CS42L52(2006) 查看數據表（PDF） - Cirrus Logic

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CS42L52
(Rev.:2006)

Low Power, Stereo CODEC w/Headphone & Speaker Amps

Cirrus Logic 

CS42L52

6.34.2 ALC Minimum Threshold

Sets the minimum level at which to disengage the ALC’s attenuation or amplify the input signal at the re-

lease rate (ALCRRATE - “ALC Release Rate” on page 68) until levels lie between the ALCMAX and AL-

CMIN thresholds.

ALCMIN[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 27

Note: This setting is usually set slightly below the ALCMAX threshold.

6.35 Noise Gate Control (Address 2Dh)

7

NGALL

6

5

4

NG

NG_BOOST THRESH2

3

THRESH1

2

THRESH0

1

0

NGDELAY1 NGDELAY0

6.35.1 Noise Gate All Channels

Sets which channels are attenuated when clipping on any single channel occurs.

NGALL

0

1

Application:

Noise Gate triggered by:

Individual channel; Any channel that falls below the threshold setting triggers the noise gate attenuation for

both channels.

Both channels A & B; Both channels must fall below the threshold setting for the noise gate attenuation to

take effect.

“Noise Gate” on page 28

6.35.2 Noise Gate Enable

Configures the noise gate.

NG

0

1

Application:

Noise Gate Status

Disabled

Enabled

“Noise Gate” on page 28

DS680A1

69

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