Cirrus Logic CS42L55 - Manual (Page 63)

DS773F1 63
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 (
“ALC Maximum Threshold” on page 64 ).
Note: The ALC attack rate is user-selectable but is also a function of the sampling frequency, Fs, the
ANLGZCx ( “Analog Zero Cross” on page 46 ) and the DIGSFT ( “Digital Soft Ramp” on page 46 ) setting
unless the respective disable bit ( “ALCx Soft Ramp Disable” on page 65 or “ALCx Zero Cross Disable” on
page 65 ) is enabled.
6.30 ALC Release Rate (Address 25h)
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 (
“Limiter Cushion Threshold” on page 61 ) and returns the signal level to the PGAx-
VOL[5:0] ( “PGAx Volume” on page 49 ) and ADCxVOL[7:0] ( “ADCx Volume” on page 50 ) 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 46 ) and ANLGZCx ( “Analog Zero Cross” on page 46 ) setting.
2. The Release Rate setting must always be slower than the Attack Rate.
ALCARATE[5:0] Attack Time
00 0000 Fastest Attack
··· ···
11 1111 Slowest Attack
Application: “Automatic Level Control (ALC)” on page 24
7 6 5 4 3 2 1 0
Reserved Reserved ALCRRATE5 ALCRRATE4 ALCRRATE3 ALCRRATE2 ALCRRATE1 ALCRRATE0
ALCRRATE[5:0] Release Time
00 0000 Fastest Release
··· ···
11 1111 Slowest Release
Application: “Automatic Level Control (ALC)” on page 24