CS42L56 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS42L56

Ultralow Power, Stereo Codec with Class H Headphone Amp

Cirrus Logic 

CS42L56

6.30.2 ALC Release Rate

Sets the rate at which the ALC releases the analog and/or digital attenuation from levels below the

MIN[2:0] threshold (“Limiter Cushion Threshold” on page 85) and returns the signal level to the PGAx-

VOL[5:0] (“PGAx Volume” on page 78) and ADCxVOL[7:0] (“ADCx Volume” on page 78) setting.

ALCRRATE[5:0]

00 0000

···

11 1111

Application:

Release Time

Fastest Release

···

Slowest Release

“Automatic Level Control (ALC)” on page 35

Notes:

1. The ALC release rate is user-selectable but is also a function of the sampling frequency, Fs, and the

DIGSFT (“Digital Soft Ramp” on page 64) and ANLGZCx (“Analog Zero Cross” on page 64) setting.

2. It is recommended that the Release Rate setting be slower than the Attack Rate.

6.31 ALC Threshold (Address 24h)

7

ALCMAX2

6

ALCMAX1

5

ALCMAX0

4

ALCMIN2

3

ALCMIN1

2

ALCMIN0

1

Reserved

0

Reserved

6.31.1 ALC Maximum Threshold

Sets the maximum level, below full scale, at which to limit and attenuate the input signal at the attack rate

(ALCARATE - “ALC Attack Rate” on page 79).

MAX[2:0]

000

001

010

011

100

101

110

111

Application:

Threshold Setting

0 dB

-3 dB

-6 dB

-9 dB

-12 dB

-18 dB

-24 dB

-30 dB

“Automatic Level Control (ALC)” on page 35

DS851F2

79

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