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through the microphone input signals and then are amplified by the G610's internal audio amplifiers.
To minimize the audio noise and improve the audio performance the microphone and speaker
signals must be designed with sufficient protection from surrounding noises.
The following guidelines should be followed to achieve best audio performance:
Reference the microphone input circuits to the G610 AGND interface signal.
If using single-ended audio outputs, they should be referenced to the G610 AGND
interface signal.
Keep the audio circuits away from the antenna.
Use RF filtering capacitors on the audio signals.
The audio signals should not be routed adjacent to digital signals.
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.
3.9.6 Switch Audio Channel by IO
The G610 support switch audio channel by IO pin. The default level of this pin is high. This IO
pin is took effect under 1st channel is activated.
When the IO is pulled low, the audio channel will be switched from 1st channel to 2nd channel
automatically. When the IO level is back to High, the audio channel will be back to 1st channel.
If the audio 2nd channel is activated, this PIN will not do any effect at all.
G610 Pin#
47
Notes：
After the MAPATH command was switch the audio channel, this PIN will not do any
effect at all.
3.10 A/D Interface
The G610 includes 3 Analog to Digital Converter (ADC) (2 ADC and 1 BATT ADC ) signals with
12-bit resolution, for environmental and electrical measurements. The ADC signals accept an
analog DC voltage level on their inputs and convert it to a 12-bit digital value for further processing
by G610 or the user application.
In Idle mode, the ADC input is sampled consecutive times by sampling time interval, and the
G610 GPRS Module Hardware User Manual
G610 Signal name
HS_DET
Description
1st channel is activated.
Level = Low, the 2nd channel is activated
Level = High, back to the 1st channel
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