AD9233 datasheet(29/45 Pages) AD

29 / 45 page

AD9233

Rev. A | Page 28 of 44

EVALUATION BOARD

The AD9233 evaluation board provides all of the support

circuitry required to operate the ADC in its various modes and

configurations. The converter can be driven differentially

through a double balun configuration (default) or through the

AD8352 differential driver. The ADC can also be driven in a

single-ended fashion. Separate power pins are provided to

isolate the DUT from the AD8352 drive circuitry. Each input

configuration can be selected by proper connection of various

components. Figure 59 shows the typical bench characterization

setup used to evaluate the ac performance of the AD9233.

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 inte-

grated or broadband noise at the input is also necessary to achieve

the specified noise performance.

See Figure 60 to Figure 70 for the complete schematics and

layout diagrams that demonstrate the routing and grounding

techniques that should be applied at the system level.

POWER SUPPLIES

This evaluation board comes with a wall-mountable switching

power supply that provides a 6 V, 2 A maximum output. Simply

connect the supply to the rated 100 V ac to 240 V ac wall outlet

at 47 Hz to 63 Hz. The other end is a 2.1 mm inner diameter

jack that connects to the PCB at P500. Once on the PC board,

the 6 V supply is fused and conditioned before connecting to

five 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, L501, L503, L504,

L508, and L509 can be removed to disconnect the switching

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

board independently. Use P501 to connect a different supply for

each section.

Although at least one 1.8 V supply is needed with a 1 A current

capability for AVDD_DUT and DRVDD_DUT, it is recom-

mended that separate supplies be used for analog and digital.

To operate the evaluation board using the AD8352 option, a

separate 5.0 V analog supply is needed. The 5.0 V supply, or

AMP_VDD, should have a 1 A current capability. To operate

the evaluation board using the alternate SPI options, a separate

3.3 V analog supply is needed in addition to the other supplies.

The 3.3 V supply (AVDD_3.3V) should have a 1 A current

capability as well. Solder Jumpers J501, J502, and J505 allow the

user to combine these supplies. See Figure 64 for more details.

INPUT SIGNALS

When connecting the clock and analog source, use clean signal

generators with low phase noise, such as Rohde & Schwarz SMHU

or Agilent HP8644 signal generators or the equivalent. Use one

meter long, shielded, RG-58, 50 Ω coaxial cables for making

connections to the evaluation board. Enter the desired frequency

and amplitude for the ADC. Typically, most ADI evaluation

boards can accept a ~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. Analog Devices uses TTE®, Allen

Avionics, and K&L® types of band-pass filters. Connect the filter

directly to the evaluation board, if possible.

OUTPUT SIGNALS

The parallel CMOS outputs interface directly with Analog

Devices’ standard single-channel FIFO data capture board

(HSC-ADC-EVALB-SC). For more information on the FIFO

boards and their optional settings, visit www.analog.com/FIFO.

ROHDE & SCHWARZ,

SMHU,

2V p-p SIGNAL

SYNTHESIZER

ROHDE & SCHWARZ,

SMHU,

2V p-p SIGNAL

SYNTHESIZER

BAND-PASS

FILTER

AIN

CLK

12-BIT

PARALLEL

CMOS

USB

CONNECTION

AD9233

EVALUATION BOARD

HSC-ADC-EVALB-SC

FIFO DATA

CAPTURE

BOARD

RUNNING

ADC

ANALYZER

AND SPI

USER

SOFTWARE

1.8V

–+

5.0V

2.5V

6V DC

2A MAX

WALL OUTLET

100V TO 240V AC

47Hz TO 63Hz

SWITCHING

POWER

SUPPLY

–+

3.3V

–+

3.3V

–+

3.3V

SPI

Figure 59. Evaluation Board Connection

AD9233 Datasheet(PDF) 29 Page - Analog Devices

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