AD5541A/AD5542A/AD5512A

Preliminary Technical Data

Rev. P

rA | Page 12 of 24

TERMINOLOGY

Relative Accuracy or Integral Nonlinearity (INL)

For the DAC, relative accuracy or 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 is shown in Figure 14.

Differential Nonlinearity (DNL)

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 mono-

tonicity. A typical DNL vs. code plot is shown in Figure 17.

Gain Error

Gain error is the difference between the actual and ideal analog

output range, expressed as a percent of the full-scale range.

It is the deviation in slope of the DAC transfer characteristic

from ideal.

Gain Error Temperature Coefficient

Gain error temperature coefficient is a measure of the change

in gain error with changes in temperature. It is expressed in

ppm/°C.

Zero Code Error

Zero code error is a measure of the output error when zero code

is loaded to the DAC register.

Zero Code Temperature Coefficient

This is a measure of the change in zero code error with a change

in temperature. It is expressed in mV/°C.

Digital-to-Analog Glitch Impulse

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-sec

and is measured when the digital input code is changed by

1 LSB at the major carry transition. A digital-to-analog glitch

impulse plot is shown in Figure 27.

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 it is measured when the DAC output is not updated.

CS is held high while the CLK and DIN signals are toggled. It

is specified in nV-sec and is measured with a full-scale code

change on the data bus, that is, from all 0s to all 1s and vice

versa. A typical digital feedthrough plot is shown in Figure 26.

Power Supply Rejection Ratio (PSRR)

PSRR indicates how the output of the DAC is affected by changes

in the power supply voltage. Power-supply rejection ratio is

quoted in terms of percent change in output per percent change

Reference Feedthrough

Reference feedthrough is a measure of the feedthrough from the

is expressed in mV p-p.