Datasheet
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PCM3060
SLAS533B – MARCH 2007 – REVISED MARCH 2008
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Register 68 0 1 0 0 0 1 0 0 RSV OVER RSV RSV RSV DREV2 MUT22 MUT21
OVER: Oversampling Rate Control (DAC)
Default value: 0
OVER System clock = 512 f
S
or 768 f
S
System clock = 256 f
S
or 384 f
S
System clock = 128 f
S
or 192 f
S
OVER = 0 × 64 Oversampling (default) × 32 Oversampling (default) × 16 Oversampling (default)
OVER = 1 × 128 Oversampling × 64 Oversampling × 32 Oversampling
The OVER bit is used to control the oversampling rate of the delta-sigma D/A converters.
Setting OVER = 1 might improve out-of-band noise characteristics in some application environments, but it might
also slightly affect baseband performance.
Writing over this bit during normal operation may generate pop noise.
DREV2: Output Phase Select (DAC)
Default value: 0
DREV2 = 0 Normal output (default)
DREV2 = 1 Inverted output
The DREV2 bit is used to control the phase of the analog signal outputs (V
OUT
L and V
OUT
R).
MUT2x: Soft Mute Control (DAC)
where x = 1 or 2, corresponding to the DAC output V
OUT
L (x = 1) and V
OUT
R (x = 2).
Default value: 0
MUT2x = 0 Mute disabled (default)
MUT2x = 1 Mute enabled
The mute bits, MUT21 and MUT22, are used to enable or disable the soft mute function for the corresponding
DAC outputs, V
OUT
L and V
OUT
R. The soft mute function is incorporated into the digital attenuators. When mute is
disabled (MUT2x = 0), the attenuator and DAC operate normally. When mute is enabled by setting MUT2x = 1,
the digital attenuator for the corresponding output is decreased from the current setting to infinite attenuation at
the rate of one 0.5-dB step for every 8/f
S
time interval. By setting MUT2x = 0, the attenuator is increased to the
previously programmed attenuation level at the rate of one 0.5-dB step for every 8/f
S
time interval. This provides
pop-free muting of the DAC output.
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