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AD1986AJCP Fiches technique(PDF) 46 Page - Analog Devices

No de pièce AD1986AJCP
Description  AC ??7 and HD Audio SoundMAX Codec
Download  56 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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AD1986AJCP Fiches technique(HTML) 46 Page - Analog Devices

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AD1986A
Rev. 0 | Page 46 of 56
Register
Function
LOHPEN
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
Function
0
LINE_OUT
headphone drive
is disabled
Default
1
LINE_OUT
headphone drive
is enabled
LVREF [2:0]
(Line In
VREF_OUT)
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.
LINE_IN VREF_OUT Setting
LVREF
[2:0]
5.0 AVDD
000
Hi-Z
Default
001
2.25 V
010
0V
100
3.70 V
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
(LINE_OUT
Amplifiers
Input Select)
LOSEL
LINE_OUT Select
0
LINE_OUT
amplifiers are
driven by the
analog mixer
outputs
Default
1
LINE_OUT
amplifiers are
driven by the
surround DAC
SENSE_A: Select the style of switch used on the audio jacks connected to Sense A.
JSINVA
Jack Sense
Invert
JSINVA
Jack Sense Invert—SENSE_A
0
SENSE_A
configured for
normally-open
(NO) switches
Default
1
SENSE_A
configured for
normally-closed
(NC) switches
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]
HP_OUT Selection
00
Outputs are
driven by the
mixer outputs
Default
01
Outputs are
driven by the
surround DACs
HPSEL [1:0]
(Headphone
Amplifier
Input Select)
1x
Outputs are
driven by the
C/LFE DACs


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