Texas Instruments TAS5753MDEVM User manual

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TAS5753MD Evaluation Module
PurePath is a trademark of Texas Instruments.
User's Guide
SLAU683–May 2016
TAS5753MD Evaluation Module
This user’s guide describes the operation of the TAS5753MD evaluation module (EVM). The EVM is
connected to the PurePath™ Console Motherboard (PPCMB) and is configured using PurePath Console 3
(PPC3) software. Visit the e2e Audio Amplifiers forum for questions and other support issues.
The main contents of this document are:
• Details for properly connecting a TAS5753MD evaluation module (EVM) and the details of the EVM
• Start-up procedure using PurePath Console 3 (PPC3) software with the correct plugin for the EVM
• Quick-start guide for the common modes in which the TAS5753MDEVM is used
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with
the TAS5753MDEVM evaluation module, unless otherwise noted.
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Contents
1 Overview...................................................................................................................... 2
2 EVM Setup.................................................................................................................... 3
3 Using the TAS5753MDEVM with PurePath Console 3................................................................. 4
4 Board Layout, Bill of Materials, and Schematic ........................................................................ 14
List of Figures
1 TAS5753MD Evaluation Board ............................................................................................ 2
2 Evaluation Module and PurePath Console Motherboard Connection ................................................ 3
3 TAS5753MD Application in PurePath Console 3........................................................................ 4
4 TAS5753MD Application Home Window ................................................................................. 5
5 TAS5753MDEVM Audio Processing Windows .......................................................................... 7
6 Equalizer Window............................................................................................................ 8
7 Multiband AGL – Three-Band Crossover................................................................................. 9
8 Full-Band AGL.............................................................................................................. 11
9 TAS5753MDEVM .......................................................................................................... 14
10 TAS5753MD Layout ....................................................................................................... 14
11 Bottom Layer Thermal Flow .............................................................................................. 15
12 TAS5753MDEVM Optional Features .................................................................................... 15
13 TAS5753MDEVM Top Composite ....................................................................................... 16
14 TAS5753MDEVM Top Layer ............................................................................................. 16
15 TAS5753MDEVM Ground Layer ......................................................................................... 17
16 TAS5753MDEVM Power Layer .......................................................................................... 17
17 TAS5753MDEVM Bottom Layer.......................................................................................... 18
18 TAS5753MDEVM Bottom Composite ................................................................................... 18
19 TAS5753MDEVM Stereo Device......................................................................................... 21
20 TAS5753MDEVM Mono Device.......................................................................................... 22
21 TAS5753MDEVM PPCMB and Power Supply Connection........................................................... 23

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List of Tables
1 Available Sample Rates for Each Digital Input .......................................................................... 6
2 Available Presets for Multiband AGL...................................................................................... 9
3 TAS5753MDEVM Bill of Materials ....................................................................................... 19
1 Overview
The TAS5753MD evaluation module showcases the latest TI digital input Class-D open-loop amplifiers.
The TAS5753MD is an I²S input Class-D amplifier with audio processing features and integrated
headphone/line driver.
The EVM is configured in Two-Device 2.1 mode with one stereo device using bridge tied load for left and
right channels and one mono device configured for mono applications, such as higher power full-range
speakers or subwoofers. The device operating in stereo mode has the headphone/line driver option
available via a 3.5-mm plug connector. The EVM is used in conjunction with the PurePath Console
Motherboard (PPCMB). The PVDD supply is input on the EVM daughter card, which passes it to the
PPCMB motherboard through the J4 connector. Regulators on the PPCMB create the 3.3-V power supply,
which is sent back to the DUT through the J4 connector. The EVM is controlled by PPC3 software.
Figure 1. TAS5753MD Evaluation Board

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1.1 Features
This EVM supports the following features:
• Control via USB port using TI's PPC3
• Two-Device 2.1 mode, one stereo device and one mono device, both with I²S input from PPCMB
• Analog, optical, coaxial, and USB audio inputs available through PPCMB
• Integrated heaphone/line driver amplifier
2 EVM Setup
Figure 2 illustrates the EVM setup.
Figure 2. Evaluation Module and PurePath Console Motherboard Connection
2.1 Requirements
The following are required to operate and test this EVM:
• TAS5753MDEVM board
•PurePath Console motherboard
• Banana cable, or bare wire lead pair for PVDD/GND connection via five-way binding posts.
• Speaker cable with JST VHR-2N connector
• 2 × 8-Ωspeakers for stereo test
• 1 × 4-Ωspeakers for mono test
• Power supply (8 V to 26.4 V)
• Audio Source (Analog, USB, Optical)
• Micro type-B USB cable
•PurePath Console 3.xx GUI running on a PC

