Using EZ-KIT Lite
The ELVIS interface is a LabVIEW-based design and prototype environ- ment for university science and engineering laboratories. The ELVIS interface consists of LabVIEW-based virtual instruments, a multifunction data acquisition (DAQ) device, and a custom-designed bench-top work- station and prototype board. This combination provides a ready-to-use suite of instruments found in most educational laboratories. Because the 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 is a high-performance, single-chip codec featuring four ste- reo digital-to-analog converters (DAC) for audio output and one stereo analog-to-digital converters (ADC) 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 the one of the DAC channels.
The processor is interfaced with the AD1835A via the DAI port. The DAI interface pins can be configured to transfer serial data from the AD1835A codec in either time-division multiplexed (TDM) or two-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 can be generated by the on-board 12.288 MHz oscillator or can be supplied by one of the DAI pins of the processor. Using one of 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 com- ing from the SPDIF receiver and being output through the audio codec. The SPDIF MCLK is routed to the AD1835A MCLK in the processor’s signal
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