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參數(shù)資料
| 型號(hào)： | 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)： | 3/38頁 |
| 文件大小： | 443K |
| 代理商： | T4258NFN |
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11
T4258N
4566B–AUDR–02/04
2nd IF Output
The 2nd IF after the gain-controlled 2nd IF amplifier is available at pin 20 (bit 55 = 0). In
AM mode, this signal may be used for an external AM stereo decoder. Alternatively, a
signal corresponding to the logarithmic field strength after the integrated FM band filter,
which is used for multipath detection, can be switched to pin 20 by setting bit 55 = 1.
Automatic IF Center
Frequency Adjustment
Integrated active filters are used in the FM band filter, FM demodulator and adjacent
channel sensor. The center frequency of these filters is automatically adjusted to the
second IF frequency of 450 kHz. The frequency of 10.25 MHz at pin 22 is used as a
reference for this alignment.
Figure 4. Automatic IF Center Frequency Adjustment
For fine tuning, the center frequency of all these integrated active filters (band filter and
demodulator) can be shifted in steps of 6.25 kHz by means of bit 56 to bit 59. Addition-
ally, the center frequency of the band filter can be adjusted separately by means of
bit 14 to bit 17.
Table 15. Pin 20 Output Setting
Pin 20
Bit 55
2
nd IF output
0
Multipath field strength
1
Automatic
frequency
adjustment
FM-Demod
FM-
band filter
Bit 56...59
10.25 MHz
Bit 14...17
Center
frequency
Center
frequency
Pin 37
Pin 22
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