Fastrack M1306B User Guide
Functional Description
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WM_PRJ_M13_UGD_001 -003 November 11, 2006
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
AT +VGT command (refer to AT commands documentation [7]).
Pin description
Signal Sub D 15-pin
Pin #
I/O I/O type Description
CMIC2P 4 I Analog Microphone positive input
CMIC2N 5 I Analog Microphone negative input
7.7.2 Speaker Outputs
This connection is differential to reject common mode noise and TDMA noise.
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
Speaker gain vs
Max output voltage,
in "AT Commands Interface Guide" [7])
.
These outputs may be
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
AT +VGR command (refer to AT
commands documentation [7]).
Pin description
Signal Sub D 15-pin
Pin #
I/O I/O type Description
CSPK2P 10 O Analog Speaker positive output
CSPK2N 15 O Analog Speaker negative output
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