AD9837 datasheet(21/28 Pages) AD

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AD9837

Rev. 0 | Page 21 of 28

EVALUATION BOARD

The AD9837 evaluation board allows designers to evaluate the

high performance AD9837 DDS modulator with a minimum

of effort.

SYSTEM DEMONSTRATION PLATFORM

The system demonstration platform (SDP) is a hardware and

software evaluation tool for use in conjunction with product

evaluation boards. The SDP board is based on the Blackfin®

ADSP-BF527 processor with USB connectivity to the PC

through a USB 2.0 high speed port. For more information,

see the SDP board product page.

Note that the SDP board is sold separately from the AD9837

evaluation board.

AD9837 TO SPORT INTERFACE

The Analog Devices SDP board has a SPORT serial port that is

used to control the serial inputs to the AD9837. The connections

are shown in Figure 28.

AD9837

FSYNC

SCLK

SDATA

ADSP-BF527

SPORT_TFS

SPORT_TSCLK

SPORT_DT0

Figure 28. SDP to AD9837 Interface

EVALUATION KIT

The DDS evaluation kit includes a populated, tested AD9837

printed circuit board (PCB). The schematics of the evaluation

board are shown in Figure 30 and Figure 31.

The software provided in the evaluation kit allows the user to

easily program the AD9837 (see Figure 29). The evaluation soft-

ware runs on any IBM-compatible PC with Microsoft® Windows®

software installed (including Windows 7). The software is com-

patible with both 32-bit and 64-bit operating systems.

More information about the evaluation software is available on

the software CD and on the AD9837 product page.

Figure 29. AD9837 Evaluation Software Interface

CRYSTAL OSCILLATOR VS. EXTERNAL CLOCK

The AD9837 can operate with master clocks up to 16 MHz.

A 16 MHz oscillator is included on the evaluation board. This

oscillator can be removed and, if required, an external CMOS

clock can be connected to the part. Options for the general

oscillator include the following:

•

AEL 301-Series oscillators, AEL Crystals

•

SG-310SCN oscillators, Epson Electronics

POWER SUPPLY

Power to the AD9837 evaluation board can be provided from

the USB connector or externally through pin connections. The

power leads should be twisted to reduce ground loops.

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