AD5671R datasheet(22/32 Pages) AD

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AD5674/AD5674R/AD5679/AD5679R

Data Sheet

Rev. B | Page 22 of 32

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. DAC-to-DAC crosstalk

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 when monitoring the output of the victim

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

in nV-sec.

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. THD is measured in dB.

Voltage Reference TC

Voltage reference TC is a measure of the change in the reference

output voltage with a change in temperature. The voltage

reference TC is calculated using the box method, which defines

the TC as the maximum change in the reference output over a

given temperature range, expressed in ppm/°C, shown in the

following equation:

(

)

()

REF MAX

REF MIN

REF NOM

Temperature Range





−













where:

VREF (MAX) is the maximum reference output measured over the

total temperature range.

VREF (MIN) is the minimum reference output measured over the

total temperature range.

VREF (NOM) is the nominal reference output voltage, 2.5 V.

Temperature Range is the specified temperature range of −40°C

to +125°C.

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