User’s Manual
36 ECM-3610/3610L User’s Manual
3.7.21 Signal Description – Audio Connector (CN7)
Mic-In / Mic
Bias
The MIC signal is used for microphone input. This input is fed to the left microphone
channel.
Mic Bias provides 3.3V supplied through 3.2K Ω with capacitive decoupling to GND. This
signal may be used for bias of some microphone types.
Line-In L/R Left and right line in signals.
Line-Out L/R Left and right line out signals. Both signals are capacitor coupled and should have GND as
return.
3.7.22 CD-ROM Audio Input Connector (CN8)
Signal PIN
CD_GND
1
CD_L 2
CD_GND
3
CD_R 4
3.7.23 Signal Description – CD-ROM Audio Input Connector (CN8)
CD_L/R Left and right CD audio input lines.
CD_GND GND for left and right CD. This GND level is not connected to the board GND.
3.7.24 IrDA Connector (CN9)
Signal
PIN
VCC 1
NC 2
IRRX 3
GND 4
IRTX 5
3.7.25 Signal Description – IrDA Connector (CN9)
IRRX Infrared Receiver input
IRTX Infrared Transmitter output
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