CXD3003 datasheet(46/137 Pages) SONY

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CXD3003R

• DAC digital attenuator

Command

Data 3

D15

AT1D

AT2D

Audio

Ctrl

D14

D13

D12

D11

D10

Data 4

Data 5

Data 6

Note) AT1D7 to AT1D0 are the channel 1 ATT control bits.

AT2D7 to AT2D0 are the channel 2 ATT control bits.

Command bits

AT1D7 to AT1D0

(AT2D7 to AT2D0)

FF (H)

FE (H)

↓

01 (H)

00 (H)

0dB

–0.034dB

↓

–48.131dB

–

∞

Audio output

The attenuation data consists of 8 bits each for channels

1 and 2; the DAC ATT bit can be used to control

channels 1 and 2 with common attenuation data. (When

common attenuation data is specified, the attenuation

values for channel 1 are used.)

An attenuation value, from 00 (H) to FF (H), is

determined according to the following equation:

ATT = 20 log [input data/255] dB

Example: When the attenuation data is FA (H):

ATT = 20 log [250/255] dB = –0.172dB

• Soft mute

With the soft mute function, when the attenuation data goes from FF (H) and 00 (H) and vice versa, muting is

turned on and off over the muting time of 1024Fs [s] = 23.2 [ms] (Fs = 44.1kHz).

• Attenuation

Assume the attenuation data ATT1, ATT2 and ATT3, where ATT1 > ATT3 > ATT2. First, assume ATT1 is

transferred and then ATT2 is transferred. If ATT2 is transferred before ATT1 is reached (state "A" in the

diagram), then the value continues approaching ATT2. Next, if ATT3 is transferred before ATT2 is reached

(state "B" or "C" in the diagram), the attenuation begins approaching ATT3 from the current point. Note that it

takes 1024/Fs [s] (Fs = 44.1kHz for CD players) to transit between attenuation data (from 0dB to –

∞).

ATT1

ATT2

0dB

ATT3

Handling of the Attenuation Value

CXD3003 Datasheet(PDF) 46 Page - Sony Corporation

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