Texas Instruments Evaluation Module PCM1798 User Manual

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DEM-DSD1796/PCM1795/PCM1796/PCM1798

DSD1796/PCM1795/PCM1796/PCM1798 Evaluation Module

User's Guide

Literature Number: SLEU057A

September 2004–RevisedMay 2009

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Contents

Preface ...............................................................................................................................

 

5

1

Description ................................................................................................................

7

1.1

Functional Block Diagram ..................................................................................................

8

1.2

EVM Features ................................................................................................................

8

1.3

System Requirements.......................................................................................................

9

1.4

Electrostatic Discharge Warning...........................................................................................

9

1.5

Function Control for DAI Interface Format ...............................................................................

9

1.6

Reset Operation..............................................................................................................

9

1.7

SW006 Operation Control for DAC ......................................................................................

10

1.8

Jumper Connection ........................................................................................................

10

1.9

Demonstration Software...................................................................................................

10

2

Schematics, PCB Layout, and Bill of Materials .............................................................

11

2.1

DEM-DAI/ASDAC Printed Circuit Board Layout........................................................................

12

2.2

DEM-AS/CDAC Printed Circuit Board Layout ..........................................................................

15

2.3

DEM-DAI/ASDAC Schematics............................................................................................

17

2.4

DEM-AS/CDAC Schematics ..............................................................................................

19

2.5

Component Lists ...........................................................................................................

20

 

2.5.1

DEM-AS/CDAC_96/98 Parts List................................................................................

20

 

2.5.2

DEM-DAI/ASDAC_96/98 Parts List .............................................................................

20

Revision History.................................................................................................................

22

Important Notices...............................................................................................................

23

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Contents

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List of Figures

 

1-1

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

8

2-1

DEM-DAI/ASDAC Silkscreen .............................................................................................

12

2-2

DEM-DAI/ASDAC (Top View) ............................................................................................

13

2-3

DEM-DAI/ASDAC (Bottom View).........................................................................................

14

2-4

DEM-AS/CDAC Silkscreen................................................................................................

15

2-5

DEM-AS/CDAC (Top View) ...............................................................................................

15

2-6

DEM-AS/CDAC (Bottom View) ...........................................................................................

16

2-7

DEM-DAI/ASDACAnalog Section (Sockets for Daughterboard andLow-PassFilter)............................

17

2-8

DEM-DAI/ASDAC Connector and Regulator ...........................................................................

17

2-9

DEM-DAI/ASDAC Digital Section (Digital Audio Interface) ...........................................................

18

2-10

DEM-AS/CDAC .............................................................................................................

19

 

List of Tables

 

1-1

Digital Audio Receiver Configuration......................................................................................

9

1-2

SW006 Options.............................................................................................................

10

2-1

Bill of Materials .............................................................................................................

20

2-2

Bill of Materials .............................................................................................................

20

4

List of Figures

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Preface

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About This Manual

This document provides the information needed to set up and operate the DEM-DSD1796/PCM1795/PCM1796/PCM1798EVM evaluation module, a test platform for the24-bit,192-kHz,sampling stereoDSD1796,PCM1795,PCM1796, andPCM1798 audiodigital-to-analogconverters (DACs). For a more detailed description of these devices, refer to the specific device product data sheet available from the Texas Instruments web site athttp://www.ti.com.

How to Use This Manual

Throughout this document, the abbreviation EVM and the termevaluation module are synonymous with theDEM-DSD1796/PCM1795/PCM1796/PCM1798EVM. Unless specifically noted, the information presented in this manual applies to the DSD1796, PCM1795, PCM1796, and PCM1798 audio stereo DACs.

Chapter 1 describes the hardware setup guide for the EVM, including the necessary information required to configure the EVM switches and jumpers for product evaluation. This chapter also explains how to use the software provided with theDEM-DSD1796/PCM1795/PCM1796/PCM1798EVM for controlling the DAC.

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

Information About Cautions and Warnings

This document contains caution statements.

CAUTION

This is an example of a caution statement. A caution statement describes a situation 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 and warning carefully.

If You Need Assistance

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

FCC Warning

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

Microsoft, Windows are registered trademarks of Microsoft Corporation.

I2S 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 1

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Description

The DEM-DSD1796/PCM1795/PCM1796/PCM1798is an evaluation fixture for the DSD1796/PCM1795/ PCM1796/PCM1798 series of24-bit,192-kHzsampling stereo DACs. This EVM provides all necessary connectors and circuitry for interfacing to audio test systems and commercial audio equipment.

Topic

 

Page

1.1

Functional Block Diagram............................................................

8

1.2

EVM Features.............................................................................

