Texas Instruments TLV320AIC32EVM User manual

User's GuideSBAU113 – November 2005
TLV320AIC32EVM and TLV320AIC32EVM-PDK User's
Guide
This user's guide describes the characteristics, operation, and use of theTLV320AIC32EVM, both by itself and as part of the TLV320AIC32EVM-PDK. Thisevaluation module (EVM) is a complete stereo audio codec with several inputs andoutputs, extensive audio routing, mixing and effects capabilities. A complete circuitdescription, schematic diagram and bill of materials are also included.
The following related documents are available through the Texas Instruments web siteat www.ti.com .
EVM-Compatible Device Data Sheets
Device Literature Number
TLV320AIC32 SLAS479TAS1020B SLES025REG1117-3.3 SBVS001TPS767D318 SLVS209SN74LVC125A SCAS290SN74LVC1G125 SCES223SN74LVC1G07 SCES296
Contents1 EVM Overview ............................................................................................................... 22 Analog Interface .............................................................................................................. 33 Digital Interface .............................................................................................................. 44 Power Supplies .............................................................................................................. 55 EVM Operation ............................................................................................................... 66 Kit Operation ................................................................................................................. 77 EVM Bill of Materials ....................................................................................................... 36Appendix A TLV320AIC32EVM Schematic .................................................................................. 40Appendix B USB-MODEVM Schematic ...................................................................................... 41
List of Figures
1 TLV320AIC32EVM-PDK Block Diagram ................................................................................. 82 Default Software Screen .................................................................................................. 103 Audio Generator Screen .................................................................................................. 124 Audio Analyzer Screen ................................................................................................... 135 Audio Input Tab ............................................................................................................ 146 Audio Interface Tab ....................................................................................................... 167 Clocks Tab ................................................................................................................. 17
I
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.All trademarks are the property of their respective owners.
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1 EVM Overview
1.1 Features
1.2 Introduction
EVM Overview
8 AGC Tab .................................................................................................................... 199 Filters Tab .................................................................................................................. 2010 ADC Highpass Filter Settings ............................................................................................ 2111 Enabling Filters ............................................................................................................ 2112 Shelf Filters ................................................................................................................. 2213 EQ Filters ................................................................................................................... 2214 Analog Simulation Filters ................................................................................................. 2315 Preset Filters ............................................................................................................... 2316 De-emphasis Filters ....................................................................................................... 2417 User Filters ................................................................................................................. 2518 3D Effect Settings ......................................................................................................... 2519 DAC/Line Outputs Tab .................................................................................................... 2620 Output Stage Configuration Tab ......................................................................................... 2821 High Power Outputs Tab ................................................................................................. 2922 Command Line Interface Tab ............................................................................................ 3023 File Menu ................................................................................................................... 31
List of Tables
1 Analog Interface Pinout ..................................................................................................... 32 Alternate Analog Connectors ............................................................................................... 43 Digital Interface Pinout ...................................................................................................... 44 Power Supply Pin Out ....................................................................................................... 55 List of Jumpers ............................................................................................................... 76 USB-MODEVM SW2 Settings ............................................................................................. 97 USB Control Endpoint HIDSETREPORT Request .................................................................... 318 Data Packet Configuration ................................................................................................ 329 GPIO Pin Assignments .................................................................................................... 3410 TLV320AIC32EVM Bill of Materials ...................................................................................... 3711 USB-MODEVM Bill of Materials .......................................................................................... 38
•Full-featured evaluation board for the TLV320AIC32 stereo audio codec.•Modular design for use with a variety of digital signal processor (DSP) and microcontroller interfaceboards.
The TLV320AIC32EVM-PDK is a complete evaluation kit, which includes a universal serial bus(USB)-based motherboard and evaluation software for use with a personal computer running MicrosoftWindows™ operating systems (Win2000 or XP).
The TLV320AIC32EVM is in Texas Instruments' modular EVM form factor, which allows direct evaluationof the device performance and operating characteristics, and eases software development and systemprototyping. This EVM is compatible with the 5-6K Interface Evaluation Module (SLAU104 ) and theHPA-MCUINTERFACE (SLAU106 ) from Texas Instruments and additional third-party boards that supportthe TI Modular EVM format.
