MUTx: Soft Mute Control

DACx: DAC Operation Control

PCM1680

SLES133B – MARCH 2005 – REVISED OCTOBER 2008.................................................................................................................................................. www.ti.com

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 VOUTx. 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, VOUT1 through VOUT8. 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 VOUTx. 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, VOUT1 through VOUT8. 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 (VCOM), equal to VCC/2.

24

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