CS42L51(2005) 查看數據表（PDF） - Cirrus Logic

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CS42L51
(Rev.:2005)

Low Power, Stereo CODEC with Headphone Amp

Cirrus Logic 

CS42L51

6.26 Noise Gate Configuration & Misc. (Address 1Fh)

7

NG_ALL

6

NG_EN

5

4

NG_BOOST THRESH2

3

THRESH1

2

THRESH0

1

0

NGDELAY1 NGDELAY0

Noise Gate Channel Gang (NG_ALL)

Default: 0

0 - Disabled

1 - Enabled

Function:

Gangs the noise gate function for channel A and B. When enabled, both channels must fall below the thresh-

old setting for the noise gate attenuation to take effect.

Noise Gate Enable (NG_EN)

Default: 0

0 - Disabled

1 - Enabled

Function:

Enables the noise gate. Maximum attenuation is relative to all gain settings applied.

Noise Gate Boost (NG_BOOST) and Threshold (THRESH[3:0])

Default: 000

THRESH[2:0]

000

001

010

011

100

101

110

111

Minimum Setting

(NG_BOOST = ‘0’b)

-64 dB

-67 dB

-70 dB

-73 dB

-76 dB

-82 dB

Reserved

Reserved

Minimum Setting

(NG_BOOST = ‘1’b)

-34 dB

-37 dB

-40 dB

-43 dB

-46 dB

-52 dB

-58 dB

-64 dB

Function:

Sets the threshold level of the noise gate. Input signals below the threshold level will be attenuated to -96

dB. NG_BOOST = ‘1’b adds 30 dB to the threshold settings.

Noise Gate Delay Timing (NGDELAY[1:0])

Default: 00

00 - 50 ms

01 - 100 ms

10 - 150 ms

11 - 200 ms

Function:

Sets the delay time before the noise gate attacks. Noise gate attenuation is dictated by the SOFTx &

ZCROSS bit settings unless the disable bit for each function is enabled.

70

DS679A2

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