AD1986A Analog Devices, AD1986A Datasheet - Page 46

• Manufacturer Part Number: AD1986A
• Description: HD Audio SoundMAX Codec
• Manufacturer: Analog Devices

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AD1986A
Register
LOHPEN
LVREF [2:0]
(Line In
VREF_OUT)
LOSEL
(LINE_OUT
Amplifiers
Input Select)
JSINVA
Jack Sense
Invert
HPSEL [1:0]
(Headphone
Amplifier
Input Select)
4
Function
Enables the headphone drive on the LINE_OUT pins. Disabling the headphone drive is the same as powering it down (see
the PR6 bit (0x26 D14)).
LOHPEN
0
1
Sets the voltage/state of the LINE_IN VREF_OUT signal. VREF_OUT is used to power microphone style devices plugged into
the connected jack circuitry. The VREF_OUT pin must be connected to both the left and right channels through external
resistors to function properly. Selections other than those defined are invalid and should not be programmed.
LVREF
[2:0]
000
001
010
100
This bit allows the LINE_OUT output amplifiers to be driven by the mixer or the surround DACs. The main purpose for this is
to allow swapping of the front and surround channels to make better use of the SURR/HP_OUT output amplifiers. This bit
should normally be used in tandem with the HPSEL bit (following in table).
LOSEL
0
1
SENSE_A: Select the style of switch used on the audio jacks connected to Sense A.
JSINVA
0
1
This bit allows the headphone power amps to be driven from the surround DACs, C/LFE DACs, or from the mixer outputs.
HPSEL
[1:0]
00
01
1x
Function
LINE_OUT
headphone drive
is disabled
LINE_OUT
headphone drive
is enabled
LINE_IN VREF_OUT Setting
5.0 AV
Hi-Z
2.25 V
0V
3.70 V
LINE_OUT Select
LINE_OUT
amplifiers are
driven by the
analog mixer
outputs
LINE_OUT
amplifiers are
driven by the
surround DAC
Jack Sense Invert—SENSE_A
SENSE_A
configured for
normally-open
(NO) switches
SENSE_A
configured for
normally-closed
(NC) switches
HP_OUT Selection
Outputs are
driven by the
mixer outputs
Outputs are
driven by the
surround DACs
Outputs are
driven by the
C/LFE DACs
DD
Default
Default
Default
Default
Default
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