AD5422 datasheet(17/29 Pages) AD

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Preliminary Technical Data

AD5420

Rev. PrD | Page 17 of 29

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 (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 8.

Monotonicity

A DAC is monotonic if the output either increases or remains

constant for increasing digital input code. The AD5724R/

AD5734R/AD5754R are monotonic over their 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

full-scale − 1 LSB. Full-scale error is expressed in percent of

full-scale range (% FSR).

Zero-Scale 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.

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 ideal

expressed in % FSR. A plot of gain error vs. temperature can be

seen in Table TBD

Gain TC

This is a measure of the change in gain error with changes in

temperature. Gain Error TC is expressed in ppm FSR/°C.

Total Unadjusted Error

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

taking all the various errors into account, namely INL error,

offset error, gain error, and output drift over supplies,

temperature, and time. TUE is expressed in % FSR.

Current Loop Voltage Compliance

The maximum voltage at the IOUT pin for which the output

currnet will be equal to the programmed value.

Power Supply Rejection Ratio (PSRR)

PSRR indicates how the output of the DAC is affected by

changes in the power supply voltage.

Reference TC

Reference TC is a measure of the change in the reference output

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

Line Regulation

Line regulation is the change in reference output voltage due to

a specified change in supply voltage. It is expressed in ppm/V.

Load Regulation

Load regulation is the change in reference output voltage due to

a specified change in load current. It is expressed in ppm/mA.

Thermal Hysteresis

Thermal hysteresis is the change of reference output voltage

after the device is cycled through temperatures from +25°C to

−40°C to +85°C and back to +25°C. This is a typical value from

a sample of parts put through such a cycle. See Table TBDfor a

histogram of thermal hysteresis.

HYS

(

−

(

)

(

−

HYS

ppm

where:

(25°C) = VO at 25°C

VO_TC

= VO at 25°C after temperature cycle

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