User guide
Table Of Contents
- Presentation
- Warning
- Copyright
- 1 References
- 2 Packaging
- 3 General presentation
- 4 Characteristics and Services
- 5 Use of the modem
- 5.1 Starting with the modem
- 5.2 Specific recommendations for the use of the modem in vehicles
- 5.3 GSM led of the modem
- 5.4 Echo function of AT commands deactivated
- 5.5 Checking the quality of the GSM reception signal
- 5.6 Verification of PIN code
- 5.7 Verification of modem registration on GSM network
- 5.8 Verification of modem registration on GPRS network
- 5.9 Verification of internal voltages of the modem
- 5.10 Main AT commands (HAYES)
- 5.11 Turning OFF the modem
- 5.12 Updating procedure of the modem
- 6 Trouble Shooting
- 7 Functional description
- 8 Technical characteristics
- 8.1 Mechanical characteristics
- 8.2 Electrical characteristics
- 8.3 Environmental characteristics
- 8.4 Standards/Conformities
- 9 Security recommendations
- 10 Recommended accessories
- 11 Client support
EG_GenPro25e_1055_UG_000_UK Page 56 / 66
Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modification.
Dct_427_01
8.2.4.2 Loudspeaker
By default, the loudspeaker output is not active.
For more details, see the command AT+USPM. This output corresponds to SPK_P and
SPK_N of the documentation.
Table 35 : Characteristics of the output for the loudspeaker
Speaker Output Parameter/Conditions Min Typ Max Units
Maximum differential output
voltage
Overdrive Gain stage = +9 dB 7.8
V
PP
Common mode output voltage 1.6 V
Output load resistance 8
Single-ended output load
capacitance
10 nF
Inductive load 400 µH
Signal to noise
Load = 16 ,
Gain stage = +0 dB,
Input signal = 0 dBFS,
Code 0, A-weighted
70 80 dB
Signal to distortion (THD) Load = 8 , 350 mW 50 dB
Power supply rejection 1 kHz 60 dB
If not precised, the parameters are measured in the frequency band 20 Hz,...,20 kHz.
Figure 25 : loudspeaker output
Component Value
C1, C2, C3 CONDENSER 22pF