Texas Instruments TAS5780M User manual

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TAS5780M Evaluation Module
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All other trademarks are the property of their respective owners.
User's Guide
SLAU694–December 2016
TAS5780M Evaluation Module
This user’s guide describes the operation of the TAS57780M Evaluation Modules (EVM). The EVM is
connected to the PurePath™ Console Motherboard (PPCMB). The main contents of this document are:
• Hardware descriptions and implementation
• Start-up procedure using PurePath Console3 (PPC3) software with TAS5780M plug-in
Related documents:
• TAS5780M Data Sheet (SLASEG7)
• PurePath Console Motherboard User’s Guide (SLOU366)
• PurePath Graphic Development Suite (PurePath Console)
• PurePath Console 3 User Manual (SLOU408)
Required equipment and accessories:
1. TAS5780MEVM
2. PurePath Console Motherboard
3. A USB micro type-B cable
4. Power Supply Unit (PSU) 8 – 26.4 VDC
5. Speakers and cables
6. Desktop or laptop running Windows 7, Windows 8 or Windows 8.1
7. Audio source: This can be a DVD player with appropriate SPDIF cable or Playback Media from
Windows 7, Windows 8 or Windows 8.1

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1 Hardware Overview
The TAS5780MEVM showcases the latest TI digital input Class-D closed loop amplifier. The TAS5780M is
an I2S or TDM input class D amplifier with 96-kHz processing. The EVM is used in conjunction with the
PurePath Console Motherboard (PPCMB). The PVDD supply is provided via the TAS5780EVM and is
regulated to 5 VDC and 3.3 VDC on the PPCMB. The PPCMB provides the I2S, I2C, and 3.3 VDC to the
TAS5780MEVM.
Figure 1. TAS5780MEVM
1.1 Features
• GUI control via USB port
• Stereo and mono channels with I2S input
• Processed and non-processed mono channel I2S input
• Operates in BTL or PBTL
1.2 Functions
The TAS5780MEVM is controlled by the PPCMB. The PPCMB sends I2C commands from PPC3 to the
TAS5780M. Upon PPC3 execution and connection, the TAS5780M is put in software mode.
The digital audio data input to the TAS5780EVM is sent from PPCMB and is selectable from USB audio,
optical SPDIF, coaxial SPDIF, PSIA (external I2S), and analog ADC sources. When a digital audio data
input is selected, the PPC3 automatically sends appropriate scripts to the device in use.

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1.3 Detailed Operations
Upon power-on, the PPCMB uses USB audio input (default). The I2S signals LRCLK, SCLK, SDIN and
MCLK come from the TAS1020B. foobar2000 or similar non-processing media source can be used to
stream audio. The TAS1020B enumerates as the following device on a Microsoft® Windows®operating
system (OS): USB audio (USB-AudioEVM), Human Interface Devices, and USB Composite Device, see
Figure 2.
Figure 2. Device Manager

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2 Hardware Setup
Step 1: Connect the PPCMB to the TAS5780MEVM.
Step 2: Connect speakers to TAS5780MEVM.
Step 3: Connect a PSU to the TAS5780MEVM and turn on the power. 5-V and 3.3-V LEDs (Yellow) are
illuminated. The USB Lock LED (Blue) is also illuminated.
Step 4: Plug in a USB cable from the PC to the PPCMB.
Step 5: If an optical SPDIF source is used, the blue SPDIF clock-locked LED is illuminated.
Figure 3. PPCMB and TAS5780MEVM Connection

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3 Software Overview
3.1 PurePath Console 3 (PPC3)
PurePath™ Console 3 (PPC3) is a software platform for Texas Instruments’ audio devices. Many of these
audio devices can be configured, tuned and validated. This platform has the ability to support a number of
TI’s audio devices with features that make the audio tuning experience more intuitive and exciting. Access
can be requested on http://www.ti.com/tool/PUREPATHCONSOLE.
Once approval is given, go to www.ti.com/mysecuresoftware to download the software. After login, users
will see this webpage with a similar list of software products available for download.
Figure 4. PPC3 Download Window
Run the installation program. Also download the PPC3 User Manual (SLOU408) for further instructions.
The following window is displayed when PPC3 is launched for the first time.

