AD5734R datasheet(12/20 Pages) AD

12 / 20 page

AD5726

Rev. 0 | Page 12 of 20

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 6.

Differential Nonlinearity (DNL)

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 Figure 7.

Monotonicity

A DAC is monotonic if the output either increases or remains

constant for increasing digital input code. The AD5726 is

monotonic over its full operating temperature range

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 should be

VREFP − 1 LSB. Full-scale error is expressed in LSBs. A plot of

full-scale error vs. temperature can be seen in Figure 12.

Zero-Scale Error

Zero-scale error is the error in the DAC output voltage when

0x0000 (straight binary coding) is loaded to the DAC register.

Ideally, the output voltage should be VREFN. A plot of zero-scale

error vs. temperature can be seen in Figure 13.

Zero-Scale Error TC

This 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.

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 DAC 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.

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-sec and measured with a full-scale code

change on the data bus.

Power Supply Sensitivity

Power supply sensitivity indicates how the output of the DAC is

affected by changes in the power supply voltage.

Analog 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 dB.

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