Xircom An Intel Company GEM3501 User Manual
Core Engine GSM/GPRS Modem Developer Guide Preliminary Draft: 7/6/2001
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Part Number: 07100026, Revision: 002
Confidential
© 2001 Xircom, Inc., an Intel company All rights reserved.
All trademarks and copyrights are the property of Xircom, Inc., an Intel company
All trademarks and copyrights are the property of Xircom, Inc., an Intel company
7.4 Audio Circuit Implementation
7.4.1 Example Single-Ended Microphone Circuit
Figure 3 shows an example of how to implement a single ended microphone circuit
compatible with the Core Engine.
compatible with the Core Engine.
Figure 2: Single-Ended Microphone Circuit (Example)
NOTE: The FB1, FB2 and FB3 components are ferrite beads to suppress any energy
on to the headset cord. Component D3 is a transient surge suppressor to protect
against ESD.
on to the headset cord. Component D3 is a transient surge suppressor to protect
against ESD.