ANALOG DEVICES UG-048 Service Manual

Evaluation Board User Guide

DAC LEFT DIFFENTIAL OUT

DAC L&R SINGLE ENDED OUT

DAC RIGHT DI FFERENTIAL OUT

POWER SUPPLY

AD1955

SERIAL AUDI O

INTERFACES

S/PDIF

INTERFACE

CONTROL

INTERFACE

CLOCK AND DATA RO UTING

08434-001

UG-048

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

Evaluating the AD1955 High Performance, Multibit Sigma-Delta DAC with

SACD Playback

EVAL-AD1955EBZ PACKAGE CONTENTS

AD1955 evaluation board
USBi control interface board
USB cable

OTHER SUPPORTING DOCU M ENTAT IO N

AD1955 data sheet

EVALUATION BOARD OVERVIEW

This document explains the design and setup of the evaluation
board for the AD1955. The evaluation board must be connected
to an external ±12 V dc power supply and ground. On-board
regulators derive 5 V and 3.3 V supplies for the AD1955 and
peripherals. The AD1955 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 AD1955 features, including high
performance stereo DAC operation.

Additional analog circuitry (DAC I/V converter/filter/buffer)
and digital interfaces such as S/PDIF are provided to ease
product evaluation.

The board has an S/PDIF receiver with XLR, RCA, and optical
connectors, as well as a discrete serial audio interface. Analog
interfaces are accessible with XLR or RCA connectors.

FUNCTIONAL BLOCK DIAGRAM

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

Figure 1.

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