CS43L22 datasheet(55/68 Pages) CIRRUS

55 / 68 page

DS792F1

CS43L22

Confidential Draft

10/7/08

7.23.4

Limiter Zero Cross Disable

Configures an override of the digital zero cross setting.

7.24

Limiter Control 2, Release Rate (Address 28h)

7.24.1

Peak Detect and Limiter

Configures the peak detect and limiter circuitry.

7.24.2

Peak Signal Limit All Channels

Sets how channels are attenuated when the limiter is enabled.

7.24.3

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 54) and returns the analog output level to the MSTxVOL[7:0]

(“Master Volume Control” on page 52) 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 45) and DIGZC (“Digital Zero Cross” on page 46) setting.

LIMZCDIS

Limiter Zero Cross Disable

OFF; Limiter Attack Rate is dictated by the DIGZC (“Digital Zero Cross” on page 46) setting

ON; Limiter volume changes take effect in one step, regardless of the DIGZC setting.

Application:

“Limiter” on page 23

432

LIMIT

LIMIT_ALL

LIMRRATE5

LIMRRATE4

LIMRRATE3

LIMRRATE2

LIMRRATE1

LIMRRATE0

LIMIT

Limiter Status

Disabled

Enabled

Application:

“Limiter” on page 23

LIMIT_ALL

Limiter action:

Apply the necessary attenuation on a specific channel only when the signal amplitude 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.

Apply the necessary attenuation on BOTH channels when the signal amplitude 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 23

LIMRRATE[5:0]

Release Time

00 0000

Fastest Release

···

11 1111

Slowest Release

Application:

“Limiter” on page 23

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