Analog Devices ADSP-21369 EZ-KIT Lite, Руководство пользователя

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Analog Audio
1-14 ADSP-21369 EZ-KIT Lite Evaluation System Manual
interface is based on LabVIEW and provides complete data acquisition
and prototyping capabilities, the system is ideal for academic coursework
that range from lower-division classes to advanced project-based
curriculums.
For more information on ELVIS and example demonstration programs,
visit National Instruments Web site at
www.ni.com
.
Analog Audio
The AD1835A device is a high-performance, single-chip codec featuring
four stereo digital-to-analog converters (DACs) for audio output and one
stereo analog-to-digital converters (ADCs) for audio input. The codec can
input and output data with a sample rate of up to 96 kHz on all channels.
A 192 kHz sample rate can be used with one of the DAC channels.
The processor is interfaced with the AD1835A codec via the DAI port.
The DAI pins can be configured to transfer serial data from the codec in
either time-division multiplexed (TDM) or 2-wire interface mode (TWI).
For more information on the AD1835A connection to the DAI, see
“DAI
Interface” on page 2-4 .
The master input clock (
MCLK
) for the AD1835A codec can be generated
by the on-board 12.288 MHz oscillator or supplied by one of the DAI
pins of the processor. Using a DAI pin 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
Sony/Philips Digital Interface (S/PDIF) receiver and being output
through the codec. The S/PDIF
MCLK
is routed to the AD1835A’s
MCLK
in
the processor’s signal routing unit (SRU). It is possible to disable the
on-board audio oscillator from driving the audio codec and the processor’s
input pin. For instructions on how to configure the clock, refer to
“Codec
Setup Switch (SW3)” on page 2-11 .