AD9874_EvalBoard_Rev0| Application Note
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GENERAL DESCRIPTION
Evaluation Board for AD9874 EVAL-AD9874EB
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 reference 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 series digital IO card. A XILINX FPGA formats the data between the AD9874 and digital I/O board. Software, developed using National Instruments' LabVIEWTM and provided as Windows executable programs, is supplied for the configuration of the SPI port registers and analysis of the AD9874's output data. This software provides a convenient graphical user interface, allowing easy access to the various SPI port configuration registers along with real-time frequency and time domain analysis of its output data.
The evaluation board for the AD9874 and its accompanying software provide a simple means to evaluate this highly integrated IC. The AD9874 is a general-purpose IF subsystem that digitizes a low level 10 MHz 300 MHz IF input with signal bandwidths ranging from 6.8 kHz to 270 kHz. The signal chain within the IC consists of a low noise amplifier, a mixer, a variable gain amplifier, a band-pass - analog-to-digital converter, and a decimation filter with programmable decimation factor. Auxiliary blocks include clock and LO synthesizers as well as a serial peripheral interface (SPI) port. The functional block diagram shows the major blocks of the evaluation board. The evaluation board is designed to be flexible, allowing the user to configure it for different potential applications. The power supply distribution block provides filtered, adjustable voltages to the various supply pins of the AD9874. In the IF input
FUNCTIONAL BLOCK DIAGRAM
J2 IFIN
J5 LO_IN TB2
IF MATCHING NETWORK
LO VCO MODULE INTERFACE
MIXER OUT J3 JP23 JP22 AD9874
JP15 SW2 JP25 CRYSTAL OSC.
FREF
J1
JP24 TB3 AD9874 REVC JP18
VDIRECT
ANALOG DEVICES
U12 XILINX FPGA IDT FIFO P1
JP1 9
VREG
HEADER SW1
U13
EPROM
LED TB1
TB4 CLKIN J6
Windows is a registered trademark of Microsoft Corp. LabVIEW is a trademark of National Instruments.
REV. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 2002
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