The TLV320AIC32EVM-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 Microsoft Windows operating systems.
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2 Analog Interface
Analog Interface
For maximum flexibility, the TLV320AIC32EVM is designed for easy interfacing to multiple analog sources.Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin dualrow header/socket combination at J1 and J2. These headers/sockets provide access to the analog inputand output pins of the device. Consult Samtec at www.samtec.com or call 1-800-SAMTEC-9 for a varietyof mating connector options. Table 1 summarizes the analog interface pinout for the TLV320AIC32EVM.
Table 1. Analog Interface Pinout
PIN NUMBER SIGNAL DESCRIPTION
J1.1 HPLCOM High Power Output Driver (Left Minus or Multifunctional)J1.2 HPLOUT High Power Output Driver (Left Plus)J1.3 HPRCOM High Power Output Driver (Right Minus or Multifunctional)J1.4 HPROUT High Power Output Driver (Right Plus)J1.5 LINE1L Left Input 1J1.6 LINE1R Right Input 1J1.7 LINE2L Left Input 2J1.8 LINE2R Right Input 2J1.9 AGND Analog GroundJ1.10 MIC3L Left Input 3J1.11 AGND Analog GroundJ1.12 MIC3R Right Input 3J1.13 AGND Analog GroundJ1.14 MICBIAS Microphone Bias Voltage OutputJ1.15 NC Not ConnectedJ1.16 NC Not ConnectedJ1.17 AGND Analog GroundJ1.18 NC Not ConnectedJ1.19 AGND Analog GroundJ1.20 NC Not ConnectedJ2.1 NC Not ConnectedJ2.2 NC Not ConnectedJ2.3 NC Not ConnectedJ2.4 NC Not ConnectedJ2.5 NC Not ConnectedJ2.6 NC Not ConnectedJ2.7 LEFT_LOP Left Line Output (Plus)J2.8 LEFT_LOM Left Line Output (Minus)J2.9 AGND Analog GroundJ2.10 RIGHT_LOP Right Line Output (Plus)J2.11 AGND Analog GroundJ2.12 RIGHT_LOM Right Line Output (Minus)J2.13 AGND Analog GroundJ2.14 NC Not ConnectedJ2.15 NC Not ConnectedJ2.16 NC Not ConnectedJ2.17 AGND Analog GroundJ2.18 NC Not ConnectedJ2.19 AGND Analog GroundJ2.20 NC Not Connected
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3 Digital Interface
Digital Interface
In addition to the analog headers, the analog inputs and outputs may also be accessed through alternateconnectors, either screw terminals or audio jacks. The stereo microphone input is also tied to J8 and thestereo headphone output (the HP set of outputs) is available at J9.
Table 2 summarizes the screw terminals available on the TLV320AIC32EVM.
Table 2. Alternate Analog Connectors
DESIGNATOR PIN 1 PIN 2 PIN3
J6 AGND LINE1R LINE1LJ7 MIC3L MIC3R AGNDJ10 (+) LEFT_LOP (-) LEFT_LOMJ11 (+) RIGHT_LOP (-) RIGHT_LOMJ12 (+) HPLOUT (-) HPLCOM AGNDJ13 (+) HPROUT (-) HPRCOM AGNDJ14 AGND LINE2R LINE2L
The TLV320AIC32EVM is designed to easily interface with multiple control platforms. Samtec partnumbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin dual rowheader/socket combination at J4 and J5. These headers/sockets provide access to the digital control andserial data pins of the device. Consult Samtec at www.samtec.com or call 1-800- SAMTEC-9 for a varietyof mating connector options. Table 3 summarizes the digital interface pinout for the TLV320AIC32EVM.
