Datasheet

PCM1753
PCM1754
PCM1755
SLES092C – OCTOBER 2003 – REVISED FEBRUARY 2009
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21
By setting MUTx = 0, the attenuator is increased one step for every 8/f
S
seconds to the previously programmed
attenuation level.
OVER: Oversampling Rate Control
Default value: 0
System clock rate = 256 f
S
, 384 f
S
, 512 f
S
, 768 f
S,
or 1152 f
S
:
OVER = 0
64× oversampling (default)
OVER = 1 128× oversampling
System clock rate = 128 f
S
or 192 f
S
:
OVER = 0
32× oversampling (default)
OVER = 1 64× oversampling
The OVER bit is used to control the oversampling rate of the delta-sigma D/A converters. The OVER = 1 setting
is recommended when the sampling rate is 192 kHz (system clock rate is 128 f
S
or 192 f
S
).
SRST: Reset
Default value: 0
SRST = 0
Reset disabled (default)
SRST = 1 Reset enabled
The SRST bit is used to enable or disable the soft reset function. The operation is the same as power-on reset.
All registers are initialized.
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Register 19
0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV DMF1 DMF0 DM12 RSV RSV DAC2 DAC1
DACx: DAC Operation Control
Where x = 1 or 2, corresponding to the DAC output V
OUT
L (x = 1) or V
OUT
R (x = 2).
Default value: 0
DACx = 0
DAC operation enabled (default)
DACx = 1 DAC operation disabled
The DAC operation controls are used to enable and disable the DAC outputs, V
OUT
L and V
OUT
R. When
DACx = 0, the corresponding output generates the audio waveform dictated by the data present on the DATA
pin. When DACx = 1, the corresponding output is set to the bipolar zero level, or 0.5 V
CC
.
DM12: Digital De-Emphasis Function Control
Default value: 0
DM12 = 0
De-emphasis disabled (default)
DM12 = 1 De-emphasis enabled
The DM12 bit is used to enable or disable the digital de-emphasis function. See the plots shown in the Typical
Performance Curves section of this data sheet.