CS44800 datasheet(56/80 Pages) CIRRUS

56 / 80 page

DS632F1

CS44800

trol changes, by the Soft and Zero Cross bits (SZC[1:0]). This bit does not cause a mute condition to occur.

The MUTE_50/50 bit only defines operation during a normal mute condition.

When MUTE_50/50 is set and a mute condition occurs, PSR will not affect the output of the modulator,

regardless if PSR is enabled. Output noise may be increased in this case if the noise on the high voltage

power supply is greater than the system noise. Therefore, it is recommended that if a noisy power supply

is used in a single-ended half-bridge configuration with PSR enabled, MUTE_50/50 should be disabled

and a normal, modulated mute should be used. This will allow the modulator to use the PSR feedback to

reject power supply noise and improve system performance.

7.7.4

Soft Ramp-Down on Interface Error (SRD_ERR)

Default = 0

0 - Disabled

1 - Enabled

Function:

A mute will be performed upon detection of a timing error on the Digital Audio Interface or if an

SRC_LOCK error has occurred. An SRC_LOCK interrupt is an indication that the sample rate converter

timings have become unstable, or have changed abruptly. Audio data from the SRC is no longer consid-

ered valid and could cause unwanted pops or clicks.

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 on detection of an error.

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

7.7.5

Soft Ramp-Up on Recovered Interface Error (SRU_ERR)

Default = 0

0 - Disabled

1 - Enabled

Function:

An un-mute will be performed after a MCLK/LRCK ratio change, recovered DAI timing error, or after the

SRC has gained lock. When this feature is enabled, this un-mute is affected, similar to attenuation chang-

es, by the Soft and Zero Cross bits (SZC[1:0]). When disabled, an immediate un-mute is performed in

these instances.

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

7.7.6

Auto-Mute (AMUTE)

Default = 1

0 - Disabled

1 - Enabled

Function:

The PWM converters of the CS44800 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 muting function is affected, similar to volume control

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

CS44800 Datasheet(PDF) 56 Page - Cirrus Logic

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