Table 3. Digital Interface Pinout
PIN NUMBER SIGNAL DESCRIPTION
J4.1 NC Not ConnectedJ4.2 NC Not ConnectedJ4.3 NC Not ConnectedJ4.4 DGND Digital GroundJ4.5 NC Not ConnectedJ4.6 NC Not ConnectedJ4.7 NC Not ConnectedJ4.8 RESET INPUT Reset signal input to AIC32EVMJ4.9 NC Not ConnectedJ4.10 DGND Digital GroundJ4.11 NC Not ConnectedJ4.12 NC Not ConnectedJ4.13 NC Not ConnectedJ4.14 AIC32 /RESET ResetJ4.15 NC Not ConnectedJ4.16 SCL I
2
C Serial ClockJ4.17 NC Not ConnectedJ4.18 DGND Digital GroundJ4.19 NC Not ConnectedJ4.20 SDA I
2
C Serial Data Input/OutputJ5.1 NC Not ConnectedJ5.2 NC Not ConnectedJ5.3 BCLK Audio Serial Data Bus Bit Clock (Input/Output)J5.4 DGND Digital Ground
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4 Power Supplies
4.1 Stand-Alone Operation
Power Supplies
Table 3. Digital Interface Pinout (continued)
PIN NUMBER SIGNAL DESCRIPTION
J5.5 NC Not ConnectedJ5.6 NC Not ConnectedJ5.7 WCLK Audio Serial Data Bus Word Clock (Input/Output)J5.8 NC Not ConnectedJ5.9 NC Not ConnectedJ5.10 DGND Digital GroundJ5.11 DIN Audio Serial Data Bus Data Input (Input)J5.12 NC Not ConnectedJ5.13 DOUT Audio Serial Data Bus Data Output (Output)J5.14 NC Not ConnectedJ5.15 NC Not ConnectedJ5.16 SCL I
2
C Serial ClockJ5.17 MCLK Master Clock InputJ5.18 DGND Digital GroundJ5.19 NC Not ConnectedJ5.20 SDA I
2
C Serial Data Input/Output
Note that J5 comprises the signals needed for an I
2
S™ serial digital audio interface; the control interface( I
2
C™ and RESET) signals are routed to J4. I
2
C is actually routed to both connectors; however, the deviceis connected only to J4.
J3 provides connection to the common power bus for the TLV320AIC32EVM. Power is supplied on thepins listed in Table 4 .
Table 4. Power Supply Pin Out
SIGNAL PIN NUMBER SIGNAL
NC J3.1 J3.2 NC+5VA J3.3 J3.4 NCDGND J3.5 J3.6 AGNDDVDD (1.8V) J3.7 J3.8 NCIOVDD (3.3V) J3.9 J3.10 NC
The TLV320AIC32EVM-PDK motherboard (the USB-MODEVM Interface board) supplies power to J3 ofthe TLV320AIC32EVM. Power for the motherboard is supplied either through its USB connection or viaterminal blocks on that board.
When used as a stand-alone EVM, power can be applied to J3 directly. The user must be sure toreference the supplies to the appropriate grounds on that connector.
CAUTIONVerify that all power supplies are within the safe operating limits shown onthe TLV320AIC32 data sheet before applying power to the EVM.
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4.2 USB-MODEVM Interface Power
5 EVM Operation
5.1 Analog Input
5.2 Analog Output
5.3 Digital Control
EVM Operation
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 defaultfactory configuration). When powered from 6V-10VDC, either through the J8 terminal block or the J9barrel 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, JMP6should 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 fromthe +5VD supply; to enable this configuration, the switches on SW1 need to be set to enable theregulators by placing them in the ON position (lower position, looking at the board with text readingright-side up). If +1.8VD and +3.3VD are supplied externally, disable the onboard regulators by placingSW1 switches in the OFF position.
Each power supply voltage has an LED (D1-D7) that lights when the power supplies are active.
This section provides information on the analog input and output, digital control, and general operatingconditions for the TLV320AIC32EVM.
The analog input sources can be applied directly to J1 (top or bottom side) or through signal conditioningmodules available for the modular EVM system.
The analog inputs may also be accessed through J8 and and screw terminals J6, J7, and J14.
The analog outputs from the TLV320AIC32 are available on J1 and J2 (top or bottom). They also may beaccessed through J9, J10, J11, J12, and J13.
The digital control signals can be applied directly to J4 and J5 (top or bottom side). The modularTLV320AIC32EVM 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 TLV320AIC32EVM-PDK. See the product folder for this EVM or the TLV320AIC32 for a current listof compatible interface and/or accessory boards.
