User's Manual

MC46 Hardware Interface Description
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MC46_HD_V03.05 Page 83 of 99 13.11.2003
5.5.5 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 32: Voiceband transmit path
Parameter Min Typ Max Unit Test condition/Remark
Input voltage (peak to peak)
MICP1 to MICN1, MICP2 to
MICN2
1.03 V
Input amplifier gain in 6dB steps
(inBbcGain)
0 42 dB Set with AT^SNFI
Fine scaling by DSP (inCalibrate) -$ 0 dB Set with AT^SNFI
Input impedance MIC1 50 k"
Input impedance MIC2 2.0 k"
Microphone supply voltage ON
Ri = 4k" (MIC2 only)
2.57
2.17
1.77
2.65
2.25
1.85
2.73
2.33
1.93
V
V
V
no supply current
@ 100µA
@ 200µA
Microphone supply voltage OFF
Ri = 4k" (MIC2 only)
0 V
Microphone supply in POWER
DOWN mode
See Figure 17