AD1986ABSTZ datasheet(24/56 Pages) AD

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AD1986A

Rev. 0 | Page 24 of 56

Table 78.

Function

Controls the gain of this input to the analog mixer from +12.0 dB to −34.5 dB. The least significant bit represents −1.5

dB.

[4:0]

Function

Default

0 0000

12 dB gain

0 1000

0 dB

Default

1 1111

−34.5 dB attenuation

V [4:0]

(Volume)

x xxxx

Muted

M (Mute)

Mutes the input to the analog mixer.

Default: muted (0x1)

Reserved.

Default: 0

MICROPHONE VOLUME (REGISTER 0x0E)

This register controls the MIC_1 (left) and MIC_2 (right) channels’ gain, boost, and mute to the analog mixer section. The volume register

contains five bits, generating 32 volume steps of −1.5 dB each for a range of +12.0 dB to −34.5 dB. This does not control the record ADC

gain (see Register 0x1C).

In typical stereo microphone applications, the signal paths must be identical and should be set to the same gain, boost, and mute values.

With stereo controls, this input is capable of using nonmicrophone sources by disabling the microphone boost (M20 bit = 0).

Reg

Name

D15

D14

D13

D12

D11

D10

Default

0x0E

Microphone

Volume

LV4

LV3

LV2

LV1

LV0

M20

RV4

RV3

RV2

RV1

RV0

0x8888

Table 79.

Function

Controls the left/right channel gains of this input to the analog mixer from +12 dB to −34.5 dB. The least significant bit

represents −1.5 dB.

L/RM

L/RV [4:0]

Function

Default

0 0000

12 dB gain

0 1000

0 dB

Default

1 1111

−34.5 dB attenuation

L/RV [4:0]

(Left/Right

Volume)

x xxxx

Mute

Enables additional gain to increase the microphone sensitivity. This controls the boost of both the MIC_1 and MIC_2 channels.

The nominal gain boost by default is 20 dB; however, MBG0 [1:0] bits (Register 0x76), allow changing the gain boost to 10 dB

or 30 dB if necessary.

M20

MGB0 [1:0]

Boost Gain

Default

0 dB gain

Default: disabled

20 dB gain

Default

10 dB gain

M20

(MIC_1/2

Gain

Boost)

x xxxx

Mute

L/RM

(Left/Right

Mute)

Mutes the left/right channels independently.

Default: muted (0x1)

Reserved.

Default: 0

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