AD5686 datasheet(17/28 Pages) AD

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Data Sheet

AD5686/AD5684

Rev. A | Page 17 of 28

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). 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-sec.

DAC-to-DAC Crosstalk

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

the output of one DAC in response 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 write to and

update commands while monitoring the output of another

channel that is at midscale. The energy of the glitch is

expressed in nV-sec.

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.

Total Harmonic Distortion (THD)

THD 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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