Texas Instruments TLV320AIC34EVM-K User manual

User's Guide
SLAU232–December 2007
TLV320AIC34EVM-K
This user's guide describes the characteristics, operation, and use of the TLV320AIC34EVM-K. This
evaluation module (EVM) allows the user to evaluate the TLV320AIC34 audio codec. The TLV320AIC34 is
a complete 4-channel audio codec with several inputs and outputs, extensive audio routing, mixing and
effects capabilities. A complete circuit description, schematic diagram and bill of materials are also
included. Note that the TLV320AIC34 only uses the I2C bus for register control. Any references to the SPI
control bus in this document is due to the presence of this interface on the USB-MODEVM motherboard.
The following related documents are available through the Texas Instruments web site at www.ti.com.
EVM-Compatible Device Data Sheets
Device Literature Number
TLV320AIC34 SLAS538
TAS1020B SLES025
REG1117-3.3 SBVS001
TPS767D318 SLVS209
SN74LVC125A SCAS290
SN74LVC1G125 SCES223
SN74LVC1G07 SCES296
Contents
1 EVM Overview ............................................................................................................... 3
2 EVM Description and Basics............................................................................................... 3
3 TLV320AIC34EVM-K Setup and Installation............................................................................. 8
4 TLV320AIC34EVM Software.............................................................................................. 10
Appendix A EVM Connector Descriptions ................................................................................... 36
Appendix B TLV320AIC34EVM Schematic .................................................................................. 40
Appendix C TLV320AIC34EVM Layout Views .............................................................................. 41
Appendix D TLV320AIC34EVM Bill of Materials ............................................................................ 44
Appendix E USB-MODEVM Schematic ...................................................................................... 45
Appendix F USB-MODEVM Bill of Materials ................................................................................ 46
Appendix G USB-MODEVM Protocol ......................................................................................... 48
List of Figures
1 TLV320AIC34EVM-K Block Diagram ..................................................................................... 4
2 Default Software Screen ................................................................................................... 9
3I
2C Address Selection Window .......................................................................................... 10
4 Default Configuration Tab................................................................................................. 12
5 Audio Input Tab ............................................................................................................ 13
6 Audio Interface Tab ....................................................................................................... 15
7 Clocks Tab ................................................................................................................. 16
8GPIOTab
................................................................................................................... 18
9 AGC Tab .................................................................................................................... 20
10 Left AGC Settings.......................................................................................................... 21
I2S, I2C are trademarks of Koninklijke Philips Electronics N.V.
Windows is a trademark of Microsoft Corporation.
LabView is a trademark of National Instruments.
All other trademarks are the property of their respective owners.
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11 Advanced.................................................................................................................... 21
12 Filters Tab .................................................................................................................. 22
13 ADC High Pass Filters .................................................................................................... 23
14 ADC Highpass Filter Settings ............................................................................................ 23
15 DAC Filters.................................................................................................................. 24
16 De-emphasis Filters........................................................................................................ 24
17 Enabling Filters ............................................................................................................ 25
18 Shelf Filters ................................................................................................................. 25
19 EQ Filters ................................................................................................................... 26
20 Analog Simulation Filters ................................................................................................. 26
21 Preset Filters ............................................................................................................... 27
22 User Filters ................................................................................................................. 27
23 3D Effect Settings ......................................................................................................... 28
24 Output Stage Configuration Tab ......................................................................................... 29
25 DAC/Line Outputs Tab .................................................................................................... 31
26 High Power Outputs Tab ................................................................................................. 33
27 Command Line Interface Tab ............................................................................................ 34
28 File Menu ................................................................................................................... 35
C-1 Assembly layer ............................................................................................................. 41
C-2 Top Layer.................................................................................................................... 41
C-3 Layer 3....................................................................................................................... 42
C-4 Layer 4....................................................................................................................... 42
C-5 Bottom Layer................................................................................................................ 43
List of Tables
1 USB-MODEVM SW2 Settings ............................................................................................. 5
2 List of Standalone Jumpers ................................................................................................ 5
3 List of Jumpers Connected to J17A (Digital Interface Signals)........................................................ 6
A-1 Block B Analog Interface Pin Out ........................................................................................ 36
A-2 Block A Analog Input/Output Connectors ............................................................................... 37
A-3 Block A and Block B Digital Interface Pin Out.......................................................................... 38
A-4 Power Supply Pin Out ..................................................................................................... 39
D.1 TLV320AIC34EVM Bill of Materials...................................................................................... 44
F-1 USB-MODEVM Bill of Materials.......................................................................................... 46
G-1 USB Control Endpoint HIDSETREPORT Request .................................................................... 48
G-2 Data Packet Configuration ................................................................................................ 48
G-3 GPIO Pin Assignments.................................................................................................... 51
2TLV320AIC34EVM-K SLAU232–December 2007
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1 EVM Overview
1.1 Features
1.2 Introduction
2 EVM Description and Basics
2.1 TLV320AIC34EVM-K Block Diagram
EVM Overview
•Full-featured evaluation board for the TLV320AIC34 4-channel audio codec.
