21

PCM1753, PCM1754, PCM1755

www.ti.com

SLES092E – APRIL 2003 – REVISED JULY 2019

Product Folder Links: PCM1753 PCM1754 PCM1755

Submit Documentation Feedback

Copyright © 2003–2019, Texas Instruments Incorporated

8.6.1.2.2

MUTx: Soft Mute Control

where x = 1 or 2, corresponding to the DAC outputs VOUTL (x = 1) and VOUTR (x = 2).

Default value: 0

The mute bits, MUT1 and MUT2, are used to enable or disable the soft mute function for the corresponding DAC

outputs, VOUTL and VOUTR. 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 infinite attenuation, one

attenuator step (0.5 dB) for every 8/fS seconds. This provides pop-free muting of the DAC output.

By setting MUTx = 0, the attenuator is increased one step for every 8/fS seconds to the previously programmed

attenuation level.

8.6.1.2.3

OVER: Oversampling Rate Control

Default value: 0

System clock rate = 256 fS, 384 fS, 512 fS, 768 fS, or 1152 fS:

System clock rate = 128 fS or 192 fS:

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 fS or 192 fS).

8.6.1.2.4

SRST: Reset

Default value: 0

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.

8.6.1.2.5

DACx: DAC Operation Control

Where x = 1 or 2, corresponding to the DAC output VOUTL (x = 1) or VOUTR (x = 2).

Default value: 0

The DAC operation controls are used to enable and disable the DAC outputs, VOUTL and VOUTR. 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 VCC.