AD5643R datasheet(19/28 Pages) AD

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AD5623R/AD5643R/AD5663R

Rev. A | Page 19 of 28

Digital Crosstalk

Digital crosstalk is the glitch impulse transferred to the output

of one DAC at midscale in response to a full-scale code change

(all 0s to all 1s and vice versa) in the input register of another

DAC. It is measured in standalone mode and is expressed

in nanovolts-second (nV-s).

Analog Crosstalk

Analog crosstalk is the glitch impulse transferred to the output

of one DAC due to a change in the output of another DAC. It is

measured by loading one of the input registers with a full-scale

code change (all 0s to all 1s and vice versa) while keeping LDAC

high. Then pulse LDAC low and monitor the output of the DAC

whose digital code was not changed. The area of the glitch is

expressed in nanovolts-second (nV-s).

DAC-to-DAC Crosstalk

DAC-to-DAC crosstalk is the glitch impulse transferred to the

output of one DAC due to a digital code change and subsequent

output change of another DAC. This includes both digital and

analog crosstalk. It is measured by loading one of the DACs

with a full-scale code change (all 0s to all 1s and vice versa) with

LDAC low and monitoring the output of another DAC. The

energy of the glitch is expressed in nanovolts-second (nV-s).

Multiplying Bandwidth

The amplifiers within the DAC have a finite bandwidth. The

multiplying bandwidth is a measure of this. A sine wave on the

reference (with full-scale code loaded to the DAC) appears on

the output. The multiplying bandwidth is the frequency at

which the output amplitude falls to 3 dB below the input.

Total Harmonic Distortion (THD)

Total harmonic distortion is the difference between an ideal

sine wave and its attenuated version using the DAC. The sine

wave is used as the reference for the DAC, and the THD is a

measurement of the harmonics present on the DAC output.

It is measured in decibels (dB).

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