User's Guide
SLOU220 – 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 of
the 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
Contents
1 Overview ...................................................................................................................... 2
1.1 TAS5706EVM2 and MC57xxPSIA Features .................................................................... 4
2 Installation .................................................................................................................... 4
2.1 EVM Installation ..................................................................................................... 5
2.2 Software Installation ................................................................................................ 9
3 Using the EVM Software .................................................................................................. 11
3.1 Connect the GUI to the EVM .................................................................................... 11
3.2 I2C Memory Tool .................................................................................................. 11
3.3 Volume Function .................................................................................................. 12
3.4 Biquad GUI ......................................................................................................... 12
3.5 DRC GUI ........................................................................................................... 13
3.6 Disable Biquads ................................................................................................... 15
4 TAS5706EVM2 Quick-Start Setup Guide ............................................................................... 15
5 Jumpers and Control Utilities on MC57xxPSIA board ................................................................. 16
5.1 RCA/OPTICAL Jumpers .......................................................................................... 16
5.2 Switches ............................................................................................................ 16
5.3 LED Indicators ..................................................................................................... 16
6 Board Layouts, Bill of Materials, and Schematic ...................................................................... 16
6.1 TAS5706EVM2 and MC57xxPSIA Board Layouts ............................................................ 17
6.2 Bill of Materials .................................................................................................... 18
6.3 Schematic .......................................................................................................... 18
7 Quick-Start Setup Guide .................................................................................................. 18
7.1 2 X BTL BD (Default: BD mode) ................................................................................ 20
7.2 2.1 AD (2 x SE + 1 x BTL via OutC and OutD) ............................................................... 21
7.3 2.1 BD (2 x BTL + 1 x BTL via external subwoofer amplifier TAS5601) ................................... 22
7.4 4 x SE AD .......................................................................................................... 23
7.5 4.1 AD (4 x SE + 1 x BTL via external subwoofer amplifier TAS5601) .................................... 24
7.6 Headphone AD .................................................................................................... 25
7.7 AD 2.1 Mode and Line Out (2 x BTL Speaker Out + 1 Subwoofer Out + 1 Line Out, AD
MODE) .............................................................................................................. 26
0 BD 2.1 Mode and Line Out (2 x BTL Speaker Out + 1 Subwoofer Out + 1 Line Out, BD
MODE) .............................................................................................................. 26
Appendix A 2 X BTL BD (Default: BD mode) ................................................................................ 28
Appendix B 2.1 AD (2 x SE + 1 x BTL via OutC and OutD) ............................................................... 29
Appendix C 2.1 BD (2 x BTL + 1 x BTL via External Subwoofer TAS5601) ............................................ 30
Appendix D 4 x SE AD ......................................................................................................... 31
Equibit is a trademark of Texas Instruments.
I2C is a trademark of Philips Corporation.
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Overview
Appendix E 4.1 AD (4 x SE + 1 x BTL via External Subwoofer TAS5601) .............................................. 32
Appendix F Headphone AD ................................................................................................... 33
Appendix G 2.1 and Line out AD (2 x BTL Speaker Out + 1 Subwoofer + 1 Line out, AD MODE) .................. 34
Appendix 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 ..................................................................................... 3
2 Complete System and EVM Signal Path Overview ..................................................................... 4
3 General Connection Picture ................................................................................................ 5
4 Connecting TAS5706EVM2 to MC57xxPSIA ............................................................................ 6
5 BTL Connection .............................................................................................................. 7
6 Single-Ended Connection ................................................................................................... 8
7 Graphical User Interface Initial Window ................................................................................. 10
8 Memory Tool Window ...................................................................................................... 11
9 Volume Control ........................................................................................................... 12
10 Selecting Biquad GUI ...................................................................................................... 12
11 Filter Creation Tool Window .............................................................................................. 13
12 DRC Parameters ........................................................................................................... 13
13 Activating the DRC GUI ................................................................................................... 14
14 Time Constants Button .................................................................................................... 14
15 Disabling the Biquads ...................................................................................................... 15
16 TAS5706EVM2 Top Assembly ........................................................................................... 17
17 MC57xxPSIA Top Assembly .............................................................................................. 17
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List of Tables
1 Recommended Power Supplies ........................................................................................... 6
2 Bill of Materials for TAS5706EVM2 ...................................................................................... 18
1 Overview
The TAS5706A evaluation module (TAS5706EVM2) demonstrates the TAS5706A device from Texas
Instruments.
