User Manual

GSM/GPRS Module Series
GC10 Hardware Design
GC10_Hardware_Design Confidential / Released 46 / 76
3.8.4. Earphone Interface Design
Figure 31: Earphone Interface Design
3.8.5. Audio Characteristics
Table 9: Typical Electret Microphone Characteristics
Table 10: Typical Audio Output Characteristics
Parameter Min. Typ. Max. Unit
Working Voltage 1.2 1.5 2.0 V
Working Current 200 500 uA
External Microphone Load Resistance 2.2 kΩ
Parameter Min. Typ. Max. Unit
AOUT1
(SPK1)
Single-ended
Load resistance
16
Ω
Ref level 0 1.3 Vpp
Differential
Load resistance 16 Ω
Ref level 0 2.6 Vpp