Texas Instruments TLV320AIC3104EVM User manual

User's GuideSLAU218 – August 2007
TLV320AIC3104EVM and TLV320AIC3104EVM-PDK
This user's guide describes the characteristics, operation, and use of the TLV320AIC3104EVM, both byitself and as part of the TLV320AIC3104EVM-PDK. This evaluation module (EVM) is a complete stereoaudio codec with several inputs and outputs, extensive audio routing, mixing, and effects capabilities. Acomplete circuit description, schematic diagram, and bill of materials are also included.
The following related documents are available through the Texas Instruments Web site at www.ti.com .
EVM-Compatible Device Data Sheets
Device Literature Number
TLV320AIC3104 SLAS510TAS1020B SLES025REG1117-3.3 SBVS001TPS767D318 SLVS209SN74LVC125A SCAS290SN74LVC1G125 SCES223SN74LVC1G07 SCES296
Contents1 EVM Overview ............................................................................................................... 32 EVM Description and Basics ............................................................................................... 33 TLV320AIC3104EVM-PDK Setup and Installation ...................................................................... 74 TLV320AIC3104EVM Software ............................................................................................ 9Appendix A EVM Connector Descriptions ................................................................................... 37Appendix B TLV320AIC3104EVM Schematic ............................................................................... 41Appendix C TLV320AIC3104EVM Layout Views ........................................................................... 42Appendix D TLV320AIC3104EVM Bill of Materials ......................................................................... 45Appendix E USB-MODEVM Schematic ...................................................................................... 46Appendix F USB-MODEVM Bill of Materials ................................................................................ 47Appendix G USB-MODEVM Protocol ......................................................................................... 49
List of Figures
1 TLV320AIC3104EVM-PDK Block Diagram .............................................................................. 42 Default Software Screen ................................................................................................... 83 Device Selection Window ................................................................................................... 94 Interface Selection Window ................................................................................................ 95 I
2
C Address Selection Window .......................................................................................... 106 Default Configuration Tab ................................................................................................. 127 Audio Input Tab ............................................................................................................ 138 Bypass Paths ............................................................................................................... 149 Audio Interface Tab ....................................................................................................... 1510 Clocks Tab ................................................................................................................. 1711 GPIO Tab ................................................................................................................... 1912 AGC Tab .................................................................................................................... 21I
2
S, I
2
C are trademarks of Koninklijke Philips Electronics N.V.Windows is a trademark of Microsoft Corporation.SPI is a trademark of Motorola, Inc.LabView is a trademark of National Instruments.
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13 Left AGC Settings .......................................................................................................... 2214 Advanced .................................................................................................................... 2215 Filters Tab .................................................................................................................. 2316 ADC High Pass Filters .................................................................................................... 2417 ADC High-Pass Filter Settings ........................................................................................... 2418 DAC Filters .................................................................................................................. 2519 De-emphasis Filters ........................................................................................................ 2520 Enabling Filters ............................................................................................................ 2621 Shelf Filters ................................................................................................................. 2622 EQ Filters ................................................................................................................... 2723 Analog Simulation Filters ................................................................................................. 2724 Preset Filters ............................................................................................................... 2825 User Filters ................................................................................................................. 2826 3D Effect Settings ......................................................................................................... 2927 Output Stage Configuration Tab ......................................................................................... 3028 DAC/Line Outputs Tab .................................................................................................... 3229 High-Power Outputs Tab ................................................................................................. 3430 Command Line Interface Tab ............................................................................................ 3531 File Menu ................................................................................................................... 36C-1 Assembly layer ............................................................................................................. 42C-2 Top Layer .................................................................................................................... 42C-3 Layer 3 ....................................................................................................................... 43C-4 Layer 4 ....................................................................................................................... 43C-5 Silk Screen .................................................................................................................. 44C-6 Bottom Layer ................................................................................................................ 44
List of Tables
1 USB-MODEVM SW2 Settings ............................................................................................. 52 List of Jumpers ............................................................................................................... 5A-1 Analog Interface Pinout .................................................................................................... 37A-2 Alternate Analog Connectors ............................................................................................. 38A-3 Digital Interface Pinout..................................................................................................... 39A-4 Power Supply Pinout ....................................................................................................... 40D-1 TLV320AIC3104EVM Bill of Materials ................................................................................... 45F-1 USB-MODEVM Bill of Materials .......................................................................................... 47G-1 USB Control Endpoint HIDSETREPORT Request .................................................................... 49G-2 Data Packet Configuration ................................................................................................ 49G-3 GPIO Pin Assignments .................................................................................................... 52
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1 EVM Overview
1.1 Features
1.2 Introduction
2 EVM Description and Basics
2.1 TLV320AIC3104EVM-PDK Block Diagram
EVM Overview
•Full-featured evaluation board for the TLV320AIC3104 stereo audio codec.•Modular design for use with a variety of digital signal processor (DSP) and microcontroller interfaceboards.
