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ATR4258
4.15
Integrated FM Band Filter
For FM reception a band filter with variable bandwidth is integrated in front of the demodulator to
provide channel selectivity on the 2 nd IF. The bandwidth of this filter can be adjusted by bit 0 to 3
(see Table 4-18 ) to be suitable for the present receiving condition. In WB mode, the bandwidth
of the integrated filter is shifted to lower bandwidth values, while the necessary channel selectiv-
ity is achieved by an external ceramic filter.
The center frequency of the integrated FM band filter can be adjusted by means of bit 14 to 17.
The field strength after the integrated FM band filter that is available at pin 20 (bit 55 = 1) can be
used for this purpose.
Table 4-18.
Bandwidth of the Integrated Band Filter
IF Bandwidth FM (kHz) IF Bandwidth WB (kHz)
Bit 3
Bit 2
Bit 1
Bit 0
220
...
200
...
165
...
130
...
90
80
70
60
195
...
160
...
120
...
80
...
45
Not usable
Not usable
Not usable
0
...
0
...
0
...
1
...
1
1
1
1
0
...
0
...
1
...
0
...
1
1
1
1
0
...
1
...
1
...
0
...
0
0
1
1
0
...
1
...
0
...
1
...
0
1
0
1
4.16
FM Demodulator
For weather band reception, the gain of the FM demodulator is increased and can be adjusted
by means of bit 71 and bit 72 in order to increase the output voltage to compensate the low fre-
quency deviation in weather band.
An integrated demodulator fine adjustment allows automatic fine tuning of the demodulator cen-
ter frequency to the average frequency of the received signal. This feature is implemented for
use in weather band mode and can be activated by setting bit 53 to 0.
Figure 4-3.
FM Demodulator Automatic Fine Tuning
FM-Demod
MPX (Pin 11)
Center
fre qu ency
AM
AGC
B92
IFAGCH (Pin 3 5)
-
+
V 3 P
Bit 5 3
(Pin 27)
A u tom a tic
fre qu ency
a dj us tment
13
4838B–AUDR–05/05
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