EVAL-AD73322EB Datasheet, PDF (1/12 Pages) Analog Devices – EvaluationBoardforLowCost,LowPower, CMOSGerneralPurposeDualAnalogFrontEnd

a EvaluationBoardforLowCost,LowPower,
CMOS Gerneral Purpose Dual Analog Front End
EVAL-AD73322EB
FEATURES
INTRODUCTION
Up to 4 CODECS (2 Devices)Can Be Configured In
Cascade.
Interfaces To The ADSP-2181 EZ-KIT LITE.
Stand Alone Capabiliy.
Daughter Board for Quick Demo of CODECS
Various Link Options For Setting Configuration.
On Board +5V Regulator.
On Board Clock Generator.
On Board Anti-Aliasing.
EVAL-AD73322EZ / EVAL-AD73322EB
The AD73322 Evaluation board can be supplied either
with or without an ADSP2181 EZ-KIT LITE Board.
EVAL-AD73322EZ contains an AD73322 evaluation board
and a modified EZ-KIT LITE board. EVAL-AD73322EB
contains an AD73322 evaluation board and the material
needed to modify a customers existing EZ-KIT LITE
board.
An existing EZ-KIT LITE board can easily be modified to
interface with the EVAL-AD73322EB board by carrying out
the following modification:
- Solder the 40 pin right angle header (included in the EVAL-
AD73322EB package) onto the EZ-KIT LITE board in
position P3, pins 11-50, with the header pins facing the edge
of the board.
The AD73322 is a dual front-end processor for general
purpose applications including speech and telephony. It
features two 16-bit A/D conversion channel and two 16-bit D/
A conversion channel. Each channel provides 70 dB signal-
to-noise ratio over a voiceband signal bandwidth.
The AD73322 is suitable for a variety of applications in the
speech and telephony area including low bit rate, high quality
compression, speech enhancement, recognition and synthe-
sis. The low group delay characteristic of the part makes it
suitable for single or multichannel active control applications.
The gains of the A/D and D/A conversion channels are
programmable over 38dB and 21dB ranges respectively. An
on-chip reference voltage is included to allow single supply
operation. A serial port (SPORT) allows easy interfacing of
single or cascaded devices to industry standard DSP engines.
The AD73322 is available in both 28-lead SOIC and 44-lead
LQFP packages.
Full data on the AD73322 is available in the AD73322 data
sheet available from Analog Devices and should be consulted
in conjunction with this Technical Note when using the
Evaluation Board.
Included on the evaluation board, along with the two AD73322
Codecs are a power supply circuit, a clock generator circuit,
a cascade selector circuit and a daughter board. These are
explained in detail on the next page.
FUNCTIONAL BLOCK DIAGRAM
Stereo Inputs (4x)
Power Supply
EZ-KIT
Connector
Codec1
Codec2
External
Connector
Cascade
Select Circuit
Push-button
Switch. (S1)
Clock Generator
REV. A
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 which may result from its use. No license is granted by
implication or otherwise under any patent or patent rights of Analog
Devices.
© Analog Devices, Inc., 1998
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106,
U.S.A. Tel: [phone]
Fax: 617/326-
8703