SimCom SIM5320AL User Manual

Smart Machine Smart Decision
SIM5320AL_User Manual_V1.01 2014-08-20
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Figure 23: Microphone interface configuration
Note: SIM5320 has integrated MIC bias circuit. There is no need to pull the MIC1P and MIC1N up to the external power,
just connect it to microphone. MIC1P and MIC1N must be differential lines.
3.4.3 Audio Parameter Characteristic
Main audio parameters can be changed to satisfy users’ requirement. Here primary register parameters and
related description are listed. User can adjust them through AT command. For more detail please refers to
Audio Application Document.
Table 13: Audio parameter
Parameter Influence to Range Gain range Calculation AT command
micAmp1
MICP/MICN
analogue amplifier
gain before ADC
0…1 0…24dB 2 steps AT+CMICAMP1
txVol
Digital gain of input
signal after ADC
0,
1...65535
Mute,
-84...+12dB
20 * log
(txVol/
16384)
AT+CTXVOL
txGain
Digital gain of input
signal after
summation of
sidetone
0,
1...65535
Mute,
-84...+12dB
20 * log
(txGain/
16384)
AT+CTXGAIN
txFilter
Input PCM 13-tap
filter parameters, 7
values
0...65535 ---
MATLAB
calculate
AT+CTXFTR
rxGain
Digital gain of
output signal after
0,
1...65535
Mute,
-84...+12dB
20 * log
(rxGain/
AT+CRXGAIN

SimCom SIM5320AL Specifications

General

Brand	SimCom
Model	SIM5320AL
Category	Control Unit
Language	English