Speaker Outputs - Wavecom FASTRACK M1306B User Manual

This electret microphone may be directly connected to these inputs allowing an easy
connection to a handset.
The microphone impedance must be around 2 kΩ.
AC coupling is already embedded in the Wireless CPU
The gain of the microphone inputs is internally adjusted and may be tuned from 30
dB to 51 dB using an
Signal
CMIC2P
CMIC2N

7.7.2 Speaker Outputs

This connection is differential to reject common mode noise and TDMA
Speaker outputs are connected to internal push-pull amplifiers and may be loaded
down between 32 to 150 Ohms and up to 1 nF (see details in table
Max output voltage,
directly connected to a speaker.
The output power may be adjusted by step of 2 dB. The gain of the speaker outputs
is internally adjusted and may be tuned using an
commands documentation [7]).
Signal
CSPK2P
CSPK2N
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WM_PRJ_M13_UGD_001 -003
command (refer to AT commands documentation [7]).
AT +VGT
Pin description
Sub D 15-pin I/O
Pin #
4 I
5 I
in "AT Commands Interface Guide" [7])
Pin description
Sub D 15-pin I/O
Pin #
10 O
15 O
Fastrack M1306B User Guide
Functional Description
®
.
I/O type Description
Analog Microphone positive input
Analog Microphone negative input
.
These outputs may be
command (refer to AT
AT +VGR
I/O type
Analog Speaker positive output
Analog Speaker negative output
noise.
Speaker gain vs
Description
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November 11, 2006