National Semiconductor TAS2557 User manual

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TAS2557 Evaluation Module
User's Guide
SLOU461–November 2016
TAS2557 Evaluation Module
This user’s guide describes the characteristics, operation, and use of the TAS2557 Evaluation Module
(EVM). A complete schematic diagram, printed-circuit board layouts, and bill of materials are included in
this document.
NOTE: Recipient agrees to not knowingly export or re-export, directly or indirectly, any product or
technical data (as defined by the U.S., EU, and other Export Administration Regulations)
including software, or any controlled product restricted by other applicable national
regulations, received from Disclosing party under this Agreement, or any direct product of
such technology, to any destination to which such export or re-export is restricted or
prohibited by U.S. or other applicable laws, without obtaining prior authorization from U.S.
Department of Commerce and other competent Government authorities to the extent
required by those laws. This provision shall survive termination or expiration of this
Agreement. According to our best knowledge of the state and end-use of this product or
technology, and in compliance with the export control regulations of dual-use goods in force
in the origin and exporting countries, this technology is classified as follows:
• US ECCN: 3E991
• EU ECCN: EAR99
This technology may require export or re-export license for shipping it in compliance with the
applicable regulations of certain countries.

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TAS2557 Evaluation Module
Contents
1 Description.................................................................................................................... 3
2 Specifications................................................................................................................. 3
3 Software....................................................................................................................... 3
4 Mono Setup................................................................................................................... 4
5 Dual Mono .................................................................................................................... 7
6 Digital Audio Interfaces ..................................................................................................... 8
7 Hardware Documentation ................................................................................................. 10
List of Figures
1 TAS2557 EVM Mono Setup................................................................................................ 4
2 Setting Default Playback Device........................................................................................... 5
3 3-Pin Jumper................................................................................................................. 6
4 TAS2557EVM Dual Mono Setup .......................................................................................... 7
5 USB Audio Selection........................................................................................................ 9
6 Direct (AP/PSIA) Audio Selection........................................................................................ 10
7 TAS2557EVM USB Block................................................................................................. 11
8 TAS2557EVM Input Muxes and Translators ........................................................................... 12
9 TAS2557EVM Output Muxes and Translators ......................................................................... 13
10 TAS2557EVM Channel 1 Schematic.................................................................................... 14
11 TAS2557EVM Channel 2 Schematic.................................................................................... 15
12 TAS2557EVM Power Supply............................................................................................. 16
13 Top Overlay................................................................................................................. 17
14 Top Solder Mask ........................................................................................................... 17
15 Top Layer ................................................................................................................... 18
16 Copper Layer 2............................................................................................................. 18
17 Copper Layer 3............................................................................................................. 19
18 Copper Layer 4............................................................................................................. 19
19 Copper Layer 5............................................................................................................. 20
20 Bottom Layer................................................................................................................ 20
21 Bottom Solder Mask ....................................................................................................... 21
22 Drill Drawing ................................................................................................................ 21
23 Board Dimensions.......................................................................................................... 22
List of Tables
1 EVM Specifications.......................................................................................................... 3
2 Default Jumper Settings .................................................................................................... 5
3 TAS2557EVM Bill of Materials ........................................................................................... 23
Trademarks
PurePath is a trademark of Texas Instruments.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
All other trademarks are the property of their respective owners.

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1 Description
The TAS2557 device is an amplifier with integrated boost converter and programmable digital signal
processor. The output amplifier is a Class-D device that can be driven to higher output levels with the on-
chip Class-H boost. The on-chip voltage and current sense, together with TI’s Smart Amp algorithm,
protect the speaker against overheating and excessive excursion.
The TAS2557 EVM supports evaluation and development with the TAS2557 device through the following
interfaces:
• USB interface
– TAS2557 control through PurePath™ Console 3 (PPC3) GUI, USB-HID
– USB-class audio device, compatible with Microsoft®Windows®7+
• Digital audio AP and PSIA interface through 100-mil headers
• TI Learning Board 2 for speaker characterization
• SPI interface for TAS2557 control
• I2C interface for TAS2557 control
2 Specifications
Table 1. EVM Specifications
SOURCE REQUIREMENT
Amplifier Power Supply (VBAT) 2.9 to 5.5 V
Analog Supply (AVDD) 1.65 to 1.95 V
Digital Supply (DVDD) 1.65 to 1.95 V
EVM Power Supply 5.0 V
IO Power Supply (IOVDD) 1.62 to 3.6 V
Output Power 5.7 W
USB, USB Class-Audio Micro-USB B
3 Software
The TAS2557 EVM requires PurePath Console 3 with the TAS2557 plug-in.
NOTE: The TAS2557 device needs to be configured using this software. It will not function without
this configuration.
Please refer to the Smart Amp Tuning Guide which can be found in the project folder at
MySecureSoftware for detailed information about this software and how to configure the TAS2559 device
for Smart Amp Speaker Protection.

