Cirrus Logic CS42L52 - Manual (Page 68)

68 DS680F2
CS42L52
3/1/13
6.33 ALC Release Rate (Address 2Bh)
6.33.1 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 (
“ALC Minimum Threshold” on page 69 ) and returns the signal level to the PGAx-
VOL[5:0] ( “PGAx Volume” on page 56 ) and ADCxVOL[7:0] ( “ADCx Volume” on page 57 ) setting.
Notes:
1. The ALC release rate is user-selectable but is also a function of the sampling frequency, Fs, and the
ANLGSFTx (
“Ch. x Analog Soft Ramp” on page 49 ) and ANLGZCx ( “Ch. x Analog Zero Cross” on
page 49 ) setting.
2. The Release Rate setting must always be slower than the Attack Rate.
6.34 ALC Threshold (Address 2Ch)
6.34.1 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 67 ).
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 26
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 26