CS42436 datasheet(48/66 Pages) CIRRUS

48 / 66 page

DS647PP2

Function:

The individual channel volume levels are independently controlled by their respective Volume Control

registers when this function is disabled. When enabled, the volume on all channels is determined by

the AOUT1 and AIN1 Volume Control register and the other Volume Control registers are ignored.

7.7.2

SOFT RAMP AND ZERO CROSS CONTROL (ADC_SZC[1:0], DAC_SZC[1:0])

Default = 00

00 - Immediate Change

01 - Zero Cross

10 - Soft Ramp

11 - Soft Ramp on Zero Crossings

Function:

Immediate Change

When Immediate Change is selected all volume level changes will take effect immediately in one step.

Zero Cross

Zero Cross Enable dictates that signal level changes, either by gain changes, attenuation changes or

muting, will occur on a signal zero crossing to minimize audible artifacts. The requested level change

will occur after a timeout period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz

sample rate) if the signal does not encounter a zero crossing. The zero cross function is independent-

ly monitored and implemented for each channel.

Soft Ramp

Soft Ramp allows level changes, either by gain changes, attenuation changes or muting, to be imple-

mented by incrementally ramping, in 1/8 dB steps, from the current level to the new level at a rate of

1 dB per 8 left/right clock periods.

Soft Ramp on Zero Crossing

Soft Ramp and Zero Cross Enable dictates that signal level changes, either by gain changes, atten-

uation changes or muting, will occur in 1/8 dB steps and be implemented on a signal zero crossing.

The 1/8 dB level change will occur after a timeout period between 512 and 1024 sample periods (10.7

ms to 21.3 ms at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross

function is independently monitored and implemented for each channel.

7.7.3

AUTO-MUTE (AMUTE)

Default = 1

0 - Disabled

1 - Enabled

Function:

The Digital-to-Analog converters of the CS42436 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 during the mute period. The muting function is affected, similar to volume control

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

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