Texas Instruments TPA5051EVM Manuel utilisateur

1 Introduction

1.1 Description

User's GuideSLOU184 – July 2006

TPA5051EVM

Contents1 Introduction .......................................................................................... 12 Software ............................................................................................. 23 Operation ............................................................................................ 64 Reference ............................................................................................ 95 TPA5051EVM Schematic Diagram ............................................................. 12

List of Figures

1 TPA5051 in I

S Mode With Separate Delays for Left and Right Channels ................. 32 TPA5051 in I

S Mode With Frame Delay........................................................ 43 TPA5051 in Right-Justified Mode ................................................................ 54 TPA5051 in I

S Mode – Unable to Communicate .............................................. 65 Top Layer of the TPA5051EVM .................................................................. 76 Bottom Layer of the TPA5051EVM .............................................................. 87 TPA5051EVM Top Layer .......................................................................... 98 TPA5051EVM Second Layer ..................................................................... 99 TPA5051EVM Third Layer ....................................................................... 1010 TPA5051EVM Bottom Layer ..................................................................... 10

List of Tables

1 Bill of Materials .................................................................................... 11

The TPA5051 evaluation module (EVM) consists of a single TPA5051 audio delay device, along with otherexternal components mounted on a printed-circuit board (PCB) that can be used to independently delaytwo digital audio streams. Each digital audio stream consists of a left and right channel, both of which canbe delayed up to 4095 samples (with a 48-kHz sampling rate, that equates to more than 85ms of delay).

The TPA5051EVM is designed to work seamlessly with the TI Input USB board, but can function as astand-alone board for pass-through testing in any system. All that is required is an I

S audio source, anI

C controller, and a 5-V supply.

The TPA5051EVM also includes an onboard digital-to-analog controller (DAC), the PCM1606, which canconvert I

S or left-justified data to an analog out. The analog out is filtered on the board and can beviewed with a scope probe.

National Instruments is a trademark of National Instruments Corporation.

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1.2 TPA5051EVM Specifications

2 Software

2.1 Installation

2.2 Software Use

Software

+5 V Supply Voltage 5 V

Supply current 150 mA maximumI

(with TI Input USB board connected) Supply current 500 mA maximum

The included compact disk (CD) has all the software and drivers necessary to properly operate theTPA5051EVM with the TI Input USB board. This software is designed to work only with personalcomputers (PC). The installation software consists of TPA505x Interface SAA,Command Tool, and .NetFramework 1.1.

1. Open up the CD, and browse the directory named TPA505x HD GUI Installer.2. Click on setup.exe. The installer will then initialize.3. Next, the user must choose the directories in which to install the software. The default directory for theTPA505x Interface SAA software is C:\Program Files\Texas Instruments Inc\, and the default directoryfor the National Instruments™ files is C:\Program Files\National Instruments\. Other directories may beused, but for purposes of convenience, the default directories are recommended.4. Once the directory selection has been made, click next to proceed.5. The National Instruments™ License Agreement appears. It is necessary to read and accept thisagreement to continue with the installation.6. Once the National Instruments™ License Agreement has been accepted, another window indicatingwhich components are to be installed appears. It should read Adding or Changing - TPA505x InterfaceSAA Files. Click next to proceed.7. The TPA505x SAA Interface program then installs the necessary files.8. Once the TPA505x SAA Interface program has been installed, the setup program begins installingCommand Tool 6.0. The Command Tool License Agreement must be read and accepted forinstallation to continue.9. On acceptance of the Command Tool License Agreement, .Net Framework 1.1 is installed. Thisinstallation procedure may take a while. When it is finished, click ok.10. Command Tool 6.0 proceeds to configure the new software. When it is finished, click Finish.11. Power up the TI Input USB Board (see the Operation section in this document), and then connect theUSB cable from the computer to the TI Input USB Board. A message pops up stating that thecomputer has found new hardware. Shortly after that message appears, the computer finds and installsthe correct drivers for it.

The TPA5051 software graphical user interface (GUI) is designed to allow the user to control the TPA5051by an I

C bus.1. Select the I

C address of the EVM by entering the address number under the I2C Address (0-7)section. The default for the program is 0. The default for the EVM is also 0. The number in the programcorresponds to the last three digits of the I

C address of the device (ADD2, ADD1, and ADD0), whichcan be controlled by installing or removing jumpers J5, J4, or J3.2. Select the mode of operation by clicking on the appropriate circle under Stream Type.3. The right and left delays can be adjusted by turning the knob to the desired number of delay samples,or simply entering the number in the box provided (see Figure 1 ). The maximum number of delaysamples per channel for the TPA5051 is 4095. The TPA505x software, however, allows forprogramming up to 8191 samples per channel. This is because the software is designed to work forboth the TPA5050 and TPA5051. A delay set above 4095 samples is not valid for the TPA5051.4. The right and left delays can be tied together by clicking on the R Track L 1 OFF/ON box to the right ofthe Right Delay knob.

