Nokia 5140 Manuales De Servicio
Nokia Customer Care
System Module and User Interface
NPL-4/5
Issue 1 05/04
Copyright © 2004 Nokia Corporation. All rights reserved.
Page 71
Internal speaker
There is a dynamic earpiece with 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.
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 33: IEarpiece Connection
IHF
The NPL-4/5 uses the D-class amplifier to gain signal to IHF speaker. The integrated
Hands Free Speaker is used to generate polyphonic ringing tones, FM radio, PoC and IHF
audios. Speaker capsule is mounted under the antenna. Spring contacts are used to con-
nect the IHF Speaker contacts to the system PWB.
Hands Free Speaker is used to generate polyphonic ringing tones, FM radio, PoC and IHF
audios. Speaker capsule is mounted under the antenna. Spring contacts are used to con-
nect the IHF Speaker contacts to the system PWB.
Class-D amplifier, it produces high efficiency, which leads to the lower current consump-
tion and makes the thermal issues negligible as well compared to the traditional solu-
tions.
tion and makes the thermal issues negligible as well compared to the traditional solu-
tions.
Figure 34: IHF Connection
1000
Ω@100MHz
EARP
EARN
UEMEk
14V
14V
27pF
27pF
UPP
UEMEk
LM4667
IN+
IN-
PAOUTP
PAOUTN
10n
10n GAINSEL
SHUTDOWN
V01
V02
GenIO(14)
VBatt
100n
1u
220ohm/100MHz