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2.2 Software Setup
PurePath Console 3.xx is required to configure the EVM. Download the software from
www.ti.com/mysecuresoftware, and install it before connecting the device for the first time.
Prior authorization is required to download the software. Access http://www.ti.com/tool/purepathconsole
and click the Request button to start the approval process. TAS5753MD application for PurePath Console
should be requested from the TAS5753MDEVM tool folder.
For more information about PurePath Console 3, refer to the PPC3 User Manual and PPC3 Quick
Reference Guide found in www.ti.com/mysecuresoftware.
2.3 Hardware Setup
Use the following steps to setup the hardware:
• Connect the TAS5753MDEVM to the PPCMB.
• Connect the power supply to the EVM board and turn on the power. The 5-V and 3.3-V LEDs will
become illuminated.
• Connect the micro-USB cable from the PC to the controller board; the USB lock LED will become
illuminated.
• Connect an audio source to the PPCMB, this is not necessary if the source is USB audio.
• Connect the speakers to the outputs of the EVM.
3 Using the TAS5753MDEVM with PurePath Console 3
3.1 TAS5753MD Application Connection
The TAS5753MD application is available in PPC3 after correct installation and approval. Sign into PPC3
to gain access to the TAS5753MD application installer. After installing, the TAS5753MD application is
available.
Figure 3. TAS5753MD Application in PurePath Console 3
Verify that the EVM is properly connected to the application by looking in the lower left corner of the
TAS5753MD application. A green status circle indicates that the TAS5753MDEVM is properly connected
to the computer. The device programming is done automatically when opening the application. If the
status circle is not green, the EVM may be connected but it is likely not correctly programmed as the
TAS5753MDEVM. In this case, connection to the EVM must be done manually by clicking on the Connect
button located on the lower left corner of the window after opening the TAS5753MD application.
When opening the TAS5753MD application, a file window appears offering the option to load a previously
saved configuration file, start a new configuration or continue the last session.

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3.2 TAS5753MD Application Features
The Home window is displayed when the TAS5753MD application is initialized. Several evaluation and
integration options are available. TI recommends using the application walkthrough by clicking on the
question mark icon available next to the page name in all pages. The application walkthrough feature
provides guidance through various sections in the selected page and displays comments explaining the
sections of the page. Close the application walkthrough at any time by clicking on the ‘x’ mark at the top
right corner of the pop up. Navigate through the previous and next sections in the page by clicking on the
left or right arrows.
Figure 4. TAS5753MD Application Home Window
3.3 Hardware Checks
The following window verifies the correct connection of the evaluation module, checking if the hardware is
correctly configured to test the EVM.
Perform a system calibration before proceeding to the Tuning and Audio Processing window. If an attempt
to enter the Tuning and Audio Processing window is made before performing hardware checks, PPC3
prompts with a window requesting to perform the verification of the hardware. Only new sessions require a
hardware check, so this window will not appear when continuing from a previous session or loading a
previously saved one.

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Ensure that the PurePath Console motherboard and EVM are recognized as USB-AudioEVM, and that the
sampling frequency is set to 48 kHz. Otherwise, the hardware check fails and the EVM evaluation may not
be correct. This information is found under sound settings in the control panel of the host computer.
3.4 Audio I/O
This tool selects the desired audio input to test the board. USB, optical, coaxial, and line inputs are
supported by the motherboard. USB audio source is selected as default but there is an option to enable or
disable the audio source to the amplifier by clicking on Speaker out. The available sampling rates for each
digital input are shown in Table 1.
Table 1. Available Sample Rates for Each Digital Input
Input Sampling rates available
USB in 48 kHz
Optical In 48 kHz / 44.1 kHz
Coax In 48 kHz / 44.1 kHz
Although PPCMB operating range is up to 192 kHz, the available sample rates are limited to
theTAS5753MD.
The headphone output of the stereo amplifier can be turned on or off in the Audio I/O window. The source
for the headphone output of the evaluation module is the analog input of the PPCMB.
3.5 Tuning and Audio Processing
The main features of the amplifier audio processing are configured through this window. After opening the
Tuning and Audio Processing window, the devices in the EVM are configured with default settings. USB
audio is selected as the audio source by default. Configuration options include which device on the board
(either stereo or mono) is being configured, the audio source for the amplifiers, as well as the audio
processing features available in the device. The option to save the changes made during the audio tuning
using the snapshot feature of PPC3 is also available.

