UMTS/HSDPA Module
UC15 Hardware Design
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Table 13: Typical electret
microphone characteristic
Parameter
MIN
Typ
Max
Unit
Working Voltage
1.65 1.8 1.95
V
Working Current
20
1500
uA
External Microphone
Load Resistance
2.2
kOhm
Table 14: Typical speaker characteristic
Parameter
MIN
Typ
Max
Unit
Normal
Output(SPK1)
Differential
Load resistance
25.6
32
Ohm
Ref
level
4.0 4.2 4.4
Vpp
Auxiliary
Output(SPK2)
Single
Ended
Load
resistance 12 16
Ohm
Ref
level
2.0 2.1 2.2
V
Maxim output power of SPK1 and SPK2
50
mW