參數(shù)資料
型號(hào)： T4258NFNG3
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(yè)數(shù)： 9/38頁(yè)
文件大?。?/td> 443K
代理商： T4258NFNG3
17
T4258N
4566B–AUDR–02/04
Note:
MPINT = Multipath interrupt, Stop and MPINT signal are active low
Pin 35 (IFAGCH) is carried along with pin 36 (IFAGCL) to avoid crackles during a
change of the search stop mode to the AM reception mode.
Deviation Sensor
The deviation sensor is active in AM and FM/WB mode and measures the modulation of
the signal. It is implemented as a peak detector of the low-pass-filtered MPX signal (see
Figure 7). The output voltage at pin 31 is proportional to the frequency deviation in
FM/WB or the modulation depth in AM respectively.
Figure 7. Deviation Sensor
Table 28. Search Stop Window
Search Stop Window
Bit 87
Bit 86
Bit 85
±0.5 kHz
0
±1.1 kHz
0
1
±2.3 kHz
0
1
0
±4.8 kHz
0
1
±10 kHz
1
0
±20 kHz
1
0
1
±40 kHz
1
0
±80 kHz
1
Table 29. Signals Available at Digital Output Pin 21
Bit 88
Bit 92
INT (Pin 21)
00 (AM)
1
0
1 (FM/WB)
NOT MPINT
10 (AM)
NOT STOP
1
1 (FM/WB)
NOT (STOP AND NOT MPINT)
+
4k
MPX
25k
Pin 31
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