PCM5142 datasheet(16/123 Pages) TI2

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PCM5141, PCM5142

SLAS759B – AUGUST 2012 – REVISED JANUARY 2016

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Feature Description (continued)

8.3.2 Audio Data Interface

8.3.2.1 Audio Serial Interface

The audio interface port is a 3-wire serial port with the signals LRCK, BCK, and DIN. BCK is the serial audio bit

clock, used to clock the serial data present on DIN into the serial shift register of the audio interface. Serial data

is clocked into the PCM514x on the rising edge of BCK. LRCK is the serial audio left/right word clock. LRCK

polarity for left/right is given by the format selected.

Table 4. PCM514x Audio Data Formats, Bit Depths and Clock Rates

MAX LRCK

CONTROL MODE

FORMAT

DATA BITS

SCK RATE [x fS]

BCK RATE [x fS]

FREQUENCY [fS]

Up to 192 kHz

128 – 3072

64, 48, 32

I2S/LJ

32, 24, 20, 16

384 kHz

64, 128

64, 48, 32

Software Control

Up to 48 kHz

128 – 3072

128, 256

(SPI or I2S)

TDM/DSP

32, 24, 20, 16

96 kHz

128 – 512

128, 256

192 kHz

128, 192, 256

128

Up to 192 kHz

128 – 3072

64, 48, 32

Hardware Control

I2S/LJ

32, 24, 20, 16

384 kHz

64, 128

64, 48, 32

The PCM514x requires the synchronization of LRCK and system clock, but does not need a specific phase

relation between LRCK and system clock.

If the relationship between LRCK and system clock changes more than ±5 SCK, internal operation (using an

onchip oscillator) is initialized within one sample period and analog outputs are forced to the bipolar zero level

until resynchronization between LRCK and system clock is completed.

If the relationship between LRCK and BCK are invalid more than 4 LRCK periods, internal operation (using an

onchip oscillator) is initialized within one sample period and analog outputs are forced to the bipolar zero level

until resynchronization between LRCK and BCK is completed.

8.3.2.2 PCM Audio Data Formats

The PCM514x supports industry-standard audio data formats, including standard I2S and left-justified. Data

formats are selected via Register (Pg0Reg40). All formats require binary twos-complement, MSB-first audio data;

up to 32-bit audio data is accepted.

The PCM514x also supports right-justified and TDM/DSP in software control mode. I2S, LJ, RJ, and TDM/DSP

are selected using Register (Pg0Reg40). All formats require binary twos-complement, MSB-first audio data. Up

to 32 bits are accepted. Default setting is I2S and 24-bit word length.

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