User Manual

HE863 Family Hardware User Guide
1vv0300891 Rev.6
- 2011-04-14
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights
Reserved. Page 69 of 92
The OEM circuitry shall be designed to reduce the common mode
noise typically generated on the ground plane and to get the
maximum power output from the device (low resistance tracks).
(*) WARNING:
Using single ended configuration, the unused output line must
be left open.
Not respecting this constraint, the output stage will be
damaged.
DANGER:
Using HS/MT, the serial capacitors below 100nF must be
connected in the output lines.
The handsfree mode only supports single ended type and
reserved HF- Ball must be opened.
11.3.1. Output Lines Characteristic
Line coupling
differential
single-ended
DC
AC
Output load impedance
differential
16 
Signal bandwidth 150 - 4000 Hz @ -3
dB
Differential output voltage
(typ.)
3700 mV
pp
/Full scale
differential open
circuit voltage
Max Output Power
@ 16 
100mW
Output load resistance 14 
Table 3. “Ear_MT” Output (EAR_EPx1 differential amplifier)