Analog Devices ADSP-21262 EZ-KIT Lite Manual page 44

Using Analog Audio
2-4
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The master input clock (MCLK) for the AD1835A can be generated by
the on-board 12.288 MHz oscillator or can be supplied by one of the DAI
pins of the DSP. Using one if the pins to generate the MCLK, as opposed
to the on-board oscillator, allows synchronization of multiple devices in
the system. This is done on the EZ-KIT Lite when data is coming from
the SPDIF receiver and being output through the audio codec. The
SPDIF MCLK is routed to the AD1835A MCLK in the DSP's SRU. It is
also necessary to disable the on-board audio oscillator from driving the
audio codec and the DSP's input pin. For instructions on how to config-
ure the clock, refer to "Codec Setup Switch (SW7)" on page
The AD1835A codec can be configured as a master or as a slave, depend-
ing on DIP switch settings. In master mode, the AD1835A drives the
serial port clock and frame sync signals to the DSP. In slave mode, the
DSP must generate and drive all of the serial port clock and frame sync
signals. For information on how to set the mode, refer to
Switch (SW7)" on page
The AD1835A audio codec's internal configuration registers are config-
ured using the DSP's SPI port. The
the device. For information on how to configure the multichannel codec,
refer to the codec datasheet, which can be found at
The RCA connector (
J4
electret microphone on this connector, configure the
the instructions in "Electret Microphone Select Switch (SW6)" on
page 3-9. The four output channels connect to the RCA connector
Channel 4 of the codec connects to the headphone jack
information about the connectors see
Example programs are included in the EZ-KIT installation directory to
demonstrate how to configure and use the board's analog audio interface.
ADSP-21262 EZ-KIT Lite Evaluation System Manual
3-9.
register is used as the select for
FLAG3
) is used to input analog audio. When using an
"Connectors" on page
3-9.
"Codec Setup
.
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switch according
SW6
.
J5
. For more
J6
3-15.