8

1.3

System Requirements .................................................................

9

1.4

Electrostatic Discharge Warning ..................................................

9

1.5

Function Control for DAI Interface Format .....................................

9

1.6

Reset Operation..........................................................................

9

1.7

SW006 Operation Control for DAC ..............................................

10

1.8

Jumper Connection...................................................................

10

1.9

Demonstration Software ............................................................

10

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Functional Block Diagram

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1.1Functional Block Diagram

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

 

 

I/V

 

 

 

CN003

5534a

 

 

 

Serial

 

BAL Amp

LchOUT

 

Connector

 

 

 

5534a

(4.5 VRMS)

 

 

 

 

 

I/V

 

 

 

 

5534a

 

 

S/PDIF IN

 

DSDS1796

 

 

DAI

PCM1795

 

 

OPT

 

 

CS8414

PCM1796

 

 

Coax

 

 

 

PCM1798

 

 

 

 

 

 

 

 

I/V

 

 

 

 

5534a

 

 

 

 

 

BAL Amp

RchOUT

 

SW001−003

 

5534a

(4.5 VRMS)

 

 

 

 

 

Mode Control

I/V

 

 

 

 

 

 

 

 

5534a

 

 

 

 

DEM-AS/CDACDaughter Card

 

 

 

 

3.3-V

 

 

 

 

Regulator

 

 

 

 

+VCC

±AVCC

 

 

 

(5 V)

(±15 V)

 

 

Figure 1-1.DEM-DSD1796/PCM1795/PCM1796/PCM1798Block Diagram

 

1.2EVM Features

The DEM-DSD1796/PCM1795/PCM1796/PCM1798series 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 apost-low-passfilter (LPF) section.

The DEM-DSD1796/PCM1795/PCM1796/PCM1798requires a5-Vdigital power supply for its digital circuits, a5-Vanalog power supply for the device itself, and a±15-Vanalog power supply for the balanced amplifier circuits.

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

The DSD1796/PCM1795/PCM1796/PCM1798 accepts PCM audio data input at a sampling rate up to 192

kHz, or a 64-fS DSD signal input, as determined by functional control settings and jumper connections on the board.

This evaluation fixture uses the DEM-DSD1796/PCM1795/PCM1796/PCM1798demonstration board and demonstration software for functional evaluation and operational control of the DSD1796/PCM1795/PCM1796/PCM1798 DAC device.

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System Requirements

1.3System Requirements

The DEM-DSD1796/PCM1795/PCM1796/PCM1798EVM has the following requirements:

±15-Vanalog power supply at AVCC+,AVCC–,and GND

5-VDAC power supply at VCC and GND

S/PDIF input (sampling rate fS is up to 96 kHz) connected at the coaxial or optical connector

RCA analog output connected at CN103 (Lch) and CN104 (Rch); analog full-scaleoutput level is 4.5

VRMS.

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

1.4Electrostatic Discharge Warning

Many of the components on the DEM-DSD1796/PCM1795/PCM1796/PCM1798EVM are susceptible to damage by electrostatic discharge (ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling the EVM, including the use of a grounded wrist strap at an approved ESD workstation.

CAUTION

Failure to observe ESD handling procedures may result in damage to EVM components.

1.5Function Control for DAI Interface Format

SW001, SW002, and SW003 are switches for controlling the audio interface format of the DAI receiver CS8414. The default audio interface format of the DSD1796/PCM1795/PCM1796/PCM1798 is I2S™ format.Table 1-1 lists the digital audio receiver configuration parameters.

Table 1-1.Digital Audio Receiver Configuration

 

 

 

Receiver Output Data

SW001

SW002

SW003

Format

L

L

L

16to 24-bitleft–justified

L

H

L

16to 24-bitl2S

H

L

H

16-bitright-justified(or

standard)

 

 

 

L

H

H

18-bitright-justified(or

standard)

 

 

 

1.6Reset Operation

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

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SW006 Operation Control for DAC

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1.7SW006 Operation Control for DAC

Switch SW006 is the register set and reset control for the PCM1796 and DSD1796. The RESET section of the switch must be set to H except 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

1.8Jumper Connection

JP001 selects the normal or inverted BCK signal for 24-bitleft-justifiedor other formats (I2S); the default position is I2S.

1.9Demonstration Software

Demonstration software is provided to control the PCM1796/DSD1796 internal register using a PC that is running the Microsoft® Windows® operating system. This software uses a printer cable to connect the PC to theDEM-PCM/DSD1796connector 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-portaddress in theDEM1796.ini initialization file to:

&H378, &H278, or &H3BCO

Most PCs use &H378 as the defaultprinter-portaddress.

10

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