Datasheet
MUTx: Soft Mute Control
DACx: DAC Operation Control
PCM1680
SLES133B – MARCH 2005 – REVISED OCTOBER 2008 ..................................................................................................................................................
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B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
REGISTER 7 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV MUT6 MUT5 MUT4 MUT3 MUT2 MUT1
REGISTER 18 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV RSV RSV RSV RSV MUT8 MUT7
Where x = 1 – 8, corresponding to the DAC output V
OUT
x. Default value: 0
MUTx = 0 Mute disabled (default)
MUTx = 1 Mute enabled
The mute bits, MUT1 through MUT8, are used to enable or disable the soft mute function for the corresponding
DAC outputs, V
OUT
1 through V
OUT
8. The soft mute function is incorporated into the digital attenuators. When
mute is disabled (MUTx = 0), the attenuator and DAC operate normally. When mute is enabled by setting
MUTx = 1, the digital attenuator for the corresponding output is decreased from the current setting to the
infinite-attenuation setting one attenuator step (S-dB) at a time. This provides a quiet, pop-free muting of the
DAC output. On returning from soft mute, by setting MUTx = 0, the attenuator is increased one step at a time to
the previously programmed attenuator level. The step size, S, is 0.5 dB for DAMS = 0 and 1 dB for DAMS = 1.
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
REGISTER 8 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV DAC6 DAC5 DAC4 DAC3 DAC2 DAC1
REGISTER 19 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV RSV RSV RSV RSV DAC8 DAC7
Where x = 1 – 8, corresponding to the DAC output V
OUT
x. 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
1 through V
OUT
8. When
DACx = 0, the output amplifier input is connected to the DAC output. When DACx = 1, the output amplifier input
is switched to the dc common voltage (V
COM
), equal to V
CC
/2.
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