CS42L55 데이터 시트보기 (PDF) - Cirrus Logic

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CS42L55

Ultra Low Power, Stereo CODEC w/Class H Headphone Amp

Cirrus Logic 

CS42L55

6.29.2 ALC Attack Rate

Sets the rate at which the ALC applies analog and/or digital attenuation from levels above the AMAX[2:0]

threshold (“ALC Maximum Threshold” on page 64).

ALCARATE[5:0]

00 0000

···

11 1111

Application:

Attack Time

Fastest Attack

···

Slowest Attack

“Automatic Level Control (ALC)” on page 24

Note: The ALC attack rate is user-selectable but is also a function of the sampling frequency, Fs, the

ANLGZCx (“Analog Zero Cross” on page 46) and the DIGSFT (“Digital Soft Ramp” on page 46) setting

unless the respective disable bit (“ALCx Soft Ramp Disable” on page 65 or “ALCx Zero Cross Disable” on

page 65) is enabled.

6.30 ALC Release Rate (Address 25h)

7

Reserved

6

Reserved

5

ALCRRATE5

4

ALCRRATE4

3

ALCRRATE3

2

ALCRRATE2

1

ALCRRATE1

0

ALCRRATE0

6.30.1 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 61) and returns the signal level to the PGAx-

VOL[5:0] (“PGAx Volume” on page 49) and ADCxVOL[7:0] (“ADCx Volume” on page 50) setting.

ALCRRATE[5:0]

00 0000

···

11 1111

Application:

Release Time

Fastest Release

···

Slowest Release

“Automatic Level Control (ALC)” on page 24

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 46) and ANLGZCx (“Analog Zero Cross” on page 46) setting.

2. The Release Rate setting must always be slower than the Attack Rate.

DS773F1

63

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