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Preliminary Technical Data

AD5762R

Rev. PrA | Page 13 of 33

TERMINOLOGY

Relative Accuracy or Integral nonlinearity (INL)

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 7.

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. A

typical DNL vs. code plot can be seen in Figure 9.

Monotonicity

A DAC is monotonic if the output either increases or remains

constant for increasing digital input code. The AD5762R 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 (twos complement

coding). A plot of bipolar zero error vs. temperature can be seen in

Figure 22.

Bipolar Zero TC

Bipolar zero TC is the measure of the change in the bipolar zero

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

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 2 × VREF − 1 LSB. Full-scale error is expressed in

percentage of full-scale range.

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 (twos

complement coding) is loaded to the DAC register. Ideally, the

output voltage should be −2 × VREF. A plot of zero-scale error vs.

temperature can be seen in Figure 21.

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 limitation 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

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 percentage of the full-scale range. A plot of

gain error vs. temperature can be seen in Figure 23.

Total Unadjusted Error

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

considering all the various errors. A plot of total unadjusted

error vs. reference can be seen in Figure 19.

Zero-Scale Error TC

Zero-scale error TC is a measure of the change in zero-scale

error with a change in temperature. Zero-scale error TC is

expressed in ppm FSR/°C.

Gain Error TC

Gain error TC is a measure of the change in gain error with

changes in temperature. Gain Error TC is expressed in

(ppm of FSR)/°C.

Digital-to-Analog Glitch Energy

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 28).

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.

Power Supply Sensitivity

Power supply sensitivity indicates how the output of the DAC is

affected by changes in the power supply voltage.

DC Crosstalk

DC crosstalk 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, and is expressed in LSBs.

DAC-to-DAC Crosstalk

DAC-to-DAC crosstalk is the glitch impulse transferred to the

output of one DAC due to a digital code change and subsequent

output change of another DAC. This includes both digital and

analog crosstalk. It is measured by loading one of the DACs

with a full-scale code change (all 0s to all 1s and vice versa) with

LDAC low and monitoring the output of another DAC. The

energy of the glitch is expressed in nV-s.

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