Nokia 8390 Manuales De Servicio
NSB-8
System Module & UI
PAMS Technical Documentation
Page 28
ãNokia Corporation
Issue 1 01/02
DC characteristics
Regulators
Transceiver has a multifunction power management IC on baseband section, which con-
tains among other functions; 7 pcs of 2.78 V regulators and 4.8V up-switcher for charge
pump.
tains among other functions; 7 pcs of 2.78 V regulators and 4.8V up-switcher for charge
pump.
All regulators can be controlled individually with 2.78 V logic directly or through control
register. In GSM direct controls are used to get fast switching, because regulators are
used to enable RF-functions.
register. In GSM direct controls are used to get fast switching, because regulators are
used to enable RF-functions.
Use of the regulators can be seen in the Power Distribution Diagram. VrefRF01and
VrefRF02 are used as the reference voltages for HAGAR RF-IC, VrefRF01 (1.35V) for bias
reference and VrfeRF02 (1.35V) for RX ADC's reference.
VrefRF02 are used as the reference voltages for HAGAR RF-IC, VrefRF01 (1.35V) for bias
reference and VrfeRF02 (1.35V) for RX ADC's reference.
Regulators (except VR2 and VR7) are connected to HAGAR. Different modes are switched
on by the aid of serial bus.
on by the aid of serial bus.
List of the needed supply voltages:
Volt. source
Load
VR1A
PLL charge pump (4.8 V)
VR2
TX modulator
VR3
VCTCXO + buffer
VR4
HAGAR IC (LNAs+mixer+DTOS)
VR5
HAGAR IC (div+LO-buff+prescaler),
VR6
HAGAR (Vdd_bb)
VR7
VCO
VrefRF01
ref. voltage for HAGAR
VrefRF02
ref. voltage for HAGAR
Vbatt
PA