BGS3 Hardware Interface Description
5.7 Electrical Characteristics of the Voiceband Part
90
BGS3_HD_v01.000d
Page 88 of 109
2010-03-26
Confidential / Released
5.7.5
Voiceband Transmit Path
Test conditions:
•
The values specified below were tested to 1kHz and default audio mode settings, unless
otherwise stated.
•
Parameter setup: Audio mode=5 for MICP1 to MICN1 and 6 for MICP2 to MICN2, inBbc-
Gain=0, inCalibrate=32767, sideTone=0
Table 34:
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
1
0Hz - 100Hz
200Hz
300Hz - 3350Hz
3400Hz
4000Hz
>4400Hz
1. This is the frequency response from a highpass and lowpass filter combination in the DAC of the base-
band 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
-0.2
-1.1
-0.7
-39
-34
0.1
-75
dB
