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AUDIO DATA INTERFACE

INTERFACE MODE

DATA FORMAT

PCM1804

SLES022C – DECEMBER 2001 – REVISED OCTOBER 2007

The PCM1804 interfaces the audio system through BCK/DSDL (pin 16), LRCK/DSDBCK (pin 17), and

DATA/DSDR (pin 15). The PCM1804 needs RST = low when in the interface mode and/or the data format are

changed.

The PCM1804 supports master mode and slave mode as interface modes, which are selected by S/M (pin 8) as

shown in Table 4. In master mode, the PCM1804 provides the timing of the serial audio data communications

between the PCM1804 and the digital audio processor or external circuit. While in slave mode, the PCM1804

receives the timing for data transfer from an external controller. Slave mode is not available for DSD.

Table 4. Interface Mode

S/M

MODE

Low

Master mode

High

Slave mode

The PCM1804 supports four audio data formats in both master and slave modes, and these data formats are

selected by FMT0 (pin 6) and FMT1 (pin 7) as shown in Table 5.

Table 5. Data Format

FMT1

FMT0

FORMAT

MASTER

SLAVE

Low

Low

PCM, left-justified, 24-bit

Yes

Yes

Low

High

PCM, I2S, 24-bit

Yes

Yes

High

Low

PCM, standard, 24-bit

Yes

Yes

High

High

DSD

Yes

–

Copyright © 2001–2007, Texas Instruments Incorporated

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Product Folder Link(s): PCM1804