Datasheet

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ATT CTRL START
Level Change Point
L-Channel
(1.5 kHz)
R-Channel
(1 kHz)
W0001-01
PCM1772 , PCM1773
SLES010G – SEPTEMBER 2001 – REVISED MARCH 2007
Register 04
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV RSV ZCAT RSV RSV RSV PWRD
IDX[6:0]: 000 0100b
ZCAT: Zero Cross Attenuation
Default Value: 0
ZCAT = 0 Normal attenuation (default)
ZCAT = 1 Zero cross attenuation
This bit enables changing the signal level on zero crossing during attenuation control or muting. If the signal
does not cross BPZ beyond 512/f
S
(11.6 ms at the 44.1-kHz sampling rate), the signal level is changed similarly
to normal attenuation control. This function is independently monitored for each channel; moreover, change of
signal level is alternated between both channels. Figure 28 shows an example of zero cross attenuation.
Figure 28. Example of Zero Cross Attenuation
PWRD: Power Down Control
Default Value: 0
PWRD = 0 Normal operation (default)
PWRD = 1 Power-down state
This bit is used to enter into low-power mode. Note that PWRD has no reset function.
When this bit is set to 1, the PCM1772 device enters low-power mode, and all digital circuits are reset except
the register states, which remain unchanged.
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