PCM1795DB datasheet(30/58 Pages) TI

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R/W

REV

ATS1

ATS0

OPE

RSV

DMFS

FLT

INZD

B15

B14

B13

B12

B11

B10

PCM1795

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

The FMT[2:0] bits are used to select the data format for the serial audio interface.

For the external digital filter interface mode (DFTH mode), this register is operated as shown in the Application

for External Digital Filter Interface section.

DMF[1:0]: Sampling Frequency Selection for the De-Emphasis Function

These bits are available for read and write.

Default value: 00

DMF[1:0]

De-Emphasis Sampling Frequency Selection

Disabled (default)

48 kHz

44.1 kHz

32 kHz

The DMF[1:0] bits are used to select the sampling frequency used by the digital de-emphasis function when it is

enabled by setting the DME bit. The de-emphasis curves are shown in the Typical Characteristics section.

For the DSD mode, analog FIR filter performance can be selected using this register. A register map and filter

response plots are shown in the Application For DSD Format (DSD Mode) Interface section.

DME: Digital De-Emphasis Control

This bit is available for read and write.

Default value: 0

DME

De-Emphasis Setting

DME = 0

De-emphasis disabled (default)

DME = 1

De-emphasis enabled

The DME bit is used to enable or disable the de-emphasis function for both channels.

MUTE: Soft Mute Control

This bit is available for read and write.

Default value: 0

MUTE

Soft Mute Setting

MUTE = 0

Soft mute disabled (default)

MUTE = 1

Soft mute enabled

The MUTE bit is used to enable or disable the soft mute function for both channels.

Soft mute is operated as a 256-step attenuator. The speed for each step to –

∞ dB (mute) is determined by the

attenuation rate selected in the ATS register.

R/W: Read/Write Mode Select

When R/W = 0, a write operation is performed.

When R/W = 1, a read operation is performed.

Default value: 0

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