AD1986BSTZ-REEL 데이터 시트보기 (PDF) - Analog Devices

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AD1986BSTZ-REEL

AC ’97 SoundMAX CODEC

Analog Devices 

AD1986

Preliminary Technical Data

Table 35.

Register

V [4:0]

(Volume)

M (Mute)

x

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.

MV

[4:0]

Function

Default

0

0 0000

12 dB gain

0

0 1000

0 dB

Default

0

1 1111

−34.5 dB attenuation

1

x xxxx

Muted

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 nonmicrophone sources by disabling the microphone boost (M20 Bit = 0).

Reg Name

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default

0x0E Microphone LM x x LV4 LV3 LV2 LV1 LV0 RM M20 x RV4 RV3 RV2 RV1 RV0 0x8888

Volume

Table 36.

Register

L/RV [4:0]

(Left/Right

Volume)

M20

(MIC_1/2

Gain

Boost)

L/RM

(Left/Right

Mute)

x

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

0 0000

12 dB gain

0

0 1000

0 dB

Default

0

1 1111

−34.5 dB attenuation

1

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

0

xx

0 dB gain

Default: disabled

1

00

20 dB gain

Default

1

01

10 dB gain

1

x xxxx

Mute

Mutes the left/right channels independently.

Default: muted (0x1)

Reserved.

Default: 0

Rev. 0 | Page 20 of 52

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