Datasheet

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PCM1738

SBAS174C – FEBRUARY 2002 – REVISED FEBRUARY 2007

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

These bits are read/write.

Default value: 00

DMF[1:0] De-Emphasis Same Rate Selection

00 Disabled (default)

01 48 kHz

10 44.1 kHz

11 32 kHz

The DMF[1:0] bits are used to select the sampling frequency used for the digital de-emphasis

function when it is enabled by setting the DME bit. The de-emphasis curves are shown in the

Typical Performance Curves section of this data sheet.

For DSD mode, analog FIR filter performance may be selected using this register. Filter response

plots are shown in the Typical Performance Curves section of this data sheet. The register map is

shown in the Application for DSD Format (DSD Mode) Interface section of this data sheet.

DME Digital De-Emphasis Control

This bit is read/write.

Default value: 0

For DSD mode, DME must be set to 1.

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 read/write.

Default value: 0

MUTE = 0 MUTE disabled (default)

MUTE = 1 MUTE enabled

The MUTE bit is used to enable the soft-mute function for both channels. The mute function is also

available through the MUTE control input (pin 15). Soft mute is performed by using the 256-step

attenuator, cycling one step per time interval to – (mute). The time interval is set by the rate select

bit (ATS), located in register 19.

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