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Figure 5. TAS5753MDEVM Audio Processing Windows
Stereo/Mono device selection
Configure each device of the EVM individually by selecting between Stereo and Mono
on the upper right section of the Audio Processing window. The configuration of each
device is made with the same controls; the only difference is that when configuring the
mono device, the channel (left or right) driving the power stage is selected. Detailed
information is found in the Configuration section.
Configuration
Access the configuration menu by clicking in the gear icon next to the Stereo/Mono
selection button. In Stereo mode, only the option to reset the tuning done in the GUI
is offered, in mono mode, the user can select also if the left or right channel from the
digital audio processor drives the power stage of the amplifier. When performing the
Reset tuning function, the devices are configured with the default settings. By default,
both devices are configured with a master volume gain of –10 dB, multiband AGLs are
set to 0 dB while full band AGL is set to –1 dB. Stereo device equalizers are turned off,
but mono device has a default-configured 120-Hz low-pass filter for use in subwoofer
applications. The left channel of the mono device is driving the power stage by default.
Audio I/O shortcut
This section shows the audio source and sampling frequency that is used to generate
the I²S input for the TAS5753MD amplifiers. The user is redirected to the main Audio
I/O window after clicking this button.
Audio Player
The Audio Player is used to play audio tracks available in the PC and perform various
tuning operations. Clicking on the Audio Player launches a floating window, where
audio tracks are added or played.

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Tuning Snapshots
Tuning Snapshot stores all the values of the current setting. A maximum of 5
Snapshots can be stored. When clicking on Tuning Snapshots, the Tuning History
Navigator is opened. Tuning History Navigator saves the history of the tuning changes
with each node corresponding to a single tune setting changed from the previous
node. More information about Tuning History Navigator and Tuning Snapshots is found
in the PPC3 User Manual.
I²C Monitor
Use the I²C Monitor to execute direct read and write commands to the device and
view the I²C transactions happening as a result of device operation performed using
the PPC3 application. I²C Monitor has the same functionality of the Direct I²C tool
available in the Home window of the application. Access the I²C Monitor by clicking
the I²C Monitor icon in the bottom bar, in any of the pages.
Equalizer
The Equalizer window allows the configuration and setting of the different Biquads available in the audio
processing of the device. By default, all the equalizers are turned off in the stereo device, while for the
mono device, a 120-Hz low pass filter is implemented by default with EQ1.
Figure 6. Equalizer Window
Different equalizer types can be implemented and all the changes to them are reflected in the different
plots. Composite plot (red) reflects the sum response of all the equalizers configured. The details of
each equalizer setting (as filter type, frequency, gain, and phase) is found in the bottom of the chart
section. Each equalizer is turned on or off independently and offer the option of reading or writing the
BQ coefficients directly by clicking in the turn ( ) icon. The setting of the equalizers is ganged for left
and right channels by default, but can be configured independently by the user when de-selecting
“Ganged” box. Phase,Group Delay,Impulse Response, and pole/zero charts are available as well for
the analysis of the equalizer response.

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Multiband AGL and Full-Band AGL
The TAS5753MD features three multiband AGLs, as well as a full-band AGL. The multiband AGL is
used as a three-band crossover, having an independent custom configuration for low, high, and mid
frequency bands.
The multiband AGL and full-band AGL also offer the option to use preset configurations based on
output power, available for the use of standard power supplies and loads. These presets offer a good
starting point towards the full configuration of the end system.
Table 2. Available Presets for Multiband AGL
TAS5753MD Presets
15 W with 12-V PVDD, 4-Ωload
10 W with 12-V PVDD, 4-Ωload
20 W with 24-V PVDD, 8-Ωload
15 W with 24-V PVDD, 8-Ωload
15 W with 19.6-V PVDD, 6-Ωload
10 W with 19.6-V PVDD, 6-Ωload
The filters used for the multiband AGL crossover are configured according to the specific need. By
default, the three-band crossover frequencies are set to 300 Hz and 3 kHz, using second-order
Linkwitz-Riley filters. This filter type was chosen so the total sum of the three-band signals has a flat
response without having to calculate individual cross-over frequencies for unity summation. The
crossover frequencies were selected so they are separated far enough in the frequency range from
each other to avoid any dip caused by the filter sum response. For the mid-band mixer, the coefficients
range is different and features negative values. This is done because when using second order filters to
form a band-pass filter; the phase of the signal is inverted, causing an undesired frequency response
when summing all the signals. This phase inversion is corrected by using negative coefficients for the
mid-band mixer.
Figure 7. Multiband AGL – Three-Band Crossover

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The AGL crossover configuration has two operating modes that can
be selected on the top of the main plot:
In basic mode, the crossover frequencies are ganged for left and
right channels, and the filters are configured so cutoff frequencies for
lowpass, bandpass, and highpass filter are matched.
In advanced mode, the user can modify these parameters
individually as well as have a different configuration for left and right
channels for the stereo device.
An Input/Output chart is available to easily configure the threshold
levels for each band. Drag and select each threshold and fine tune
the desired threshold level by controlling the levels in the lower part
of the window. Modify the Softening parameter to configure the
sharpness of the compression knee of the AGL.
Attack and release parameters are available for AGL tuning:
Attack Rate: This parameter sets the rate of the attack over the
output signal when it is greater than the desired threshold level. This
parameter acts fast enough to avoid apparent clipping before
engaging.
Release Rate: When the threshold is raised, this parameter reflects
the release rate of the compressed signal.