WM8962B datasheet(219/295 Pages) WOLFSON

219 / 295 page

WM8962

Rev 4.3

219

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R20 (14h)

Noise Gate

15:12

ALC_NGATE_D

CY [3:0]

0011

Sets the Noise Gate Gain Decay Rate (time taken to ramp

up to the ALC_NGATE_GAIN level), measured in time per

1.5dB step.

If ALC_MODE = 0

0000 = 0.41ms / step

0001 = 0.82ms / step

…doubling with each step to…

1010 = 420ms / step

1011 = 840ms / step

1100 to 1111 = Reserved

If ALC_MODE = 1

0000 = 0.082ms / step

0001 = 0.164ms / step

…doubling with each step to…

1010 = 83.9ms / step

1011 = 168ms / step

1100 to 1111 = Reserved

Note that when 88.2kHz or 96kHz sample rate is selected,

the Noise Gate Gain Decay time is defined as for the

ALC_MODE=0 case above.

11:8

ALC_NGATE_A

TK [3:0]

0010

Sets the Gain Attack Rate (time taken to ramp down to the

ALC_NGATE_GAIN level), measured in time per 1.5dB

step.

If ALC_MODE = 0

0000 = 0.10ms / step

0001 = 0.21ms / step

…doubling with each step to…

1010 = 106ms / step

1011 to 1111 = Reserved

If ALC_MODE = 1

0000 = 0.020ms / step

0001 = 0.041ms / step

…doubling with each step to…

1010 = 21.0ms / step

1011 to 1111 = Reserved

Note that when 88.2kHz or 96kHz sample rate is selected,

the Noise Gain Attack time is defined as for the

ALC_MODE=0 case above.

7:3

ALC_NGATE_T

HR [4:0]

0_0000

Noise Gate Threshold. If the input signal falls below this

level, the Noise Gate function is triggered.

-76.5dB to -30dB in 1.5dB steps.

2:1

ALC_NGATE_M

ODE [1:0]

Noise gate mode

00 = Hold PGA gain static when noise gate triggers

01 = Mute ADC output immediately when noise gate

triggers.

10 = Ramp PGA Gain to ADC_NGATE_GAIN level when

Noise Gate triggers.

11 = Reserved

ALC_NGATE_E

Noise Gate function enable

0 = Disable

1 = Enable

WM8962B Datasheet(PDF) 219 Page - Wolfson Microelectronics plc

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