•Modular design for use with a variety of digital signal processor (DSP) and microcontroller interface
boards.
•USB connection to PC provides power, control, and streaming audio data for easy evaluation.
•On-board microphone for ADC evaluation
•Connection points for external control and digital audio signals for quick connection to other
circuits/input devices.
The TLV320AIC34EVM-K is a complete evaluation kit, which includes a universal serial bus (USB)-based
motherboard and evaluation software for use with a personal computer running the Microsoft Windows™
operating system (Win2000 or XP).
The TLV320AIC34EVM is in Texas Instruments' modular EVM form factor, which allows direct evaluation
of the device performance and operating characteristics, and eases software development and system
prototyping. This EVM is compatible with the 5-6K Interface Evaluation Module (SLAU104) and the
HPA-MCUINTERFACE (SLAU106) from Texas Instruments and additional third-party boards which
supports the TI Modular EVM format.
The TLV320AIC34EVM-K is a complete evaluation/demonstration kit, which includes a USB-based
motherboard called the USB-MODEVM Interface board and evaluation software for use with a personal
computer running the Microsoft Windows operating systems.
The USB connection from the PC provides power, control, and streaming audio data to the EVM for
reduced setup and configuration. The EVM also allows external control signals, audio data, and power for
advanced operation, which allows prototyping and connection to the rest of the evaluation/development
system.
This section provides information on the analog input and output, digital control, power and general
connection of the TLV320AIC34EVM.
The TLV320AIC34EVM-K consists of two separate circuit boards, the USB-MODEVM and the
TLV320AIC34EVM. The USB-MODEVM is built around a TAS1020B streaming audio USB controller with
an 8051-based core.
The simple diagram below (Figure 1) shows the how the TLV320AIC34EVM is connected to the
USB-MODEVM. The USB-MODEVM Interface board is intended to be used in USB mode, where control
of the installed EVM is accomplished using the onboard USB controller device. Provision is made,
however, for driving all the data buses (I2C, I2S, etc.) externally. The source of these signals is controlled
by SW2 on the USB-MODEVM. Refer to Table 1 for details on the switch settings.
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2.1.1 USB-MODEVM Interface Board
EVM Position 2
EVM Position 1
TLV320AIC34EVM
Control Interface
TLV320AIC34
TAS1020B
USB 8051
Microcontroller
USB
IC
2
IS
2
Audio Interface
USB-MODEVM
EVM Description and Basics
The simple diagram shown in Figure 1 shows only the basic features of the USB-MODEVM Interface
board.
When connecting the TLV320AIC34EVM to the USB-MODEVM care must be used to avoid bending the
connecting pins. The two boards can only be connected in one way. It is suggested to first align with the
10-pin connectors (J15B on the TLV320AIC34EVM and J18A on the USB-MODEVM) and then gently
push all the connectors together until the boards are seated.
In the factory configuration, the board is ready to use with the TLV320AIC34EVM. To view all the functions
and configuration options available on the USB-MODEVM board, see the USB-MODEVM Interface Board
schematic in Appendix.
Figure 1. TLV320AIC34EVM-K Block Diagram
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2.2 Default Configuration and Connections
2.2.1 USB-MODEVM
2.2.2 TLV320AIC34EVM Jumper Locations
EVM Description and Basics
Table 1 provides a list of the SW2 settings on the USB-MODEVM. For use with the TLV320AIC34EVM,
SW-2 positions 1 through 7 should be set to ON (LO), while SW-2.8 should be set to OFF (HI).