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5.4 Default Jumper Locations
6 Kit Operation
Kit Operation
Table 5 lists the jumpers found on the EVM and their respective factory default conditions.
Table 5. List of Jumpers
DEFAULTJUMPER POSITION JUMPER DESCRIPTION
JMP1 Installed Connects analog and digital groundsJMP2 Open Selects on-board EEPROM as firmware sourceJMP3 Installed Connects on-board Mic to Left Microphone InputJMP4 Installed Connects on-board Mic to Right Microphone InputJMP5 Installed Provides a means of measuring IOVDD currentJMP6 Installed Provides a means of measuring DVDD currentJMP7 Installed Provides a means of measuring DRVDD currentJMP8 Installed Provides a means of measuring AVDD_DAC currentJMP9 Open When installed, allows the USB-MODEVM to hardware reset the device under usercontrolJMP10 2-3 When connecting 2-3, mic bias comes from the MICBIAS pin on the device; whenconnecting 1-2, mic bias is supplied from the power supply through a resistor, whichthe user must install.JMP11 Installed When installed, shorts across the output capacitor on HPLOUT; remove this jumper ifusing AC-coupled output driveJMP12 Installed When installed, shorts HPLCOM and HPRCOM. Use only if these signals are set toconstant VCM.JMP13 Installed When installed, shorts across the output capacitor on HPLCOM; remove this jumper ifusing AC-coupled output driveJMP14 Installed When installed, shorts across the output capacitor on HPROUT; remove this jumper ifusing AC-coupled output driveJMP15 Installed When installed, shorts across the output capacitor on HPRCOM; remove this jumper ifusing AC-coupled output drive
This section provides information on using the TLV320AIC32EVM-PDK, including set up, programinstallation, and program usage.
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6.1 TLV320AIC32EVM-PDK Block Diagram
EVM Position 2
EVM Position 1
TLV320AIC32EVM
Control Interface
TLV320AIC32
TAS1020B
USB 8051
Microcontroller
USB
SPI, I C
2
I S, AC97
2
Audio Interface
Kit Operation
A block diagram of the TLV320AIC32EVM-PDK is shown in Figure 1 . The evaluation kit consists of twocircuit boards connected together. The motherboard is designated as the USB-MODEVM Interface board,while the daughtercard is the TLV320AIC32EVM described previously in this manual.
Figure 1. TLV320AIC32EVM-PDK Block Diagram
The USB-MODEVM Interface board is intended to be used in USB mode, where control of the installedEVM is accomplished using the onboard USB controller device. Provision is made, however, for driving allthe data buses (I
2
C, SPI™, I
2
S/AC97) externally. The source of these signals is controlled by SW2 on theUSB-MODEVM. Refer to Table 6 for details on the switch settings.
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6.2 Installation
Kit Operation
Table 6. 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
For use with the TLV320AIC32EVM, SW-2 positions 1 through 7 should be set to ON, while SW-2.8should be set to OFF.
Ensure that the TLV320AIC32EVM is installed on the USB-MODEVM Interface board, aligning J1, J2, J3,J4, J5 with the corresponding connectors on the USB-MODEVM.
Place the CD-ROM into your PC CD-ROM drive. Locate the Setup program on the disk, and start it. TheSetup program will install the TLV320AIC32 Evaluation software on your PC.
After the main program is installed, the NI-VISA Runtime installer will automatically run. This softwareallows the program to communicate with the USB-MODEVM.
When the installation completes, click Finish on the TLV320AIC32EVM installer window. You may beprompted to restart your computer.
When installation is complete, attach a USB cable from your PC to the USB-MODEVM Interface board. Asconfigured at the factory, the board will be powered from the USB interface, so the power indicator LEDson the USB-MODEVM should light. Once this connection is established, launch the TLV320AIC32Evaluation software on your PC.
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6.3 USB-MODEVM Interface Board
Kit Operation
The software should automatically find the TLV320AIC32EVM, and a screen similar to the one in Figure 2
should appear.
