Texas Instruments TA5704EVM Manuel utilisateur

TA5704EVM 4-Channel Digital Audio PowerAmplifier with Hardware Control

User's Guide

Literature Number: SLOU224April 2008

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Contents

Preface ........................................................................................................................................ 51 Overview ............................................................................................................................. 71.1 TAS5704EVM Features .................................................................................................. 81.2 Basic Tools for Initial Board Power up ................................................................................. 92 System Interfaces ................................................................................................................ 92.1 PSU Interface .............................................................................................................. 92.2 PSC Connector .......................................................................................................... 102.3 Loudspeaker and Subwoofer Connectors (2-Channel BTL Configuration) ...................................... 102.4 Digital Audio Interface SPDIF (J1/OPTO) ............................................................................ 102.5 ADC Interface ............................................................................................................ 112.6 Board Power up General Guidelines .................................................................................. 113 Jumpers and Control Utilities .............................................................................................. 113.1 Clock Frequency Change Jumper ..................................................................................... 113.2 SPDIF/PSIA Utilization Jumpers ....................................................................................... 113.3 Data Routing Jumpers .................................................................................................. 113.4 GAIN Jumpers ........................................................................................................... 123.5 Data Format Jumpers ................................................................................................... 123.6 CONFIG Jumpers ....................................................................................................... 123.7 Switches .................................................................................................................. 134 Board Layout, Bill of Material, and Schematics ...................................................................... 144.1 TAS5704EVM Board Layout, Top Composite View ................................................................ 144.2 TAS5704EVM Board Layout, Top Layer View ....................................................................... 154.3 TAS5704EVM Board Layout, Bottom Layer View ................................................................... 164.4 Bill of Materials ........................................................................................................... 174.5 Schematic ................................................................................................................ 19

Important Notices ............................................................................................................... 20

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List of Figures

1 2-Channel (BTL) Configuration with External Subwoofer EVM (TAS5601EVM2) .................................. 72 2-Channel (SE) + 1-Channel (BTL) Configuration ...................................................................... 83 4-Channel (SE) Configuration .............................................................................................. 84 Top Composite View of TAS5704EVM ................................................................................... 95 Top Layer Composite ...................................................................................................... 146 Top Layer .................................................................................................................... 157 Bottom Layer ................................................................................................................ 16

List of Tables

1 Recommended Power Supplies .......................................................................................... 102 TAS5704 SDINx Data Source ............................................................................................ 113 TAS5704 Gain Configuration ............................................................................................. 124 TAS5704 Data Format ..................................................................................................... 125 DIR9001 SPDIF Output Data Format .................................................................................... 126 TAS5704 Output Configuration ........................................................................................... 137 Bill of Materials for TAS5704EVM ....................................................................................... 17

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Preface

SLOU224 – April 2008

Read This First

About This Manual

This manual describes the operation of the TAS5704EVM evaluation module from Texas Instruments.

How to Use this ManualThis document contains the following chapters•Chapter 1 – Overview•Chapter 2 – System Interfaces•Chapter 3 – Jumpers and Control Utilities on TAS5704•Chapter 4 – TAS5704EVM Layout

Information About Cautions and WarningsThis manual may contain cautions and warnings.

CAUTION

This is an example of a caution statement.

A caution statement describes a situation that could potentially damage yoursoftware or equipment.

WARNINGThis is an example of a warning statement.

A warning statement describes a situation that could potentiallycause harm to you

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

Related Documentation from Texas InstrumentsThe following table contains a list of data manuals that have detailed descriptions of the integrated circuitsused in the design of the TAS5704EVM. The data manuals can be obtained at the URL http://www.ti.com .Part Number Literature Number

TAS5704 Data Sheet SLOS563DIR9001PW SLES198PCM1808PW SLES177 ATPS76733QD SLVS2081TAS5601 SLAS585

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Additional Documentation

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Additional Documentation

•General Application Notes

EVM Warnings / Restrictions and FCC WarningSee the Evaluation Board/Kit Warnings and Restrictions page towards the end of this User's Guide.

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1 Overview

SPDIF/

Optical, Coax

2CH Analog Input

from Other Source/

Digital Out

TAS5704

TAS5601EVM2

Subwofer

PWM out

Left

Right

I2S

User's GuideSLOU224 – April 2008

TA5704EVM 4-Channel Digital Audio Power Amplifier withHardware Control

TAS5704 customer evaluation module (EVM) demonstrates the integrated circuit (IC) TAS5704 fromTexas Instruments (TI).

TAS5704 is a 4-channel device with an I2S/RJ/LJ digital audio stream input and amplified PWM signalout. The subwoofer PWM signal is provided to an external class D power stage (TAS5601), which uses aLC demodulation filter to drive a subwoofer. For detail information about the TAS5704 device review thedevice data sheet, document number SLOS563 .

TAS5704 is designed to drive two 8- Ωloudspeakers up to 20W per channel (10%THD+N) in a BTLconfiguration. The TAS5704EVM can also be configured to drive four, 4- Ωspeakers in a single-ended(SE) configuration. Finally, the TAS5704EVM can be configured to drive 2 single-ended speakers plus 1bridge-tied speaker (2.1 mode). Review the board schematic, and TAS5601 documents for additionalinformation and more specific application information on the subwoofer daughter card and connector.

