Texas Instruments TAS5026REF User Manual

TAS5026REF

Reference Design for the TAS5026 Digital Audio
PWM Processor

User’s Guide

April 2003 Digital Audio/Application

SLEU035

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Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EV ALUA TION

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Copyright  2003, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the specified input and output ranges described in
the EVM User’s Guide.

Exceeding the specified input range may cause unexpected operation and/or irreversible
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field representative prior to connecting the input power.

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During normal operation, some circuit components may have case temperatures greater than
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as the input and output ranges are maintained. These components include but are not limited
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types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.

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Copyright  2003, Texas Instruments Incorporated

About This Manual

This manual describes the T AS5026REF reference design from T exas Instru­ments.

How to Use This Manual

Information About Cautions and Warnings

Preface

Read This First

This document contains the following chapters:

- Chapter 1 – Introduction

- Chapter 2 – System Interfaces

- Chapter 3 – Schematic, Parts List, PCB Specification, and PCB Layout

Information About Cautions and Warnings

This book may contain cautions and warnings.

This is an example of a caution statement.
A caution statement describes a situation that could potentially

damage your software or equipment.

This is an example of a warning statement.
A warning statement describes a situation that could potentially

cause harm to you

.

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

iii

Related Documentation From Texas Instruments

Related Documentation From Texas Instruments

The following is a list of data manual that have detailed descriptions of the
integrated circuits used in the design of the T AS5026REF evaluation module.
The data manuals can be obtained at the URL http://www.ti.com

Part Number Literature Number

TAS5026PFB
SN74LVC2G08DCTR
SN74LVC08APWR
SN74LVC126APWR
TPA112DGN

Trademarks

Equibit is a trademark of Texas Instruments.

.

SLES041
SCES198
SCAS283
SCAS339
SLOS212

iv

Contents

Contents

1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 TAS5026REF Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 PCB Key Map 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Jumper Settings 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 System Interfaces 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Digital Audio Interface (J160) 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Control Interface (J100) 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 PWM Interface (J140) 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Schematic, Parts List, PCB Specification, and PCB Layout 3-1. . . . . . . . . . . . . . . . . . . . . . . . .

Figures

1–1 TDAA System With TAS5026REF and TAS5110D6REF Reference Designs 1-2. . . . . . . . . .

1–2 Physical Structure for the TAS5026REF (Rough Outline) 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 Pin Numbers at PWM Interface (J140) 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

2–1 Digital Audio Interface Pin Connections 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Clock Rates 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Control Interface Pin Connections 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 J140 Pin Description 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

v

vi

Chapter 1

Introduction

The true digital audio amplifiers (TDAA) system consists of a PCM-PWM
modulator device and a PWM power output device. The PCM-PWM processor
accepts a serial PCM digital audio stream and converts it to a 3.3-V PWM
audio stream. The TDAA output stage provides a large-signal PWM output.
The digital PWM signal is then demodulated, providing power output for
driving loudspeakers. This patented technology provides low cost, high
quality, highly efficient digital audio applicable to many audio systems
developed for the digital age.

The TAS5026REF reference design demonstrates the integrated circuit
T AS5026 from Texas Instruments (TI). The TAS5026 is a 24-bit multichannel
digital pulse width modulator based on Equibit technology . The TAS5026 is
designed to drive up to six digital power devices to provide six channels of
digital audio amplification. The digital power devices can be conventional
monolithic power stages (such as the TAS5110 or the TAS5112) or discrete
differential power stages using gate drivers and MOSFETs.

Topic Page

1.1 T AS5026REF Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 PCB Key Map 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Jumper Settings 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

The T AS5026 has six independent volume controls with soft volume and mute.
The T AS5026 supports bridged output configurations. The device operates in
AD mode (2-level modulation scheme). This all-digital audio system contains
only two analog components in the signal chain – an LC low-pass filter at each
speaker terminal. The TAS5026 provides up to 96-dB SNR at the speaker
terminals. The TAS5026 has a wide variety of serial input options including
right justified (16, 20, or 24 bit), I2S (16, 20, or 24 bit), left justified, or DSP (16
bit) data formats. It is fully compatible with AES standard sampling rates of

44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz, including de-emphasis for 44.1-kHz
and 48-kHz sample rates. The T AS5026 plus the TAS51xx power stage device
combination can be used in a wide range of applications such as
microcomponent systems, home theater in a box (HTIB), DVD receivers, A/V
receivers, or TV sets.

Together with the TAS5110D6REF or the TAS5112D6REF module, the
T AS5026REF module is a complete true digital audio amplifier system, which
includes digital volume control, headphone amplifier, and a subwoofer output.

Figure 1–1.TDAA System With TAS5026REF and TAS5110D6REF Reference Designs

Digital
Audio

Interface

Control

Interface

I2S Bus

I2C Bus

Control Interface

1.1 TAS5026REF Features

- Six channel TDAA reference design (double-sided plated-through PCB

layout)

- Supports noiseless self-contained protection system (short circuit and

thermal) for the TAS5110 and the TAS5182 output stages. The
autorecovery loop is closed when JMP120 and JMP121 are shorted.

- Onboard headphone amplifier

TAS5026DREF

Module

PWM Interface

TAS5110D6REF

Module

1-2