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2. SYSTEM CONNECTOR INTERFACE
45
LZT 123 7263 R1C
2.3 Grounds
There are two ground connections in the GM47, AGND (analogue
ground) and DGND (digital ground). Pin assignments are shown in the
table above.
Note! AGND and DGND are connected at a star point inside the module. They
must not be joined together in your application.
2.3.1 Analogue Ground - AGND
AGND is the return signal, or analogue audio reference, for ATMS
(Audio To Mobile Station) and AFMS (Audio From Mobile Station).
2.3.2 Digital Ground - DGND
DGND is the reference or return signal for all system interface digital
signals and is also the d.c. return for SERVICE and the power supply,
VCC. Connect all DGND pins together in your application in order to
carry the current drawn by the module.
2.4 VCC - Regulated Power Supply Input
Power is supplied to the module VCC pins, from an external source.
Connect all VCC pins together in your application in order to carry the
current drawn by the module.
Pin Signal Description
2, 4, 6, 8, 10, 12 DGND Digital ground
60 AGND Analogue ground
Parameter Limit
I
max
≅12.5mA
Pins Signal Description
1, 3, 5, 7, 9, 11 VCC regulated power supply input