ANALOG DEVICES UG-046 Service Manual

Evaluation Board User Guide

ADC 1&2

MCLK ROUTING

POWER SUPPLY

AD1974

SERIAL AUDI O
INTERFACES

S/PDIF
INTERFACE

CONTROL
INTERFACE

CLOCK & DATA RO UTING

LRCLK, BCL K, SDATA

SPI

ANALOG
AUDIO

08424-001

UG-046

One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: [phone] • Fax: [phone] • www.anal og.com

Evaluating the AD1974 Four ADC with PLL 192 kHz, 24-Bit Codec

EVAL-AD1974AZ PACKAGE CONTENTS

AD1974 evaluation board
USBi control interface board
USB cable

OTHER SUPPORTING DOCU MENTATION

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

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 32

Figure 1.