User Guide

NMM-3 Company Confidential

7 - System Module & UI CCS Technical Documentation

Page 7-24 Copyright  2003 Nokia Corporation Issue 1 (11/2003)

Company Confidential

IHF speaker connections:

Internal Microphone

The internal microphone capsule is mounted in the C-cover. The microphone is omni

directional and is connected to UEME microphone inputs MIC1P and MIC1N. The micro-

phone input is asymmetric and the UEME (MICB1) provides a bias voltage. The audio

transmit path functional blocks included in UEME are:

• Microphone input stage

• Programmable gain stage

• Anti-aliasing lowpass filter

• Analog to digital converter

Spring contacts are used to connect the microphone to the engine PWB.

Internal Microphone connection:

Internal Speaker

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

fitted to the UI module. The earpiece is driven directly by UEME. UEME includes the same

functional blocks as the external earphone, but with a separate earpiece driver. The ear-

piece output from UEME is ESD protected.

UEME

D200

PAOUTP

PAOUTN

MICB1

UEME

D200

MIC1P

MIC1