Texas Instruments TAS5706EVM2 Manual de usuario

User's GuideSLOU220 – September 2008
TAS5706EVM2
This manual describes the operation of the TAS5706EVM2 to evaluate the performance of the TAS5706A.This main contents of this document are:•Details on how to properly connect a TAS5706A Evaluation Module (TAS5706EVM2) and the details ofthe EVM.•Details on how to install and use the GUI to program the TAS5706A.•Details on how to use the audio processing features like EQ and DRC.•Quick-Start Guide for the common modes in which TAS5706EVM2 can be used
Contents1 Overview ...................................................................................................................... 21.1 TAS5706EVM2 and MC57xxPSIA Features .................................................................... 42 Installation .................................................................................................................... 42.1 EVM Installation ..................................................................................................... 52.2 Software Installation ................................................................................................ 93 Using the EVM Software .................................................................................................. 113.1 Connect the GUI to the EVM .................................................................................... 113.2 I2C Memory Tool .................................................................................................. 113.3 Volume Function .................................................................................................. 123.4 Biquad GUI ......................................................................................................... 123.5 DRC GUI ........................................................................................................... 133.6 Disable Biquads ................................................................................................... 154 TAS5706EVM2 Quick-Start Setup Guide ............................................................................... 155 Jumpers and Control Utilities on MC57xxPSIA board ................................................................. 165.1 RCA/OPTICAL Jumpers .......................................................................................... 165.2 Switches ............................................................................................................ 165.3 LED Indicators ..................................................................................................... 166 Board Layouts, Bill of Materials, and Schematic ...................................................................... 166.1 TAS5706EVM2 and MC57xxPSIA Board Layouts ............................................................ 176.2 Bill of Materials .................................................................................................... 186.3 Schematic .......................................................................................................... 187 Quick-Start Setup Guide .................................................................................................. 187.1 2 X BTL BD (Default: BD mode) ................................................................................ 207.2 2.1 AD (2 x SE + 1 x BTL via OutC and OutD) ............................................................... 217.3 2.1 BD (2 x BTL + 1 x BTL via external subwoofer amplifier TAS5601) ................................... 227.4 4 x SE AD .......................................................................................................... 237.5 4.1 AD (4 x SE + 1 x BTL via external subwoofer amplifier TAS5601) .................................... 247.6 Headphone AD .................................................................................................... 257.7 AD 2.1 Mode and Line Out (2 x BTL Speaker Out + 1 Subwoofer Out + 1 Line Out, ADMODE) .............................................................................................................. 260 BD 2.1 Mode and Line Out (2 x BTL Speaker Out + 1 Subwoofer Out + 1 Line Out, BDMODE) .............................................................................................................. 26Appendix A 2 X BTL BD (Default: BD mode) ................................................................................ 28Appendix B 2.1 AD (2 x SE + 1 x BTL via OutC and OutD) ............................................................... 29Appendix C 2.1 BD (2 x BTL + 1 x BTL via External Subwoofer TAS5601) ............................................ 30Appendix D 4 x SE AD ......................................................................................................... 31Equibit is a trademark of Texas Instruments.I
2
C is a trademark of Philips Corporation.
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1 Overview

Overview

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Appendix E 4.1 AD (4 x SE + 1 x BTL via External Subwoofer TAS5601) .............................................. 32Appendix F Headphone AD ................................................................................................... 33Appendix G 2.1 and Line out AD (2 x BTL Speaker Out + 1 Subwoofer + 1 Line out, AD MODE) .................. 34Appendix H 2.1 and Line out BD (2 x BTL Speaker + 1 Subwoofer Out + 1 Line out, BD MODE) .................. 35

List of Figures

1 TAS5706EVM2 Printed-Circuit Board ..................................................................................... 32 Complete System and EVM Signal Path Overview ..................................................................... 43 General Connection Picture ................................................................................................ 54 Connecting TAS5706EVM2 to MC57xxPSIA ............................................................................ 65 BTL Connection .............................................................................................................. 76 Single-Ended Connection ................................................................................................... 87 Graphical User Interface Initial Window ................................................................................. 108 Memory Tool Window ...................................................................................................... 119Volume Control ........................................................................................................... 1210 Selecting Biquad GUI ...................................................................................................... 1211 Filter Creation Tool Window .............................................................................................. 1312 DRC Parameters ........................................................................................................... 1313 Activating the DRC GUI ................................................................................................... 1414 Time Constants Button .................................................................................................... 1415 Disabling the Biquads ...................................................................................................... 1516 TAS5706EVM2 Top Assembly ........................................................................................... 1717 MC57xxPSIA Top Assembly .............................................................................................. 17

List of Tables

1 Recommended Power Supplies ........................................................................................... 62 Bill of Materials for TAS5706EVM2 ...................................................................................... 18

The TAS5706A evaluation module (TAS5706EVM2) demonstrates the TAS5706A device from TexasInstruments.

