Motorola Mobility LLC T56KT1 User Manual
Audio Interface
40
G30 - Module Hardware Description
December 15, 2009
•
Isolate the audio signals by a surrounding ground plane or shields.
•
Filter internal supplies and signals that may indirectly affect the audio circuits, from noises
and voltage drops.
and voltage drops.
Analog Ground
The G30 interface incorporates a dedicated analog ground contacts, AGND pads 52, 54 (of the 81
pin LGA interface), which are internally connected to the G30's ground. The AGND signal is
intended to provide a separate ground connection for the application's external audio devices and
circuits.
pin LGA interface), which are internally connected to the G30's ground. The AGND signal is
intended to provide a separate ground connection for the application's external audio devices and
circuits.
This signal provides an isolated ground connection directly from G30, which is separated from
the noisy digital ground of the application. It is recommended to connect this signal to analog
audio devices and circuits used by the application. Using a separate analog ground minimizes
audio noises and improves the audio circuit's immunity from external interferences.
the noisy digital ground of the application. It is recommended to connect this signal to analog
audio devices and circuits used by the application. Using a separate analog ground minimizes
audio noises and improves the audio circuit's immunity from external interferences.