RTL8773B Motherboard User Guide
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All Rights Reserved.
Figure 2-7 MIC2 connections for condenser microphone
MIC3 jack is used for microphone input. When used as electret condenser
microphone input, follow the steps:
1) Short J26 and J28.
2) Connect J29.1 with term 1(+) of microphone.
3) Connect J27.1 with term 2(-) of microphone as shown below. MIC3 interface begins to
sample voice signal through external microphone.
Figure 2-8 MIC3 connections for condenser microphone
For MEMS microphone application, use mic_bias for MEMS mic’s power supply,
and connect MIC+ to output of mems microphone as single-end input.
When U4 is used as aux line input, follow the steps:
1) Short J10.
2) Short J11.
3) Weld 0ohm resistor on position of R16 and R15. Connect TP1 to LDO_AUX2. When
inserting an aux line to Line-in jack, the voltage level of signal INS_DET goes down,
which means detection of aux line insertion is active-low.
Figure 2-9 Aux line in
Headphone jack is intended for headphone output. Connection of jumpers depends on
application. The following are the steps to perform single-end application:
1) Disconnect J12, J8 and J13. Connect J9.1 with J9.2. In this way, U3.1 is connected to
ground. SPKL_P and SPKR_P are transmitted through tantalum capacitors C9 and C6 to
daughterboard.
The following are the steps to perform cap-less application:
1) Short J12, and connect J9.3 with J9.2. SPKL_N and SPKR_N are connected together to
U3.1 for differential line.
2) Short J8 and J13. SPKL_P and SPKR_P are transmitted to daughterboard directly.
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