AS3412 datasheet(62/85 Pages) AMSOSRAM

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Page 61

[v1-00] 2016-Apr-06

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AS3412 − Register Description

Figure 76:

ANC_MODE Register Description

Name

Address

Default Value

ANC_MODE

0x14

00h

The ANC_MODE register controls various settings for the chipset in active noise cancelling mode like which

amplifiers are enabled as well as which audio inputs are active.

Bit

Bit Name

Default

Access

Bit Description

7:6

HPH_MUX<1:0>

R/W

This register selects the ANC input source for the

headphone amplifier in ANC mode. Depending on the

preamplifier or OPAMP1 can be connected to the

headphone amplifier input. It is also possible to

disconnect all ANC input sources which is sometimes

desired in monitor mode.

00: QMIC outputs are connected to HPH input

01: OP1 outputs are connected to HPH input

10: Do not use this setting

11: Nothing connected to HPH input except line input

in case it is enabled.

LIN_MUTE

R/W

This bit mutes the line input signal. If the bit is set the

line input signal is disconnected from the headphone

amplifier.

0: Line input signal enabled

1: Line input signal muted

1OP1R_ON

R/W

This register enables the right channel of OPAMP 1 in

ANC mode.

0: Right OP1 is switched off

1: Right OP1 is switched on

0OP1L_ON

R/W

This register enables the left channel of OPAMP 1 in

ANC mode.

0: Left OP1 is switched off

1: Left OP1 is switched on

AS3412 Datasheet(PDF) 62 Page - ams-OSRAM AG

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