The TAS5706A combines a high-performance PWM processor with a class-D audio power amplifier. ThisEVM can be configured with two bridge-tied loads (BTL) (2.0) or two single-ended (SE) and one BTL sub(2.1) or four SE (4.0) modes. When operated with an external subwoofer power stage such as theTAS5601EVM4. TAS5706A supports two bridge-tied channels plus a bridge-tied subwoofer using anexternal TAS5601amplifier.For detailed information about the TAS5706A device, review the device datasheet, document number SLOS606 . Pulse Width Modulator (PWM) is based on TI's Equibit™ technology.Review the board schematic and TAS5601EVM4 documents for additional information, and more specificapplication information on the subwoofer daughter card and connectors between the two boards.

The EVM software with its graphic user interface facilitates evaluation by providing access to theTAS5706A registers through a USB port. Refer to the Using the EVM Software section for further details.

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Overview

Figure 1. TAS5706EVM2 Printed-Circuit Board

The TAS5706EVM2, together with other TI components on this board, is a complete 2.1-channel digitalaudio amplifier system. The MC57XXPSIA Controller board includes a USB interface, a digital input(SPDIF), analog inputs via the ADC (PCM1808), power inputs and other features like a mute function andpower down.

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2CH Analog Input

From Other Source/

Digital Out

PC Interface

SPDIF/

Optical, Coax TAS5706A

TAS5601EVM4

(Subwoofer)

Left

Right

PWM

Output

TAS5706EVM2MC57xxPSIA

1.1 TAS5706EVM2 and MC57xxPSIA Features

2 Installation

Installation

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Figure 2. Complete System and EVM Signal Path Overview

•Channel evaluation module design.•Self-contained protection systems and control pins•USB interface•Standard I

S data input using optical or coaxial inputs•Analog input through analog to digital converter•Subwoofer connection—the PWM terminal provides the PWM signal and power to an externalsubwoofer board•Double-sided plated-through PCB, 1-oz copper•Access to control signal gain and data format through EVM-software graphic user interface (GUI)

This section describes the EVM and software installation.

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2.1 EVM Installation

Analog In to ADC

Coaxial SPDIF Input

Optical SPDIF Input

USB Port

5V Supply for

System Power

10-26V Supply for Output Power

Speaker

Out A & B

Speaker

Out C & D

TAS5706EVM2 & MC-57xxPSIA

General Connection Picture

2.1.1 Connecting the TAS5706EVM2 to MC57xxPSIA

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Installation

Figure 3. General Connection Picture

The following are the basic tools for the initial EVM power up.•5-V, 1-A power supply (VIN)•10–26-V, 4-A power supply (PVCC)•Banana-style test leads for power supplies and speakers•Optical or coaxial cable for SPDIF interface based on signal source•USB cable•EVM software•Two 8- Ωspeakers or loads

The following sections describe the TAS5706EVM2 board in regards to power supply (PSU) and systeminterfaces.

On the right side of the MC57xxPSIA is a terminal block and another on the left of the TAS5706EVM2(labeled J1). Carefully place the MC57xxPSIA block above the TAS5706EVM2 block and gently pushdown.

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2.1.2 PSU Interface

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Figure 4. Connecting TAS5706EVM2 to MC57xxPSIA

The TAS5706EVM2 is powered by two power supplies connected to the MC57xx controller board: a 5-Vpower supply (VIN) and a 10-V to 26-V (PVCC) power supply. The 3.3-V level is generated on the boardby a voltage regulator from the 5-V supply.

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

The maximum output-stage supply voltage depends on the speaker load resistance. Check therecommended maximum supply voltage in the TAS5706A (SLOS606 ) data sheet.

Table 1. Recommended Power Supplies

Description Voltage Limitations (8- ΩLoad) Current Recommendations

System power supply 5 V 1 AOutput power stage supply 10–26 V 4 A

(1)

The rated current corresponds to two channels, full scale.

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2.1.3 Loudspeaker Connectors

OUT B

JP1 - Closed

JP2 - Closed

OUT A

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Installation

CAUTION

All speaker outputs are biased at Vcc/2 and may not be connected to ground(e.g., through an oscilloscope ground).

Loudspeaker connections vary by device setup. Consult the quick-start guide (Section 7 ) for more details.However, the following is a general guideline:

When connecting a speaker in BTL mode, connect the speaker’s two terminals (“+” and “-“) across twooutputs on the TAS5706EVM2. Ensure that the jumper (JP1 - JP4) on each output is in place.

