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CS42L55 Datasheet, PDF (63/73 Pages) Cirrus Logic – Ultra Low Power, Stereo CODEC w/Class H Headphone Amp | |||
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CS42L55
6.29.2 ALC Attack Rate
Sets the rate at which the ALC applies analog and/or digital attenuation from levels above the AMAX[2:0]
threshold (âALC Maximum Thresholdâ on page 64).
ALCARATE[5:0]
00 0000
···
11 1111
Application:
Attack Time
Fastest Attack
···
Slowest Attack
âAutomatic Level Control (ALC)â on page 24
Note: The ALC attack rate is user-selectable but is also a function of the sampling frequency, Fs, the
ANLGZCx (âAnalog Zero Crossâ on page 46) and the DIGSFT (âDigital Soft Rampâ on page 46) setting
unless the respective disable bit (âALCx Soft Ramp Disableâ on page 65 or âALCx Zero Cross Disableâ on
page 65) is enabled.
6.30 ALC Release Rate (Address 25h)
7
Reserved
6
Reserved
5
ALCRRATE5
4
ALCRRATE4
3
ALCRRATE3
2
ALCRRATE2
1
ALCRRATE1
0
ALCRRATE0
6.30.1 ALC Release Rate
Sets the rate at which the ALC releases the analog and/or digital attenuation from levels below the
MIN[2:0] threshold (âLimiter Cushion Thresholdâ on page 61) and returns the signal level to the PGAx-
VOL[5:0] (âPGAx Volumeâ on page 49) and ADCxVOL[7:0] (âADCx Volumeâ on page 50) setting.
ALCRRATE[5:0]
00 0000
···
11 1111
Application:
Release Time
Fastest Release
···
Slowest Release
âAutomatic Level Control (ALC)â on page 24
Notes:
1. The ALC release rate is user-selectable but is also a function of the sampling frequency, Fs, and the
DIGSFT (âDigital Soft Rampâ on page 46) and ANLGZCx (âAnalog Zero Crossâ on page 46) setting.
2. The Release Rate setting must always be slower than the Attack Rate.
DS773F1
63
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