Table 1. USB-MODEVM SW2 Settings
SW-2 Switch Number Label Switch Description
1 A0 USB-MODEVM EEPROM I2C Address A0
ON: A0 = 0
OFF: A0 = 1
2 A1 USB-MODEVM EEPROM I2C Address A1
ON: A1 = 0
OFF: A1 = 1
3 A2 USB-MODEVM EEPROM I2C Address A2
ON: A2 = 0
OFF: A2 = 1
4 USB I2SI
2S Bus Source Selection
ON: I2S Bus connects to TAS1020
OFF: I2S Bus connects to USB-MODEVM J14
5 USB MCK I2S Bus MCLK Source Selection
ON: MCLK connects to TAS1020
OFF: MCLK connects to USB-MODEVM J14
6 USB SPI SPI Bus Source Selection
ON: SPI Bus connects to TAS1020
OFF: SPI Bus connects to USB-MODEVM J15
7 USB RST RST Source Selection
ON: EVM Reset Signal comes from TAS1020
OFF: EVM Reset Signal comes from USB-MODEVM J15
8 EXT MCK External MCLK Selection
ON: MCLK Signal is provided from USB-MODEVM J10
OFF: MCLK Signal comes from either selection of SW2-5
Table 2 and Table 3 provide a list of jumpers found on the EVM and their factory default conditions.
Table 2. List of Standalone Jumpers
Default
Jumper Position Jumper Description
JMP1 2-3 When connecting 2-3, mic bias comes from the MICBIAS pin on the device; when connecting 1-2, mic bias is supplied from the
power supply through a resistor, which the user must install.
JMP2 Installed Connects on-board Mic to Left Microphone Input.
JMP3 Installed Connects on-board Mic to Right Microphone Input.
JMP4 Installed Provides a means of measuring IOVDD current.
JMP5 soldered DRVDD power.
JMP6 soldered DVDD power.
JMP7 soldered DRVDD power.
JMP8 soldered AVDD_DAC power.
JMP9 Installed Connects Analog and Digital Grounds.
JMP10 Open When installed, shorts across the output capacitor on HPLOUT_A; remove this jumper if using AC-coupled output drive.
JMP11 Open When installed, shorts across the output capacitor on HPLCOM_A; remove this jumper if using AC-coupled output drive.
JMP12 Open When installed, shorts across the output capacitor on HPROUT_A; remove this jumper if using AC-coupled output drive.
JMP13 Open When installed, shorts across the output capacitor on HPLOUT_B; remove this jumper if using AC-coupled output drive.
JMP14 Open When installed, shorts across the output capacitor on HPLCOM_B; remove this jumper if using AC-coupled output drive.
JMP15 Open When installed, shorts across the output capacitor on HPROUT_B; remove this jumper if using AC-coupled output drive.
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2.3 Block A Analog Signal Connections
2.3.1 Block A Analog Inputs
2.3.2 Block A Analog Output
2.4 Block A Digital Signal Connections
2.4.1 Block A Digital Inputs and Outputs
EVM Description and Basics
Table 2. List of Standalone Jumpers (continued)
Default
Jumper Position Jumper Description
JMP16 Installed When installed, shorts HPLCOM_A and HPRCOM_A. Use only if these signals are set to constant VCM and external feedback.
Also, switch SW1 must be in the "Capless" position when installed.
JMP17 Open When installed, shorts across the output capacitor on HPRCOM_A; remove this jumper if using AC-coupled output drive.
JMP18 Open Selects on-board EEPROM as Firmware Source. Note that for this EVM the Firmware Source EEPROM is on the USB-MODEVM.
JMP19 Installed When installed, allows the USB-MODEVM to hardware reset the device under user control
JMP20 Installed When installed, shorts HPLCOM_B and HPRCOM_B. Use only if these signals are set to constant VCM and external feedback.
JMP21 Open When installed, shorts across the output capacitor on HPRCOM_B; remove this jumper if using AC-coupled output drive.
Table 3. List of Jumpers Connected to J17A (Digital Interface Signals)
J17A
Default
Signals Position Jumper Description
BCLK_A pin 3 - pin 5 Connects Block A BCLK_A and Block B BLCK_B together for ease of evaluation. When Block A and Block B use different digital
and clocks/data this jumper MUST be removed.
BCLK_B
WCLK_A pin 7 - pin 9 Connects Block A WCLK_A and Block B WLCK_B together for ease of evaluation. When Block A and Block B use different
and digital clocks/data this jumper MUST be removed.
WCLK_B
DIN_A pin 10 - pin Connects Block A DIN_A and Block B DIN_B together for ease of evaluation. When Block A and Block B use different digital
and 11 clocks/data this jumper MUST be removed.
DIN_B
DOUT_A open Connects Block A DOUT_A and Block B DOUT_B together for ease of evaluation. When Block A and Block B use different
and digital clocks/data this jumper MUST be removed. Also if both Block A and Block B are used together this jumper must be
DOUT_B removed due to potential conflict on the DOUT signals.
MCLK_A pin 17 - pin Connects Block A MCLK_A and Block B MCLK_B together for ease of evaluation. When Block A and Block B use different
and 19 digital clocks/data this jumper MUST be removed..
