AD5647RBCPZ-R2 datasheet(19/32 Pages) AD

19 / 32 page

AD5627R/AD5647R/AD5667R, AD5627/AD5667

Rev. 0 | Page 19 of 32

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 executing a

software LDAC and monitoring 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

DAC-to-DAC crosstalk 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) with LDAC low 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 multiplying bandwidth is a measure of the finite bandwidth

of the amplifiers within the DAC. 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)

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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