Figure 2. Default Software Screen
The simple diagram shown in Figure 1 shows only the basic features of the USB-MODEVM Interface
board. The board is built around a TAS1020B streaming audio USB controller with an 8051-based core.
The board features two positions for modular EVMs, or one double-wide serial modular EVM may be
installed.
Since the TLV320AIC32EVM is a double-wide modular EVM, it is installed with connections to both EVM
positions, which connects the TLV320AIC32 digital control interface to the I2C port realized using the
TAS1020B, as well as the TAS1020B digital audio interface.
In the factory configuration, the board is ready to use with the TLV320AIC32EVM. To view all the functions
and configuration options available on the USB-MODEVM board, see the USB-MODEVM Interface Board
schematic in Appendix B.
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6.4 Program Description
6.5 Indicators and Main Screen Controls
Kit Operation
After the TLV320AIC32EVM-PDK software installation (described in Section 6.2 ) is complete, evaluationand development with the TLV320AIC32 can begin.
Figure 2 illustrates the indicators and controls near the top of the software screen display, and a largetabbed interface below. This section discusses the controls above this tabbed section.
At the top left of the screen is an Interface indicator. The TLV320AIC32 has an I
2
C interface. Theindicator is lit after the program begins.
To the right of the Interface indicator is a group box called Firmware. This box indicates where thefirmware being used is operating from—in this release, the firmware is on the USB-MODEVM, so youshould see USB-MODEVM in the box labeled Located On:. The version of the firmware appears in theVersion box below this.
To the right, the next group box contains controls for resetting the TLV320AIC32. A software reset can bedone by writing to a register in the TLV320AIC32; the writing is accomplished by pushing the buttonlabeled Software Reset. The TLV320AIC32 also may be reset by toggling a pin on the TLV320AIC32,which is done by pushing the Hardware Reset button.
CAUTIONIn order to perform a hardware reset, the RESET jumper (JMP9) must beinstalled and SW2-7 on the USB-MODEVM must be turned OFF. Failure todo either of these steps results in not generating a hardware reset orcausing unstable operation of the EVM, which may require cycling powerto the USB-MODEVM.
The ADC Overflow and DAC Overflow indicators light when the overflow flags are set in theTLV320AIC32. These indicators, as well as the other indicators on this panel, update only when thesoftware's front panel is inactive, once every 20ms. Below these indicators are other indicators that showwhen the AGC noise threshold is exceeded. To the far right on this screen, the short-circuit indicatorsshow when a short-circuit condition is detected, if this feature has been enabled. Below the short-circuitindicators is a bar graph that shows the amount of gain which has been applied by the AGC, andindicators that light when the AGC is saturated.
6.5.1 Audio Analyzer
Near the left side of the screen is a button labeled Audio Analyzer; this button can be set to ON or OFF.Pressing the button to turn it ON opens another window (see Figure 3 ). This feature provides the ability togenerate signals to be sent to the TLV320AIC32 DACs, as well as viewing and analyzing signals read bythe TLV320AIC32 ADCs. This ability to view and process the real-time streaming USB audio is ademanding task. Use of the Audio Analyzer feature requires a PC with at least 512MB of memory andreasonable processor speed (> 1GHz); computers with inadequate resources could still use the AudioAnalyzer to generate signals for the DACs, but will be unable to process signals from the ADCs becausethe FFT, distortion analysis, and signal-to-noise ratio analysis will not be able to keep up with the dataprocessing requirements.
The Audio Analyzer features two tabs. The front tab, shown in Figure 3 and titled Generator, createsdigital waveforms to send to the DACs. When first started, the function will be set to SNR (Output Zeros)which feeds only zero codes to the DAC. This function is commonly performed to test for the noise floor ofthe DAC.
The second function available is THD (-1dB sinewave). This function sends a sinewave at a coherentfrequency to the 44.1kHz sample rate to the DACs; this function is commonly used for testing THD+N.
These first two functions do not require any further settings; therefore, the frequency and amplitude knobsbelow the function selector are not used. Selecting a function of Function Generator allows the choice ofwaveform shape by using the pull-down menu next to the function selector, and the frequency andamplitude of that signal can be varied using the knobs below.
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Kit Operation
The output waveforms for both left and right channels are displayed in the graph at the bottom of thescreen in Figure 3 .
