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AS3658F-BCTP Datasheet(PDF) 109 Page - ams AG

Part # AS3658F-BCTP
Description  Power and Audio Management Unit for Portable Devices
PDF  158 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3658F-BCTP Datasheet(HTML) 109 Page - ams AG

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www.austriamicrosystems.com
Revision 1v13
108 - 157
AS3658
Data Sheet Confidential - Detail ed Descri ption- Audio Functi ons
9.9
Audio Output Mixer
9.9.1 General
The mixer stage sums up the audio signals of the following stages
Microphone Input
Line Input
Digital Audio Input (DAC)
The mixing ratios have to be with the volume registers of the corresponding input stages. Please be sure that the input
signals of the mixer stage are not higher than 1Vp. If summing up several signals, each individual signal has of course
to be accordingly lower. This shall insure that the output signal is also not higher than 1Vp to get a proper signal for the
output amplifier.
This stage features an automatic gain control (AGC), which automatically avoids clipping.
9.9.2 Register Description
7
msup_off
0
R/W
0
microphone supply on if mic_on=1
1
microphone supply off
Table 113. AudioSet_3 Register
Addr:76
Audio_set3 register
Configures the mixer inputs and AGC
Bit
Bit Name
Default
Access
Description
0
pll_mode
0
R/W
Preset of PLL bias for the following sampling
frequencies
0
16-48kS
1
8-12kS
1
hp_pulld_en
0
R/W
Controls the pulldown of the HP1 if HP2is enabled and
HP2, if HP1 is enabled
0
Pulldown disabled if hp_on=1
1
Pulldown of the not used HP1/2 output
enabled, if hp_on=1
2
voxm_on
0
R/W
Switches on the voice recognition
0OFF
1ON
3
mic_on
0
R/W
Switches on the microphone amplifier
0OFF
1ON
Table 112. MIC_L Register
Addr:88
MIC_L
Left Microphone Input Register
Configures the gain from microphone amplifier output
Bit
Bit Name
Default
Access
Description



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