Data Sheet AD5749
Rev. C | Page 15 of 28
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 is shown
in Figure 5.
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 is
shown in Figure 23.
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 the
actual VOUT and the ideal VOUT 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 AD5749 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.