Figure 3. Audio Generator Screen
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Kit Operation
The second tab, titled Analyzer (Figure 4 ), handles the display and analysis of data from the ADCs.
Figure 4. Audio Analyzer Screen
The analyzer screen features a graph of the input signals, both left and right channels, in a time domaindisplay at the top of the screen, and in the frequency domain (FFT) at the bottom of the screen.
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6.6 Audio Input/ADC Tab
Kit Operation
Next to the time domain plots, calculated values of SINAD, SNR, and THD are shown. These values areall expressed in dB relative to the full-scale of the TLV320AIC32. Note that the SNR number shown isA-weighted.
In Figure 4 , a sine wave generated by the TLV320AIC32 DACs is fed through the high power drivers andback into the ADC; then the resulting FFTs can be seen. Note that this sequence is a full analog loopbacktest case, so the measured numbers show the combined performance of the DAC, drivers, and ADC.There is also no post-DAC filtering; as noted in the data sheet, this may degrade measurements eventhough there is no audible noise.
The Audio Input/ADC Tab is laid out like an audio mixing console. Each input channel has a vertical stripthat corresponds to that channel. LINE1L and LINE1R input strips have controls to route that input toeither the left or right ADC input; by default, all inputs are muted when the TLV320AIC32 is powered up.To route an input to the ADC, first click on the MUTE button in the input channel strip which correspondsto the ADC input channel you want that input to go to—the caption on the button will change to ACTIVE.The level of the input channel routed to that particular ADC channel can then be adjusted using the Levelknob below the MUTE/ACTIVE button. See Figure 5 .
Figure 5. Audio Input Tab
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6.7 Audio Interface Tab
Kit Operation
Similarly, the LINE2L and LINE2R inputs can be routed to the ADC. However, note that these inputs donot have the choice to route to either ADC channel, they can only be configured to connect to thecorresponding ADC input.
The MIC3L and MIC3R inputs are similar to the LINE1L and LINE1R inputs in that they can be routed toeither ADC input channel. Control of the mic bias is accomplished by using the pull-down menu at the topof these channel strips. The mic bias can either be powered down or set to 2.0V, 2.5V, or the powersupply voltage of the ADC (AVDD_ADC).
To use the on-board microphone, JMP3 and JMP4 must be installed and nothing should be plugged intoJ8. In order for the mic bias settings in the software to take effect, JMP10 should be set to connectpositions 2 and 3, so that mic bias is controlled by the TLV320AIC32.
In the upper right of this tab are controls for Weak Common Mode Bias. Enabling these controls willresult in unselected inputs to the ADC channels to be weakly biased to the ADC common mode voltage.
Below these controls are the controls for the ADC PGA—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. PGAsoft-stepping for each channel is selected using the control below this. The large knobs set the actualADC PGA Gain; at the extreme counterclockwise rotation, the channel is muted. Rotating the knobclockwise increases the PGA gain.
The Audio Interface tab (Figure 6 ) sets up the audio data interface to the TLV320AIC32. For use with thePC software and the USB-MODEVM, the default settings should be used. If using an external I
2
S source,or other data source, the interface mode may be selected using the Transfer Mode control—selectingeither I
2
S mode, DSP mode, or Right- or Left-Justified modes. Word length can be selected using theWord Length control, and the bit clock rate can also be selected using the Bit Clock rate control. TheData Word Offset, used in TDM mode (see the product datasheet ) can also be selected on this tab.
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Kit Operation
Figure 6. Audio Interface Tab
Along the bottom of this tab are controls for choosing the BLCK and WCLK as being either inputs oroutputs, as well as options for tristating the DOUT line when there is not valid data and transmitting BLCKand 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 isdone if the group delay changes by more than ±FS/4 for the ADC or DAC sample rates (see theTLV320AIC32 datasheet). The channels can be soft muted when doing the re-sync if the Soft Mute buttonis enabled.
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6.8 Clocks Tab
Kit Operation
The TLV320AIC32 has a very flexible scheme for generating the clock sources for ADC and DAC samplerates. The Clocks tab allows access to set the different options for setting up these clocks. Refer to theAudio Clock Generation Processing figure ( Figure 24) in the TLV320AIC32 datasheet.