TAS5704EVM, together with other TI components on this board, is a complete 4 channel digital audioamplifier system, which includes digital input (SPDIF), analog inputs via ADC, and other features likemute, power down, output configuration control, format control, and gain control.

Figure 1. 2-Channel (BTL) Configuration with External Subwoofer EVM (TAS5601EVM2)

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SPDIF/

Optical, Coax

2CH Analog Input

from Other Source/

Digital Out

TAS5704

Left

Right

I2S

Sub

LC +

Cap

LC +

Cap

SPDIF/

Optical, Coax

2CH Analog Input

from Other Source/

Digital Out

TAS5704

LFront

RFront

I2S

LC +

Cap

LC +

Cap

LRear

RRear

LC +

Cap

LC +

Cap

1.1 TAS5704EVM Features

Overview

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Figure 2. 2-Channel (SE) + 1-Channel (BTL) Configuration

Figure 3. 4-Channel (SE) Configuration

•Self-contained protection systems and control pins•Standard I

S data input using optical or RCA inputs•Analog input through analog to digital converter•Subwoofer connection. PWM terminal to provide signal and power to an external subwoofer board(TAS5601EVM2)

•Double-sided plated-through PCB layout, 2oz copper, 2mm.•Access to control signal gain, output configuration, and data format on the EVM board using jumpers

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1.2 Basic Tools for Initial Board Power up

2 System Interfaces

2.1 PSU Interface

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System Interfaces

Figure 4. Top Composite View of TAS5704EVM

•Up to 26V, 3A power supply (PVCC)•5V, 500mA power supply (VIN)•Banana cables for power supplies and speakers•Optical or coaxial cable for SPDIF interface based on signal source•Two 8 Ωspeakers (BTL) or 4 Ωspeakers (SE). Resistive loads can also be used•Optional: TAS5601EVM2 (for subwoofer connection when using BTL configuration)

This chapter describes the TAS5704EVM board in regards to power supply (PSU) and system interfaces.

The TAS5704EVM module is powered using two power supply sources a 10–26V (PVCC) power supplyand a 5V (VIN) power supply. The 3.3V voltage levels are generated on the board using voltage regulatorsfrom VIN supply.

Note: The length of power supply cable must be minimized. Increasing length of PSU cable isequal to increasing the distortion for the amplifier at high output levels and low frequencies.

Maximum output stage supply voltage depends on the speaker load resistance. Check the recommendedmaximum supply voltage in the TAS5704 data sheet (SLOS563 ).

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2.2 PSC Connector

2.3 Loudspeaker and Subwoofer Connectors (2-Channel BTL Configuration)

2.4 Digital Audio Interface SPDIF (J1/OPTO)

System Interfaces

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Table 1. Recommended Power Supplies

Description Voltage Limitations Current Recommendations(8 Ωload)

System power supply 5 V 500 mAOutput power stage supply 10 – 26 V 3A

(1)

The rated current correspond to 2 channels at 20W per channel.

•Connect the positive node of the 5V (VIN) power supply to the red binding post marked VIN.•Connect the GND node of the 5V power supply to the black binding post marked GND•Connect the positive node of the high voltage power supply (PVCC) to the red binding post markedPVCC.

•Connect the negative node of the high voltage power supply (PGND) to the black binding post markedPGND.

There is no specific power up sequence for TAS5704, but it is recommended to power up the VINsupply first while reset is kept low for at least 1ms and then power up the PVCC.

CAUTION

Both positive and negative speaker outputs are floating and may not beconnected to ground (e.g. through an oscilloscope).

•Connect the positive (+) and negative (–) nodes of the left speaker to the corresponding metal bindingpost marked OUTA and OUTB on TAS5704EVM board.•Connect the positive (+) and negative (–) nodes of the right speaker to the corresponding metalbinding post marked OUTC and OUTD on TAS5704EVM board.•Install jumpers JP3–JP6 and JP7–JP10 for BTL configuration•The subwoofer is an option on this EVM, which is provided through connecting TAS5601EVM2 to theTAS5704EVM using connector J1. Connector J1 provides the power and corresponding PWMs to theTAS5601EVM2 (subwoofer amplifier). TAS5601EVM2 is configured in PBTL and is able to provide40W to an 8- Ωspeaker. Connect the subwoofer positive and negative nodes to the correspondingmetal binding posts on the TAS5601EVM2.

The Digital Audio Interface contains digital audio signal data (I2S). See TAS5704 Data sheet (SLOS563 )for signal timing and details not explained in this document.

RCA connector and OPTO connector are the two SPDIF interfaces. The switch S1 is used to togglebetween OPTO and RCA connector based on available signal source. Once the RCA cable or opticalcable is connected and the signal source is powered up, please verify the SPDIF lock indicator (blueLED3) to make sure there is viable signal available to the device.

The format of the DIR9001 SPDIF receiver can be changed using jumpers FMT0 and FMT1. Jumpersinstalled = 0. Jumpers removed = 1. The description of possible modes is printed on the EVM.

See the schematic of TAS5704EVM and the DIR9001 device for detail information on method by whichthe data and clocks are provided to TAS5704.

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