Cirrus-logic CS4228A Manuel d'utilisateur télécharger pdf (Page 24)

CS4228A

5.6 DAC Mute2 Control

Address 0x05

MUTEC Controls the MUTEC

0 - Normal operation

*1 - MUTEC

pin asserted low

MUTCZ Automatically asserts the MUTEC

pin on consecutive zeros. When enabled, 512 consecutive

zerosonallsixDACinputswillcausetheMUTEC

pin to be asserted low. A single non-zero

value on any DAC input will cause the MUTEC

pin to deassert.

*0 - Disabled

1 - Enabled

HMUTE56/34/12 Hard mute the corresponding DAC pair. When asserted, zero data is sent to the corresponding

DAC pair causing an instantaneous mute. To prevent high frequency transients on the outputs,

a DAC pair should be fully attenuated by asserting the corresponding MUT6-MUT1 bits in the

DAC Mute Control register or by writing 0xFF to the corresponding Digital Volume Control reg-

isters before asserting HMUTE.

*0 - Normal operation

1 - DAC pair is muted

5.7 DAC De-emphasis Control

Address 0x06

DEMS1:0 Selects the DAC de-emphasis response curve.

0- Reserved

1 - De-emphasis for 48 kHz

*2 - De-emphasis for 44.1 kHz

3 - De-emphasis for 32 kHz

DEM6 - DEM1 De-emphasis control for DAC6 - DAC1 respectively

*0 - De-emphasis off

1 - De-emphasis on

5.8 Digital Volume Control

Addresses 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C

VOL6 - VOL1 Address 0x0C - 0x07 sets the attenuation level for DAC 6 - DAC1 respectively. The attenutation

level is ramped up and down at the rate specified by RMP1:0 in the DAC Volume Control Setup

0 - 181 represents 0 to 90.5 dB of attenuation in 0.5 dB steps.

76543210

MUTEC MUTCZ RESERVED HMUTE56 HMUTE34 HMUTE12 RESERVED

10000000

76543210

DEMS1 DEMS0 DEM6 DEM5 DEM4 DEM3 DEM2 DEM1

10000000

76543210

VOLn

00000000

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 30 31 32

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Cirrus-logic CS4228A Manuel d'utilisateur Page 24

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