Texas Instruments DEM-DSD1796 Manual de usuario

DEM-DSD1796/PCM1795/PCM1796/PCM1798

DSD1796/PCM1795/PCM1796/PCM1798 Evaluation Module

User's Guide

Literature Number: SLEU057ASeptember 2004 – Revised May 2009

2 SLEU057A – September 2004 – Revised May 2009Submit Documentation Feedback

Contents

Preface ............................................................................................................................... 5

1 Description ................................................................................................................ 71.1 Functional Block Diagram .................................................................................................. 81.2 EVM Features ................................................................................................................ 81.3 System Requirements ....................................................................................................... 91.4 Electrostatic Discharge Warning ........................................................................................... 91.5 Function Control for DAI Interface Format ............................................................................... 91.6 Reset Operation .............................................................................................................. 91.7 SW006 Operation Control for DAC ...................................................................................... 101.8 Jumper Connection ........................................................................................................ 101.9 Demonstration Software ................................................................................................... 10

2 Schematics, PCB Layout, and Bill of Materials ............................................................. 112.1 DEM-DAI/ASDAC Printed Circuit Board Layout ........................................................................ 122.2 DEM-AS/CDAC Printed Circuit Board Layout .......................................................................... 152.3 DEM-DAI/ASDAC Schematics ............................................................................................ 172.4 DEM-AS/CDAC Schematics .............................................................................................. 192.5 Component Lists ........................................................................................................... 202.5.1 DEM-AS/CDAC_96/98 Parts List................................................................................ 202.5.2 DEM-DAI/ASDAC_96/98 Parts List ............................................................................. 20

Revision History ................................................................................................................. 22

Important Notices ............................................................................................................... 23

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List of Figures

1-1 DEM-DSD1796/PCM1795/PCM1796/PCM1798 Block Diagram ...................................................... 82-1 DEM-DAI/ASDAC Silkscreen ............................................................................................. 122-2 DEM-DAI/ASDAC (Top View) ............................................................................................ 132-3 DEM-DAI/ASDAC (Bottom View)......................................................................................... 142-4 DEM-AS/CDAC Silkscreen ................................................................................................ 152-5 DEM-AS/CDAC (Top View) ............................................................................................... 152-6 DEM-AS/CDAC (Bottom View) ........................................................................................... 162-7 DEM-DAI/ASDAC Analog Section (Sockets for Daughterboard and Low-Pass Filter) ............................ 172-8 DEM-DAI/ASDAC Connector and Regulator ........................................................................... 172-9 DEM-DAI/ASDAC Digital Section (Digital Audio Interface) ........................................................... 182-10 DEM-AS/CDAC ............................................................................................................. 19

List of Tables

1-1 Digital Audio Receiver Configuration ...................................................................................... 91-2 SW006 Options ............................................................................................................. 102-1 Bill of Materials ............................................................................................................. 202-2 Bill of Materials ............................................................................................................. 20

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PrefaceSLEU057A – September 2004 – Revised May 2009

Read This First

About This Manual

This document provides the information needed to set up and operate theDEM-DSD1796/PCM1795/PCM1796/PCM1798 EVM evaluation module, a test platform for the 24-bit,192-kHz, sampling stereo DSD1796 ,PCM1795 ,PCM1796 , and PCM1798 audio digital-to-analogconverters (DACs). For a more detailed description of these devices, refer to the specific device productdata sheet available from the Texas Instruments web site at http://www.ti.com .

How to Use This ManualThroughout this document, the abbreviation EVM and the term evaluation module are synonymous withthe DEM-DSD1796/PCM1795/PCM1796/PCM1798 EVM. Unless specifically noted, the informationpresented in this manual applies to the DSD1796, PCM1795, PCM1796, and PCM1798 audio stereoDACs.

Chapter 1 describes the hardware setup guide for the EVM, including the necessary information requiredto configure the EVM switches and jumpers for product evaluation. This chapter also explains how to usethe software provided with the DEM-DSD1796/PCM1795/PCM1796/PCM1798 EVM for controlling theDAC.

Chapter 2 includes the EVM electrical schematics, printed circuit board (PCB) layouts, and the bills ofmaterial for both the DEM-DSD1796/PCM1795/PCM1796/PCM1798, the DEM-AS/CDAC, and theDEM-DAI/ASDAC.

Information About Cautions and WarningsThis document contains caution statements.

CAUTION

This is an example of a caution statement. A caution statement describes asituation that could potentially damage your software or equipment.

The information in a caution or a warning is provided for your protection. Please read each caution andwarning carefully.

If You Need Assistance

If you have questions regarding either the use of this evaluation module or the information contained in theaccompanying documentation, please contact the Texas Instruments Product Information Center at (972)644–5580 or visit the TI web site at www.ti.com .

FCC Warning

This equipment is intended for use in a laboratory test environment only. It generates, uses, and canradiate radio frequency energy and has not been tested for compliance with the limits of computingdevices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonableprotection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense is required totake whatever measures may be required to correct this interference.

Microsoft, Windows are registered trademarks of Microsoft Corporation.I

S is a trademark of NXP Semiconductors.TOSLINK is a trademark of Toshiba Corporation.All other trademarks are the property of their respective owners.

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Trademarks

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Trademarks

All trademarks are the property of their respective owners.

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Chapter 1SLEU057A – September 2004 – Revised May 2009

Description

The DEM-DSD1796/PCM1795/PCM1796/PCM1798 is an evaluation fixture for the DSD1796/PCM1795/PCM1796/PCM1798 series of 24-bit, 192-kHz sampling stereo DACs. This EVM provides all necessaryconnectors and circuitry for interfacing to audio test systems and commercial audio equipment.

