User's Manual

UMTS/HSDPA Module Series
UC15 Hardware Design
UC15_Hardware_Design Confidential / Released 45 / 78
3.11.4. Earphone Interface Application
Figure 26: Reference Design for an Earphone
Table 14: Microphone Characteristics
Table 15: Speaker Characteristics
Parameter Min. Typ. Max. Unit
Working Voltage 1.65 1.8 1.95 V
Working Current 20 1000 uA
Parameter Min. Typ. Max. Unit
Normal Output
(AOUT1)
Differential
Supply voltage 2.0 2.1 2.2 V
Load resistance 25.6 32 ohm
Auxiliary Output
(AOUT2)
Single ended
Supply voltage 2.0 2.1 2.2 V
Load resistance 12 16 ohm
Output Power of AOUT1 and AOUT2 50 mW