Fastrack Supreme User Guide
Functional Description
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7.8.2
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" [6])
.
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 [6]).
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