MCLK_B
The Block A analog inputs to the EVM can be connected through the analog headers J1, J2, J3, J4, J5,
and J6 around the edge of the board. The connection details of each header/connector can be found in
Table A-2.
The Block A analog outputs to the EVM can be connected through J7, J8, J9, J11,and J12 at the edges of
the board. The connection details can be found in Table A-2.
The digital inputs and outputs of the EVM can be monitored through J16 and J17. If external signals need
to be connected to the EVM, digital inputs should be connected via J14 and J15 on the USB-MODEVM
and the SW2 switch should be changed accordingly (see Section 2.2.1). The connector details are
available in Section A.2.
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2.4.2 Block A Digital Controls
2.5 Block B Analog Signal Connections
2.5.1 Block B Analog Inputs
2.5.2 Block B Analog Output
2.6 Block B Digital Signal Connections
2.6.1 Block B Digital Inputs and Outputs
2.6.2 Block B Digital Controls
2.7 Power Connections
EVM Description and Basics
The digital control signals can be applied directly to J16 and J17 (top or bottom side). The modular
TLV320AIC34EVM can also be connected directly to a DSP interface board, such as the
5-6KINTERFACE or HPA-MCUINTERFACE, or to the USB-MODEVM Interface board (included in this
EVM kit).
The Block B analog inputs to the EVM can be applied directly to J13 (top or bottom side). The connection
details of each header/connector can be found in Table A-1.
The Block B analog outputs to the EVM can be connected through J13 and J14 (top or bottom). The
connection details can be found in Table A-1.
The digital inputs and outputs of the EVM can be monitored through J16 and J17. If external signals need
to be connected to the EVM, digital inputs should be connected via J14 and J15 on the USB-MODEVM
and the SW2 switch should be changed accordingly (see Section 2.2.1). The connector details are
available in Section A.2.
The digital control signals can be applied directly to J16 and J17 (top or bottom side). The modular
TLV320AIC34EVM can also be connected directly to a DSP interface board, such as the
5-6KINTERFACE or HPA-MCUINTERFACE, or to the USB-MODEVM Interface board (included in this
EVM kit).
The TLV320AIC34 can be powered independently when being used in stand-alone operation or by the
USB-MODEVM when it is plugged onto the motherboard.
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2.7.1 Stand-Alone Operation
2.7.2 USB-MODEVM Operation
3 TLV320AIC34EVM-K Setup and Installation
3.1 Software Installation
TLV320AIC34EVM-K Setup and Installation
When used as a stand-alone , power is applied to J15 directly, making sure to reference the supplies to
the appropriate grounds on that connector.
CAUTION
Before applying power to the EVM you must verify that all power supplies are
within the safe operating limits as indicated in the TLV320AIC34 data sheet.
J15 provides connection to the common power bus for the TLV320AIC34EVM. Power is supplied on the
pins listed in Table A-4.
The TLV320AIC34EVM-K motherboard (the USB-MODEVM Interface board) supplies power to J15 of the
TLV320AIC34EVM. Power for the motherboard is supplied either through its USB connection or via
terminal blocks on that board.
The USB-MODEVM Interface board can be powered from several different sources:
•USB
•6Vdc-10Vdc AC/DC external wall supply (not included)
•Lab power supply
When powered from the USB connection, JMP6 should have a shunt from pins 1–2 (this is the default
factory configuration). When powered from 6V-10Vdc, either through the J8 terminal block or J9 barrel
jack, JMP6 should have a shunt installed on pins 2–3. If power is applied in any of these ways, onboard
regulators generate the required supply voltages and no further power supplies are necessary.
If lab supplies are used to provide the individual voltages required by the USB-MODEVM Interface, JMP6
should have no shunt installed. Voltages are then applied to J2 (+5VA), J3 (+5VD), J4 (+1.8VD), and J5
(+3.3VD). The +1.8VD and +3.3VD can also be generated on the board by the onboard regulators from
the +5VD supply; to enable this configuration, the switches on SW1 need to be set to enable the
regulators by placing them in the ON position (lower position, looking at the board with text reading
right-side up). If +1.8VD and +3.3VD are supplied externally, disable the onboard regulators by placing
SW1 switches in the OFF position.
Each power supply voltage has an LED (D1-D7) that lights when the power supplies are active.
The following section provides information on using the TLV320AIC34EVM-K, including set up, program
installation, and program usage.
Note: If using the EVM in stand-alone mode, the software should be installed per below, but the
hardware configuration may be different.
