SM5846AP Datasheet, PDF (23/36 Pages) Nippon Precision Circuits Inc – Multi-function Digital Filter

SM5846AP
Audio Data Input Interface
Audio data input interface pins
Serial data transmission is used for the digital audio
data input.
The data has the following format:
Audio data is input using pins LRCI, BCKI, and
DIN. The LRCI input polarity is determined by pin
LRS.
s 16/20/24/32-bit data length
s Alternating left/right-channel serial data transmis-
sion
s MSB first
s Rear packed
s 2s complement for negative values
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, depend-
ing on the selected polarity of the LRCI clock.
Audio data input interface schematic
Audio
ICs
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
NIPPON PRECISION CIRCUITS—23