Datasheet

Analog Audio Interface

1-2 Blackfin A-V EZ-Extender Manual

3. Set the jumpers on the A-V EZ-Extender board. Use the block dia-

gram in Figure 2-1 on page 2-3 in conjunction with “Jumpers” on

page 2-7.

4. Set the switches and jumpers on the EZ-KIT Lite board. If not

already, familiarize yourself with the documentation and schemat-

ics of the EZ-KIT Lite (see “Related Documents”). Compare the

expansion interface signals of the A-V EZ-Extender board with the

signals of the EZ-KIT Lite board to ensure there is no contention.

For example, it may be necessary to disable other devices connected

to the parallel peripheral interface (PPI) of the processor, change

the routing of the PPI clocks and disable the push buttons.

5. Configure any other interfacing boards, for example, another

EZ-Extender or camera evaluation board.

Analog Audio Interface

For an audio application, the Blackfin A-V EZ-Extender uses the

AD1836A multichannel 96 kHz audio codec. The AD1836A is a

high-performance single-chip codec that provides three stereo digi-

tal-to-analog converters (outputs) and two stereo analog-to-digital

converters (inputs) using ADI’s patented multi-bit sigma-delta architec-

ture. The board includes a serial peripheral interface (SPI) port, allowing

the processor to adjust volume and other parameters. For a general over-

view of the audio interface connections, see Figure 2-1 on page 2-3. For

more detailed information, see “A-V EZ-Extender Schematic” on

page B-1.

SPORT0 of the expansion interface interfaces with the serial port of the

AD1836A codec. The processor is capable of transferring data to the

audio codec in time-division multiplexed (TDM) or I

S mode. The I

mode allows the codec to operate at a 96 kHz sample rate but allows only

two channels of output. TDM mode can operate at a maximum of 48 kHz