AD1986ABSTZ datasheet(44/56 Pages) AD

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AD1986A

Rev. 0 | Page 44 of 56

Function

DMIX [1:0]

(DOWN MIX Mode

Select)

Provides analog down-mixing of the center, LFE, and/or surround channels into the mixer channels. This allows

the full content of 5.1 or quad media to be played through stereo headphones or speakers. The jack sense pins

can also be set up to control (gate) this function depending on the JS0DMx and JS1DMx Bits (0x72 D [14:13]).

DMIX [1:0]

Down-Mix State

Default

No down-mix unless activated by jack sense

Default

Selects 6-to-4 down mix. The center and LFE channels are

summed equally into the Mixer L/R channels

Selects 6-to-2 down mix. In addition to the center and LFE

channels, the SURROUND channels are summed into the

mixer L/R channels

Controls the Hi-Z state of the SURROUND output pins. Pins are placed into a Hi-Z mode by software control or

when they are selected as inputs to the LINE_IN selector (see the LISEL [1:0] bits 0x76 D [03:02]).

CLDIS

SURROUND_OUT State

Outputs enabled

Default

SODIS

(Surround Output

Enable)

Outputs three-stated (Hi-Z)

MSPLT (RO)

(Mute Split)

Separates the left and right mutes on all volume registers. This bit is read-only 1 (one) on the AD1986A,

indicating that mute split is always enabled.

AC ‘97NC (RO)

(AC ‘97 No Compatibility

Mode)

Changes addressing to ADI model (vs. true AC ’97 definition). This bit is read-only 1 (one) on the AD1986A,

indicating that ADI addressing is always enabled.

Determines DAC data fill under starved condition.

DACZ

DAC Fill State

DAC data is repeated when DACs are starved for data

Default

DACZ

(DAC Zero-Fill)

DAC data is zero-filled when DACs are starved for data

Reserved.

Default: 0

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