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When the window in Figure 5 is displayed, click on “sign in” to see TAS5780 EVM application. Click on
TAS5780M box to download TAS5780M EVM App. Installation window will pop up, then click “Install”.
Figure 5. PPC3 Window

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After installation, TAS5780 EVM box will appear in “Installed EVM Apps” section, see Figure 6. Click on
TAS5780 box to launch TAS5780 App.
Figure 6. Installed EVM Apps

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3.2 TAS5780M Home Page
When the TAS5780M EVM App is launched, the TAS5780M Home Page is shown, see Figure 7. It
displays features that are available for that EVM. When a feature is selected, then the respective page is
loaded.
If the EVM is powered on and the USB is connected to the PC, the Home Page will display “Connect”
button in the bottom left corner. If the USB is not connected, only “TAS5780M – offline” is shown.
There are six pages available in the TAS5780 EVM App: System Checks, Direct I2C, Audio I/O, Register
Map, End System Integration and Tuning and Audio Processing.
Figure 7. TAS5780M Home Page

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3.3 System Checks
The System Checks Page (See Figure 8) is used to determine whether the EVM can be configured
correctly and receive audio stream from PC via USB. These checks will complete in a few minutes if no
problem is detected. It is recommended to run the system checks before proceeding to the Turning and
Audio Processing section.
Figure 8. System Checks Page

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3.4 Direct I2C
The I/O tab in the Direct I2C has two sub sections. The Input section has the provision to enter the read or
write commands scripts. Clicking the Execute button will execute the commands written in the Input
section. The status of the execution is displayed in the Output section as shown in Figure 9.
The Checksum button on the right is used to compute the checksum value of a cfg file. Load a cfg file by
clicking the Checksum button and then the computed XOR and CRC checksum will show on the Output
section
Figure 9. Direct I2C Page, I/O Tab

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The Log tab in the Direct I2C displays the I2C command history, if the record option is enabled. The log tab
has a search option to search for a particular command. The search key can be found at the top left of the
window with the search icon. ‘Save to a file’ can be used to save the log as a .cfg file. ‘Delete Output’
clears the log history. ‘Copy to a Clipboard’ copies the log text to the clipboard. Clicking the ‘Start
Recording’ button starts recording the I2C transactions and displays them in the log window. ‘Stop
Recording’ stops recording I2C transactions.
Figure 10. Direct I2C Page, Log Tab

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3.5 Audio I/O
This tool selects the desired audio input to the EVM. USB, coax, analog ,optical and PSIA (external I2S)
are supported by the motherboard. USB audio source is selected as default.
Figure 11. Audio I/O Page

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3.6 Register Map
The Register Map Page shows the current I2C register values (hexadecimal) in the TAS5780M and it can
be also used to change the register values. Manually changing register values is accomplished by double-
clicking in the desired bit to change. Clicking on Read All Registers allows monitoring of the register status
of the amplifier. The Fields section shows the register name and a brief description of each bit that affects
the selected register.
Figure 12. Register Map Page

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3.7 End System Integration
The End System Integration Page offers a powerful tool to generate a configuration file to use with
processors and a method to debug the device in the end system. Three options are available: (1) Dump
Current State into a Header file, (2) In-System Debugging and (3) In-System Tuning.
Figure 13. End System Integration Page

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3.7.1 Dump Current State into a Header File
This tool is used to generate a header or configuration file for the evaluated device according to the
features evaluated and configured with PPC3. A few settings are available for file generation, including the
format, end system I2C address, burst length and so forth. The generated file can be saved in the PC or
shown in the output window on the right.
Figure 14. Header File Generation

