error is expressed

in percentage of full-scale range. A plot of full-scale error vs.

temperature can be seen in Figure ?.

Negative Full-Scale Error / Zero Scale Error

Negative full-scale error is the error in the DAC output voltage

when 0x0000 (Offset Binary coding) or 0x8000 (2sComplement

coding) is loaded to the DAC register. Ideally the output voltage

should be negative full scale value – 1 LSB.

Output Voltage Settling Time

Output voltage settling time is the amount of time it takes for

the output to settle to a specified level for a full-scale input

change.

Slew Rate

The slew rate of a device is a limatation in the rate of change of

the output voltage. The output slewing speed of a voltage-

output D/A converter is usually limited by the slew rate of the

amplifier used at its output. Slew rate is measured from 10% to

90% of the output signal and is given in V/µs.

Gain Error

This 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 percentage 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 vs.

code plot can be seen in Figure ?.

Zero-Code 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 secs

and is measured when the digital input code is changed by

1 LSB at the major carry transition (7FFF Hex to 8000 Hex). See

Figure ?.

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 secs and measured with a full-scale code change

on the data bus, i.e., from all 0s to all 1s and vice versa.

Power Supply Sensitivity

Power supply sensitivity indicates how the output of the DAC is

affected by changes in the power supply voltage.

DC Crosstalk

This is the dc change in the output level of one DAC in response

to a change in the output of another DAC. It is measured with a

full-scale output change on one DAC while monitoring another

DAC. It is expressed in µV.

DAC-to-DAC Crosstalk

This is the glitch impulse transferred to the output of one DAC

due to a digital code change and subsequent output change of

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