AD5672R datasheet(23/34 Pages) AD

23 / 34 page

Data Sheet

AD5672R/AD5676R

Rev. B | Page 23 of 34

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 first 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 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 write to and update commands

while 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. It is measured in dB.

Voltage Reference Temperature Coefficient (TC)

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

output voltage with a change in temperature. The reference TC

is calculated using the box method, which defines the TC as the

maximum change in the reference output over a given tempera-

ture range expressed in ppm/°C, as follows:

)

(

)

(

)

(













−

Range

Temp

NOM

REF

MIN

REF

MAX

REF

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.

Temp Range is the specified temperature range of −40°C to

+125°C.

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