The TAS5706A 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) 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 the
TAS5601EVM4. TAS5706A supports two bridge-tied channels plus a bridge-tied subwoofer using an
external TAS5601amplifier.For detailed information about the TAS5706A device, review the device data
sheet, 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 specific
application 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 the
TAS5706A 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 digital
audio 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 and
power down.
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2CH AnalogInput
FromOtherSource/
DigitalOut
PCInterface
SPDIF/
Optical,Coax
TAS5706A
TAS5601EVM4
(Subwoofer)
Left
Right
PWM
Output
TAS5706EVM2MC57xxPSIA
Installation
Figure 2. Complete System and EVM Signal Path Overview
1.1 TAS5706EVM2 and MC57xxPSIA Features
• Channel evaluation module design.
• Self-contained protection systems and control pins
• USB interface
• Standard I2S 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 external
subwoofer board
• Double-sided plated-through PCB, 1-oz copper
• Access to control signal gain and data format through EVM-software graphic user interface (GUI)
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2 Installation
This section describes the EVM and software installation.
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AnalogInto ADC
CoaxialSPDIFInput
OpticalSPDIFInput
USBPort
5VSupplyfor
SystemPower
10-26VSupplyforOutputPower
Speaker
Out A &B
Speaker
OutC&D
TAS5706EVM2&MC-57xxPSIA
GeneralConnectionPicture
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Installation
2.1 EVM Installation
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- Ω speakers or loads
The following sections describe the TAS5706EVM2 board in regards to power supply (PSU) and system
interfaces.
2.1.1 Connecting the TAS5706EVM2 to MC57xxPSIA
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 push
down.
Figure 3. General Connection Picture
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Installation
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2.1.2 PSU Interface
Figure 4. Connecting TAS5706EVM2 to MC57xxPSIA
The TAS5706EVM2 is powered by two power supplies connected to the MC57xx controller board: a 5-V
power supply (VIN) and a 10-V to 26-V (PVCC) power supply. The 3.3-V level is generated on 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 cable
increases 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 the
recommended maximum supply voltage in the TAS5706A (SLOS606 ) data sheet.
Table 1. Recommended Power Supplies
Description Voltage Limitations (8- Ω Load) Current Recommendations
System power supply 5 V 1 A
Output power stage supply 10–26 V 4 A
(1)
The rated current corresponds to two channels, full scale.
(1)
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+
-
OUTB
JP1-Closed
JP2-Closed
OUT A
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2.1.3 Loudspeaker Connectors
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 two
outputs 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 EVM
output, and the speaker’s “–“ terminal must be grounded at the output power ground (next to PVCC on the
MC-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 with
female connectors (JST VHR-2N) that can mate to male connectors on the EVM board.
Installation
CAUTION
All speaker outputs are biased at Vcc/2 and may not be connected to ground
(e.g., through an oscilloscope ground).
Figure 5. BTL Connection
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+
-
OUT A
+
-
JP1-Open
OUTB
JP2-Open
Installation
2.1.4 USB Interface
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Figure 6. Single-Ended Connection
The TAS5706A registers are accessed through I2C™ bus lines SDA and SCL. The USB circuit and USB
connector 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 power
supplies available on the board. The USB device that is used is a TAS1020B from Texas Instruments.