1. Locate installation file on the CD-ROM include with the EVM or download the latest version of the
software located on the AIC34 Product Page.
2. Unzip the installation file by clicking on the self-extracting zip file.
3. Install the EVM software by double-clicking the Setup executable and follow the directions. The user
may be prompted to restart their computer.
This should install all the TLV320AIC34 software and required drivers onto the PC.
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3.2 EVM Connections
TLV320AIC34EVM-K Setup and Installation
1. Ensure that the TLV320AIC34EVM is installed on the USB-MODEVM Interface board, aligning J13,
J14, J15, J16, J17 with the corresponding connectors on the USB-MODEVM.
2. Verify that the jumpers and switches are in their default conditions.
3. Attach a USB cable from the PC to the USB-MODEVM Interface board. The default configuration will
provide power, control signals, and streaming audio via the USB interface from the PC. On the
USB-MODEVM, LEDs D3-6 should light to indicate the power is being supplied from the USB.
4. For the first connection, the PC should recognize new hardware and begin an initialization process.
The user may be prompted to identify the location of the drivers or allow the PC to automatically
search for them. Allow the automatic detection option.
5. Once the PC confirms that the hardware is operational, D2 on the USB-MODEVM should light to
indicate that the firmware has been loaded and the EVM is ready for use. If the LED is not lighted,
verify that the drivers were installed and trying to unplug and restart at Step 3.
After the TLV320AIC34EVM-K software installation (described in Section 3.2) is complete, evaluation and
development using the target TLV320AIC34 can begin.
The TLV320AIC34EVM software can now be launched. The user should see an initial screen that looks
similar to Figure 2.
Figure 2. Default Software Screen
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4 TLV320AIC34EVM Software
4.1 I2C Address Selection
TLV320AIC34EVM Software
The following section discusses the details and operation of the EVM software.
Note: For configuration of the codec, the TLV320AIC34 block diagram located in the TLV320AIC34
data sheet is a good reference to help determine the signal routing.
When the software is run, a window appears which allows for selecting the I2C address of the
TLV320AIC34. This window (see Figure 3) has two controls for setting the state of ADDR_A and
ADDR_B. To allow proper communication with the EVM, these should match the settings of SW2 located
on the EVM (Table 2). When ADDR_A and ADDR_B are adjusted, the correct device address for Block A
and Block B will be shown. Note that the actual I2C address shown and the address for the software may
be different. This is done for programming reasons and the correct address should be used for system
development.
Figure 3. I2C Address Selection Window
Note: For operation of the EVM in the default state, no changes are required on this panel. The
default setting for the GUI software and the default setting for the EVM hardware are
configured so that Block A address is 0x30 and Block B address is 0x32 as shown. This
corresponds to SW2 on the TLV320AIC34EVM being in position LO-LO.
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4.2 Front Page Indicators and Functions
TLV320AIC34EVM Software
Figure 2 illustrates the main screen of the EVM software. The indicators and buttons located above the
tabbed section of the front page are visible regardless of which tab is currently being selected.
At the top left of the screen is an Block Select control. This control allows the user to select either Block
A or Block B as the target for the GUI controls. When the Block A indicator is green the register writes use
the I2C address for Block A. Likewise, When the Block B indicator is green the register writes use the I2C
address for Block B.
To the right of the Block Select control is a group box called Firmware . This box indicates where the
firmware being used is operating from—in this release, the firmware is on the USB-MODEVM, so the user
should see USB-MODEVM in the box labeled Located On:. The version of the firmware appears in the
Version box below this.
To the right, the next group box contains controls for resetting the TLV320AIC34EVM. A software reset
can be done by writing to a register in the TLV320AIC34EVM, and this is accomplished by pushing the
button labeled Software Reset. The TLV320AIC34EVM also may be reset by toggling a pin on the
TLV320AIC34EVM, which is done by pushing the Hardware Reset button. JMP19 on the EVM is installed
to allow the reset to reach the TLV320AIC34.
CAUTION
The GUI software does NOT keep track of register settings when toggling
between Block A and Block B. When using both Block A and Block B register
updates it is recommended to either use I2C scripts for both blocks or use GUI
controls for one block and I2C scripts for the other block. Toggling between
Block A and Block B is not recommended.
Below the Firmware box, the Device Connected LED should be green when the EVM is connected. If the
indicator is red, the EVM is not properly connected to the PC. Disconnect the EVM and verify that the
drivers were correctly installed, then reconnect and try restarting the software.
