AS3435 datasheet(72/102 Pages) AMSCO

72 / 102 page

AS3415/AS3435 – 72

ams Datasheet, Confidential: 2014-Jun-13 [v1-30]

Re g i st e r De sc rip t ion

Figure 91:

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, OPAMP1, OPAMP2 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: OP2 outputs are connected to HPH input

11: Nothing connected to HPH input except line input

and mixer input in case they are enabled.

LIN_MUTE

R/W

This bit defines the status of the line input mute

switch in active noise cancelling mode. If the bit is set

to ‘1’ the line input amplifier is disconnected from the

headphone amplifier.

0: Line input connected to headphone amplifier

1: Line input not connected to headphone amplifier

4MIX_ENABLE

R/W

This bit enables the headphone mixer input pin to mix

external signals to the headphone amplifier in active

noise cancelling mode.

0: HPH mixer input disabled

1: HPH mixer input enabled

3OP2L_ON

R/W

This register enables the left channel of OPAMP 2 in

ANC mode.

0: Left OP2 is switched off

1: Left OP2 is switched on

2OP2R_ON

R/W

This register enables the right channel of OPAMP 2 in

ANC mode.

0: Right OP2 is switched off

1: Right OP2 is switched on

1OP1L_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

0OP1R_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

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