Voiceband Transmit Path; Table 33: Voiceband Transmit Path - Siemens MC45 Manual

MC45 Hardware Interface Description
P R E L I M I N A R Y

6.5.5 Voiceband transmit path

Test conditions:
·
The values specified below were tested to 1kHz and 0dB gain stage, unless otherwise
stated.
·
Parameter setup: Audio mode = 5 for MICP1 to MICN1 and 6 for MICP2 to MICN2,
inBbcGain= 0, inCalibrate = 32767, outBbcGain = 0, OutCalibrate = 16384, sideTone = 0

Table 33: Voiceband transmit path

Parameter
Input voltage (peak to peak)
MICP1 to MICN1, MICP2 to
MICN2
Input amplifier gain in 6dB steps
(inBbcGain)
Fine scaling by DSP (inCalibrate)
Input impedance MIC1
Input impedance MIC2
Microphone supply voltage ON
Ri = 4kΩ
Microphone supply voltage OFF ;
Ri = 4kΩ
Microphone supply in POWER
DOWN mode
MC45_HD_01_V00.02a
Min Typ Max
1.03
0 42
-∞ 0
50
2.0
2.57 2.65 2.73
2.17 2.25 2.33
1.77 1.85 1.93
0
Page 85 of 90
Unit Test condition/Remark
V
dB Set with AT^SNFI
dB Set with AT^SNFI
kΩ
kΩ
V no supply current
V @ 100µA
V @ 200µA
V
See Figure 17
12.08.2002