AS3418 datasheet(66/78 Pages) AMSOSRAM

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AS3418

Datasheet

• PUBLIC

DS000507

• v4-00 • 2020-Jan-23

│ 65

Addr: 0x15

AGC_CONTROL0

Bit

Bit Name

Default

Access

Bit Description

NEG_ATTEN_

R/W

This bit enables negative the negative gain option for

the microphone preamplifier in case of a microphone

overload condition. The gain can go down to -40dB.

In case the AGC_MUTE_EN bit is not. If the

AGC_MUTE_EN bit is set the preamplifier goes to -

40dB and eventually mutes the output.

0: Negative attenuation disabled

1: Negative attenuation enabled

AGC_EN

R/W

This bit enables/disabled the automatic gain control

function of AS3418. This setting is valid for ANC,

Monitor and PBO operation mode.

0: AGC disabled

1: AGC enabled

Figure 89:

AGC_ATTACK_RELEASE_TIME Register Description

Addr: 0x16

AGC_ATTACK_RELEASE_TIME

Bit

Bit Name

Default

Access

Bit Description

7:4

AGC_RELEAS

E_TIME

0001

R/W

This register controls the AGC release time.

0000: 0ms

0001: 0.5ms

0010: 1ms

0011: 2ms

0100: 4ms

0101: 8ms

0110: 10ms

0111: 12ms

1000: 16ms

1001: 20ms

1010: 24ms

1011: 28ms

1100: 32ms

1101: 64ms

1110: 128ms

1111: 256ms

3:0

AGC_ATTACK

_TIME

0000

R/W

This register controls the AGC attack time.

0000: 0.5µs

0001: 1µs

0010: 2µs

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