AD5748 datasheet(21/32 Pages) AD

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AD5748

Rev. A | Page 21 of 32

TERMINOLOGY

Total Unadjusted Error (TUE)

TUE is a measure of the output error taking all the various

errors into account: INL error, offset error, gain error, and

output drift over supplies, temperature, and time. TUE is

expressed as a percentage of full-scale range (% FSR).

Relative Accuracy or Integral Nonlinearity (INL)

INL is a measure of the maximum deviation, in % FSR, from a

straight line passing through the endpoints of the output driver

transfer function. A typical INL vs. input voltage plot can be

seen in Figure 5.

Bipolar Zero Error

Bipolar zero error is the deviation of the actual vs. ideal half-

scale output of 0 V/0 mA with a bipolar range selected. A plot

of bipolar zero error vs. temperature can be seen in Figure 10.

Bipolar Zero TC

Bipolar zero TC is a 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 the deviation of the actual full-scale analog

output from the ideal full-scale output. Full-scale error is

expressed as a percentage of full-scale range (% FSR).

Full-Scale TC

Full-scale TC is a measure of the change in the full-scale error

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

Gain Error

Gain error is a measure of the span error of the output. It is the

deviation in slope of the output transfer characteristic from the

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

can be seen in Figure 11.

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 FSR/°C.

Zero-Scale Error

Zero-scale error is the deviation of the actual zero-scale analog

output from the ideal zero-scale output. Zero-scale error is

expressed in millivolts (mV).

Zero-Scale TC

Zero-scale 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.

Offset Error

Offset error is a measurement of the difference between VOUT

(actual) and VOUT (ideal) expressed in millivolts (mV) in the

linear region of the transfer function. It can be negative or

positive.

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 half-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 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 expressed in V/μs.

Current Loop Voltage Compliance

Current loop voltage compliance is the maximum voltage at

the IOUT pin for which the output current is equal to the

programmed value.

Power-On Glitch Energy

Power-on glitch energy is the impulse injected into the analog

output when the AD5748 is powered on. It is specified as the

area of the glitch in nV-sec.

Power Supply Rejection Ratio (PSRR)

PSRR indicates how the output is affected by changes in the

power supply voltage.

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