User's Manual
Table Of Contents
- 1 Overview
- 2 GE864-QUAD V2 Mechanical Dimensions
- 3 GE864-QUAD V2 module connections
- 4 Hardware Commands
- 5 Power Supply
- 6 Antenna
- 7 Logic level specifications
- 8 Serial Ports
- 9 Audio Section Overview
- 10 General Purpose I/O
- 10.1 GPIO Logic levels
- 10.2 Using a GPIO Pad as INPUT
- 10.3 Using a GPIO Pad as OUTPUT
- 10.4 Using the RF Transmission Control GPIO4
- 10.5 Using the RFTXMON Output GPIO5
- 10.6 Using the Alarm Output GPIO6
- 10.7 Using the Buzzer Output GPIO7
- 10.8 Indication of network service availability
- 10.9 RTC Bypass out
- 10.10 External SIM Holder Implementation
- 11 DAC and ADC section
- 12 Conformity Assessment Issues
- 14 Document Change Log
GE864-QUAD V2 Hardware User Guide
1vv0300841 Rev.0.1 24/11/09
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 44 of 65
9.2.2 Output Lines Characteristics
“EAR_MT” Differential Line-out Drivers Path
Line Coupling DC
Line Type Bridged
Output load resistance ≥ 14 Ω
Internal output resistance 4 Ω (typical)
Signal bandwidth 150 – 4000 Hz @ -3 dB
Differential output voltage 328mVrms /16 Ω @ -12dBFS
SW volume level step - 2 dB
Number of SW volume steps 10
“EAR_HF” Power Buffers Path
Line Coupling DC
Line Type Bridged
Output load resistance ≥ 14 Ω
Internal output resistance 4 Ω ( >1,7 Ω )
Signal bandwidth 150 – 4000 Hz @ -3 dB
Max Differential output voltage 1310 mV
rms
(typ, open circuit)
Max Single Ended output voltage 656 mV
rms
(typ, open circuit)
SW volume level step - 2 dB
Number of SW volume steps 10
For more detailed information about audio please refer to the Audio Settings Application Note
80000NT10007a.