•USB connection to PC provides power, control, and streaming audio data for easy evaluation.•Onboard microphone for ADC evaluation•Connection points for external control and digital audio signals for quick connection to othercircuits/input devices.
The TLV320AIC3104EVM-PDK is a complete evaluation kit, which includes a universal serial bus(USB)-based motherboard and evaluation software for use with a personal computer (PC) running theMicrosoft Windows™ operating system (Win2000 or XP).
The TLV320AIC3104EVM is in the Texas Instruments modular EVM form factor, which provides directevaluation of the device performance and operating characteristics, and eases software development andsystem prototyping. This EVM is compatible with the 5-6K Interface Evaluation Module (SLAU104 ) and theHPA-MCUINTERFACE (SLAU106 ) from Texas Instruments and additional third-party boards whichsupport the Texas Instrument modular EVM format.
The TLV320AIC3104EVM-PDK is a complete evaluation/demonstration kit, which includes a USB-basedmotherboard called the USB-MODEVM Interface board and evaluation software for use with a personalcomputer running the Microsoft Windows operating systems.
The TLV320AIC3104EVM-PDK is operational with one USB cable connection to a personal computer. TheUSB connection provides power, control, and streaming audio data to the EVM for reduced setup andconfiguration. The EVM also provides external control signals, audio data, and power for advancedoperation, which allows prototyping and connection to the rest of the development or system evaluation.
This section provides information on the analog input and output, digital control, power and generalconnection of the TLV320AIC3104EVM.
The TLV320AIC3104EVM-PDK consists of two separate circuit boards, the USB-MODEVM and theTLV320AIC3104EVM. The USB-MODEVM is built around a TAS1020B streaming audio USB controllerwith an 8051-based core. The motherboard features two positions for modular EVM, or one double-wideserial modular EVM may be installed. The TLV320AIC3104EVM is one of the double-wide modular EVMthat is designed to work with the USB-MODEVM.
The simple diagram below (Figure 1 ) shows the how the TLV320AIC3104EVM is connected to theUSB-MODEVM. The USB-MODEVM Interface board is intended to be used in USB mode, where controlof the installed EVM is accomplished using the onboard USB controller device. Provision is made,however, for driving all the data buses (I
2
C, SPI™, I
2
S/AC97) externally. The source of these signals iscontrolled by SW2 on the USB-MODEVM. Refer to Table 1 for details on the switch settings.
The USB-MODEVM has two EVM positions that allow for the connection of two small evaluation moduleor one larger evaluation module. The TLV320AIC3104EVM is designed to fit over both of the smallerevaluation module slots as shown below.
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2.1.1 USB-MODEVM Interface Board
EVM Position 2
EVM Position 1
TLV320AIC310xEVM
Control Interface
TLV320AIC310x
TAS1020B
USB 8051
Microcontroller
USB
SPI, I C
2
I S, AC97
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 Interfaceboard.
