Sierra Wireless AIRPRIME WISMO218 - Manual (Page 52)

WA_DEV_W218_PTS_002 Rev 006 April 29, 2010 52
Product Technical Specification &
Customer Design Guidelines Interfaces
Figure 18. Example of MIC Input Single-Ended Connection without LC Filter
*Z2 is from 200Hz to 4kHz. For more characteristics refer to section 3.2.2 Electrical Characteristics.
The capacitor C1 is highly recommended to eliminate TDMA noise. Note that C1 must be close to the
microphone.
3.10.4.1.2.1. Recommended Components
Component Description/Details Notes
C1 12pF to 33pF needs to be tuned depending on the design
C2 needs to be tuned depending on the design
L1 needs to be tuned depending on the design
3.10.4.2. Speaker SPKP and SPKN
3.10.4.2.1. SPK Differential Connection
SPKP
SPKN
Figure 19. Example of Speaker Differential Connection