Audio Mixer Input (Pins 49, 56) - Enfora Enabler III-G Integration Manual

Enfora Enabler III-G
Modem Integration Guide

6.6.29. Audio Mixer input (Pins 49, 56)

The mono FM input (mono FM - VMID) can be amplified by the auxiliary amplifier. This amplifier has a
gain of 4.9 dB. The stereo FM inputs can be amplified as well. The FM right channel is amplified by the
auxiliary amplifier (FM R - VMID) and the left channel by the handset microphone amplifier (FM L - VMID).
The gains are of 4.9 dB. This output is not connected to the ADC input, like the other outputs, but to an
audio output stage through a logarithmic PGA gain stage.
If the analog input is a stereo signal, the FML input corresponds to the analog left channel input and the
FMR/AUXI input corresponds to the analog right channel input.
If the analog input is a mono signal, the FMR/AUXI input has to be used only.
PARAMETER
Maximum Input Range
FML
Maximum Input Range
FMR (= AUXI)
Nominal Reference
Level at FML
Nominal Reference
Level at (AUXI/FMR)
Micro Amplifier Gain for
FML input
Auxiliary Amplifier Gain
for AUXI/FMR input
Input Resistance at
AUXI/FMR
Input resistance at FML
GSM0308PB001
Parameter/Conditions
Inputs 3 dBm0 (Maximum
digital sample amplitude with
PGA gain set to 0 dB),
MICAMP gain = 4.9 dB, Single
FML
Inputs 3 dBm0 (Maximum
digital sample amplitude with
PGA gain set to 0 dB),
AUXAMP gain = 4.9 dB, Single
FMR (AUXI)
Nominal reference level at FML
Single AUXI/FMR
Single FML input for FM Stereo
(INMODE = 0100)
Single AUXIFMR input for FM
Stereo (INMODE = 0100)
Single AUXI input, low gain
(INMODE = 0110)
Single AUXI input, high gain
(INMODE = 0111)
Single AUXI input, AUXAMP
gain = 4.9 dB
Single AUXI input, AUXAMP
gain = 28.2 dB (INMODE =
0111)
FM Mono (INMODE = 1000),
AUXAMP gain = 4.9 dB
FM Stereo (INMODE = 0100),
AUXAMP gain from 2.9 dB to
18.9 dB
FM Stereo (INMODE = 0100),
MICAMP gain from 2.9dB to
18.9 dB
55
Min Typ Max
353
353
-10
-10
4.9
4.9
4.9
28.2
130.5
13.5
130.5
36
36
Version DRAFT – 2/9/2007
Units
mVrms
mVrms
dBm0
dBm0
dB
dB
dB
dB
kΩ
kΩ
kΩ
kΩ
kΩ