Sierra Wireless airprime wismo218 User Manual
WA_DEV_W218_PTS_002
Rev 005
Page 55 of 109
Product Technical Specification &
Customer Design Guidelines
Figure 18. Example of MIC Input Single-Ended Connection without LC Filter
*Z2 is from 200Hz to 4kHz. For more characteristics refer to the Electrical Characteristics section.
The capacitor C1 is highly recommended to eliminate TDMA noise. Note that C1 must be close to the
microphone.
microphone.
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