Evaluation Board User Guide
UG-046
One
Technology Way
•
P.O. Box 9106
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Norwood, MA 02062-9106, U.S.A.
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Tel: 781.329.4700
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Fax: 781.461.3113
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www.analog.com
Evaluating the AD1974 Four ADC with PLL 192 kHz, 24-Bit Codec
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 32
EVAL-AD1974AZ PACKAGE CONTENTS
AD1974 evaluation board
USBi control interface board
USB cable
OTHER SUPPORTING DOCUMENTATION
AD1974
data sheet
EVALUATION BOARD OVERVIEW
This document explains the design and setup of the evaluation
board for the AD1974. The evaluation board must be connected
to an external ±12 V dc power supply and ground. On-board
regulators derive the 3.3 V supplies for the AD1974. The
AD1974 is controlled through an SPI interface. A small external
interface board, EVAL-ADUSB2EBZ (also called USBi),
connects to a PC USB port and provides SPI access to the
evaluation board through a ribbon cable. A graphical user
interface (GUI) program is provided for easy programming of
the chip in a Microsoft® Windows® PC environment. The
evaluation board allows demonstration and performance testing
of most AD1974 features, including the four ADCs, as well as
the digital audio ports.
Additional analog circuitry (ADC input filter/buffer) and
digital interfaces such as S/PDIF are provided to ease product
evaluation.
All analog audio interfaces are accessible with stereo audio
3.5 mm TRS connectors.
FUNCTIONAL BLOCK DIAGRAM
ADC 1&2
MCLK ROUTING
POWER SUPPLY
AD1974
SERIAL AUDIO
INTERFACES
S/PDIF
INTERFACE
CONTROL
INTERFACE
CLOCK & DATA ROUTING
LRCLK, BCLK, SDATA
SPI
ANALOG
AUDIO
08424-
001
Figure 1.
