CS42L56 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CS42L56 Datasheet PDF : 92 Pages
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6.29 ALC Enable & Attack Rate (Address 22h)
7
ALCB
6
ALCA
5
ALCARATE5
4
AALCRATE4
3
ALCARATE3
2
ALCARATE2
CS42L56
1
ALCARATE1
0
ALCARATE0
6.29.1 ALCx
Configures the automatic level controller (ALC).
ALC
0
1
Application:
ALC Status
Disabled
Enabled
“Automatic Level Control (ALC)” on page 35
Notes:
1. The ALC should only be configured while the power down bit (“Power Down” on page 59) is enabled.
2. The ALC is not available in passthrough mode.
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 80).
ALCARATE[5:0]
00 0000
···
11 1111
Application:
Attack Time
Fastest Attack
···
Slowest Attack
“Automatic Level Control (ALC)” on page 35
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 64) and the DIGSFT (“Digital Soft Ramp” on page 64) setting
unless the respective disable bit (“ALCx Soft Ramp Disable” on page 82 or “ALCx Zero Cross Disable” on
page 82) is enabled.
6.30 ALC Release Rate (Address 23h)
7
ALC_ALL
6
Reserved
5
ALCRRATE5
4
ALCRRATE4
3
ALCRRATE3
2
ALCRRATE2
1
ALCRRATE1
0
ALCRRATE0
6.30.1 ALC Limit All Channels
Sets how channels are attenuated when the ALC is enabled.
ALC_ALL
0
1
Application:
ALC action:
Apply the necessary attenuation on a specific channel only when the signal amplitudes on that specific chan-
nel rises above ALCMAX[2:0].
Remove attenuation on a specific channel only when the signal amplitude on that specific channel falls below
ALCMIN[2:0].
Apply the necessary attenuation on BOTH channels when the signal amplitudes on any ONE channel rises
above ALCMAX[2:0].
Remove attenuation on BOTH channels only when the signal amplitude on BOTH channels fall below ALC-
MIN[2:0].
“Automatic Level Control (ALC)” on page 35
Note: This function should only be used when the ALC for both channels is enabled.
78
DS851F2
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