CS42L56 查看數據表（PDF） - Cirrus Logic

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CS42L56

Ultralow Power, Stereo Codec with Class H Headphone Amp

Cirrus Logic 

CS42L56

6.32.3 Noise Gate Threshold and Boost

THRESH sets the threshold level of the noise gate. Input signals below the threshold level will be attenu-

ated to -96 dB. NG_BOOST configures a +30 dB boost to the threshold settings.

THRESH[2:0]

000

001

010

011

100

101

110

111

Minimum Setting (NG_BOOST = 0b)

-64 dB

-67 dB

-70 dB

-73 dB

-76 dB

-82 dB

Reserved

Reserved

Minimum Setting (NG_BOOST = 1b)

-34 dB

-36 dB

-40 dB

-43 dB

-46 dB

-52 dB

-58 dB

-64 dB

6.32.4 Noise Gate Delay Timing

Sets the delay time before the noise gate attacks.

NGDELAY[1:0]

00

01

10

11

Delay Setting

50 ms

100 ms

150 ms

200 ms

Note: The Noise Gate attack rate is a function of the sampling frequency, Fs, and the DIGSFT (“Digital

Soft Ramp” on page 64) setting.

6.33 ALC and Limiter Soft Ramp, Zero Cross Disables (Address 26h)

7

ALCASRDIS

6

ALCAZCDIS

5

ALCBSRDIS

4

ALCBZCDIS

3

LIMSRDIS

2

Reserved

1

Reserved

6.33.1 ALCx Soft Ramp Disable

Configures an override of the analog soft ramp setting.

ALCxSRDIS

0

1

ALC Soft Ramp Disable

OFF; ALC Attack Rate is dictated by the DIGSFT (“Digital Soft Ramp” on page 64) setting

ON; ALC volume changes take effect in one step, regardless of the DIGSFT setting.

0

Reserved

6.33.2 ALCx Zero Cross Disable

Configures an override of the analog zero cross setting.

ALCxZCDIS

0

1

ALC Zero Cross Disable

OFF; ALC Attack Rate is dictated by the ANLGZC (“Analog Zero Cross” on page 64) setting

ON; ALC volume changes take effect at any time, regardless of the ANLGZC setting.

6.33.3 Limiter Soft Ramp Disable

Configures an override of the digital soft ramp setting.

LIMSRDIS

0

1

Limiter Soft Ramp Disable

OFF; Limiter Attack Rate is dictated by the DIGSFT (“Digital Soft Ramp” on page 64) setting

ON; Limiter volume changes take effect in one step, regardless of the DIGSFT setting.

DS851F2

81

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