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)： 6/38頁(yè)
文件大?。?/td> 443K
代理商： T4258NFNG3
14
T4258N
4566B–AUDR–02/04
The center frequency of the FM demodulator can be adjusted by means of bit 56 to 59.
At the center frequency, the DC voltage at the MPX output pin 11 is equal to the MPX
offset voltage that can be measured at pin 11 while MPX mute is active (bit 7 = 1). This
adjustment will affect the center frequency of all integrated filters as mentioned before.
Soft Mute
The soft mute functionality is implemented to reduce the output level of the FM demodu-
lator at low input signal levels to limit the noise at the MPX output in this case. If the
input level falls below an adjustable threshold continuously, the output of the FM demod-
ulator is continuously muted with decreasing input level until a maximum mute value is
reached. The threshold for the start of soft mute and the maximum mute can be
adjusted. The signal level for 3 dB mute can be set by means of bit 68 to 70 and the
maximum value for soft mute can be selected by bit 67. The steepness and the time
constant of the soft mute can be adjusted by the resistor and capacitor between pin 34
and pin 29.
The field strength signal available at pin 9 is used for soft mute. Therefore, the soft mute
threshold that referred to the input of the FM mixer depends on the gain from the FM
mixer input to the field strength sensor and on the setting of field strength offset (bit 15 to
21).
Table 19. Demodulator Gain in Weather Band Mode
Demodulator Gain in Weather Band Mode Relative to FM Mode
Bit 72
Bit 71
14 dB
0
17 dB
0
1
21 dB
1
0
23 dB
1
Table 20. Demodulator Fine Adjustment
Demodulator Fine Adjustment
Bit 53
Fine tuning ON
0
Fine tuning OFF
1
Table 21. Soft Mute Threshold
Relative Soft Mute Threshold
Bit 70
Bit 69
Bit 68
Soft mute OFF
0
-18 dB
0
1
-15 dB
0
1
0
-12 dB
0
1
-9 dB
1
0
-6 dB
1
0
1
-3 dB
1
0
0 dB
1
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