Motorola Mobility LLC T56KT1 User Manual
Chapter 2: Hardware Interface Description
December 15, 2009
G30 - Module Hardware Description
29
Audio Interface
The G30 audio interface supports several audio devices and operating modes.
The audio interface's operating modes, active devices, amplification levels and speech processing
algorithms are fully controlled by the host application, through advanced programming options
and a versatile AT commands set.
algorithms are fully controlled by the host application, through advanced programming options
and a versatile AT commands set.
The G30 supports the following audio devices:
•
Two single-ended and biased mono analog microphone inputs for use in a variety of modes.
•
A single differential mono analog speaker output for use in a variety of modes.
•
A digital serial interface using I
2
S coding.
•
A single-ended mono analog speaker output for use in a variety of modes.
Figure 2-13: Audio Interface Topology
Handset Microphone Port
The handset microphone port is the G30 power-up default active audio input for voice calls. It is
located on pin 51 at the G30 81 pin LGA interface, named MIC.
located on pin 51 at the G30 81 pin LGA interface, named MIC.
It is designed as a single-ended input and should be referenced to the G30 analog ground.
The microphone input includes all the necessary circuitry to support a direct connection to an
external microphone device. It incorporates an internal bias voltage of 2.0V through a 3kΩ
resistor, and has an impedance of 1kΩ.
external microphone device. It incorporates an internal bias voltage of 2.0V through a 3kΩ
resistor, and has an impedance of 1kΩ.