Because the TLV320AIC3104EVM is a double-wide modular EVM, it is installed with connections to bothEVM positions, which connects the TLV320AIC3104 digital control interface to the I
2
C port realized usingthe TAS1020B, as well as the TAS1020B digital audio interface..
In the factory configuration, the board is ready to use with the TLV320AIC3104EVM. To view all thefunctions and configuration options available on the USB-MODEVM board, see the USB-MODEVMInterface Board schematic in Appendix E.
Figure 1. TLV320AIC3104EVM-PDK Block Diagram
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2.2 Default Configuration and Connections
2.2.1 USB-MODEVM
2.2.2 TLV320AIC3104 Jumper Locations
EVM Description and Basics
Table 1 provides a list of the SW2 settings on the USB=MODEVM. For use with the TLV320AIC3104EVM,SW-2 positions 1 through 7 should be set to ON, while SW-2.8 should be set to OFF.
Table 1. USB-MODEVM SW2 Settings
SW-2 Switch Number Label Switch Description
1 A0 USB-MODEVM EEPROM I
2
C Address A0ON: A0 = 0OFF: A0 = 12 A1 USB-MODEVM EEPROM I
2
C Address A1ON: A1 = 0OFF: A1 = 13 A2 USB-MODEVM EEPROM I
2
C Address A2ON: A2 = 0OFF: A2 = 14 USB I
2
S I
2
S Bus Source SelectionON: I
2
S Bus connects to TAS1020OFF: I
2
S Bus connects to USB-MODEVM J145 USB MCK I
2
S Bus MCLK Source SelectionON: MCLK connects to TAS1020OFF: MCLK connects to USB-MODEVM J146 USB SPI SPI Bus Source SelectionON: SPI Bus connects to TAS1020OFF: SPI Bus connects to USB-MODEVM J157 USB RST RST Source SelectionON: EVM Reset Signal comes from TAS1020OFF: EVM Reset Signal comes from USB-MODEVM J158 EXT MCK External MCLK SelectionON: MCLK Signal is provided from USB-MODEVM J10OFF: MCLK Signal comes from either selection of SW2-5
Table 2 provides a list of jumpers found on the EVM and their factory default conditions.
Table 2. List of JumpersDefaultJumper 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 thepower supply through a resistor, which the user must install.
JMP2 Installed Connects onboard Mic to Left Microphone Input.
JMP3 Installed Connects onboard Mic to Right Microphone Input.
JMP4 Installed Provides a means of measuring IOVDD current.
JMP5 Installed Provides a means of measuring AVDD_ADC current.
JMP6 Installed Provides a means of measuring DVDD current.
JMP7 Installed Provides a means of measuring DRVDD current.
JMP8 Installed Provides a means of measuring AVDD_DAC current.
JMP9 Installed Connects Analog and Digital Grounds.
JMP10 3-5
When connecting 3 to 5, I
2
C is selected as control mode; when connecting 1 to 3, SPI is selected as control mode. Whenconnecting 3 to 4, mode selection can be made by a logic level at J16.12
JMP11 3-5
In I
2
C control mode, this jumper sets the state of A0. When connecting 3 to 5, A0 = 0; when connecting 1 to 3, A0 = 1. In SPI controlmode, connecting 3 to 4, SPI /SS is provided from J16.2
JMP12 3-5
In I
2
C control mode, this jumper sets the state of A1. When connecting 3 to 5, A1 = 0; when connecting 1 to 3, A1 = 1. In SPI controlmode, connecting 3 to 4, SPI SCLK is provided from J16.3
JMP13 Installed When installed, shorts across the output capacitor on HPLOUT; remove this jumper if using AC-coupled output drive
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2.3 Analog Signal Connections
2.3.1 Analog Inputs
2.3.2 Analog Output
2.4 Digital Signal Connections
2.4.1 Digital Inputs and Outputs
2.4.2 Digital Controls
2.5 Power Connections
EVM Description and Basics
Table 2. List of Jumpers (continued)DefaultJumper Position Jumper Description
JMP14 Installed When installed, shorts across the output capacitor on HPLCOM; remove this jumper if using AC-coupled output drive
JMP15 Installed When installed, shorts across the output capacitor on HPROUT; remove this jumper if using AC-coupled output drive
JMP16 Installed When installed, shorts HPLCOM and HPRCOM. Use only if these signals are set to constant VCM.
