User Guide

Audio concept

Audio HW architecture

The functional core of the audio hardware is built around two ASICs: Rapido engine ASIC and the mixed signal

ASIC AVilma. AVilma provides an interface for the transducers and the accessory connector. Because audio

amplifiers are also integrated into the ASIC, the only discrete electronics components needed for audio paths

are audio filtering components and EMC/ESD components.

There are three audio transducers:

• Dynamic earpiece

• Dynamic IHF speaker

• Microphone

In addition to the audio transducers, AVilma also provides an output for the dynamic vibra component. All

galvanic audio accessories are connected to the AV accessory connector A Bluetooth audio and FM radio

module, which is connected to the Rapido ASIC supports Bluetooth audio and FM radio functionality.

Figure 112 Audio block diagram

Internal microphone

The internal microphone is used for HandPortable (HP) and Internal HandsFree (IHF) call modes.

An analogue electret microphone is connected to EM ASIC’s (N2200) Mic1P input via asymmetric electrical

connection.

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