User Guide

Issue 1 04/2005 COMPANY CONFIDENTIAL 19

RM-94

7 - System Module Nokia Customer Care

Figure 5:Internal microphone connection

Internal speaker

The internal earpiece is a dynamic earpiece with an impedance of 32 ohms. The earpiece is

low impedance one since the sound pressure is to be generated using current and not voltage

as the supply voltage is restricted to 2.7V. The earpiece is driven directly by the UEMEK and

the earpiece driver (EARP & EARN outputs) is a fully differential bridge amplifier with 6 dB gain.

Figure 6:Speaker connection