JMP17 Installed When installed, shorts across the output capacitor on HPRCOM; remove this jumper if using AC-coupled output drive
JMP18 Open Selects onboard EEPROM as Firmware Source.
JMP19 Open When installed, allows the USB-MODEVM to hardware reset the device under user control
The analog inputs to the EVM can be connected through two different methods. The analog input sourcescan be applied directly to J13 (top or bottom side) or through the analog headers (J1-3 and J6) around theedge of the board. The connection details of each header/connector can be found in Appendix A.
The analog outputs to the EVM can be connected through two different methods. The analog outputs areavailable from the J13 and J14 (top or bottom) or they may be accessed through J4, J5, J7, J11,and J12at the edges of the board. The connection details can be found in Appendix A.
The digital inputs and outputs of the EVM can be monitored through J16 and J17. If external signals needto be connected to the EVM, digital inputs should be connected via J14 and J15 on the USB-MODEVMand the SW2 switch should be changed accordingly (see Section 2.2.1 ). The connector details areavailable in Section A.2 .
The digital control signals can be applied directly to J16 and J17 (top or bottom side). The modularTLV320AIC3104EVM can also be connected directly to a DSP interface board, such as the5-6KINTERFACE or HPA-MCUINTERFACE, or to the USB-MODEVM Interface board if purchased as partof the TLV320AIC3104EVM-PDK. See the product folders on the TI Web site for these evaluationmodules or the TLV320AIC3104 for a current list of compatible interface and/or accessory boards.
The TLV320AIC3104EVM can be powered independently when being used in stand-along operation or bythe USB-MODEVM when it is plugged onto the motherboard.
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2.5.1 Stand-Alone Operation
2.5.2 USB-MODEVM Operation
3 TLV320AIC3104EVM-PDK Setup and Installation
3.1 Software Installation
TLV320AIC3104EVM-PDK Setup and Installation
When used as a stand-alone EVM, power is applied to J15 directly, making sure to reference the suppliesto the appropriate grounds on that connector.
CAUTION
Verify that all power supplies are within the safe operating limits shown on theTLV320AIC3104 data sheet before applying power to the EVM.
J15 provides connection to the common power bus for the TLV320AIC3104EVM. Power is supplied on thepins listed in Table A-4 .
The TLV320AIC3104EVM-PDK motherboard (the USB-MODEVM Interface board) supplies power to J15of the TLV320AIC3104EVM. Power for the motherboard is supplied either through its USB connection orvia terminal blocks on that board.
The USB-MODEVM Interface board can be powered from several different sources:•USB
•6-Vdc to 10-Vdc 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 defaultfactory configuration). When powered from 6-V to 10-Vdc, either through the J8 terminal block or J9 barreljack, JMP6 should have a shunt installed on pins 2–3. If power is applied in any of these ways, onboardregulators generate the required supply voltages and no further power supplies are necessary.
If laboratory 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 (+5 VA), J3 (+5 VD), J4 (+1.8 VD),and J5 (+3.3 VD). The +1.8 VD and +3.3 VD can also be generated on the board by the onboardregulators from the +5VD supply; to enable this configuration, the switches on SW1 need to be set toenable the regulators by placing them in the ON position (lower position, looking at the board with textreading right-side up). If +1.8 VD and +3.3 VD are supplied externally, disable the onboard regulators byplacing 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 TLV320AIC3104EVM-PDK, 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 thehardware configuration may be different.
