SM5846AP_06 Datasheet, PDF (22/36 Pages) Nippon Precision Circuits Inc – Multi-function Digital Filter

SM5846AP
Audio Data Input Interface
Serial data transmission is used for the digital audio
data input.
The data has the following format:
I 16/20/24/32-bit data length
I Alternating left/right-channel serial data transmis-
sion
I MSB first
I Rear packed
I 2s complement for negative values
Audio data input interface pins
Audio data is input using pins LRCI, BCKI, and
DIN. The LRCI input polarity is determined by pin
LRS.
Pin name
LRCI
BCKI
DIN
LRS
Function
Left/right-channel latch clock input
Bit transfer clock input
Serial data input
LRCI input polarity switch
Serial data on DIN is input to the serial-to-parallel
shift register on the falling edge of the bit transfer
clock BCKI. The parallel data is then stored in the
left/right-channel input buffers on the HIGH/LOW-
level pulse of the LRCI latch clock signal, depending
on the selected polarity of the LRCI clock.
Audio data input interface schematic
DIN
BCKI
LRCI
LRS
32bit SIPO Shiftregister
D
C
Q
32bit Register
D
Left channel
C Input Data Buffer
Q
32bit Register
D
Right channel
C _{Input Data Buffer}
Q
Left channel
Input Data
Right channel
Input Data
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