SM5846AP datasheet(23/36 Pages) NPC

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SM5846AP

NIPPON PRECISION CIRCUITS—23

Audio

ICs

Audio Data Input Interface

Serial data transmission is used for the digital audio

data input.

The data has the following format:

16/20/24/32-bit data length

Alternating left/right-channel serial data transmis-

sion

MSB ﬁrst

Rear packed

2s complement for negative values

Audio data input interface schematic

32bit SIPO Shiftregister

32bitRegister

Left channel

Input Data Buffer

Right channel

Input Data Buffer

Right channel

Input Data

Left channel

Input Data

32bitRegister

DIN

BCKI

LRCI

LRS

Audio data input interface pins

Audio data is input using pins LRCI, BCKI, and

DIN. The LRCI input polarity is determined by pin

LRS.

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.

Pin name

Function

LRCI

Left/right-channel latch clock input

BCKI

Bit transfer clock input

DIN

Serial data input

LRS

LRCI input polarity switch

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