2.1.5 Digital Audio Interface SPDIF (RCA/OPTO)
The Digital Audio Interface accepts digital audio data using the I2S protocol. See the TAS5706A data
sheet (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. When
the RCA cable or optical cable is connected and the signal source is powered up, verify that the SPDIF
lock indicator (blue LED5) illuminates, confirming that a viable signal is available to the device. Install a
jumper on JP4 across the middle pin and the pin marked SPDIF to connect the digital source to
SDIN1.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 schematic
appearing at the end of this document and the DIR9001 device data sheet (SLES198 ).
2.1.6 ADC Interface
In the absence of a digital signal source, the PCM1808 ADC can be used to convert an analog audio
signal to a digital signal to the TAS5706A. The DIR9001 still provides clock signals to the ADC in this
process. The DIR9001 oscillator frequency (Y2) determines the sampling frequency in the absence of a
digital signal. If the OSC frequency is 24 MHz, the sampling frequency is set at 96 kHz; if the OSC is set
at 12 MHz, the sampling frequency defaults to 48 kHz when no signal is on the SPDIF input terminals. A
12-MHz crystal is installed on the MC57xxPSIA board. The ADC is an additional feature of this board to
provide 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 middle
pin and the pin marked ADC to select ADC as the source for SDIN1.Do the same for JP5 to select the
ADC as the source for SDIN2. The jumpers JP2 and JP3 on MC57xxPSIA board are IN for 1 Vrms analog
input and OUT for 2 Vrms inputs.
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2.1.7 Board Power Up General Guidelines
Connect the MC-57xx and the TAS5706EVM2 boards by locating pin 1 on each board, indicated by a
small white triangle. The MC-57xx plugs down onto the TAS5706EVM2 board (i.e., the TAS5706EVM2
board 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 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, then ramp it up to 20 V to
verify cable connections.
2.2 Software Installation
Download the TAS570X GDE from the CD or from the TI Web site, which always has the latest release of
the 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 of
the signal processing function tools can be selected by clicking on it. The Biquad GUI and the DRC GUI
can 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 from
the available options. The properties that are available depends on the device selected. From the main
window, 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 TAS5706A
automatically detects sample rates. The setting here is simply to synchronize the GUI and the device.
Installation
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Installation
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Figure 7. Graphical User Interface Initial Window
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3 Using the EVM Software
3.1 Connect the GUI to the EVM
Once the properties window selections have been made, go to the menu Target → Connect.
This sends the initialization commands to the device. Master volume is in mute. Select the master volume
function. Type the required volume in the properties window. For TAS5706A, type –12 dB. For TAS5705,
type 0 dB. The difference is due the power stage gain in both devices. At this time, audio, if connected
properly, plays through the device. Check All channel shutdown button. It must be un-checked. When the
Connect command is issued, if an error appears that indicates a USB problem. Check the connections
and press USB RESET button on the controller board. Then disconnect and re-connect from the Target
menu.
3.2 I2C Memory Tool
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 .
Using the EVM Software
Figure 8. Memory Tool Window
I2C registers can be written or read using this tool. I2C command file can be sent by selecting the
command file and Execute command.
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Using the EVM Software
3.3 Volume Function
Individual and Master volume can be selected, and the required volume value can be entered by typing on
the property Window after selecting the function with the mouse (see Figure 9 ).
3.4 Biquad GUI
Using the right button of mouse, select Biquad GUI (Figure 10 ).
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Figure 9. Volume Control
Figure 10. Selecting Biquad GUI
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Using the EVM Software
Figure 11. Filter Creation Tool Window
Check mark selects the Biquad. If not selected, the Biquad is in ALL PASS Mode.
Frequency response for the current settings can be viewed and adjusted in Frequency Response
Window Tab (Figure 11 ). Individual Biquad Gains must be within ± 12 db.
Apply from the filter data window sends all the three banks of coefficients (providing auto bank is
enabled).
3.5 DRC GUI
Clicking on the function selects DRC GUI (Figure 12 ). Click on the DRC function, and check to see if DRC
is enabled in the property window.
Figure 12. DRC Parameters
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