1. Locate installation file on the CD-ROM included with the EVMs or download the latest version of thesoftware located on the AIC3104 Product Page . If downloading the software from the TI Web site, anoption is available to allow the user to be notified when the software is updated.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 usermay be prompted to restart their computer.
This should install all the TLV320AIC310x software and required drivers onto their PC.
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3.2 EVM Connections
TLV320AIC3104EVM-PDK Setup and Installation
1. Ensure that the TLV320AIC3104EVM is installed on the USB-MODEVM Interface board, aligning J13,J14, J15, J16, and 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 willprovide power, control signals, and streaming audio via the USB interface from the PC. On theUSB-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 automaticallysearch for them. Allow the automatic detection option.5. Once the PC confirms that the hardware is operational, D2 on the USB-MODEVM should light toindicate that the firmware has been loaded and the EVM is ready for use. If the LED is not lite, verifythat the drivers were installed and trying to unplug and restart at Step 3.
After the TLV320AIC3104EVM-PDK software installation (described in Section 3.2 ) is complete, evaluationand development with the TLV320AIC3104 can begin.
The TLV320AIC310xEVM software can now be launched. The user should see an initial screen that lookssimilar to Figure 2 .
Figure 2. Default Software Screen
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4 TLV320AIC3104EVM Software
4.1 Device Selection for Operation With AIC3104EVM
4.2 Interface Selection
TLV320AIC3104EVM Software
The following section discusses the details and operation of the EVM software.
Note: For configuration of the codec, the TLV320AIC3104 block diagram located in theTLV320AIC3104 data sheet is a good reference to help determine the signal routing.
The software that is installed provides operation for several devices. An initial window should appear thatlooks like Figure 3 . For operation with the TLV320AIC3104EVM, the user should select AIC3104 from thepulldown menu and click Accept. The software will take a few seconds to configure the software foroperation before proceeding. A progress bar should appear and show the status of the configuration.
Figure 3. Device Selection Window
When the program first starts up, a small window (Figure 4 ) appears that gives two choices for the controlinterface: IC or SPI. Click on the interface that will be used by the EVM, as selected by the jumper settingsdetailed in Table 2 . The setting of J10 should agree with the selection.
2
C interface is the default interfaceused by the EVM.
Figure 4. Interface Selection Window
If the I
2
C interface is selected, a second window then appears which allows for selecting the address ofthe TLV320AIC3104. This window (see Figure 5 ) has two sliders for setting the state of A0 and A1. Toallow proper communication with the EVM, these should match the settings of J11 and J12 (Table 2 ).When A0 and A1 are adjusted, the correct device address will be shown. Note that the actual I
2
C addressshown and the address for the software may be different. This is done for programming reasons and thecorrect address should be used for system development .
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TLV320AIC3104EVM Software
If the I
2
C address is desired to be changed at any time during normal operation of the EVM, this menu canalso be accessed from the pulldown menu under the Configuration item. This function can be used to helpprogram multiple devices.
Figure 5. I
2
C Address Selection Window
Note: For operation of the EVM in the default status, no changes are required on this panel. Thedefault settings are A1=A0=0. Changes to this panel are only required when operating theEVM with a specific I
2
C address (other than default) or when evaluating multiple EVM.
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4.3 Front Page Indicators and Functions
TLV320AIC3104EVM Software
Figure 2 illustrates the main screen of the EVM software. The indicators and buttons located above thetabbed section of the front page are visible regardless of which tab is currently being selected.
At the top left of the screen is an Interface indicator. This indicator shows which interface is selected forcontrolling the TLV320AIC3104, either I
2
C or SPI.
To the right of the Interface indicator is a group box called . This box indicates where the firmware beingused is operating from—in this release, the firmware is on the USB-MODEVM, so the user should seeUSB-MODEVM in the box labeled Located On:. The version of the firmware appears in the Version boxbelow this.
