ADT7516 datasheet(18/44 Pages) AD

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ADT7516/ADT7517/ADT7519

Rev. B | Page 18 of 44

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) while keeping

LDAC high. Then pulse LDAC low and monitor 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

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 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 measure of the

harmonics present on the DAC output, expressed in dB.

Round Robin

The term round robin 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

DAC output settling time 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 40. 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 41. DAC Transfer Function with Positive Offset (VREF = VDD)

ADT7516 Datasheet(PDF) 18 Page - Analog Devices

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