AD9864BCPZ datasheet(42/44 Pages) AD

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AD9864

105

BW (kHz)

120

140

160

100

MIN ATTEN WITH

24-BIT I/Q DATA

MAX ATTEN WITH

16-BIT I/Q DATA

MIN ATTEN WITH

16-BIT I/Q DATA

MAX ATTEN WITH

24-BIT I/Q DATA

fCLK = 18MSPS

Figure 74. Hung Mixer SNR vs. BW and VGA

LAYOUT EXAMPLE, EVALUATION BOARD, AND

SOFTWARE

The evaluation board and its accompanying software provide a

simple way to evaluate the AD9864. The block diagram in

Figure 75 shows the major blocks of the evaluation board,

which is designed to be flexible, allowing configuration for

different applications.

The power supply distribution block provides filtered, adjust-

able voltages to the various supply pins of the AD9864. In the

IF input signal path, component pads are available to implement

different IF impedance matching networks. The LO and CLK

signals can be externally applied or internally derived from a

user-supplied VCO module interface daughter board. The refer-

ence for the on-chip LO and CLK synthesizers can be applied via

the external fREF input or an on-board crystal oscillator.

The evaluation board is designed to interface to a PC via a

National Instruments NI 6533 digital IO card. An XILINX FPGA

formats the data between the AD9864 and digital I/O card.

MIXER

INPUT

DUT

INPUT

VCO

MODULE

INTERFACE

CRYSTAL

OSCILLATOR

(OPTIONAL)

IDT

FIFO

POWER SUPPLY

DISTRIBUTION

EPROM

CLK

INPUT

FREF

INPUT

XILINX

SPARTON

FPGA

AD9864

Figure 75. Evaluation Board Platform

Software developed using National Instruments’ LabVIEW™

(and provided as Microsoft® Windows® executable programs) is

supplied for the configuration of the SPI port registers and

evaluation of the AD9864 output data. These programs have a

convenient graphical user interface that allows for easy access

to the various SPI port configuration registers and frequency

analysis of the output data.

For more information on the AD9864 evaluation board, includ-

ing an example layout, please refer to the EVAL-AD9874EB

Data Sheet

(www.analog.com/Analog_Root/static/pdf/techSupport/AD987

4EB_0.pdf).

Rev. 0 | Page 42 of 44

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