CS42L56 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS42L56

Ultralow Power, Stereo Codec with Class H Headphone Amp

Cirrus Logic 

CS42L56

6.31.2 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 80) 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 35

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

6.32 Noise Gate Control (Address 25h)

7

NGALL

6

5

4

NG

NG_BOOST

THRESH2

3

THRESH1

2

THRESH0

1

NGDELAY1

0

NGDELAY0

6.32.1 Noise Gate All Channels

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

NGALL

0

1

Noise Gate triggered by:

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

ONLY that channel.

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

take effect.

6.32.2 Noise Gate Enable

Configures the noise gate.

NG

Noise Gate Status

0

Disabled

1

Enabled

80

DS851F2

Share Link: