GE863-PRO3Hardware User Guide

1vv0300773a Rev. 0 - 24/01/08

8.2 OUTPUT LINES (Speaker)

8.2.1 Short description

The Telit GE863-PRO3provides two audio paths in receive section. Only one of the two paths can be active at a time, selectable by AXE hardware line or by AT command.

You must keep in mind the different audio characteristics of the receive blocks when designing:

Æthe EAR_MTlines EPN1 and EPP1 are the Differential Line-Out Drivers ; they can drive an external amplifier or directly a 16 Ω earpiece at –12dBFS (*) ;

Æthe “EAR_HFlines EPPA1_2 and EPPA2 are the Fully Differential Power Buffers ; they can directly drive a 16speaker in differential (balanced) or single ended (unbalanced) operation mode .

(*)FS : acronym of Full Scale. It is equal to 0dB, the maximum Hardware Analog Receive Gain of BaseBand Chip.

The EAR_MTaudio path should be used for handset function, while the “EAR_HFaudio path is suited for hands-free function (car kit).

Both receiver outputs are B.T.L. type (Bridged Tie Load) and the OEM circuitry shall be designed bridged to reduce the common mode noise typically generated on the ground plane and to get the maximum power output from the device; however also a single ended circuitry can be designed for particular OEM application needs.

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Telit Wireless Solutions 1vv0300773a manual Output Lines Speaker

1vv0300773a specifications

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