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參數(shù)資料
| 型號： | T4258NFN |
| 廠商： | ATMEL CORP |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO44 |
| 封裝： | SSOP-44 |
| 文件頁數(shù)： | 5/38頁 |
| 文件大?。?/td> | 443K |
| 代理商： | T4258NFN |
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13
T4258N
4566B–AUDR–02/04
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 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 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. The field strength after the integrated FM band filter that is available at pin 20
(bit 55 = 1) can be used for this purpose.
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 com-
pensate the low frequency deviation in weather band.
An integrated demodulator fine adjustment allows automatic fine tuning of the demodu-
lator center 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 5. FM Demodulator Automatic Fine Tuning
Table 18. Bandwidth of the Integrated Band Filter
IF Bandwidth FM
IF Bandwidth WB
Bit 3
Bit 2
Bit 1
Bit 0
220
195
0
...
200
160
0
1
...
165
120
0
1
0
...
130
80
100
1
...
80
35
1
0
1
70
–
111
0
60
–
111
1
FM Demod
+
AM
AGC
B92
Center freq.
Bit 53
Automatic
frequency
adjustment
MPX (Pin 11)
IFAGCH (Pin 35)
V3P
(Pin 27)
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