Connector For The Voice Management - Digicom GSM Bulk User Manual

2.4 CONNECTOR FOR THE VOICE MANAGEMENT

For the voice functionality, GSM Bulk is equipped with two male connectors 2pin
lead-space 2.54
The modem includes AC coupling and biasing for electret microphone.
SNR (Signal to Noise Ratio): > 50dBm
Impedance of the speaker amplifier output in differential
mode is 1Ω ± 10%
[ For further information on the commands, see the chapter "AT Commands" ]
10
Suggested characteristics for the microphone
Biasing : 2V – 0.5mA
Impedance: 2KΩ
Sensitivity: from –40dBm to –50dBm
Suggested characteristics for the speaker
Impedance: 150Ω
Power: 10mW