Rainbow-electronics GE863-PY Uživatelský manuál stáhnout pdf (Strana 49)

GE863 Hardware User Guide

1vv0300783 Rev.0 - 10/06/08

Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 49 of 80

7.1.2 Input Lines Characteristics

“MIC_MT” 1st differential microphone path

Line Coupling AC*

Line Type Balanced

Coupling capacitor ≥ 100nF

Differential input resistance 50kΩ

Differential input voltage ≤ 1,03V

pp

(365mV

rms

)

Microphone nominal sensitivity -45 dBV

rms

/Pa

Analog gain suggested + 20dB

Echo canceller type Handset

“MIC_HF” 2nd differential microphone path

Line Coupling AC*

Line Type Balanced

Coupling capacitor ≥ 100nF

Differential input resistance 50kΩ

Differential input voltage ≤ 65mV

pp

(23mV

rms

)

Microphone nominal sensitivity -45 dBV

rms

/Pa

Analog gain suggested +10dB

Echo canceller type Car kit hands-free

(*) WARNING: AC means that the signals from microphone has to be connected to input lines of the

module by a CAPACITOR, which value must be ≥ 100nF. Not respecting this constraint, the input stage

will be damaged.

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