Cinterion MC55i - Audio Interface; Table 19: Audio Interface Specifications (Requirements)

MC55i Terminal Hardware Interface Description
4.4 Electrical Specifications of the Application Interface
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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
0V
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
042dB
Frequency range 300 3400 Hz
Earpiece
EPP, EPN
Fine scaling by DSP (inCalibrate) -
 0dB
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
1dB
Out-of-band discrimination 60 dB