To the right, the next group box contains controls for resetting the TLV320AIC3104. A software reset canbe done by writing to a register in the TLV320AIC3104, and this is accomplished by pushing the buttonlabeled Software Reset. The TLV320AIC3104 also may be reset by toggling a pin on theTLV320AIC3104, which is done by pushing the Hardware Reset button.
CAUTION
In order to perform a hardware reset, the RESET jumper (JMP19) must beinstalled and SW2-7 on the USB-MODEVM must be turned OFF. Failure to doeither of these steps results in not generating a hardware reset or causingunstable operation of the EVM, which may require cycling power to theUSB-MODEVM.
Below the Firmware box, the Device Connected LED should be green when the EVM is connected. If theindicator is red, the EVM is not properly connected to the PC. Disconnect the EVM and verify that thedrivers 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 ofvarious portions of the TLV320AIC3104. These indicators are activated by pressing the IndicatorUpdates button below the Device Connected LED. These indicators, as well as the other indicators onthis 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 theTLV320AIC3104. Below these indicators are the AGC Noise Threshold Exceeded indicators that showwhen the AGC noise threshold is exceeded. To the far right of the screen, the Short Circuit Detectindicators show when a short-circuit condition is detected, if this feature has been enabled. Below theshort-circuit indicators, the AGC Gain Applied indicators use a bar graph to show the amount of gainwhich has been applied by the AGC, and indicators that light when the AGC is saturated.
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4.4 Default Configuration (Presets) Tab
TLV320AIC3104EVM Software
The Default Configuration Tab Figure 6 provides several different preset configurations of the codec. ThePreset Configurations buttons allow the user to choose from the provided defaults. When the selection ismade, the Preset Configuration Description are shows a summary of the codec setup associated withthe choice made. If the choice is acceptable, the Load button can be pressed and the preset configurationwill be loaded into the codec. The user can change to the Command Line Interface Tab (see Figure 30 )to view the actual settings that were programmed into the codec.
Figure 6. Default Configuration Tab
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4.5 Audio Input/ADC Tab
TLV320AIC3104EVM Software
Figure 7. Audio Input Tab
The Audio Input/ADC Tab allows control of the analog input mixer and the ADC. The controls aredisplayed to look similar to an audio mixing console (see Figure 7 ). Each analog input channel has avertical strip that corresponds to that channel. By default, all inputs are muted when the TLV320AIC3104is 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) orfully-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 thebutton should change to Active. Note that the user can connect some channels to both ADCs, whileothers will only connect to one ADC.3. Adjust the Level control to the desired attenuation for the connected channel. This level adjustmentcan be done independently for each connection.
The TLV320AIC3104 offers a programmable microphone bias that can either be powered down or set to 2V, 2.5 V, 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 pulldown menu button above the last two channel strips.To use the onboard microphone, JMP2 and JMP3 must be installed and nothing should be plugged intoJ6. In order for the mic bias settings in the software to take effect, JMP1 should be set to connectpositions 2 and 3, so that mic bias is controlled by the TLV320AIC3104.
In the upper right portion of this tab are controls for Weak Common Mode Bias. Enabling these controlswill result in unselected inputs to the ADC channels to be weakly biased to the ADC common modevoltage.
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4.6 Bypass Paths
TLV320AIC3104EVM Software
Below these controls are the controls for the ADC PGA, including the master volume controls for the ADCinputs. 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 pulldown menu control. The two large knobs setthe actual ADC PGA Gain and allow adjustment of the PGA gains from 0 dB to 59.5 dB in 0.5-dB steps(excluding Mute). At the extreme counterclockwise rotation, the channel is muted. Rotating the knobclockwise increases the PGA gain, which is displayed in the box directly above the volume control.
Figure 8. Bypass Paths
The Bypass Paths tab shows the active and passive bypass paths available for control.
The passive analog bypass paths allow the inputs to be routed straight through the device to the outputswithout turning on any of the internal circuitry. This provides a signal path through the device with minimalpower consumption.
