AK2301A Datasheet, PDF (14/20 Pages) Asahi Kasei Microsystems – 3.3V Single channel PCM CODEC LSI

ASAHI KASEI
AK2301A
PCM Data Interface
AK2301A supports the following 2 PCM data formats
- Long Frame Sync (LF)
- Short Frame Sync (SF)
PCM data is interfaced through the pin (DX, DR).
In each case, PCM data is interfaced by the 2’s compliment 2digit data with 16bit MSB first format.
However, internal CODEC is 14bit format operation, then the lowest 2bits output become to “L” level.
For the input, the lowest 2 bits are ignored.
Selection of the interface format
The AK2301A automatically selects the Long Frame/Short frame by means of detecting the length
frame signal.
LONG FRAME (LF) / SHORT FRAME (SF)
-Automatic LF/SF detection
AK2301A monitors the duration of the “H” level of FS and automatically selects LF or SF interface
format.
Period of FS=”H”
More than 2clocks of BCLK
Frame type
LF
1clock of BCLK
SF
Timing of the interface
16bit PCM data is accommodated in 1 flame (125µs) defined by 8kHz frame sync signal. Although there
are 4time slot at maximum in 8kHz frame (when BCLK = 512kHz), PCM data for AK2301A occupies
first time slot.
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2004/3