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Kit Operation
Figure 8. Audio Interface Tab
Along the bottom of this tab are controls for choosing the BLCK and WCLK as being either inputs or
outputs, as well as options for tristating 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
datasheet). 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 TLV320AIC33 can accept
a data stream from a digital microphone, which would have its clock pin connected to the TLV320AIC33
GPIO1 pin, and the mic data connected to the GPIO2 pin. Refer to section
for a discussion of
setting the GPIO pin options. The TLV320AIC33 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 on this platform, refer to the application note Using the Digital Microphone Function on
TLV320AIC33 with AIC33EVM/USB-MODEVM System (literature number
), available for
download at
.
SBAU114 – November 2005
TLV320AIC33EVM and TLV320AIC33EVM-PDK User's Guide
17