CS4350 datasheet(31/39 Pages) CIRRUS

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DS691A3

CS4350

8.4

Mute Control - Register 04h

8.4.1

Auto-Mute (AMUTE) Bit 7

Function:

When set to 1 (default), the Digital-to-Analog converter output will mute following the reception of 8192

consecutive audio samples of static 0 or -1. A single sample of non-static data will release the mute. De-

tection and muting is done independently for each channel. The quiescent voltage on the output will be

retained and the Mute Control pin will go active during the mute period.

When set to 0, this function is disabled

8.4.2

AMUTEC = BMUTEC (MUTEC A=B) Bit 5

Function:

When set to 0 (default) the AMUTEC and BMUTEC pins operate independently.

When set to 1, the individual controls for AMUTEC and BMUTEC are internally connected through an

AND gate prior to the output pins. Therefore, the external AMUTEC and BMUTEC pins will go active only

when the requirements for both AMUTEC and BMUTEC are valid.

8.4.3

Channel A Mute (MUTE_A) Bit 4 & Channel B Mute (MUTE_B) Bit 3

Function:

When set to 1, the Digital-to-Analog converter output will mute. The quiescent voltage on the output will

be retained. The muting function is effected, similar to attenuation changes, by the Soft and Zero Cross

bits in the Volume and Mixing Control register. The corresponding MUTEC pin will go active following any

ramping due to the soft and zero cross function.

When set to 0 (default), this function is disabled.

8.5

Channel A & B Volume Control - Register 05h & 06h

Digital Volume Control (VOL[7:0]) Bits 7-0

Default = 00h (0 dB)

Function:

The Digital Volume Control registers allow independent control of the signal levels in 1/2 dB increments

from 0 to -127.5 dB. Volume settings are decoded as shown in Table 6. The volume changes are imple-

mented as dictated by the Soft and Zero Cross bits in the Power and Muting Control register. The actual

attenuation is determined by taking the decimal value of the volume register and multiplying by 6.02/12.

432

AMUTE

Reserved

MUTEC A=B

MUTE_A

MUTE_B

Reserved

000

432

VOL7

VOL6

VOL5

VOL4

VOL3

VOL2

VOL1

VOL0

000

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