MC55i Terminal Hardware Interface Description
4.4 Electrical Specifications of the Application Interface
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MC55i_Terminal_HD_v01.201a
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2010-04-16
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4.4.3
Audio Interface
•
Unless otherwise stated, all specified values are valid for gain setting (gs) 0dB and 1kHz
test signal.
•
gs = 0dB means audio mode = 5 for EPP to EPN, inBbcGain= 0, inCalibrate = 32767, out-
BbcGain = 0, OutCalibrate = 16384, sideTone = 0.
Table 19:
Audio interface specifications (requirements)
Parameter
Min.
Typ.
Max.
Unit
Microphone
MICP, MICN
DC (no load) at MICP
5.6
5.9
6.2
DC at MICP
in POWER DOWN
0
V
DC (no load) at MICN
0
V
DC resistance differential
MICN, MICP (balanced)
9.3
9.4
9.5
kOhm
Impedance
Z
i
(balanced)
4.0
4.3
4.6
kOhm
Input level
U
imax
1.03
V
PP
Gain range
6 dB steps
0
42
dB
Frequency range
300
3400
Hz
Earpiece
EPP, EPN
Fine scaling by DSP (inCalibrate)
-
0
dB
Impedance (audio not active)
30
kOhm
Impedance
(balanced)
15
Ohm
AC output level U
O
Gain
= 0dB @ 3.14 dBm0
no load
audio mode = 5,
outBbcGain = 0,
outCalibrate = 32767
3.3
3.7
4.07
V
PP
Gain range
-18
0
dB
Gain accuracy
0.8
dB
Frequency area
300
3400
Hz
DC Offset
(balanced)
100
mV
Attenuation distortion
for 300...3900Hz
1
dB
Out-of-band discrimination
60
dB
