AD5644R datasheet(19/28 Pages) AD

19 / 28 page

AD5624R/AD5644R/AD5664R

Rev. A | Page 19 of 28

Analog Crosstalk

This 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). Then execute a software LDAC

and monitor the output of the DAC whose digital code was not

changed. The area of the glitch is expressed in nV-s.

DAC-to-DAC Crosstalk

This is the glitch impulse transferred to the output of one DAC

due to a digital code change and subsequent analog output

change of another DAC. It is measured by loading the attack

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

versa) using the command write to and update while

monitoring the output of the victim channel that is at midscale.

The energy of the glitch is expressed in 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)

This 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 dB.

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