Siemens AC75, Hardware Interface Description, Page: 100 / 120

AC75 Hardware Interface Description
Strictly confidential / Preliminary
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AC75_HD_V00.202 Page 100 of 120 27.04.2006
Parameter Min Typ Max Unit Test condition / remark
Frequency Response
14
0Hz - 100Hz
200Hz
300Hz - 3350Hz
3400Hz
4000Hz
≥ 4400Hz
-0.2
-1.1
-0.7
-39
-34
0.1
-75 dB
gs = gain setting
5.7.5 Voiceband Transmit Path
Test conditions:
•
The values specified below were tested to 1kHz and default settings of audio modes,
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 Min Typ Max Unit Test condition / Remark
Full scale input voltage (peak to peak)
for 3.14dBm0
MICP1 to MICN1 or AGND, MICP2 to
MICN2 or AGND
1.6 V MICPx must be biased with
1.25V (VMIC/2)
Nominal input voltage (peak to peak)
for 0dBm0
MICP1 to MICN1 or AGND, MICP2 to
MICN2 or AGND
1.1 V MICPx must be biased with
1.25V (VMIC/2)
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
Microphone supply voltage VMIC 2.4 2.5 2.6 V
VMIC current 2 mA
Idle channel noise -83 -76 dBm0p
Signal to noise and distortion 70 77 dB
Frequency response
14
0Hz - 100Hz
200Hz
300Hz - 3350Hz
3400Hz
4000Hz
≥ 4400Hz
-0.2
-1.1
-0.7
-39
-34
0.1
-75 dB
14
This is the frequency response from a highpass and lowpass filter combination in the DAC of the baseband chip
set. If the PCM interface is used, this filter is not involved in the audio path. Audio mode 1 to 4 incorporate
additional frequency response correction filters in the digital signal processing unit and are adjusted to their
dedicated audio devices (see Table 31).