One the upper right portion of the screen, several indicators are located which provide the status of
various portions of the TLV320AIC34. These indicators are activated by pressing the Indicator Updates
button below the Device Connected LED. These indicators, as well as the other indicators on this panel,
are updated only when the software's front panel is inactive, once every 20ms.
The ADC Overflow and DAC Overflow indicators light when the overflow flags are set in the
TLV320AIC34. Below these indicators are the AGC Noise Threshold Exceeded indicators that show
when the AGC noise threshold is exceeded. To the far right of the screen, the Short Circuit Detect
indicators show when a short-circuit condition is detected, if this feature has been enabled. Below the
short-circuit indicators, the AGC Gain Applied indicators use a bar graph to show the amount of gain
which has been applied by the AGC, and indicators that light when the AGC is saturated.
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4.3 Default Configuration (Presets) Tab
TLV320AIC34EVM Software
The Default Configuration Tab Figure 4 provides several different preset configurations of the codec. The
Preset Configurations buttons allow the user to choose from the provided defaults. When the selection is
made, the Preset Configuration Description are shows a summary of the codec setup associated with
the choice made. If the choice is acceptable, the Load button can be pressed and the preset configuration
will be loaded into the codec. The user can change to the Command Line Interface Tab (see Figure 27)
to view the actual settings that were programmed into the codec.
Figure 4. Default Configuration Tab
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4.4 Audio Input/ADC Tab
TLV320AIC34EVM Software
Figure 5. Audio Input Tab
The Audio Input/ADC Tab allows control of the analog input mixer and the ADC. The controls are
displayed to look similar to an audio mixing console (see Figure 5). Each analog input channel has a
vertical strip that corresponds to that channel. By default, all inputs are muted when the TLV320AIC34 is
powered up.
To route an analog input to the ADC:
1. Select the Input Mode button to correctly show if the input signal is single-ended (SE)or
fully-differential (Diff). Inputs that are single-ended should be made to the positive signal terminal.
2. Click on the button of the analog input channel that corresponds to the correct ADC. The caption of the
button should change to Active. Note that the user can connect some channels to both ADCs, while
others will only connect to one ADC.
3. Adjust the Level control to the desired attenuation for the connected channel. This level adjustment
can be done independently for each connection.
The TLV320AIC34 offers a programmable microphone bias that can either be powered down or set to
2.0V, 2.5V, or the power supply voltage of the ADC (AVDD_ADC). Control of the microphone bias (mic
bias) voltage is accomplished by using the Mic Bias pull-down menu button above the last two channel
strips. To use the on-board microphone, JMP2 and JMP3 must be installed and nothing should be
plugged into J6. In order for the mic bias settings in the software to take effect, JMP1 should be set to
connect positions 2 and 3, so that MICBIAS_A is controlled by the TLV320AIC34. MICBIAS_B is available
at J13-pin 14.
In the upper right portion of this tab are controls for Weak Common Mode Bias. Enabling these controls
will result in unselected inputs to the ADC channels to be weakly biased to the ADC common mode
voltage.
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TLV320AIC34EVM Software
Below these controls are the controls for the ADC PGA, including the master volume controls for the ADC
inputs. Each channel of the ADC can be powered up or down as needed using the Powered Up buttons.
PGA soft-stepping for each channel is selected using the pull-down menu control. The two large knobs set
the actual ADC PGA Gain and allow adjustment of the PGA gains from 0dB to 59.5dB in 0.5dB steps
(excluding Mute). At the extreme counterclockwise rotation, the channel is muted. Rotating the knob
clockwise increases the PGA gain, which is displayed in the box directly above the volume control.
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4.5 Audio Interface Tab
TLV320AIC34EVM Software
Figure 6. Audio Interface Tab
The Audio Interface tab (Figure 6) allows configuration of the audio digital data interface to the
TLV320AIC34.
The interface mode may be selected using the Transfer Mode control—selecting either I2S mode, DSP
mode, or Right- or Left-Justified modes. Word length can be selected using the Word Length control, and
the bit clock rate can also be selected using the Bit Clock rate control. The Data Word Offset, used in
TDM mode (see the product data sheet) can also be selected on this tab.
Along the bottom of this tab are controls for choosing the BLCK and WCLK as being either inputs or
outputs. With the codec configured in Slave mode, both the BCLK and WCLK are set to inputs. If the
codec is in Master mode, then BCLK and WCLK are configured as outputs. Additionally, two buttons
provide the options for 3-stating the DOUT line when there is not valid data and transmitting BLCK and
WCLK when the codec is powered down.