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Software

5. The delay also can be controlled with the Frame Delay option. Simply click on the Frame Delay Mode1 ON/OFF box, and the frame delay options become available. Frame delay mode affects both left andright channels simultaneously (see Figure 2 ).6. Clicking on the Right Justified mode under Stream Type brings up a hidden window, called PacketLength. Through this, the number of packet lengths to be delayed can be entered (see Figure 3 ).7. The option Bypass simply sets the TPA5051 to pass the data through, without doing any manipulationto it.8. The I2C Status display at the bottom right indicates whether the device and the computer arecommunicating properly. A red status bar indicates a problem. A green status bar indicates the deviceand computer are talking (see Figure 4 ). Possible solutions to the red status bar problem are todepress and release the reset button on the TI Input USB board, check to see that all cables areproperly connected, restart the TPA5051 GUI, remove and then re-insert the USB cable into thecomputer, reboot the computer, or re-install the software.9. The list of registers on the right side of the screen (0x01 …0x10) indicate what values were last writtento that particular register. The TPA5051 has eighteen registers, however the two Complete Updateregisters are not shown on the GUI. Therefore, only registers (0x01 …0x07) and (0x09 …0x0F) areshown.

10. The channel selection tab is designed for use with the TPA5051, which has two independent digitalaudio inputs. Selecting the Channel 1 tab allows control of the registers for digital audio input 1(DATA1 of the device). Selecting the Channel 2 tab allows control of the registers for digital audio input2 (DATA2 of the device). See Figure 2

Figure 1. TPA5051 in I

S Mode With Separate Delays for Left and Right Channels

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Software

Figure 2. TPA5051 in I

S Mode With Frame Delay

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Software

Figure 3. TPA5051 in Right-Justified Mode

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3 Operation

3.1 Quick Start List for Use With the TI Input USB Board

3.2 Power Supply

3.3 EVM Preparation

Operation

Figure 4. TPA5051 in I

S Mode – Unable to Communicate

Follow these steps to use the TPA5051EVM with the TI Input USB board. This requires a digital or analogaudio source, a 5-V power supply, and the included USB and ribbon cables.

1. Ensure that all external power sources are set to OFF2. Connect an external regulated power supply set to 5 V to the module +5V (J7) and GND (J6), takingcare to observe marked polarity.

1. Ensure that the shunts are fully installed on jumpers J1 and J2. This jumper setting sets the operatingmode of the PCM1606 to I

S.2. Install the shunts across J3,J4, or J5, to set the I

C address of the TPA5051. J3,J4, and J5correspond to ADD0, ADD1, and ADD2, respectively. Installing the shunt across a given jumper pulls

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Operation

that pin high. The default is 000. Installing a shunt across J3 sets the address to 001.3. Connect the 34-pin ribbon cable between header J800 on the TI Input USB board and header H1 onthe TPA5051EVM.

4. Connect the 16-pin ribbon cable between header J850 on the TI Input USB board and header H3 onthe TPA5051EVM.

5. Connect the USB cable from the USB jack on the PC to the J350 USB Interface on the TI Input USBboard.

6. For additional delay, another TPA5051EVM can be added in series using the 16-pin and 34-pin ribboncables.

7. Install shunts across J6 and J7. For stand alone evaluation, the shunts may be removed allowing forseparate LRCLK and BCLK signals for DATA1 and DATA2.

Note: No pullup resistors are installed on the TPA5051EVM. Doing so interferes with theinitialization of the TI Input USB board in certain circumstances. However, the pads for thepullup resistors, including SDA and SCL ( R13 and R14, respectively), are available on theEVM for populating if the EVM is to be used in a stand-alone fashion

Figure 5. Top Layer of the TPA5051EVM

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3.4 Operation

Operation

Figure 6. Bottom Layer of the TPA5051EVM

1. Turn on the power supply for the TPA5051EVM.2. Start the TPA505x software.3. Depress the reset button on the TI Input USB board.4. To play to music through digital audio input 1 (DATA1), insert a signal source into the TI Input USBboard. If it is an analog source, insert it into the jack labeled CH1+2.5. To play to music through digital audio input 2 (DATA2), insert a signal source into the TI Input USBboard. If it is an analog source, insert it into the jack labeled CH3+4.6. If the source is digital, insert it into either the RCA jack or the optical jack, and ensure that the switchbetween them is selected properly.7. Play the music or other source.8. Use the GUI to mute the left or right channels, and to delay them.Note: The TI Input USB board is designed to output I

S only.9. Use scope probes to view both delayed and nondelayed signals via the DAC. TP1 and TP2 (left andright, respectively) are the delayed signals from DATA_OUT1 of the TPA5051. TP3 and TP4 (left andright, respectively) are the original signals input to DATA1. TP5 and TP6 are the delayed signals fromDATA_OUT2 of the TPA5051. The EVM is not configured to allow the PCM1606 to display the originalsignals input to DATA2.10. External amplifiers can be connected to the output of the PCM1606; however, the supplied AGND testpoint should be used as the ground reference for external amplifiers. Consult the PCM1606 data sheetfor more information regarding this topic.

Note: TP7 and TP8 (SDA and SCL, respectively), are placed for convenient viewing of the I

Csignals only. If it is necessary or desired to manually control the TPA5051 withindependent software, the 34 pin connector of the TI Input USB Board must first beremoved.

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4 Reference

4.1 TPA5051EVM PCB Layers

Reference

Figure 7. TPA5051EVM Top Layer

Figure 8. TPA5051EVM Second Layer

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Reference

Figure 9. TPA5051EVM Third Layer

Figure 10. TPA5051EVM Bottom Layer

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