User's Manual

AC65/AC75 Hardware Interface Description
Confidential / Preliminary
s
AC65/AC75_hd_v00.372 Page 99 of 118 2006-08-03
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 Min Typ Max Unit Test condition / remark
Maximum differential
output voltage (peak to
peak)
EPP1 to EPN1
6.0
6.2
V
V
8 ,
no load,
Audio Mode 5, Volume 4
@ 3.14 dBm0 (Full Scale)
Batt+ = 3.6V
Maximum differential
output voltage (peak to
peak)
EPP2 to EPN2
4.0
4.2
V
V
32 ,
no load
Audio Mode 6, Volume 3
13
@ 3.14 dBm0 (Full Scale)
Nominal differential output
voltage (peak to peak)
EPP1 to EPN1
4.2
4.3
V
V
8 ,
no load,
Audio Mode 5, Volume 4
@ 0 dBm0 (Nominal level)
Nominal differential output
voltage (peak to peak)
EPP1 to EPN1
2.8
2.9
V
V
32 ,
no load
Audio Mode 6, Volume 3
13
@ 0 dBm0 (Nominal level)
Output bias voltage Batt+/2 V from EPP1 or EPN1 to AGND
Output bias voltage 1.2 V from EPP2 or EPN2 to AGND
Differential output gain
settings (gs) at 6dB stages
(outBbcGain)
-18 0 dB Set with AT^SNFO
Fine scaling by DSP
(outCalibrate)
- 0 dB Set with AT^SNFO
Differential output load
resistance
7.5 8  From EPP1 to EPN1
Differential output load
resistance
27 32  From EPP2 to EPN2
Single ended output load
resistance
7.5 8  From EPP1 or EPN1 to AGND
Single ended output load
resistance
27 32  From EPP2 or EPN2 to AGND
Absolute gain error -0.1 0.1 dB outBbcGain=2
Idle channel noise
14
-83 -75 dBm0p outBbcGain=2
Signal to noise and
distortion
15
47 dB outBbcGain=2
13
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.
14
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.
15
The test signal is a 1 kHz, 0 dbm0 sine wave.