SARA-G450 - System integration manual
UBX-18046432 - R08 System description Page 44 of 143
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1.10 Audio interfaces
☞ Analog audio interface is not supported by the “00” product version. This interface should be left
unconnected and should not be driven by external devices.
SARA-G450 modules provides an analog audio interface:
Analog audio input:
o Differential analog audio input (MIC_P, MIC_N) shared for all the analog audio path modes: the
pins can be connected to the output of an external analog audio device or can be connected to
an external microphone by means of a simple circuit implemented on the application board
o Supply output for an external microphone (MIC_BIAS): the pin can provide the bias to an
external microphone by means of a simple circuit implemented on the application board
o Local ground for the external microphone (MIC_GND): the pin can provide the reference for the
differential analog audio input as sense ground line for the external microphone circuit
Analog audio output:
o Differential audio output (SPK_P, SPK_N) shared for all the analog audio path modes: the pins
can be connected to the input of an external analog audio device or can be connected to an
external speaker
1.10.1 Analog audio interface
☞ Analog audio interface is not supported by the “00” product version. This interface should be left
unconnected and should not be driven by external devices.
1.10.1.1 Uplink path
SARA-G450 pins related to the analog audio uplink path are:
MIC_P / MIC_N: differential analog audio signal inputs (positive/negative)
MIC_BIAS: supply output for an external microphone
MIC_GND: local ground for the external microphone
The SARA-G450 data sheet [1] provides the detailed electrical characteristics of the analog audio
uplink path.
1.10.1.2 Downlink path
SARA-G450 pins related to the analog audio downlink path are:
SPK_P / SPK_N: differential analog audio signal output (positive/negative)
The SARA-G450 data sheet [1] provides the detailed electrical characteristics of the analog audio
uplink path.
⚠ Excessive sound pressure from headphones can cause hearing loss.
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