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U4255BM-MFN Datasheet(PDF) 9 Page - ATMEL Corporation

Part # U4255BM-MFN
Description  AM / FM RECEIVER IC
Download  32 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

U4255BM-MFN Datasheet(HTML) 9 Page - ATMEL Corporation

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U4255BM-M
4519C–AUDR–07/02
Table 14. FM Band Filter Center Frequency Correction
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 2nd IF. The bandwidth of this filter can
be adjusted by Bit 0 to 3 (see Table 15) to be suitable for the present receiving condi-
tion. In WB mode, the bandwidth of the integrated filter is shifted to lower bandwidth
values, while the necessary channel selectivity 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 (Bit 4 set to 1). The field strength after the integrated FM band filter that is
available at Pin 20 (Bit55 = 1) can be used for this purpose.
Table 15. Bandwidth of the Integrated FM Band Filter.
IF Correction
Bit 17
Bit 16
Bit 15
Bit 14
- 0 kHz
000
0
- 6.25 kHz
000
1
- 12.50 kHz
0
0
1
0
- 18.75 kHz
0
0
1
1
- 25.00 kHz
0
1
0
0
- 31.25 kHz
0
1
0
1
- 37.50 kHz
0
1
1
0
- 43.75 kHz
0
1
1
1
+ 0 kHz (default)
1
0
0
0
+ 6.25 kHz
100
1
+ 12.50 kHz
101
0
+ 18.75 kHz
101
1
+ 25.00 kHz
110
0
+ 31.25 kHz
110
1
+ 37.50 kHz
111
0
+ 43.75 kHz
111
1
IF Bandwidth
Bit 3
Bit 2
Bit 1
Bit 0
200 kHz
0
0
0
0
190 kHz
0
0
0
1
180 kHz
0
0
1
0
170 kHz
0
0
1
1
160 kHz
0
1
0
0
150 kHz
0
1
0
1
140 kHz
0
1
1
0
130 kHz
0
1
1
1
120 kHz
1
0
0
0
110 kHz
1
0
0
1
100 kHz
1
0
1
0
90 kHz
1
0
1
1
80 kHz
1
1
0
0
70 kHz
1
1
0
1
60 kHz
1
1
1
0
50 kHz
1
1
1
1


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