CS42L56 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS42L56

Ultralow Power, Stereo Codec with Class H Headphone Amp

Cirrus Logic 

6.38 Limiter Control, Release Rate (Address 2Dh)

7

LIMIT

6

LIMIT_ALL

5

LIMRRATE5

4

LIMRRATE4

3

LIMRRATE3

2

LIMRRATE2

CS42L56

1

LIMRRATE1

0

LIMRRATE0

6.38.1 Peak Detect and Limiter

Configures the peak detect and limiter circuitry.

LIMIT

0

1

Application:

Limiter Status

Disabled

Enabled

“Limiter” on page 46

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.

LIMIT_ALL

0

1

Application:

Limiter action:

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.

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.

“Limiter” on page 46

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.

LIMRRATE[5:0]

00 0000

···

11 1111

Application:

Release Time

Fastest Release

···

Slowest Release

“Limiter” on page 46

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.

DS851F2

85

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