CXD3003 datasheet(42/137 Pages) SONY

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CXD3003R

Command

Data 3

Function

specification

DAC

EMPH

DAC

ATT

D15

D14

D13

D12

These command bits control the DAC.

Note) For normal stereo, channel 1 is the left channel and channel 2 is the right channel.

Command bit

DAC EMPH = 1

DAC EMPH = 0

Applies digital de-emphasis. The emphasis constants are

τ1 = 50µs and τ2 = 15µs

when Fs = 44.1kHz.

Turns digital de-emphasis off.

Processing

Command bit

DAC ATT = 1

DAC ATT = 0

Identical digital attenuation control is used for both channels 1 and 2. When common

attenuation data is specified, the attenuation values for channel 1 are used.

Independent digital attenuation control is used for both channels 1 and 2.

Processing

• I/O sync circuit

Related pins: LRCK and XWO, Related command: XWOC

During normal operation, the I/O sync circuit automatically synchronizes with the input LRCK, and its operation

proceeds in phase with the serial input data. However, there is a chance that synchronization will not be

performed if there is a great deal of jitter in LRCK, or if the power has just been turned on, etc. In this case,

forced synchronization is possible by setting the XWO pin or command XWOC low (0) for 2/Fs or more. Forced

synchronization must also be performed when switching the clock system such as when switching from CLV

mode to CAV mode and vice versa, or when switching the operating frequency, etc. The forced

synchronization operation is performed at the second rising edge of LRCK after the XWO pin is set low or the

XWOC command 19 set to 0.

∗ This is used to perform resynchronization to DAC.

This command has the function equal to the external pin XWO's.

Set to high or 1 for the external pin or unused side of the command register.

Command bit

External pin

XWOC

XWO

Processing

DAC sync window is open.

DAC sync window is not open.

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