AD9259_17 datasheet(36/53 Pages) AD

36 / 53 page

Data Sheet

AD9259

Rev. E | Page 35 of 52

EVALUATION BOARD

The AD9259 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 using a

transformer (default) or a AD8332 driver. The ADC can also be

driven in a single-ended fashion. Separate power pins are provided

to isolate the DUT from the drive circuitry of the AD8332. Each

input configuration can be selected by changing the connection

of various jumpers (see Figure 62 to Figure 66). Figure 60 shows

the typical bench characterization setup used to evaluate the ac

performance of the AD9259. It is critical that the signal sources

used for the analog input and clock have very low phase noise

(<1 ps rms jitter) to realize the optimum 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 62 to Figure 70 for the complete schematics and

layout diagrams demonstrating the routing and grounding

techniques that should be applied at the system level.

POWER SUPPLIES

This evaluation board has a wall-mountable switching power

supply that provides a 6 V, 2 A maximum output. Connect the

supply to the rated 100 V ac to 240 V ac wall outlet at 47 Hz to

63 Hz. The other end of the supply is a 2.1 mm inner diameter

jack that connects to the PCB at P503. Once on the PC board,

the 6 V supply is fused and conditioned before connecting to

three low dropout linear regulators that supply the proper bias

to each of the various sections on the board.

When operating the evaluation board in a nondefault condition,

L504 to L507 can be removed to disconnect the switching

power supply. This enables the user to bias each section of the

board individually. Use P501 to connect a different supply for

each section. At least one 1.8 V supply is needed for AVDD_DUT

and DRVDD_DUT; however, it is recommended that separate

supplies be used for analog and digital signals and that each

supply have a current capability of 1 A. To operate the evaluation

board using the VGA option, a separate 5.0 V analog supply

(AVDD_5 V) is needed. To operate the evaluation board using

the SPI and alternate clock options, a separate 3.3 V analog

supply (AVDD_3.3 V) is needed in addition to the other

supplies.

INPUT SIGNALS

When connecting the clock and analog source to the evaluation

board, use clean signal generators with low phase noise, such as

Rohde & Schwarz SMA or HP8644 signal generators or the

equivalent, as well as a 1 m, shielded, RG-58, 50 Ω coaxial cable.

Enter the desired frequency and amplitude from the ADC speci-

fications tables. Typically, most Analog Devices, Inc., evaluation

boards can accept approximately 2.8 V p-p or 13 dBm sine wave

input for the clock. When connecting the analog input source, it

is recommended to use a multipole, narrow-band, band-pass

filter with 50 Ω terminations. Good choices of such band-pass

filters are available from TTE, Allen Avionics, and K&L

Microwave, Inc. The filter should be connected directly to the

evaluation board if possible.

OUTPUT SIGNALS

The default setup uses the Analog Devices HSC-ADC-FIFO5-

INTZ to interface with the Analog Devices standard dual-

channel FIFO data capture board (HCS-ADC-EVALCZ). Two

of the eight channels can be evaluated at the same time. For

more information on the channel settings and optional settings

of these boards, visit www.analog.com/FIFO.

ROHDE & SCHWARZ,

SMA,

2V p-p SIGNAL

SYNTHESIZER

ROHDE & SCHWARZ,

SMA,

2V p-p SIGNAL

SYNTHESIZER

BAND-PASS

FILTER

XFMR

INPUT

CLK

CH A TO CH D

14-BIT

SERIAL

LVDS

USB

CONNECTION

AD9259

EVALUATION BOARD

HSC-ADC-EVALCZ

FIFO DATA

CAPTURE

BOARD

RUNNING

ADC

ANALYZER

AND SPI

USER

SOFTWARE

1.8V

–

5.0V

1.8V

6V DC

2A MAX

WALL OUTLET

100V TO 240V AC

47Hz TO 63Hz

SWITCHING

POWER

SUPPLY

–

3.3V

–

3.3V

SPI

INTERPOSER

BOARD

SPI

Figure 60. Evaluation Board Connection

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