Texas Instruments TAS5708EVM User manual

User's GuideSLOU232A – January 2009 – Revised January 2009
TAS5708(TAS5710)EVM
This manual describes the operation of the TAS5708(TAS5710)EVM to evaluate the performance of theTAS5708/10. The main contents of this document are:•Details on how to properly connect a TAS5708/10 Evaluation Module (EVM) and the details of theEVM.
•Details on how to install and use the GUI to program the TAS5708/10.•Details on how to use the audio processing features like EQ and DRC.•Quick-Start Guide for the common modes in which TAS5708/10 EVM can be used.
Contents1 Overview ...................................................................................................................... 31.1 TAS5708(TAS5710)EVM and MC57xxPSIA Features......................................................... 32 Installation .................................................................................................................... 42.1 EVM Installation ..................................................................................................... 42.2 Software Installation ................................................................................................ 73 Using the EVM Software .................................................................................................... 93.1 Connect the GUI to the EVM ...................................................................................... 93.2 I2C Memory Tool ................................................................................................... 93.3 Volume Function .................................................................................................. 103.4 Biquad GUI ......................................................................................................... 103.5 DRC GUI ........................................................................................................... 114 MODULATION SCHEME ................................................................................................. 124.1 2 X BTL BDAD (Default: BD mode) ............................................................................. 135 Advanced Audio Processing Features in TAS5710 ................................................................... 136 Jumpers and Control Utilities on MC57xxPSIA board ................................................................. 156.1 RCA/OPTICAL Jumpers .......................................................................................... 156.2 Switches ............................................................................................................ 156.3 LED Indicators ..................................................................................................... 157 Board Layouts, Bill of Materials, and Schematic ...................................................................... 167.1 TAS5708(TAS5710)EVM and MC57xxPSIA Board Layouts ................................................ 167.2 Bill of Materials .................................................................................................... 187.3 Schematic .......................................................................................................... 20
List of Figures
1 TAS5708(TAS5710)EVM Printed-Circuit Board ......................................................................... 32 Complete System and EVM Signal Path Overview ..................................................................... 33 General Connection Picture ................................................................................................ 44 Connecting TAS5708(TAS5710)EVM to MC57xxPSIA ................................................................. 55 BTL Connection .............................................................................................................. 66 Process Flow for TAS5708 UG ............................................................................................ 87 Process Flow for TAS5710 UG ............................................................................................ 88 Memory Tool Window ....................................................................................................... 99 Volume Control ............................................................................................................. 1010 Selecting Biquad GUI ...................................................................................................... 1011 Filter Creation Tool Window .............................................................................................. 11
Equibit is a trademark of Texas Instruments.I
2
C is a trademark of Philips Corporation.
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12 DRC Parameters ........................................................................................................... 1113 Activating the DRC GUI ................................................................................................... 1214 Time Constants Button .................................................................................................... 1215 TAS5708(TAS5710)EVM Top Composite Assembly .................................................................. 1616 TAS5708(TAS5710)EVM Top Copper Assembly ...................................................................... 1717 MC57xxPSIA Top Assembly .............................................................................................. 17
List of Tables
1 Recommended Power Supplies ........................................................................................... 52 Bill of Materials for TAS5708EVM ....................................................................................... 183 Bill of Materials for TAS5710EVM ....................................................................................... 18
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1 Overview
2CH Analog Input
From Other Source/
Digital Out
PC Interface
SPDIF/
Optical, Coax TAS5708/10
Left
Right
TAS5708/10 EVMMC57xxPSIA
1.1 TAS5708(TAS5710)EVM and MC57xxPSIA Features
www.ti.com Overview
The TAS5708/10 evaluation module (EVM) demonstrates the TAS5708/10 device from Texas Instruments.
The TAS5708/10 combines a high-performance PWM processor with a class-D audio power amplifier.This EVM can be configured with two bridge-tied loads (BTL) (2.0). For detailed information about theTAS5708/10 device, review the device data sheet (SLOS570) . The Pulse Width Modulator (PWM) isbased on TI's Equibit™ technology.
The EVM software with its graphic user interface (GUI) facilitates evaluation by providing access to theTAS5708/10 registers through a USB port. See the Using the EVM Software section for further details.
Figure 1. TAS5708(TAS5710)EVM Printed-Circuit Board
The TAS5708(TAS5710)EVM, together with other TI components on this board, is a complete 2.1-channeldigital audio amplifier system. The MC57xxPSIA Controller board includes a USB interface, a digital input(SPDIF), analog inputs via the ADC, power inputs, and other features like a mute function and powerdown.
Figure 2. Complete System and EVM Signal Path Overview
•Channel evaluation module design•Self-contained protection systems and control pins•USB interface•Standard I
2
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, 2 mm•Access to control signal gain and data format through EVM-software GUI
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2 Installation
2.1 EVM Installation
Analog In to ADC
Coaxial SPDIF Input
Optical SPDIF Input
USB Port
5 V Supply for
System Power
10 V–26 V Supply for Output Power
Speaker
Out A & B
Speaker
Out C & D
MC57xxPSIA
Controller Board
2.1.1 Connecting the TAS5708(TAS5710)EVM to MC57xxPSIA
Installation www.ti.com
This section describes the EVM and software 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 TAS5708(TAS5710)EVM board in regards to power supply (PSU) andsystem interfaces.
On the right side of the MC57xxPSIA is a terminal block and another on the left of theTAS5708(TAS5710)EVM (labeled J1). Carefully place the MC57xxPSIA block above the EVM, and gentlypush down.
