Cirrus Logic CS42L56 - Manual (Page 79)

DS851F2 79
CS42L56
6.30.2 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 (
“Limiter Cushion Threshold” on page 85 ) and returns the signal level to the PGAx-
VOL[5:0] ( “PGAx Volume” on page 78 ) and ADCxVOL[7:0] ( “ADCx Volume” on page 78 ) setting.
Notes:
1. The ALC release rate is user-selectable but is also a function of the sampling frequency, Fs, and the
DIGSFT ( “Digital Soft Ramp” on page 64 ) and ANLGZCx ( “Analog Zero Cross” on page 64 ) setting.
2. It is recommended that the Release Rate setting be slower than the Attack Rate.
6.31 ALC Threshold (Address 24h)
6.31.1 ALC Maximum Threshold
Sets the maximum level, below full scale, at which to limit and attenuate the input signal at the attack rate
(ALCARATE -
“ALC Attack Rate” on page 79 ).
ALCRRATE[5:0] Release Time
00 0000 Fastest Release
··· ···
11 1111 Slowest Release
Application: “Automatic Level Control (ALC)” on page 35
7 6 5 4 3 2 1 0
ALCMAX2 ALCMAX1 ALCMAX0 ALCMIN2 ALCMIN1 ALCMIN0 Reserved Reserved
MAX[2:0] Threshold Setting
000 0 dB
001 -3 dB
010 -6 dB
011 -9 dB
100 -12 dB
101 -18 dB
110 -24 dB
111 -30 dB
Application: “Automatic Level Control (ALC)” on page 35