PCM5310PAPR datasheet(57/103 Pages) TI

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Registers 40 and 41 (28h and 29h)

PCM5310

www.ti.com ............................................................................................................................................................................................ SLES244 – FEBRUARY 2009

REG

HEX

DESCRIPTION

28h

Digital attenuation and mute control for DAC12

D12E

RSV

DUC2

DUC1

RSV

DZ12

29h

Digital gain boost and digital soft mute for DAC12

RSV

DB12[1:0]

DMU2

DMU1

D12E: Digital Attenuation and Mute Update Control Enable for DAC12

DUC2: Digital Attenuation and Mute Setting Update for DAC12, R-Channel

DUC1: Digital Attenuation and Mute Setting Update for DAC12, L-Channel

The digital attenuation and mute levels of DAC12 can be changed independently to any level by setting bits

DMU2 and DMU1 of Register 41, bits DAT1[7:0] of Register 42, and bits DAT2[7:0] of Register 43 when D12E =

'0'. When D12E = '1', the level is changed to any level at the same time when DUC2 = '1' or DUC1 = '1'. Both bits

are automatically set to '0' after being set to '1'. DUC2 and DUC1 must be set to '1' for every volume level setting

while HUPE = '1'.

Default value of D12E: 1. Default value of DUC2 and DUC1: 0

D12E = 0

Digital attenuation and mute update control disabled

D12E = 1

Digital attenuation and mute update control enabled (default)

DUC2, DUC1 = 0

No update level (default)

DUC2, DUC1 = 1

Update level (set to '0' automatically after setting to '1')

DZ12: Digital Attenuation and Mute Zero Crossing Enable for DAC12

This bit enables zero-crossing detection, which reduces zipper noise while the DAC digital attenuator and mute

settings are being changed. If no zero-crossing data are input for a 512/fS period (10.6 ms at a 48-kHz sampling

rate), then a timeout occurs and the PCM5310 volume level changes. Zero-crossing detection cannot be used

with continuous zero and dc data.

Default value: 1

Disabled

Enabled (default)

DB12[1:0]: Digital Gain Boost for DAC12

These bits boost the gain for the digital data input to the DAC12 channels before the digital attenuation.

Default value: 00

0dB (default)

6 dB

12 dB

18 dB

DMU2: Digital Mute Control for DAC12, R-Channel

DMU1: Digital Mute Control for DAC12, L-Channel

The PCM5310 can independently mute the DACs digital input data to zero level when DMU2 and DMU1 = '1'.

These settings take precedence over the attenuation level settings set by bits DAT1[7:0] and DAT2[7:0] in

regsiter 42. The analog outputs may have audible zipper noise while changing levels. This noise can be reduced

by selecting zero-crossing detection (Register 40, DZ12).

Default value: 0

Mute disabled (default)

Mute enabled

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