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AC75 Hardware Interface Description
Strictly confidential / Preliminary
5.7.4 Voiceband Receive Path
Test conditions:
•
The values specified below were tested to 1kHz with default audio mode settings, unless
otherwise stated.
•
Default audio mode settings are: mode=5 for EPP1 to EPN1 and mode=6 for EPP2 to
EPN2, inBbcGain=0, inCalibrate=32767, outBbcGain=0, OutCalibrate=16384 (volume=4)
or OutCalibrate=11585 (volume=3), sideTone=0.
Table 32: Voiceband receive path
Parameter
Maximum differential
output voltage (peak to
peak)
EPP1 to EPN1
Maximum differential
output voltage (peak to
peak)
EPP2 to EPN2
Nominal differential output
voltage (peak to peak)
EPP1 to EPN1
Nominal differential output
voltage (peak to peak)
EPP1 to EPN1
Output bias voltage
Output bias voltage
Differential output gain
settings (gs) at 6dB stages
(outBbcGain)
Fine scaling by DSP
(outCalibrate)
Differential output load
resistance
Differential output load
resistance
Single ended output load
resistance
Single ended output load
resistance
Absolute gain error
12
Idle channel noise
Signal to noise and
13
distortion
11
Full scale of EPP2/EPN2 is lower than full scale of EPP1/EPN1 but the default gain is the same. 3.14dBm0 will
lead to clipping if the default gain is used.
12
The idle channel noise was measured with digital zero signal fed to decoder. This can be realized by setting
outCalibrate and sideTone to 0 during a call.
13
The test signal is a 1 kHz, 0 dbm0 sine wave.
AC75_HD_V00.202
Min
Typ
Max
6.0
6.2
4.0
4.2
4.2
4.3
2.8
2.9
Batt+/2
1.2
-18
0
-∞
0
7.5
8
27
32
7.5
8
27
32
-0.1
0.1
-83
-75
47
Page 99 of 120
Unit
Test condition / remark
V
8 Ω,
V
no load,
Audio Mode 5, Volume 4
@ 3.14 dBm0 (Full Scale)
Batt+ = 3.6V
V
32 Ω,
V
no load
Audio Mode 6, Volume 3
@ 3.14 dBm0 (Full Scale)
V
8 Ω,
V
no load,
Audio Mode 5, Volume 4
@ 0 dBm0 (Nominal level)
V
32 Ω,
V
no load
Audio Mode 6, Volume 3
@ 0 dBm0 (Nominal level)
V
from EPP1 or EPN1 to AGND
V
from EPP2 or EPN2 to AGND
dB
Set with AT^SNFO
dB
Set with AT^SNFO
Ω
From EPP1 to EPN1
Ω
From EPP2 to EPN2
Ω
From EPP1 or EPN1 to AGND
Ω
From EPP2 or EPN2 to AGND
dB
outBbcGain=2
dBm0p
outBbcGain=2
dB
outBbcGain=2
s
11
11
27.04.2006
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