User's Manual

Smart Machine Smart Decision
SIM5320AL_User Manual_V1.01 2014-08-20
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3.4 Audio Interfaces (For SIM5320AL only）
SIM5320 provides two analog signal outputs and one analog input. MIC1P/N is used as microphone,
EAR1P/N and SPK_P/N are used as audio output. Regarding audio parameters configuration, please refer
to the ATC manual.
3.4.1 Pin Description
Table 9: Pin description
Audio channel Pin name Pin No. Function
Normal
MIC1P
23
MIC positive input
MIC1N
24
MIC negative input
EAR1P
26
Receiver positive output
EAR1N 25 Receiver negative output
Hand-free
MIC1P
23
MIC positive input
MIC1N
24
MIC negative input
SPK_P
22
Loudspeaker positive output
SPK_N 21 Loudspeaker negative output
Table 10: MIC input characteristics
Parameter Min Typ Max Unit
Working Voltage - 1.8 - V
Working Current 0.07 0.4 1 mA
External Microphone Load Resistance 1.2 2.2 k Ohms
Table 11: Audio output characteristics
Parameter Min Typ Max Unit
Normal
(EAR_P,EAR_N)
Differential
Load resistance
27
32
-
Ohm
Output power - 50 - mW
Table 12: Speaker output characteristics
Parameter Min Typ Max Unit
Quiescent Current - 2.5 4 mA
Load resistance - 8 - Ohm
Output power(1KHz) - 500 - mW
3.4.2 Design Guide
There are three audio channels in SIM5320，including speaker output , receiver output and microphone