Texas Instruments DEM-PCM2912 EVM Manual de usuario

DEM-PCM2912 EVM

User's Guide

March 2008 AIP Consumer Audio—TI Japan

SBAU132

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Contents

Preface ............................................................................................................................... 7

1 Description ................................................................................................................ 91.1 Introduction—PCM2912 ......................................................................................... 101.1.1 Key Features .............................................................................................. 101.2 Pin Assignments and Terminal Functions...................................................................... 111.3 Functional Block Diagram ........................................................................................ 13

2 Getting Started ......................................................................................................... 152.1 Electrostatic Discharge Warning ................................................................................ 162.2 Block Diagram ..................................................................................................... 162.3 Interface and Connections ....................................................................................... 16

3 Set-Up Guide ........................................................................................................... 173.1 Basic Operating Set-Up—Windows Vista ...................................................................... 183.1.1 Basic Setup Before Evaluation ......................................................................... 183.1.2 Volume and Mute Settings .............................................................................. 193.1.3 Sampling Frequency ..................................................................................... 213.2 Basic Operating Set-Up—Windows XP ........................................................................ 233.2.1 Basic Setup Before Evaluation ......................................................................... 233.2.2 Volume Settings .......................................................................................... 243.3 Basic Operating Set-Up—Mac OS .............................................................................. 273.3.1 Basic Setup Before Evaluation ......................................................................... 273.3.2 Volume Settings .......................................................................................... 293.3.3 Sampling Frequency ..................................................................................... 30

4 Evaluation and Measurements ................................................................................... 334.1 Measurements for Dynamic Characteristics ................................................................... 344.2 Playback Performance ............................................................................................ 344.3 Recording Performance .......................................................................................... 36

5 Schematic, PCB Layout, and Bill of Materials ............................................................... 375.1 Schematics ......................................................................................................... 385.2 Printed Circuit Board Layout ..................................................................................... 395.3 Component List .................................................................................................... 40

Important Notices ............................................................................................................... 42

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List of Figures
1-1 PCM2912 Pin Assignments ............................................................................................... 111-2 DEM-PCM2912 EVM Functional Block Diagram ....................................................................... 132-1 DEM-PCM2912 EVM Block Diagram .................................................................................... 163-1 Sound—Playback Tab (Windows Vista)................................................................................. 183-2 Sound—Recording Tab (Windows Vista) ............................................................................... 183-3 Speakers Properties—Levels Tab (Windows Vista) ................................................................... 193-4 Microphone Properties—Levels Tab (Windows Vista) ................................................................ 203-5 Speakers Properties—Advanced Tab (Windows Vista) ............................................................... 213-6 Microphone Properties—Advanced Tab (Windows Vista) ............................................................ 223-7 Sound and Audio Devices Properties—Audio Tab (Windows XP) .................................................. 233-8 Sound and Audio Devices Properties—Volume Tab (Windows XP) ................................................ 243-9 Speaker Window for Volume Setting (Windows XP) .................................................................. 253-10 Sound and Audio Devices Properties—Audio Tab (Windows XP) .................................................. 253-11 Microphone Volume Windows for Record Volume Setting (Windows XP) ......................................... 263-12 Sound—Input Tab (Mac OS) ............................................................................................. 273-13 Sound—Output Tab (Mac OS) ........................................................................................... 283-14 Audio Midi Setting Window (Mac OS) ................................................................................... 293-15 QuickTime Audio Recording Controls ................................................................................... 303-16 Audio Midi Setting Window (Mac OS) ................................................................................... 314-1 DEM-PCM2912 EVM Configuration for Playback Performance Measurement .................................... 344-2 DEM-PCM2912 EVM Configuration for Recording Performance Measurement when Recording Data ........ 364-3 DEM-PCM2912 EVM Configuration for Recording Performance Measurement with Recorded Data .......... 365-1 DEM-PCM2912 EVM Schematic ......................................................................................... 385-2 DEM-PCM2912 EVM Board Layout—Silkscreen ...................................................................... 395-3 DEM-PCM2912 EVM Board Layout—Component Side .............................................................. 395-4 DEM-PCM2912 EVM Board Layout—Inner View ...................................................................... 39
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List of Tables

1-1 PCM2912 Terminal Functions ............................................................................................ 112-1 DEM-PCM2912 EVM Connectors ........................................................................................ 164-1 Line Output Playback Performance ...................................................................................... 354-2 32- ΩHeadphone Output Playback Performance ...................................................................... 354-3 16- ΩHeadphone Output Playback Performance ...................................................................... 354-4 Line Input Recording Performance....................................................................................... 365-1 Bill of Materials ............................................................................................................. 40

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List of Tables6 SBAU132 – March 2008Submit Documentation Feedback

PrefaceSBAU132 – March 2008

Read This First

About This Manual

This document provides the information needed to set up and operate the DEM-PCM2912 EVM evaluationmodule, a test platform for the 16-bit, mono microphone input and stereo headphone output, single-chipPCM2912 stereo audio coder/decoder (codec) with a universal serial bus (USB) interface. For a moredetailed description of the PCM2912 product line, refer to the product data sheet available from the TexasInstruments web site at http://www.ti.com . Support documents are listed in the section of this guideentitled Related Documentation from Texas Instruments .

