AS3525-A/-B C22O22
Data Sheet, Confidential
7.4.11
Audio Output Mixer
7.4.11.1 General
The mixer stage sums up the audio signals of the following stages
•
•
•
•
•
Microphone Input 1
Microphone Input 2
Line Input 1
Line Input 2
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.
7.4.11.2 Register Description
Audio Mixer Related Register
Name
Base
Offset
Description
Enable/disable mixer stage
Enable/disable AGC
AudioSet_1
AudioSet_2
I2C audio master
I2C audio master
0x14
0x15
The mixer stage has no dedicated registers.
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