Re-sync of the audio bus is enabled using the controls in the lower right corner of this screen. Re-sync is
done if the group delay changes by more than ±FS/4 for the ADC or DAC sample rates (see the
TLV320AIC34 data sheet). The channels can be soft muted when doing the re-sync if the Soft Mute
button is enabled.
In the upper right corner of this tab is the Digital Mic Functionality control. The TLV320AIC34 can accept
a data stream from a digital microphone, which would have its clock pin connected to the TLV320AIC34
GPIO1 pin, and the mic data connected to the GPIO2 pin. Once the digital microphone functionality is
enabled, the Digital Mic/ADC Selection selection allows the user to choose if one or two digital
microphones are connected to the codec. If only one digital microphone is connected, then the remaining
ADC can be used with an analog input signal from the analog input pins. Refer to section Section 4.7 for a
discussion of setting the GPIO pin options. The TLV320AIC34 can provide a modulator clock to the digital
microphone with oversampling ratios (OSR) of 128, 64, or 32. For a detailed discussion of how to connect
a digital microphone, refer to the application note Using the Digital Microphone Function on
TLV320AIC33EVM with AIC33EVM/USB-MODEVM System (literature number SLAA275), available for
download at www.ti.com.
The default mode for the EVM is configured as 44.1kHz, 16-bit, I2words, and the codec is a slave (BCLK
and WCLK are supplied to the codec externally). For use with the PC software and the USB-MODEVM,
the default settings should be used; no change to the software are required.
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4.6 Clocks Tab
4.6.1 Configuring the codec clocks and Fsref calculation
TLV320AIC34EVM Software
Figure 7. Clocks Tab
The TLV320AIC34 provides a phase-locked loop (PLL) that allows flexibility in the clock generation for the
ADC and DAC sample rates. The Clocks tab contains the controls that can be used to configure the
TLV320AIC34 for operation with a wide range of master clocks. See the Audio Clock Generation
Processing figure in the TLV320AIC34 data sheet for further details of selecting the correct clock settings.
For use with the PC software and the USB-MODEVM, the clock settings must be set a certain way. If the
settings are changed from the default settings which allow operation from the USB-MODEVM clock
reference, the EVM settings can be restored automatically by pushing the Load EVM Clock Settings
button at the bottom of this tab. Note that changing any of the clock settings from the values loaded when
this button is pushed may result in the EVM not working properly with the PC software or USB interface. If
an external audio bus is used (audio not driven over the USB bus), then settings may be changed to any
valid combination. See Figure 7.
The codec clock source is chosen by the CODEC_CLK Source control. When this control is set to
CLKDIV_OUT, the PLL is not used; when set to PLLDIV_OUT, the PLL is used to generate the clocks.
Note: Per the TLV320AIC34 data sheet, the codec should be configured to allow the value of Fsref
to fall between the values of 39kHz to 53kHz.
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4.6.1.1 Use Without PLL
4.6.1.2 Use With The PLL
4.6.1.3 Setting the ADC and DAC Sampling Rates
TLV320AIC34EVM Software
Setting up the TLV320AIC34 for clocking without using the PLL permits the lowest power consumption by
the codec. The CLKDIV_IN source can be selected as either MCLK,GPIO2,orBCLK, the default is
MCLK. The CLKDIV_IN frequency is then entered into the CLKDIV_IN box, in megahertz (MHz). The
default value shown, 11.2896MHz, is the frequency used on the USB-MODEVM board. This value is then
divided by the value of Q, which can be set from 2 to 17; the resulting CLKDIV_OUT frequency is shown
in the indicator next to the Qcontrol. The result frequency is shown as the Actual Fsref.
When PLLDIV_OUT is selected as the codec clock source, the PLL will be used. The PLL clock source is
chosen using the PLLCLK_IN control, and may be set to either MCLK,GPIO2,orBCLK. The PLLCLK_IN
frequency is then entered into the PLLCLK_IN Source box.
The PLL_OUT and PLLDIV_OUT indicators show the resulting PLL output frequencies with the values set
for the P, K, and R parameters of the PLL. See the TLV320AIC34 data sheet for an explanation of these
parameters. The parameters can be set by clicking on the up/down arrows of the P,K,andRcombo
boxes, or they can be typed into these boxes.
The values can also be calculated by the PC software. To use the PC software to find the ideal values of
P, K, and R for a given PLL input frequency and desired Fsref:
1. Verify the correct reference frequency is entered into the PLLCLK_IN Source box in megaHertz (MHz)
2. The desired Fsref should be set using the Fsref switch.
3. Push the Search for Ideal Settings button. The software will start searching for ideal combinations of
P, K, and R which achieve the desired Fsref. The possible settings for these parameters are displayed
in the spreadsheet-like table labeled Possible Settings.
