PCM1795DB datasheet(43/58 Pages) TI

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APPLICATION FOR DSD FORMAT (DSD MODE) INTERFACE

BitClock

DSDDecoder

DATA

BCK

SCK

ZEROL

ZEROR

MSEL

LRCK

PCM1796

DATA_L

DATA_R

Feature

Pin Assignment When Using DSD Format Interface

PCM1795

www.ti.com ........................................................................................................................................................................................................ SLES248 – MAY 2009

Figure 58 shows a connection diagram for DSD mode.

Figure 58. Connection Diagram in DSD Mode

This mode is used for interfacing directly to a DSD decoder, which is found in Super Audio CD™ (SACD)

applications.

The DSD mode is accessed by programming the following bit in the corresponding control register.

• DSD = 1 (register 20)

The DSD mode provides a low-pass filtering function. The filtering is provided using an analog FIR filter structure.

Four FIR responses are available and are selected by the DMF[1:0] bits of control register 18.

The DSD bit must be set before inputting DSD data; otherwise, the PCM1795 erroneously detects the TDMCA

mode and commands are not accepted through the serial control interface.

Several pins are redefined for DSD mode operation. These include:

• DATA (pin 5): DSDL as left-channel DSD data input

• LRCK (pin 4): DSDR as right-channel DSD data input

• SCK (pin 7): DBCK as bit clock for DSD data

• BCK (pin 6): Set low (N/A)

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