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2.1.2 PSU Interface
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Figure 4. Connecting TAS5708(TAS5710)EVM to MC57xxPSIA
The TAS5708(TAS5710)EVM is powered by two power supplies connected to the MC57xx controllerboard: a 5-V power supply (VIN) and a 10-V to 26-V (PVCC) power supply. The 3.3-V level is generatedon the board by 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 TAS5708/10 (SLOS570 ) 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)
(1)
The rated current corresponds to two channels, full scale.
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2.1.3 Loudspeaker Connectors
+–
OUT B
OUT A
2.1.4 USB Interface
2.1.5 Digital Audio Interface SPDIF
2.1.6 ADC Interface
Installation www.ti.com
CAUTION
All speaker outputs are biased at Vcc/2 and must not be connected to ground(e.g., through an oscilloscope ground).
Loudspeaker connections vary by device setup. Consult the quick-start guide (Section 4 ) for more details.However, the following is a general guideline:
When connecting a speaker in BTL mode, connect the speaker’s two terminals (A & B or C & D) across twooutputs on the TAS5708(TAS5710)EVM.
Speakers or loads can be connected to the outputs A-D with clip leads, or cables can be madewith female connectors (JST VHR-2N) that can mate to male connectors on the EVM board.
Figure 5. BTL Connection
The TAS5708/10 registers are accessed through I
2
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 SPDIF (RCA/OPTO) accepts digital audio data using the I
2
S protocol. See theTAS5708/10 data sheet (SLOS570 ) 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 to SDIN1.
For detailed information on how the data and clocks are provided to the TAS5708/10, 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 TAS5708/10. 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, or if the OSC is set at 12 MHz, the sampling frequency
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2.1.7 Board Power-Up General Guidelines
2.2 Software Installation
www.ti.com Installation
defaults to 48 kHz when no signal is on the SPDIF input terminals. A 12-MHz crystal is installed on theMC57xxPSIA board. The ADC is an additional feature of this board to provide flexibility in sourcing anaudio signal to the TAS5708/10. Review the PCM1808 data sheet (SLES177 ) for a detailed description ofthe ADC on this EVM. Install the jumper on JP4 across the middle pin and the pin marked ADC to selectADC as the source for SDIN1.
Connect the MC-57xx and the TAS5708(TAS5710)EVM boards by locating pin 1 on each board, indicatedby a small white triangle. The MC-57xx plugs down onto the TAS5708(TAS5710)EVM board (i.e., theTAS5708(TAS5710)EVM board fits underneath the MC57xxPSIA board). Pin 1 on each board must beconnected to each other.
Install the EVM software on the personal computer (PC) before powering up the board. After connectingthe loudspeakers or other loads, power supplies, and the data line, power up the 5-V power supply first;then power up the PVCC power supply. It is recommended initially to set the PVCC level to 10 V, thenramp it up to 20 V to verify cable connections.
Download the TAS570X GDE from TI Web site. The TI Web site always has the latest release of the GUIand any update versions.
Execute the GUI install program, Setup.exe. Once the program is installed, the program group andshortcut icon is created in Start →Program →Texas Instruments Inc →TAS570X GDE. THE GUI comeups as shown in Figure 6 .
Select the appropriate tab, in this case select TAS5708 (or TAS5710) tab. It has two subwindows. Oneshows the Process Flow window. From the Process Flow window, each signal processing function toolcan be selected by clicking on it. The Biquad GUI and the DRC GUI can be opened by using the rightbutton of the mouse. This window also shows Input select, Mode select, Channel, and Master Volume. Allfunctions are shown in the order in which they appear in the device.
The other subwindow, Properties window, has the properties where a user can update by selecting fromthe available options. The properties available depend on the device selected. From the main window, theuser must set three properties before connecting to the EVM.
Select the device Enable/Disable auto bank switch function, and set the sample rate. The TAS570xautomatically detects sample rates. The setting is simply to synchronize the GUI and the device.
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Figure 6. Process Flow for TAS5708 UG
Figure 7. Process Flow for TAS5710 UG
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3 Using the EVM Software
3.1 Connect the GUI to the EVM
3.2 I2C Memory Tool
www.ti.com Using the EVM Software
Once the properties window selections have been made, go to the menu Target →Connect. This sendsthe initialization commands to the device. Master volume is in mute. Select the master volume function.Type the required volume in the properties window. For TAS5708/10, type –12 dB. The difference is dueto the power stage gain in both devices. At this time, audio, if connected properly, plays through thedevice. Check the All channel shutdown button. It should be un-checked. When the Connect command isissued, if an error appears that indicates a USB problem. Check the connections, and press the USBRESET button on the controller board. Then disconnect and re-connect from the Target menu.
This tool can be opened from GDE (Tools →I2C Memory Tool) or independent of GDE from Start →Program →Texas Instruments Inc →Memory Tool
Select I2C as show in Figure 8 .
Figure 8. Memory Tool Window
I
2
C registers can be written or read using this tool. The I
2
C command file can be sent by selecting thecommand file and Execute command.
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3.3 Volume Function
3.4 Biquad GUI
Using the EVM Software www.ti.com
Individual and Master volume can be selected, and the required volume value can be entered by typing onthe Property Window after selecting the function with the mouse (see Figure 9 ).
Figure 9. Volume Control
Using the right button of mouse, select Biquad GUI (Figure 10 ).
Figure 10. Selecting Biquad GUI
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