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3.7.2 In-System Debugging
This tool helps debug the device which is already integrated in the end-system. This is possible by
connecting the I2C signals of the end-system device to the SCL, SDA, and GND test points of PPCMB.
Only Register Map and Direct I2C will be available in this mode. Leave the In-System Debugging Mode by
clicking on the Disconnect button on the bottom left corner of the window.
Figure 15. In-System Debugging

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3.7.3 In-System Tuning
Even if the device is integrated in the end application, it is still possible to make fine adjustments with the
help of In-System Tuning. Like the In-System Debugging above, this is done by connecting I2C signals
from PPCMB to the TAS5780M device in the end-system.
Figure 16. In-System Tuning

Audio right in
L2L
Gain
L2R
Gain
R2L
Gain
R2R
Gain
+
+
Audio left in Audio left out
Audio right out
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3.8 Tuning and Audio Processing
3.8.1 Input Mixer
The input mixer can be used to mix the left and right channel input signals as shown in Figure 17. The
input mixer has four coefficients, which control the mixing and gains of the input signals.
Figure 17. Input Mixer
Table 1 shows the default values of the four coefficients in the Basic Tab (see Figure 18). If the Invert
Phase boxes are selected, the L2L / R2R Gain will simply be -1.
Figure 18. Basic Tab

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Table 1. Coefficient Values in Basic Tab
Coefficient Value
L2L Gain 1
L2L Gain 0
R2L Gain 0
R2R Gain 1
Switch to the Advanced tab (see Figure 19) if all the four coefficients need to be adjusted. Note that the
four parameters need to be specified in decibels (dB). Like the Invert Phase boxes in the Basic tab, the
Inv Phase options will reverse the sign of the gain values.
Figure 19. Advanced Tab
3.8.2 Sample Rate Configuration
The process flow in the TAS5780M is based on 96 kHz audio signals, but can support multiple sample
rates: 96 kHz, 88.2 kHz, 48 kHz, 44.1 kHz and 32 kHz. To achieve the rates, It uses its interpolator and
two Equalizer banks.
The interpolator can be configured to work with 1x, 2x or 3x. While playing 96 kHz, 88.2 kHz, 48 kHz and
44.1 kHz, TAS5780M is configured in auto mode to detect sample rates and interpolate. When 32 kHz
audio is played, a 3x interpolator should be activated by writing an additional script. PPC3 automatically
does this when the 32kHz sample rate is chosen.
The EQ Bank 1 will have equalizer coefficients computed for the 96 kHz. When second EQ bank is
enabled, EQ Bank 2 will have equalizer coefficients computed for 88.2 kHz. When playing 88.2 kHz or
44.1 kHz audio, TAS5780M needs to be configured to use the EQ Bank 2. PPC3 automatically does this
when the 88.2 kHz or 44.1 kHz sample rate is chosen
Table 2. Sample Rates and Corresponding EQ Banks
Sample Rate Auto Detected Interpolation EQ Bank
96 kHz Yes 1x Bank 1
88.2 kHz Yes 1x Bank 2
48 kHz Yes 2x Bank 1
44.1 kHz Yes 2x Bank 2
32 kHz No 3x Bank 1

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Figure 20 shows the Sample Rate Configuration Tab. Choose your preferred audio source in the Audio I/O
page and then select a proper sampling rate of audio in the dropdown box. Either Bank 1 or Bank 2 will be
active after the sampling rate is entered.
The Sync Bank 1 and 2 box is used to make sure the equalizer coefficients on Bank 1 and Bank 2 are
synchronized when either of them is changed.
Figure 20. Sample Rate Configuration
3.8.3 Equalize
The Equalizer window contains 12 independent filters designed for tuning the frequency response of the
overall system. This is where the bulk of the frequency compensation occurs. Complex tuning shapes can
be made to compensate for deficiencies in speaker response.
Figure 21. Equalizer Tuning Window