Fm Radio - Nokia NSB-9 Service Manual

NSB-9
System Module and User Interface

FM Radio

FM radio circuitry used in NSB-9 is a single-chip electronically tuned FM stereo radio
with fully integrated IF selectivity and demodulation. The radio is completely adjust-
ment-free and does only require a minimum of small and low cost external components.
It has signal dependent mono/stereo blend [Stereo Noise Cancelling (SNC)]. The radio can
tune the European, US and Japan FM bands.
FM-radio digital interface 3-wire bus contains write/read, clock and data lines. The bus
operates at maximum clock frequency of 1MHz. Channel tuning and other controls are
controlled through serial bus interface by the MCUSW. Reference clock, 32kHz, is gener-
ated by the UPP CTSI block (32kHz from sleep clock)
Page 28
Figure 3: FM radio digital interface.
UPP
FMClk
GenIO(3)
FMCtrlDa
GenIO(12)
FMCtrlClk
GenIO(11)
FMWrEn
GenIO(8)
Nokia Corporation
CCS Technical Documentation
TEA5767
XTAL2
VIO
SDA
SCL
W/R
Issue 1 04/03