CS53L21 datasheet(52/66 Pages) CIRRUS

52 / 66 page

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

543

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

543

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

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