When connecting a speaker in Single-Ended (SE) mode, connect the speaker’s “+” terminal to one EVMoutput, and the speaker’s “–“ terminal must be grounded at the output power ground (next to PVCC on theMC-57xxPSIA). Ensure that the jumper (JP1 - JP4) on each output is removed.

Speakers or loads can be connected to the outputs A-D with clip leads, or cables can be made withfemale connectors (JST VHR-2N) that can mate to male connectors on the EVM board.

Figure 5. BTL Connection

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OUT A

JP1 - Open

OUT B

JP2 - Open

2.1.4 USB Interface

2.1.5 Digital Audio Interface SPDIF (RCA/OPTO)

2.1.6 ADC Interface

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Figure 6. Single-Ended Connection

The TAS5706A registers are accessed through I

C™ bus lines SDA and SCL. The USB circuit and USBconnector on the MC57xxPSIA board facilitates the connection between a host computer and the device.The EVM USB circuit is powered by the 5-V USB line of the host PC and is independent of the powersupplies available on the board. The USB device that is used is a TAS1020B from Texas Instruments.

The Digital Audio Interface accepts digital audio data using the I

S protocol. See the TAS5706A datasheet (SLOS606 ) for more information.

The RCA connector and the OPTO connector are the two SPDIF interfaces on the MC57xxPSIA board.The switch S3 toggles between the OPTO and RCA connector to accommodate the signal source. Whenthe RCA cable or optical cable is connected and the signal source is powered up, verify that the SPDIFlock indicator (blue LED5) illuminates, confirming that a viable signal is available to the device. Install ajumper on JP4 across the middle pin and the pin marked SPDIF to connect the digital source toSDIN1.Install jumper on JP5 to connect the digital source to SDIN2.

For detailed information on how the data and clocks are provided to the TAS5706A, see the schematicappearing at the end of this document and the DIR9001 device data sheet (SLES198 ).

In the absence of a digital signal source, the PCM1808 ADC can be used to convert an analog audiosignal to a digital signal to the TAS5706A. The DIR9001 still provides clock signals to the ADC in thisprocess. The DIR9001 oscillator frequency (Y2) determines the sampling frequency in the absence of adigital signal. If the OSC frequency is 24 MHz, the sampling frequency is set at 96 kHz; if the OSC is setat 12 MHz, the sampling frequency defaults to 48 kHz when no signal is on the SPDIF input terminals. A12-MHz crystal is installed on the MC57xxPSIA board. The ADC is an additional feature of this board toprovide flexibility in sourcing an audio signal to the TAS5706A. Review the PCM1808 data sheet(SLES177 ) for a detailed description of the ADC on this EVM. Install the jumper on JP4 across the middlepin and the pin marked ADC to select ADC as the source for SDIN1.Do the same for JP5 to select theADC as the source for SDIN2. The jumpers JP2 and JP3 on MC57xxPSIA board are IN for 1 Vrms analoginput and OUT for 2 Vrms inputs.

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2.1.7 Board Power Up General Guidelines

2.2 Software Installation

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Installation

Connect the MC-57xx and the TAS5706EVM2 boards by locating pin 1 on each board, indicated by asmall white triangle. The MC-57xx plugs down onto the TAS5706EVM2 board (i.e., the TAS5706EVM2board fits underneath the MC57xxPSIA board). Pin 1 on each board must be connected to each other.

Install the EVM software on the PC before powering up the board. After connecting the loudspeakers orother loads, power supplies, and the data line, power up the 5-V power supply first; then power up thePVCC power supply. It is recommended initially to set the PVCC level to 10 V, then ramp it up to 20 V toverify cable connections.

Download the TAS570X GDE from the CD or from the TI Web site, which always has the latest release ofthe GUI. Check versions for any updates to the GUI on the TI website .

Execute the GUI install program, Setup_TAS570X_version_number.exe

Once the program is installed, the program group and shortcut icon is created in Start →Program →Texas Instruments Inc →TAS570X GDE.

THE GUI come ups as shown in Figure 7 .

Select the appropriate tab; in this case, select the TAS5705/TAS5706 tab.

It has two subwindows. One shows the Process Flow window. From the Process Flow window, each ofthe signal processing function tools can be selected by clicking on it. The Biquad GUI and the DRC GUIcan be opened by using the right button of the mouse. This window also shows input select, Mode select,Channel, and Master Volume. All functions are shown in the order that they are in the device.

The other subwindow, Properties window, has the properties where a user can update by selecting fromthe available options. The properties that are available depends on the device selected. From the mainwindow, the user must set three properties before connecting to the EVM.

Select the device, Enable/Disable auto bank switch function and set the sample rate. The TAS5706Aautomatically detects sample rates. The setting here is simply to synchronize the GUI and the device.

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Figure 7. Graphical User Interface Initial Window

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