Datasheet

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6.5.2 MICBIAS Control
6.5.3 Digital Audio Data Controls
6.6 Clocks Tab
Kit Operation
Data going to the DACs is selected using the drop-down boxes under the Left and Right Datapath. Each
DAC channel can be selected to be off, use left channel data, use right channel data, or use a mono mix
of the left and right data.
Analog audio coming from the DACs is routed to outputs using the Output Path controls in each DAC
control panel. The DAC outputs can be mixed with the analog inputs (LINE2L, LINE2R) and routed to the
high power outputs using the mixer controls on the High Power Outputs tab. If the DAC is to be routed
directly to HP outputs, this can be selected as choices in the Output Path control. Note that if "HP Output
Driver" option is selected as the output path, the mixer controls on the High Power Output tabs have no
effect.
The microphone bias can either be powered down or set to 2.0V, 2.5V, or the power supply voltage of the
DAC (AVDD).
The DAC32 allows for multiple serial audio digital data configurations to provide maximum flexibility.
For use with the PC 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—selecting either I
2
S 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 SLAS506 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. When the codec is desired to be a master, BLCK and WCLK should be set to Output. When the
codec is desired to be a slave, the default settings of Input are correct. An indicator that allows for
transmitting BLCK and WCLK when the codec is powered down is also located at the bottom of this tab.
The TLV320DAC32 has a very flexible scheme for generating the clock sources for the DAC sample rate.
The Clocks tab allows access to set the different options for setting up these clocks. Refer to the Audio
Clock Generation Processing figure in the TLV320DAC32 data sheet.
For use with the PC software and the USB-MODEVM, the clock settings must be set a certain way. These
settings are not the default settings of the TLV320DAC32. The EVM-required settings can be loaded
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 3 .
SLAU201 – November 2006 TLV320DAC32EVM and TLV320DAC32EVM-PDK 11
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