CS43L21 datasheet(44/63 Pages) CIRRUS

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DS723A1

CS43L21

Soft Ramp

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

by incrementally ramping, in 1/8 dB steps, from the current level to the new level at a rate of 0.5 dB per 4

left/right clock periods.

Soft Ramp on Zero Crossing

This setting dictates that signal-level changes, either by gain changes, attenuation 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 im-

plemented for each channel. Note: The LIM_SRDIS bit is ignored.

6.7

PCMX Mixer Volume Control:

PCMA (Address 10h) & PCMB (Address 11h)

Note: The DATA_SEL[1:0] bits in reg09h must be set to ‘01’b to enable function control in this register.

PCMX Mixer Channel Mute (MUTE_PCMMIXX)

Default = 1

0 - Disabled

1 - Enabled

Function:

The PCM channel X input to the output mixer will mute when enabled. The muting function is affected by

the DACX Soft and Zero Cross bits (DACX_SZC[1:0]).

PCMX Mixer Volume Control (PCMMIXX_VOL[6:0])

Default: 000 0000

Function:

The level of the PCMX input to the output mixer can be adjusted in 0.5 dB increments as dictated by the

DACX Soft and Zero Cross bits (DACX_SZC[1:0]) from +12 to -51.5 dB. Levels are decoded as described

in the table above.

43210

MUTE_

PCMMIXx

PCMMIXx_

VOL6

PCMMIXx_

VOL5

PCMMIXx_

VOL4

PCMMIXx_

VOL3

PCMMIXx_

VOL2

PCMMIXx_

VOL1

PCMMIXx_

VOL0

Binary Code

Volume Setting

001 1000

+12.0 dB

···

000 0000

0 dB

111 1111

-0.5 dB

111 1110

-1.0 dB

···

001 1001

-51.5 dB

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