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4 Mono Setup
1. Install PurePath Console 3 with the TAS2557EVM plug-in.
2. Connect a speaker to J8 on the EVM.
3. Attach a 5.0 V/ 2.5 A power supply to connector J29 (inner = 5V, outer = GND).
4. Connect the EVM to a Windows 7+ PC with a micro-USB cable (J23). It will enumerate as a USB-
AudioEVM device (sound card).
Figure 1. TAS2557 EVM Mono Setup

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5. Verify that the EVM is the default playback device by opening the sound dialog from the Windows
Control Panel as shown in Figure 2.
Figure 2. Setting Default Playback Device
6. Check if the sampling rate matches the Windows setting by opening the advanced tab in the properties
menu. The EVM firmware enumerates as a USB-AudioEVM that supports 48 kHz sampling rate by
default. This setting must match the EVM at 2-channel, 16-bit, 48000 Hz (CD Quality).
Table 2. Default Jumper Settings
JUMPER SETTING DESCRIPTION CHANNEL
J2 Insert VBAT 5V
J3 Remove DOUT 1
J4 Insert DVDD 1.8V 1
J6 Insert AVDD 1.8V 1
J7 Insert IOVDD Setting from J30 1
J9 Remove SCL / SS 1
J10 Remove SDA / MOSI 1
J11 Insert Address Select1 1
J12 Insert Address Select0 1
J13 Insert SPI Select 1
J14 Remove IRQ 1
J15 Pin 1-2 SDIN = on-board 1
J16 Pin 1-2 WCLK = on-board 1
J17 Pin 1-2 BCLK = on-board 1
J18 Pin 1-2 MCLK = on-board 1
J19 Pin 1-2 SCL = on-board 1
J20 Pin 1-2 SDA = on-board 1
J22 Remove Reset 1

1 2 3
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Table 2. Default Jumper Settings (continued)
JUMPER SETTING DESCRIPTION CHANNEL
J24 Insert WP = 1, write protect EEPROM
J25 Remove DOUT 2
J26 Insert P1 = 0, select USB for on-board digital
audio
J27 Insert P0 = 0, select USB for on-board digital
audio
J30 Pin 1-2 IOVDD Select = 3.3 V 2
J32 Pin 1-2 SDIN = on-board 2
J33 Pin 1-2 WCLK = on-board 2
J34 Pin 1-2 BCLK = on-board 2
J35 Pin 1-2 MCLK = on-board 2
J36 Pin 1-2 SCL = on-board 2
J37 Pin 1-2 SDA = on-board 2
J38 Insert DVDD 1.8V 2
J39 Insert AVDD 1.8V 2
J41 Insert IOVDD Setting from J30 2
J42 Remove Reset 2
J43 Remove SCL / SS 2
J45 Remove SDA / MOSI 2
J46 Insert Address Select1 2
J47 Remove Address Select0 2
J48 Insert SPI Select 2
J49 Remove IRQ 2
J51 Insert ICC =1, inter-chip communication
J52 Insert ICC =1, inter-chip communication
J53 Insert ICC =1, inter-chip communication
Figure 3. 3-Pin Jumper
Please refer to Figure 5 for default jumper settings.

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5 Dual Mono
Dual Mono mode is a stereo configuration where each device independently processes the data stream it
has been assigned for Smart Amp tuning. Each device is capable of processing left, right, or both
channels.
1. Install PurePath Console 3 with the TAS2557EVM plug-in.
2. Connect speakers to both J44 and J8 on the EVM.
3. Attach a 5.0 V/ 5.0 A power supply to connector J29 (inner = 5V, outer = GND).
4. Connect the EVM to a Windows 7+ PC with a micro-USB cable (J23). It will enumerate as a USB-
AudioEVM device (sound card).
Figure 4. TAS2557EVM Dual Mono Setup
5. Select Dual Mono configuration in PPC3 and proceed with characterization per the PPC3 User’s guide.
6. Play the test tone as shown in Figure 2.

Digital Audio Interfaces www.ti.com
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6 Digital Audio Interfaces
The various digital audio interfaces on the TAS2557EVM can be selected through hardware settings and
software settings. Several headers close to the TAS2557 device allow access to the following digital audio
signals:
• J3: Data Out (DOUT) from the TAS2557 (For example, current and voltage sense data.)
• J15: Data In (DIN) to the TAS2557
• J16: Word Clock or Frame Sync (WCLK)
• J17: Bit Clock (BCLK)
• J18: Master Clock (MCLK) (This is optional if TAS2557 PLL is not used.)
J3 has two pins:
• Digital data (for example, I and V sense data) from the TAS2557 device
• Ground
J15, J16, J17, and J18 have three pins:
• Digital audio signals from the EVM
• Digital audio signals to the TAS2557
• Ground
A jumper inserted in position 1-2 connects the TAS2557 to the digital audio signals from the board (for
example, USB or Learning Board 2). Replacing the jumper with a connector from an external source
connects the TAS2557 to the external source (for example, AP or PSIA).
The selection between the two on-board digital audio sources (USB or Learning Board 2) is controlled by:
(a) Hardware: J26,J27
• J26 = inserted, J27 = inserted; Selects USB
• J26 = inserted, J27 = removed; Selects Learning Board 2
(b) Software: The PPC3 GUI controls the digital audio routing during speaker characterization. This has
priority over the hardware settings from point a.
The secondary digital audio interface from the TAS2557 device is directly available through J5.

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6.1 Digital Audio Interface Selection
6.1.1 USB
The TAS2557EVM contains a microcontroller (TAS1020B) that acts as a USB HID and USB-class audio
interface. To select USB, insert both J26 and J27 and insert J15, J16, J17, and J18 in the 1-2 position.
This is shown in Figure 5.
Figure 5. USB Audio Selection

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6.1.2 Direct (AP/PSIA)
Remove the jumpers from J15, J16, J17 and J18 for Channel 1 (or J32, J33, J34, and J35 for Channel 2)
and connect the external digital audio source (for example AP or PSIA) to pin 2 of each head. Pin 3
provides a convenient ground connection. This is shown in Figure 6.
Figure 6. Direct (AP/PSIA) Audio Selection
7 Hardware Documentation