AD9600 datasheet(49/73 Pages) AD

49 / 73 page

AD9600

Rev. B | Page 48 of 72

EVALUATION BOARD

The AD9600 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 using the

double-balun configuration (default) or an 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 properly connecting various components (see Figure 74 to

Figure 83). Figure 73 shows the typical bench characterization

setup used to evaluate the ac performance of the AD9600.

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 74 to Figure 91 for the complete schematics and

layout diagrams that demonstrate the routing and grounding

techniques that should be applied at the system level.

POWER SUPPLIES

The evaluation board comes with 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 output of the supply is a 2.1 mm inner diameter

circular jack that connects to the PCB at J16. Once on the PC

board, the 6 V supply is fused and conditioned before connecting

to six low dropout linear regulators that supply the proper bias

to each of the various sections of the board.

The evaluation board can be operated using external supplies

by removing L1, L3, L4, and L13 to disconnect the voltage

regulators supplied from the switching power supply. This

enables the user to individually bias each section of the board.

Use P3 and P4 to connect a different supply for each section.

At least one 1.8 V supply is needed with a 1 A current capability

for AVDD and DVDD; a separate 1.8 V to 3.3 V supply is

recommended for DRVDD. To operate the evaluation board

using the AD8352 driver, a separate 5.0 V supply (AMP VDD)

with a 1 A current capability is needed. To operate the evaluation

board using the alternative SPI options, a separate 3.3 V analog

supply (VS) is needed in addition to the other supplies. The

3.3 V supply (VS) should also have a 1 A current capability.

Using Solder Jumper SJ35 allows the user to separate AVDD

and DVDD if desired.

INPUT SIGNALS

When connecting the clock and analog sources to the evaluation

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

Rohde & Schwarz SMA100A or Agilent 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 for the ADC.

The AD9600 evaluation board from Analog Devices can accept

a ~2.8 V p-p or a 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. Connect the filter

directly to the evaluation board, if possible.

OUTPUT SIGNALS

The parallel CMOS outputs interface directly with the Analog

Devices standard ADC data capture board (HSC-ADC-

EVALCZ). For more information on the ADC data capture

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

USB

CONNECTION

AD9600

EVALUATION BOARD

10-BIT

PARALLEL

CMOS

10-BIT

PARALLEL

CMOS

HSC-ADC-EVALCZ

FPGA BASED

DATA

CAPTURE BOARD

PC RUNNING

VISUAL ANALOG

AND SPI

CONTROLLER

SOFTWARE

1.8V

–+

5.0V

3.3V

6V DC

2A MAX

WALL OUTLET

100V AC TO 240V AC

47Hz TO 63Hz

SWITCHING

POWER

SUPPLY

–+

3.3V

–+

3.3V

SPI

ROHDE & SCHWARZ,

SMA100A,

2V p-p SIGNAL

SYNTHESIZER

CLK

ROHDE & SCHWARZ,

SMA100A,

2V p-p SIGNAL

SYNTHESIZER

AINB

BAND-PASS

FILTER

ROHDE & SCHWARZ,

SMA100A,

2V p-p SIGNAL

SYNTHESIZER

AINA

BAND-PASS

FILTER

Figure 73. Evaluation Board Connection

AD9600 Datasheet(PDF) 49 Page - Analog Devices

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