ADSP-21262 EZ-KIT Lite Evaluation System Manual
3-9
EZ-KIT Lite Hardware Reference
Electret Microphone Select Switch (SW6)
To connect an electret microphone to the audio input, place all positions
of the
SW6
switch “
ON
”. The default position of this switch is all “
OFF
”.
When all of the switches are in the “
ON
” position, a DC offset of 2.5V is
added to the signal, and gain of the input amplifiers is changed from 1x to
10x.
Codec Setup Switch (SW7)
The codec setup switch (
SW7
) can be used to change the routing of some of
the signals going to the AD1835A codec and to setup the communication
protocol of the codec.
Positions 1 and 2 determine the clock routing for the audio oscillator to
the codec and to the DSP.
Figure 3-5
illustrates how the switch positions
1 and 2 are connected on the board. In the default position, route the
DAI_P17
pin to
DAI_P6
(in software) to clock the AD1835A.
Position 3 of the
SW7
switch determines if the AD1835A device is a master
or is a slave. If the AD1835A is a master, the device’s serial interface gen-
erates the frame sync and clock signals necessary to transfer data. When
Figure 3-5. Audio Clock Routing
AD1835 Codec
MCLK
DAI_P6
ADSP-21262 DSP
DAI_P17
SW7.1
12.288MHz
OSC
SW7.2
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