AD9764 datasheet(17/22 Pages) AD

17 / 22 page

REV. B

AD9764

–17–

of the DAC can be evaluated. Nonlinearities associated with the

DAC will create spurious tones of which some may fall back into

the “empty” channel thus limiting a channel’s carrier-to-noise

ratio. Other spurious components falling outside the band of

interest may also be important, depending on the system’s spectral

mask and filtering requirements.

This particular test vector was centered around one-half the

Nyquist bandwidth (i.e., fCLOCK/4) with a passband of fCLOCK/16.

Centering the tones at a much lower region (i.e., fCLOCK/10)

would lead to an improvement in performance while centering

the tones at a higher region (i.e., fCLOCK/2.5) would result in a

degradation in performance. Figure 40a shows the SFDR vs.

amplitude at different sample rates up to the Nyquist frequency

while Figure 40b shows the SFDR vs. amplitude within the

passband of the test vector. In assessing a DAC’s multitone

performance, it is also recommended that several units be tested

under exactly the same conditions to determine any performance

variability.

AOUT – dBFS

–20

–15

–10

–5

10 MSPS

100 MSPS

20 MSPS

50 MSPS

Figure 40a. Multitone SFDR vs. AOUT (Up to Nyquist)

10 MSPS

20 MSPS

50 MSPS

100 MSPS

AOUT – dBFS

–20

–15

–10

–5

Figure 40b. Multitone SFDR vs. AOUT (Within Multitone

Passband)

AD9764 EVALUATION BOARD

General Description

The AD9764-EB is an evaluation board for the AD9764 14-bit

DAC converter. Careful attention to layout and circuit design,

combined with a prototyping area, allows the user to easily and

effectively evaluate the AD9764 in any application where high

resolution, high speed conversion is required.

This board allows the user the flexibility to operate the AD9764

in various configurations. Possible output configurations include

transformer coupled, resistor terminated, inverting/noninverting

and differential amplifier outputs. The digital inputs are designed

to be driven directly from various word generators with the

onboard option to add a resistor network for proper load termi-

nation. Provisions are also made to operate the AD9764 with

either the internal or external reference or to exercise the power-

down feature.

Refer to the application note AN-420, Using the AD9760/AD9764/

AD9764-EB Evaluation Board for a thorough description and

operating instructions for the AD9764 evaluation board.

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