Cirrus Logic CS42L52 - Manual (Page 67)

DS680F2 67
CS42L52
3/1/13
6.31 Limiter Attack Rate (Address 29h)
6.31.1 Limiter Attack Rate
Sets the rate at which the limiter applies digital attenuation from levels above the MAX[2:0] threshold
(
“Limiter Maximum Threshold” on page 65 ).
Note: The limiter attack rate is user-selectable but is also a function of the sampling frequency, Fs, and
the DIGSFT ( “Digital Soft Ramp” on page 53 ) and DIGZC ( “Digital Zero Cross” on page 53 ) setting unless
the respective disable bit ( “Limiter Soft Ramp Disable” on page 65 or “Limiter Zero Cross Disable” on
page 66 ) is enabled.
6.32 ALC Enable and Attack Rate (Address 2Ah)
6.32.1 ALCx Enable
Configures the automatic level controller.
Notes:
1. When the ALC is enabled, the digital volume and PGA volume is automatically controlled and should
not be adjusted manually.
2. The ALC should only be configured while the power down bit is enabled.
3. The ALC is not available in passthrough mode.
6.32.2 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 68 ).
Note: The ALC attack 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 unless the respective disable bit ( “ALCx Soft Ramp Disable” on page 55 or “ALCx Zero
Cross Disable” on page 56 ) is enabled.
7 6 5 4 3 2 1 0
Reserved Reserved LIMARATE5 LIMARATE4 LIMARATE3 LIMARATE2 LIMARATE1 LIMARATE0
LIMARATE[5:0] Attack Time
00 0000 Fastest Attack
··· ···
11 1111 Slowest Attack
Application: “Limiter” on page 30
7 6 5 4 3 2 1 0
ALCB ALCA ALCARATE5 AALCRATE4 ALCARATE3 ALCARATE2 ALCARATE1 ALCARATE0
ALC ALC Status
0 Disabled
1 Enabled
Application: “Automatic Level Control (ALC)” on page 26
LIMARATE[5:0] Attack Time
00 0000 Fastest Attack
··· ···
11 1111 Slowest Attack
Application: “Automatic Level Control (ALC)” on page 26