AD9289BBC datasheet(21/33 Pages) AD

21 / 33 page

AD9289

Rev. 0 | Page 20 of 32

EVALUATION BOARD

The AD9289 evaluation board provides all of the support cir-

cuitry required to operate the ADC in its various modes and

configurations. The converter can be driven differentially

through a transformer (default) or the AD8351 driver. Provi-

sions have also been made to drive the ADC single-ended.

Separate power pins are provided to isolate the DUT from the

support circuitry. Each input configuration can be selected by

proper connection of various jumpers (refer to the schematics).

Figure 37 shows the typical bench characterization setup used

to evaluate the ac performance of the AD9289. It is critical that

the signal sources that are used have very low phase noise

(< 1 ps rms jitter) to realize the ultimate performance of the

converter. Proper filtering of the analog input signal to

remove harmonics and lower the integrated or broadband

noise at the input is also necessary to achieve the specified

noise performance.

See Figure 37 to Figure 47 for complete schematics and layout

plots, which demonstrate the routing and grounding techniques

that should be applied at the system level.

ROHDE AND SCHWARZ,

SMHU,

2V p-p SIGNAL

SYNTHESIZER

ROHDE AND SCHWARZ,

SMHU,

2V p-p SIGNAL

SYNTHESIZER

BAND-PASS

FILTER

3.0V

–+

–

–+

3.3V

XFMR

INPUT

CLK

CHA–CHD

8-BIT

SERIAL

LVDS

2 CH

8-BIT

PARALLEL

CMOS

USB

CONNECTION

AD9289

EVALUATION BOARD

HSC-ADC-FPGA

HIGH-SPEED

DE-SERIALIZATION

BOARD

HSC-ADC-EVAL-DC

FIFO DATA

CAPTURE

BOARD

RUNNING

ADC

ANALYZER

3.0V

Figure 37. Evaluation Board Connections

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