AD1986BSTZ datasheet(39/52 Pages) AD

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Preliminary Technical Data

AD1986

Rev. 0 | Page 39 of 52

MISC CONTROL BITS 1 (REGISTER 0x76)

Reg

Name

D15

D14

D13

D12

D11

D10

Default

76h

Misc Control Bits 1

DACZ

AC97NC

MSPLT

SODIS

CLDIS

DMIX1

DMIX0

SPRD

2CMIC

SOSEL

SRU

LISEL1

LISEL0

MBG1

MBG0

6010

Table 63.

Function

These two bits allow changing both MIC preamp gain blocks from the nominal 20 dB gain boost. Both MIC_1/2

and MIC_2 preamps will be set to the same selected gain. This gain setting only takes affect while bit D6 (M20)

on the MIC volume register (0x0E) is set to 1, otherwise the MIC boost blocks have a gain of 0 dB.

MGB [1:0]

Microphone Boost Gain

Default

20 dB

Default

10 dB

30 dB

MBG [1:0]

(MIC Boost Gain Select

Reserved

Selects the source of the internal LINE_IN signals.

LISEL [1:0]

LINE_IN Selection

LINE_IN pins

Default

SURROUND pins—Places SURROUND outputs in Hi-Z state

LISEL [1:0]

(LINE_IN Selector)

MIC_1/2 pins

Controls all DAC sample rate locking.

SRU

Surround State

All DAC sample rates are locked to the front sample rate

SRU

(Sample Rate Unlock)

Front, surround and LFE sample rates can be set independently

Default

Selects either the surround DAC or analog mixer as the source driving the SURROUND output pin amplifier.

SOSEL

Surround Source

Surround DACs

Default

SOSEL

(Surround Amplifier

Input Selection)

Analog Mixer

2CMIC

(2-Channel MIC Select)

Used in conjunction with the OMS [2:0] (0x74 D10:08]), MS (0x20 D08), and MMIX (0x7A D02) bits to set the

microphone selection. This bit enables simultaneous recording from MIC_1 and MIC_2 inputs, using a stereo

microphone array. If the MMIX (0x7A D02) bit is set this bit is ignored.

2CMIC

2 Channel MIC State

Both outputs are driven by the left channel of the selector

Default

Stereo operation, the left and right channels are driven

separately

SPRD

(Spread Enable)

This bit enables spreading of 2-channel media to all 6-output channels. This function is implemented in the

analog section by using the output selector controls lines for the center/LFE, surround and LINE_OUT output

channels. The jack sense pins can also be setup to control (gate) this function depending on the JSSPRD bit (see

SPRD

Spread State

No spreading occurs unless activated by jack sense

Default

The SPDR selector drives the center and LFE outputs from the

MONO_OUT

CLDIS

(C/LFE Output Enable)

Controls the Hi-Z state of the SURROUND_L/R output pins. Pins are placed into a Hi-Z mode by software control

or when they are selected as inputs to the MIC_1/2 selector (see the OMS [2:0] bits 740x D [10:08]).

CLDIS

C/LFE Output State

Outputs enabled

Default

Outputs tristated

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