The active bypass paths allow the inputs to bypass the ADC and DAC functional blocks and be routed tothe analog output mixers to be summed into the output amplifiers.
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4.7 Audio Interface Tab
TLV320AIC3104EVM Software
Figure 9. Audio Interface Tab
The Audio Interface tab (Figure 9 ) allows configuration of the audio digital data interface to theTLV320AIC3104.
The interface mode may be selected using the Transfer Mode control—selecting either I
2
S mode, DSPmode, or Right- or Left-Justified modes. Word length can be selected using the Word Length control, andthe bit clock rate can also be selected using the Bit Clock rate control. The Data Word Offset, used inTDM mode (see the TLV320AIC3104 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 oroutputs. With the codec configured in Slave mode, both the BCLK and WCLK are set to inputs. If thecodec is in Master mode, then BCLK and WCLK are configured as outputs. Additionally, two buttonsprovide the option for placing the DOUT line in a 3-state mode when there is not valid data andtransmitting BLCK and WCLK when the codec is powered down.
Re-synchronization of the audio bus is enabled using the controls in the lower right corner of this screen.Re-synchronization is done if the group delay changes by more than ±FS/4 for the ADC or DAC samplerates (see the TLV320AIC3104 data sheet). The channels can be soft muted when doing the re-sync if theSoft Mute button is enabled.
In the upper right corner of this tab is the Digital Mic Functionality control. The TLV320AIC3104 canaccept a data stream from a digital microphone, which would have its clock pin connected to theTLV320AIC3104 GPIO1 pin, and the mic data connected to the GPIO2 pin. Once the digital microphonefunctionality is enabled, the Digital Mic/ADC Selection selection allows the user to choose if one or twodigital microphones are connected to the codec. If only one digital microphone is connected, then theremaining ADC can be used with an analog input signal from the analog input pins. Refer to section
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TLV320AIC3104EVM Software
Section 4.9 for a discussion of setting the GPIO pin options. The TLV320AIC3104 can provide amodulator clock to the digital microphone with oversampling ratios (OSR) of 128, 64, or 32. For a detaileddiscussion of how to connect a digital microphone on this platform, refer to the application note Using theDigital Microphone Function on TLV320AIC3104 with AIC33EVM/USB-MODEVM System (SLAA275 ),available for download at www.ti.com .
The default mode for the EVM is configured as 44.1 kHz, 16-bit, I
2
words, and the codec is a slave (BCLKand 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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4.8 Clocks Tab
4.8.1 Configuring the codec clocks and Fsref calculation
TLV320AIC3104EVM Software
Figure 10. Clocks Tab
The TLV320AIC3104 provides a phase-locked loop (PLL) that allows flexibility in the clock generation forthe ADC and DAC sample rates. The Clocks tab contains the controls that can be used to configure theTLV320AIC3104 for operation with a wide range of master clocks. See the Audio Clock GenerationProcessing figure in the TLV320AIC3104 data sheet for further details of selecting the correct clocksettings.
For use with the PC software and the USB-MODEVM, the clock settings must be set a certain way. If thesettings are changed from the default settings which allow operation from the USB-MODEVM clockreference, the EVM settings can be restored automatically by pushing the Load EVMS Clock Settingsbutton at the bottom of this tab. Note that changing any of the clock settings from the values loaded whenthis button is pushed may result in the EVM not working properly with the PC software or USB interface. Ifan external audio bus is used (audio not driven over the USB bus), then settings may be changed to anyvalid combination. See Figure 10 .
The codec clock source is chosen by the CODEC_CLK Source control. When this control is set toCLKDIV_OUT, the PLL is not used; when set to PLLDIV_OUT, the PLL is used to generate the clocks.
Note: Per the TLV320AIC3104 data sheet, the codec should be configured to allow the value ofFsref to fall between the values of 39 kHz to 53 kHz.
