Cirrus Logic CS42L56 - Manual (Page 85)

DS851F2 85
CS42L56
6.38 Limiter Control, Release Rate (Address 2Dh)
6.38.1 Peak Detect and Limiter
Configures the peak detect and limiter circuitry.
Note: The Limiter should only be configured while the power down bit ( “Power Down” on page 59 ) is
enabled.
6.38.2 Peak Signal Limit All Channels
Sets how channels are attenuated when the limiter is enabled.
6.38.3 Limiter Release Rate
Sets the rate at which the limiter releases the digital attenuation from levels below the CUSH[2:0] thresh-
old (
“Limiter Cushion Threshold” on page 85 ) and returns the analog output level to the MSTxVOL[7:0]
( “Master Volume Control” on page 70 ) setting.
Note: The limiter release rate is user-selectable but is also a function of the sampling frequency, Fs,
and the DIGSFT ( “Digital Soft Ramp” on page 64 ) setting unless the disable bit ( “Limiter Soft Ramp Dis-
able” on page 82 ) is enabled.
7 6 5 4 3 2 1 0
LIMIT LIMIT_ALL LIMRRATE5 LIMRRATE4 LIMRRATE3 LIMRRATE2 LIMRRATE1 LIMRRATE0
LIMIT Limiter Status
0 Disabled
1 Enabled
Application: “Limiter” on page 46
LIMIT_ALL Limiter action:
0
Apply the necessary attenuation on a specific channel only when the signal amplitudes on that specific chan-
nel rises above LMAX.
Remove attenuation on a specific channel only when the signal amplitude on that specific channel falls below
CUSH.
1
Apply the necessary attenuation on BOTH channels when the signal amplitudes on any ONE channel rises
above LMAX.
Remove attenuation on BOTH channels only when the signal amplitude on BOTH channels fall below CUSH.
Application: “Limiter” on page 46
LIMRRATE[5:0] Release Time
00 0000 Fastest Release
··· ···
11 1111 Slowest Release
Application: “Limiter” on page 46