Topic .................................................................................................. Page

1.1 Functional Block Diagram ............................................................ 81.2 EVM Features ............................................................................. 81.3 System Requirements ................................................................. 91.4 Electrostatic Discharge Warning .................................................. 91.5 Function Control for DAI Interface Format ..................................... 91.6 Reset Operation.......................................................................... 91.7 SW006 Operation Control for DAC .............................................. 101.8 Jumper Connection ................................................................... 101.9 Demonstration Software ............................................................ 10

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1.1 Functional Block Diagram

CN003

Serial

Connector

I/V

5534a

I/V

5534a

I/V

5534a

I/V

5534a

BAL Amp

5534a

BAL Amp

5534a

LchOUT

(4.5 V )

RMS

RchOUT

(4.5 V )

RMS

DAI

CS8414

SW001 003

Mode Control

S/PDIF IN

OPT

Coax

DSDS1796

PCM1795

PCM1796

PCM1798

DEM-AS/CDAC Daughter Card

3.3-V

Regulator

+VCC

(5 V)

AVCC

( 15 V)

1.2 EVM Features

Functional Block Diagram

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Figure 1-1 illustrates the functional block diagram of the DEM-DSD1796/PCM1795/PCM1796/PCM1798EVM.

Figure 1-1. DEM-DSD1796/PCM1795/PCM1796/PCM1798 Block Diagram

The DEM-DSD1796/PCM1795/PCM1796/PCM1798 series of stereo DACs consist of a DAI (S/PDIF)section that uses a DSD1796/PCM1795/PCM1796/PCM1798 DAC section, a differential current/voltage(I/V) section, and a balanced amplifier with a post-low-pass filter (LPF) section.

The DEM-DSD1796/PCM1795/PCM1796/PCM1798 requires a 5-V digital power supply for its digitalcircuits, a 5-V analog power supply for the device itself, and a ±15-V analog power supply for thebalanced amplifier circuits.

The DAI section has both coaxial and optical inputs that are switch-selectable and capable of handlingsampling rates up to 96 kHz.

The DSD1796/PCM1795/PCM1796/PCM1798 accepts PCM audio data input at a sampling rate up to 192kHz, or a 64-f

DSD signal input, as determined by functional control settings and jumper connections onthe board.

This evaluation fixture uses the DEM-DSD1796/PCM1795/PCM1796/PCM1798 demonstration board anddemonstration software for functional evaluation and operational control of theDSD1796/PCM1795/PCM1796/PCM1798 DAC device.

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1.3 System Requirements

1.4 Electrostatic Discharge Warning

1.5 Function Control for DAI Interface Format

1.6 Reset Operation

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System Requirements

The DEM-DSD1796/PCM1795/PCM1796/PCM1798 EVM has the following requirements:• ± 15-V analog power supply at AVCC+, AVCC–, and GND•5-V DAC power supply at VCC and GND•S/PDIF input (sampling rate f

is up to 96 kHz) connected at the coaxial or optical connector•RCA analog output connected at CN103 (Lch) and CN104 (Rch); analog full-scale output level is 4.5V

RMS

.•PC connected to printer connector CN003 for demonstration software operation (if necessary)•Appropriate test module:– DEM-PCM1795: for PCM1795– DEM-PCM1796: for PCM1796– DEM-DSD1796: for DSD1796– DEM-PCM1798: for PCM1798

Many of the components on the DEM-DSD1796/PCM1795/PCM1796/PCM1798 EVM are susceptible todamage by electrostatic discharge (ESD). Customers are advised to observe proper ESD handlingprecautions when unpacking and handling the EVM, including the use of a grounded wrist strap at anapproved ESD workstation.

CAUTION

Failure to observe ESD handling procedures may result in damage to EVMcomponents.

SW001, SW002, and SW003 are switches for controlling the audio interface format of the DAI receiverCS8414. The default audio interface format of the DSD1796/PCM1795/PCM1796/PCM1798 is I

S™format. Table 1-1 lists the digital audio receiver configuration parameters.

Table 1-1. Digital Audio Receiver Configuration

Receiver Output DataSW001 SW002 SW003 Format

L L L 16- to 24-bit left–justifiedL H L 16- to 24-bit l2S16-bit right-justified (orH L H

standard)

18-bit right-justified (orL H H

standard)

Pressing the SW004 pushbutton initiates a reset operation of the CS8414.

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1.7 SW006 Operation Control for DAC

1.8 Jumper Connection

1.9 Demonstration Software

SW006 Operation Control for DAC

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Switch SW006 is the register set and reset control for the PCM1796 and DSD1796. The RESET section ofthe switch must be set to Hexcept to perform a reset operation. Table 1-2 shows the options for SW006.

Table 1-2. SW006 Options

SW006 RESET Function

H Normal operation (default)L Reset operation

JP001 selects the normal or inverted BCK signal for 24-bit left-justified or other formats (I

S); the defaultposition is I

Demonstration software is provided to control the PCM1796/DSD1796 internal register using a PC that isrunning the Microsoft

Windows

operating system. This software uses a printer cable to connect the PCto the DEM-PCM/DSD1796 connector CN003.

The demonstration software includes a total of five files in the DEM1796 directory of the supplied CD.These files are:•DEM1796.exe

•DEM1796.ini

•Vbrjp200.dll

•Ver.dll

•Inpout.dll

To load the software, first copy these files to a convenient directory (folder), such as:C:\DEM1796

Then, change the printer-port address in the DEM1796.ini initialization file to:& H378, & H278, or & H3BCO

Most PCs use & H378 as the default printer-port address.

10 Description SLEU057A – September 2004 – Revised May 2009Submit Documentation Feedback

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