ADT7516 datasheet(12/44 Pages) AD

12 / 44 page

ADT7516/ADT7517/ADT7519

Rev. A | Page 12 of 44

DAC-to-DAC Crosstalk

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

due to a digital code change and subsequent output change of

another DAC. This includes both digital and analog crosstalk. It

is measured by loading one of the DACs with a full-scale code

change (all 0s to all 1s and vice versa) with LDAC low and

monitoring the output of another DAC. 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

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 measure of the

harmonics present on the DAC output, expressed in dB.

Round Robin

This term is used to describe the ADT7516/ADT7517/

ADT7519 cycling through the available measurement channels

in sequence, taking a measurement on each channel.

DAC Output Settling Time

This is the time required, following a prescribed data change, for

the output of a DAC to reach and remain within ±0.5 LSB of the

final value. A typical prescribed change is from 1/4 scale to

3/4 scale.

AMPLIFIER

FOOTROOM

LOWER

DEADBAND

CODES

NEGATIVE

OFFSET

ERROR

GAIN ERROR

OFFSET ERROR

ACTUAL

OUTPUT

VOLTAGE

NEGATIVE

OFFSET

ERROR

DAC CODE

IDEAL

Figure 8. DAC Transfer Function with Negative Offset

ACTUAL

GAIN ERROR

OFFSET ERROR

UPPER

DEADBAND

CODES

OUTPUT

VOLTAGE

POSITIVE

OFFSET

ERROR

DAC CODE

FULL SCALE

IDEAL

Figure 9. DAC Transfer Function with Positive Offset (VREF = VDD)

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