How to Use This ManualThroughout this document, the abbreviation EVM and the term evaluation module are synonymous withthe DEM-PCM2912 EVM.

Chapter 1 gives an overview of the PCM2912 USB interface codec. The EVM block diagram and primaryfeatures are also discussed.

Chapter 2 provides general information regarding EVM handling and unpacking, absolute operatingconditions, and the default switch and jumper configuration.

Chapter 3 is the hardware and software setup guide for the EVM, providing all of the necessaryinformation needed to configure the EVM under various PC operating systems for product evaluation.

Chapter 4 discusses how to configure the DEM-PCM2912 EVM motherboard for performance evaluationusing an audio analyzer.

Chapter 5 includes the EVM electrical schematic, printed circuit board (PCB) layout, and the bill ofmaterials.

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.

Macintosh, QuickTime are registered trademarks of Apple Incorporated.SYS-2722 is a registered trademark of Audio Precision, Inc.Windows Vista, Windows XP are registered trademarks of Microsoft Corporation.All other trademarks are the property of their respective owners.

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www.ti.com

Related Documentation From Texas Instruments

Related Documentation From Texas InstrumentsThe following documents provide information regarding Texas Instruments integrated circuits used in theassembly of the DEM-PCM2912 EVM. These documents are available from the TI web site . The lastcharacter of the literature number corresponds to the document revision that is current at the time of thewriting of this User’s Guide. Newer revisions may be available from the TI web site at http://www.ti.com/ orcall the Texas Instruments Literature Response Center at (800) 477–8924 or the Product InformationCenter at (972) 644–5580. When ordering, identify the document(s) by both title and literature number.Data Sheet Literature Number

PCM2912 Product data sheet SLES216

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.

Trademarks

All trademarks are the property of their respective owners.

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Chapter 1SBAU132 – March 2008

Description

The DEM-PCM2912 EVM is a complete evaluation platform for the 16-bit, mono microphone input andstereo headphone output PCM2912 bus-powered audio codec with a USB interface. All necessaryconnectors and circuitry are provided for interfacing to audio test systems and commercial audioequipment.

A USB connector is mounted on the DEM-PCM2912 EVM. Stereo audio output and mono audio input areavailable on two stereo mini-jacks.

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

1.1 Introduction—PCM2912 ............................................................ 101.2 Pin Assignments and Terminal Functions .................................... 111.3 Functional Block Diagram .......................................................... 13

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1.1 Introduction—PCM2912

1.1.1 Key Features

Introduction—PCM2912

The PCM2912 is an audio codec with a USB interface for a USB headset, USB headphones, and a USBaudio interface box that integrates mono input, stereo headphone output, an analog loopback line, aprogrammable gain amplifier (PGA), and microphone bias.

It is available in a 32-pin TQFP package.

Major features of the PCM2912 include:•Analog Front End:– Microphone amplifier (+20 dB gain)– Mono input•Analog Back End:– Stereo/Mono headphone amplifier or line output with volume•Analog Performance:

– Dynamic range: 90 dB (DAC)– Dynamic range: 90 dB (ADC)– 25-mW headphone output at R

= 16 Ω•Power-Supply Voltage– Single power supply of 5.0 V (V

BUS

)•Low Power Dissipation:– 425 mW at analog-to-digital converter (ADC) and digital-to-analog converter (DAC) operation, 44.1kHz

– 0.8 mW in Suspend mode•Sampling Frequency: 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz, 48 kHz for ADC andDAC

•Programmable Function:– –76-dB to 0-dB gain for analog outputs– –12-dB to +30-dB gain for analog inputs– –76-dB to 0-dB gain for sidetone– 0-dB/20-dB gain for microphone amplifier– High-pass filter: 0.078 ×f

cutoff frequency•Package: 32-pin TQFP•Operating Temperature Range: –25 °C to +85 °C

Description 10 SBAU132 – March 2008Submit Documentation Feedback

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