User guide

70 DS679F1
CS42L51
6.22 Limiter Attack Rate Register (Address 1Bh)
Note: The DATA_SEL[1:0] bits in reg09h must be set to ‘01’b to enable function control in this register.
Limiter Attack Rate (ARATE[5:0])
Default: 000000
Function:
Sets the rate at which the limiter attenuates the analog output from levels above the maximum setting in the
limiter threshold register.
The limiter attack rate is user-selectable but is also a function of the sampling frequency, Fs, and the
DAC_SZC setting unless the disable bit is enabled.
6.23 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.
76543210
Reserved Reserved ARATE5 ARATE4 ARATE3 ARATE2 ARATE1 ARATE0
Binary Code Attack Time
000000 Fastest Attack
··· ···
111111 Slowest Attack
76543210
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