Texas Instruments DEM-DAI3793A User Manual
www.ti.com
3.2.3.10 Digital Amplifier
3.2.4 LC89052T (DIR: Digital Audio I/F Receiver) Control Window
3.2.4.1
Audio Clock/Data Control Options
Speaker Short Detection, L-Ch; Speaker Short Detection, R-Ch
shows the Digital Amplifier function.
Figure 3-22. Digital Amplifier Function Menu Tab
Setting the operating speed of the Class-D speaker amplifier depends on the performance requirements;
click the checkbox to enable this function. Spectrum Spreading control (with Low, Mid, or High options)
and the Switching frequency (1.5MHz to 3MHz) can be selected here. Using this feature will help reduce
EMI noise. As the spectrum spreading control moves to high, the effect will be remarkable. Note, however,
that the signal-to-noise ratio (SNR) performance of the speaker output is affected by this function.
click the checkbox to enable this function. Spectrum Spreading control (with Low, Mid, or High options)
and the Switching frequency (1.5MHz to 3MHz) can be selected here. Using this feature will help reduce
EMI noise. As the spectrum spreading control moves to high, the effect will be remarkable. Note, however,
that the signal-to-noise ratio (SNR) performance of the speaker output is affected by this function.
illustrates the LC89052 Interface format choices.
Figure 3-23. LC89052 Interface Format Selection Options
There are several options available for the audio clock and data control features in the
DEM-DAI3793A/3794A EVM software.
DEM-DAI3793A/3794A EVM software.
For the system audio clock control, users can select any of these options:
•
PLL SCK: Selects the system clock rate for the PCM3793A.
•
XIN SCK or E-SCK: Selects the crystal oscillator frequency on Daughter Card #2
•
CKOUT Div: Selects the dividing rate for CKOUT
The serial audio data format is controlled by the other part of the drop-down menu; see
.
Select the data format for the DAC interface of the PCM3793A (it should match with the DAC setting on
the
the
tab).
SBAU127 – July 2007
Set-Up Guide
39