Cirrus Logic CS53L21 - Manual (Page 52)

52 DS700PP1
CS53L21
Function:
Implements mono mixes of the left and right channels as well as a left/right channel swap.
6.13 ALC Enable & Attack Rate (Address 1Ch)
ALC Enable (ALC_ENX)
Default: 0
0 - Disabled
1 - Enabled
Function:
Enables automatic level control for ADC channel x.
Note: When the ALC is enabled, the Attenuator and PGA volume is automatically controlled and should
not be adjusted manually.
ALC Attack Rate (ARATE[5:0])
Default: 000000
Function:
Sets the rate at which the ALC attenuates the analog input from levels above the maximum setting in the
ALC threshold register.
The limiter attack rate is user-selectable but is also a function of the sampling frequency, Fs, and the SOFTx
& ZCROSSx bit settings unless the disable bit for each function is enabled.
6.14 ALC Release Rate (Address 1Dh)
ALC Release Rate (RRATE[5:0])
Default: 111111
01 01
10 10
11 R 11 L
7 6 5 4 3 2 1 0
ALC_ENB ALC_ENA ALC_ARATE5 ALC_ARATE4 ALC_ARATE3 ALC_ARATE2 ALC_ARATE1 ALC_ARATE0
Binary Code Attack Time
000000 Fastest Attack
··· ···
111111 Slowest Attack
7 6 5 4 3 2 1 0
Reserved Reserved ALC_RRATE5 ALC_RRATE4 ALC_RRATE3 ALC_RRATE2 ALC_RRATE1 ALC_RRATE0
Binary Code Release Time
000000 Fastest Release
··· ···
111111 Slowest Release
ADCA[1:0] SDOUT ADCB[1:0] SDOUT
L R +
2
------------
L R +
2
------------