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4.8.1.1 Use Without PLL
4.8.1.2 Use With The PLL
4.8.1.3 Setting the ADC and DAC Sampling Rates
TLV320AIC3104EVM Software
Setting up the TLV320AIC3104 for clocking without using the PLL permits the lowest power consumptionby the codec. The CLKDIV_IN source can be selected as either MCLK,GPIO2, or BCLK, the default isMCLK. The CLKDIV_IN frequency is then entered into the CLKDIV_IN box, in megahertz (MHz). Thedefault value shown, 11.2896 MHz, is the frequency used on the USB-MODEVM board. This value is thendivided by the value of Q, which can be set from 2 to 17; the resulting CLKDIV_OUT frequency is shownin 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 ischosen using the PLLCLK_IN control, and may be set to either MCLK,GPIO2, or BCLK. The PLLCLK_INfrequency 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 setfor the P, K, and R parameters of the PLL. See the TLV320AIC3104 data sheet for an explanation ofthese parameters. The parameters can be set by clicking on the up/down arrows of the P,K, and Rcombo 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 ofP, 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 ofP, K, and R which achieve the desired Fsref. The possible settings for these parameters are displayedin 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 isdone, the software updates the P, K, R, PLL_OUT, and PLLDIV_OUT readings, as well as the ActualFsref 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 TLV320AIC3104, however; it only updates thedisplays in the software. If more than one row exists, the user can choose the other rows to see whichof 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 TLV320AIC3104.
The Fsref frequency that is determine either enabling or bypassing the PLL (see Section 4.8.1.1 orSection 4.8.1.2 ) is used to determine the actual ADC and DAC sampling rates. Using the NADC andNDAC factors the sampling rates are derived from the Fsref. If dual rate mode is desired, this option canbe enabled for either the ADC or DAC by pressing the corresponding Dual Rate Mode button. The ADCand DAC sampling rates are shown in the box to the right of each control.
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4.9 GPIO Tab
TLV320AIC3104EVM Software
Figure 11. GPIO Tab
The GPIO tab (see Figure 11 ) selects options for the general-purpose inputs and outputs (GPIO) of theTLV320AIC3104. Many pins on the TLV320AIC3104 are denoted as multifunction pins, meaning they maybe used for many different purposes.
The GPIO1 group box contains controls for setting options for the GPIO1 pin. The Function controlselects the function of GPIO1 from the following:•ADC Word Clock•An output clock derived from the reference clock (see TLV320AIC3104 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 InterruptDuration control. A Single, 2ms pulse can be delivered when the selected interrupt occurs, orContinuous Pulses can be generated signaling the interrupt.•Alternate I
2
S Word Clock•A digital microphone output–modulator clock for use with a digital microphone (see Section 4.7 and theTLV320AIC3104 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 Levelindicator. If selected as a General Purpose Output, the state of the GPIO1 pin can be set by usingthe Output Level button.
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TLV320AIC3104EVM Software
In similar fashion, the GPIO2 pin can configured as the following using the Function control in the GPIO2group box.•An alternate I
2
S bus•An interrupt output•A general-purpose I/O pin•A digital microphone inputThe other controls in this group box work the same as the corresponding controls for GPIO1.
When the control interface for the TLV320AIC3104 is selected to be I
2
C, the SDA and SCL group boxesand controls within them are disabled. If SPI mode is selected, however, the SDA and SCL pins can beused as GPIO, and selected as either inputs or outputs using the SDA Function and SCL Functioncontrols. The Output Level and Input Level controls function for these pins in the same way that they dofor GPIO1 or GPIO2.
When the control interface for the TLV320AIC3104 is selected to be SPI, the Multifunction Pins groupbox and controls within it are disabled, because these pins are used by the SPI bus. When in I
2
C mode,however, these controls are enabled. The MFP3 Function control selects MFP3 to be used either as aGeneral Purpose Input or as the data input line for the alternate I
2
S bus. The MFP2 Function controlselects MFP2 as either Disabled or as a General Purpose Output. When used as an output, the MFP2Output 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 group box.
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