2.4 Audio In/Audio Out
The only way of connecting the microphone/speaker is via pins 3 - 6 of the 12-pin connector.
Please follow the specifications as listed in the table
!
below. Security Concepts is not liable for damage to
the WorldTracker AVL due to user error.
Ear – Speaker Output:
Parameter
Conditions
MIN
TYP
MAX
UNIT
Maximum Input Range –
Mic(+) to Mic(-)
Nominal Ref. Level –
Mic(+) to Mic(-)
Differential Input
Resistance –
Mic(+) to Mic(-)
Microphone Pre-Amplifier
Gain
Inputs 3 dBm0 (Max. digital
sample amplitude when PGA
gain set to 0 dB)
dBm0
dB
32.5
mVrms
-10
100
k
Ω
25.6
Bias Voltage on Mic(+)
2.0 or 2.5 V
2.0
2.5
Vdc
Mic Bias Current Capability
0
0.5
mA
Handset Speaker Output
Parameter
Conditions
MIN
TYP
MAX UNIT
Maximum Swing –
Ear(+) to Ear(-)
Maximum Capacitive Load –
Ear(+) to Ear(-)
R
L
= 32
Ω
& 5% distortion
1.2 1.5
V
pp
100 pF
Amplifier Gain
1
dB
Amplifier State in Power Down
High Z
Table 2 - Audio Settings
