AD5541A datasheet(13/20 Pages) AD

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Data Sheet

AD5541A

Rev. B | Page 13 of 20

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 7.

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 10.

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 20.

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 SCLK 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 19.

Power Supply Rejection Ratio (PSRR)

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

in the power supply voltage. The power supply rejection ratio is

expressed in terms of percent change in output per percent

change in VDD for full-scale output of the DAC. VDD is varied by

±10%.

Reference Feedthrough

Reference feedthrough is a measure of the feedthrough from the

VREF input to the DAC output when the DAC is loaded with all

0s. A 100 kHz, 1 V p-p is applied to VREF. Reference feedthrough

is expressed in mV p-p.

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