CS42418 datasheet(41/67 Pages) CIRRUS

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CS42418

The Digital-to-Analog converters of the CS42418 will mute the output following the reception of 8192

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

Detection and muting is done independently for each channel. The quiescent voltage on the output

will be retained and the MUTEC pin will go active during the mute period. The muting function is af-

fected, similar to volume control changes, by the Soft and Zero Cross bits (SZC[1:0]).

5.10.4 SOFT VOLUME RAMP-UP AFTER ERROR (RMP_UP)

Default = 0

0 - Disabled

1 - Enabled

Function:

An un-mute will be performed after executing a filter mode change, after a MCLK/LRCK ratio change

or error, and after changing the Functional Mode. When this feature is enabled, this un-mute is affect-

ed, similar to attenuation changes, by the Soft and Zero Cross bits (SZC[1:0]). When disabled, an im-

mediate un-mute is performed in these instances.

Note: For best results, it is recommended that this bit be used in conjunction with the RMP_DN bit.

5.10.5 SOFT RAMP-DOWN BEFORE FILTER MODE CHANGE (RMP_DN)

Default = 0

0 - Disabled

1 - Enabled

Function:

A mute will be performed prior to executing a filter mode or de-emphasis mode change. When this

feature is enabled, this mute is affected, similar to attenuation changes, by the Soft and Zero Cross

bits (SZC[1:0]). When disabled, an immediate mute is performed prior to executing a filter mode or

de-emphasis mode change.

Note: For best results, it is recommended that this bit be used in conjunction with the RMP_UP bit.

5.11

Channel Mute (address 0Eh)

5.11.1 INDEPENDENT CHANNEL MUTE (XX_MUTE)

Default = 0

0 - Disabled

1 - Enabled

Function:

The Digital-to-Analog converter outputs of the CS42418 will mute when enabled. The quiescent volt-

age on the outputs will be retained. The muting function is affected, similar to attenuation changes,

by the Soft and Zero Cross bits (SZC[1:0]).

76543

210

B4_MUTE

A4_MUTE

B3_MUTE

A3_MUTE

B2_MUTE

A2_MUTE

B1_MUTE

A1_MUTE

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