4. Click on a row in this table to select the P, K, and R values located in that row. Notice that when this is
done, the software updates the P, K, R, PLL_OUT and PLLDIV_OUT readings, as well as the Actual
Fsref and Error displays. The values show the calculations based on the values that were selected.
This process does not actually load the values into the TLV320AIC34, however; it only updates the
displays in the software. If more than one row exists, the user can choose the other rows to see which
of the possible settings comes closest to the ideal settings.
When a suitable combination of P, K, and R have been chosen, pressing the Load Settings into Device?
button will download these values into the appropriate registers on the TLV320AIC34.
The Fsref frequency that is determine either enabling or bypassing the PLL (see Section 4.6.1.1 or
Section 4.6.1.2) is used to determine the actual ADC and DAC sampling rates. Using the NADC and
NDAC factors the sampling rates are derived from the Fsref. If dual rate mode is desired, this option can
be enabled for either the ADC or DAC by pressing the corresponding Dual Rate Mode button. The ADC
and DAC sampling rates are shown in the box to the right of each control.
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4.7 GPIO Tab
TLV320AIC34EVM Software
Figure 8. GPIO Tab
The GPIO tab (see Figure 8) selects options for the general-purpose inputs and outputs (GPIO) of the
TLV320AIC34. Many pins on the TLV320AIC34 are denoted as multifunction pins, meaning they may be
used for many different purposes.
The GPIO1 groupbox contains controls for setting options for the GPIO1 pin. The Function control selects
the function of GPIO1 from the following:
•ADC Word Clock
•An output clock derived from the reference clock (see TLV320AIC34 data sheet)
•Interrupt output pin to signal:
– Short Circuit
– AGC Noise Threshold detection
– Jack/Headset detection
•For use as an interrupt output, the behavior of the interrupt can be selected using the Interrupt
Duration control. A Single, 2ms pulse can be delivered when the selected interrupt occurs, or
Continuous Pulses can be generated signaling the interrupt.
•Alternate I2S Word Clock
•A digital microphone output–modulator clock for use with a digital microphone (see Section 4.5 and the
TLV320AIC34 data sheet).
•A general-purpose I/O pin
– If selected as a General Purpose Input, the state of the GPIO1 pin is reflected by the Input Level
indicator. If selected as a General Purpose Output, the state of the GPIO1 pin can be set by using
the Output Level button.
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TLV320AIC34EVM Software
In similar fashion, the GPIO2 pin can configured as the following using the Function control in the GPIO2
groupbox.
•An alternate I2S bus
•An interrupt output
•A general-purpose I/O pin
•A digital microphone input
The other controls in this groupbox work the same as the corresponding controls for GPIO1.
The control interface for the TLV320AIC34 is always selected to be I2CsotheSDA and SCL groupboxes
and controls within them are disabled.
The MFP3 Function control selects MFP3 to be used either as a General Purpose Input or as the data
input line for the alternate I2S bus. The MFP2 Function control selects MFP2 as either Disabled or as a
General Purpose Output. When used as an output, the MFP2 Output Level control sets the output state
of the MFP2 pin either high or low. The states of the MFP0, MFP1 and MP3 inputs are indicated by the
three indicator lights on the right-hand side of this groupbox.
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4.8 AGC Tab
TLV320AIC34EVM Software
Figure 9. AGC Tab
The AGC tab (see Figure 9) consists of two identical sets of controls, one for the left channel and the
other for the right channel. The AGC function is described in the TLV320AIC34 data sheet.
The AGC can be enabled for each channel using the Enable AGC button. Target gain, Attack time in
milliseconds, Decay time in milliseconds, and the Maximum PGA Gain Allowed can all be set,
respectively, using the four corresponding knobs in each channel.
The TLV320AIC34 allows for the Attack and Decay times of the AGC to be setup in two different modes,
standard and advanced. The Left/Right AGC Settings button determines the mode selection. The
Standardmode provides several preset times that can be selected by adjustments made to the Attackand
Decayknobs. If finer control over the times is required, then the Advanced mode is selected to change to
the settings. When the Advanced mode is enabled, two tabs should appear that allow separate, advanced
control of the Attack and Delay times of the AGC (see Figure 10 and Figure 11). These options allow
selection of the base time as well as a multiplier to achieve the actual times shown in the corresponding
text box. The Use advanced settings? button should be enabled to program the registers with the correct
values selected via the pull-down options for base time and multiplier.
20 TLV320AIC34EVM-K SLAU232–December 2007
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