Analog Devices Blackfin A-V EZ-Extender, Manual

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Blackfin A-V EZ-Extender Manual 1-3
A-V EZ-Extender Interfaces
Analog Audio Interface
The Blackfin A-V EZ-Extender supports audio applications with the
on-board AD1836A multichannel 96 kHz audio codec. The AD1836A
codec is a high-performance single-chip device that provides three stereo
digital-to-analog converters (outputs) and two stereo analog-to-digital
converters (inputs), using Analog Devices patented multibit sigma-delta
architecture. The board includes a serial peripheral interface (SPI) port,
enabling the processor to adjust volume and other parameters. For a gen-
eral overview of the audio interface connections, see
Figure 2-1 on
page 2-3 ; for details, see “A-V EZ-Extender Schematic” on page B-1 .
SPORT0
of the expansion interface connects to the serial port of the
AD1836A codec. The processor is capable of transferring data to the
audio codec in time-division multiplexed (TDM) mode or I
2
S mode. In
I
2
S mode, the codec can operate at a 96 kHz sample rate and allows two
channels of output. In TDM mode, the codec can operate at a maximum
of 48 kHz sample rate and allows simultaneous use of all input and output
channels. To operate in I
2
S mode, install the
JP7.1/2
jumper. For more
information, see “I2S Enable Jumper (JP7.1/2)” on page 2-13 .
Internal registers of the AD1836A audio codec can be programmed via the
SPI port of the processor. (For information on how to program the config-
uration registers, refer to the AD1836A data sheet.) The AD1836A codec
reset comes from a flag pin located at
PPI1_D11
of the expansion interface
or from the reset signal on the EZ-KIT Lite. For information on how to
configure the reset, see
“AV_RESET Source Jumper (JP9.1/3/5)” on
page 2-14 .
Before using the interface, follow the procedure in “A-V EZ-Extender
Setup” on page 1-2 .
For more information about the codec, go to
www.analog.com/AD1836A
.