DISCO-B4-GLONASS H
ARDWARE
M
ANUAL
V
ERSION
1.0.3
6.4 Audio jacks
DISCO-B4-GLONASS has two audio jack connectors one for an active speaker and one microphone.
Both connectors are shown in figure below:
Figure 16:
Audio interfaces
The electrical characteristics for both paths is given separately in tables below:
Microphone path characteristic and requirements:
Microphone type
Electret microphone
Line coupling
AC
Line type
balanced
Differential input voltage
≤ 65mVpp (23mVrms)
Microphone nominal sensitivity
-45 dBVrms/Pa
Analog gain suggested
+10dB
Microphone voltage
3 V
Table 8:
Microphone characteristics
Speaker path characteristic and requirements:
Line coupling
DC
Line type
balanced
Output load resistance
14
Internal output resistance
4 (>1.7)
Signal bandwidth
150 - 4000 Hz @ -3 dB
Max. differential output voltage
1310 mVrms (typ, open circuit)
Max. single ended output voltage
656 mVrms (typ, open circuit)
Amplifier
Audio power amplifier
5-10 W
Input voltage range
6 ... 30 VDC
Table 9:
Speaker characteristics
Detailed instructions on using audio parameters are presented in the manual
"
AVL_PFAL_Configuration_Command_Set.pdf"
.
This confidential document is a property of FALCOM and may not be copied or circulated without previous permission.
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