For use with the PC software and the USB-MODEVM, the clock settings must be set a certain way. Thesesettings are not the default settings of the TLV320AIC32. The EVM-required settings can be loadedautomatically by pushing the Load EVM Clock Settings button at the bottom of this tab. Note thatchanging any of the clock settings from the values loaded when this button is pushed may result in theEVM not working properly with the PC software or USB interface. If an external audio bus is used (audionot driven over the USB bus), then settings may be changed to any valid combination. See Figure 7 .
Figure 7. Clocks Tab
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.
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Kit Operation
6.8.1 Use Without PLL
Setting up the TLV320AIC32 for clocking without using the PLL is straightforward. The CLKDIV_IN sourcecan be selected as either MCLK or BCLK; the default is MCLK. The CLKDIV_IN frequency is then enteredinto the CLKDIV_IN box, in megahertz (MHz). The default value shown, 11.2896MHz, is the frequencyused on the USB-MODEVM board. This value is then divided by the value of Q, which can be set from 2to 17; the resulting CLKDIV_OUT frequency is shown in the indicator next to the Qcontrol.
This frequency will then be used to calculate the actual Fsref frequency, and the ADC and DAC samplerates, after the NADC and NDAC factors are applied to the Fsref. If dual rate mode is desired, this optioncan be enabled for either the ADC or DAC by pressing the corresponding Dual Rate Mode button.
6.8.2 Use With The PLL
When PLLDIV_OUT is selected as the codec clock source, the PLL is used. The PLL clock source ischosen using the PLLCLK_IN control, and may be set to either MCLK 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. Refer to the TLV320AIC32 datasheet 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 PCsoftware.
To use the PC software to find the ideal values of P, K, and R for a given PLL input frequency and desiredFsref, the desired Fsref must be set using the switch on this tab; it can be set to either 44.1kHz or 48kHz.Once the desired Fsref and PLLCLK_IN values are correctly set, pushing the Search for Ideal Settingsbutton starts the software 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 PossibleSettings. Clicking on a row in this table sets the P, K, and R values in the software and updates thePLL_OUT and PLLDIV_OUT readings, as well as the Actual Fsref and Error displays. This process doesnot actually load the values into the TLV320AIC32, however; it only updates the displays in the software.This allows for different possible solutions to be selected and the error evaluated before loading into thedevice.
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 TLV320AIC32.
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6.9 AGC Tab
Kit Operation
The AGC tab (see Figure 8 ) consists of two identical sets of controls, one for the left channel and theother for the right channel. The AGC function is described in the TLV320AIC32 datasheet.
Figure 8. AGC Tab
The AGC can be enabled for each channel using the Enable AGC button. Target gain, Attack time inmilliseconds, Decay time in milliseconds, and the Maximum PGA Gain Allowed can all be set,respectively, using the four corresponding knobs in each channel.
Noise gate functions, such as Hysteresis,Clip stepping,Threshold, and Signal and Noise Detectdebouncing are set using the corresponding controls in the Noise Gate groupbox for each channel.
SBAU113 – November 2005 TLV320AIC32EVM and TLV320AIC32EVM-PDK User's Guide 19

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6.10 Filters Tab
Kit Operation
The TLV320AIC32 has a very rich feature set for applying digital filtering to audio signals. This tab controlsall of the filter features of the TLV320AIC32. In order to use this tab and plot filter responses correctly, theDAC sample rate must be set properly. Therefore, the clocks must be set up correctly in the softwarefollowing the discussion in Section 6.8 . See Figure 9 .
Figure 9. Filters Tab
The right-hand side of this tab shows a display which plots the magnitude and phase response of eachbiquad section, plus the combined responses of the two biquad sections. The coefficients used for theplotted responses are shown below the graph for both Biquad 1 and Biquad 2. Note that the plot showsonly the responses of the effect filters, not the combined response of those filters along with thede-emphasis and ADC high-pass filters.
TLV320AIC32EVM and TLV320AIC32EVM-PDK User's Guide20 SBAU113 – November 2005