User Guide

NSM–5
UI section
PAMS Technical Documentation
Page 14
Issue 1 02/2002
 Nokia Corporation
Speaker
Speaker circuit includes pads for speaker and 2 capacitors, 2 ferrites for
EMC protection.
Speaker is sealed to A–cover with gasket and UI PWB with supporting
ring. With that the frequency response is more constant. Speaker does
not need holes for PWB. This gives reliable sound quality for the phone
and it can be estimated in several environments. Arrangement is not a
leak tolerant speaker.
The low impedance, dynamic type earphone is connected to a differential
output in the COBBA audio codec. The electrical specifications for the
earphone output are shown below. The voltage level at each output is giv-
en as reference to ground. Earphone levels are given to 32 ohm load.
Nominal Maximum Notes
COBBA output, differ-
ential, 6dB gain
17.6mV 788mV ENGINE – UI Interface; Esti-
mate, must be checked with final
earpiece construction
Earpiece sound pres-
sure (sensitivity
+28dBPa/V 1kHz)
–7dBPa +26dBPa Measured as shielded (in brack-
ets with leak ring)