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参数资料
| 型号： | T4258NFN |
| 厂商： | ATMEL CORP |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO44 |
| 封装： | SSOP-44 |
| 文件页数： | 7/38页 |
| 文件大小： | 443K |
| 代理商： | T4258NFN |
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15
T4258N
4566B–AUDR–02/04
Figure 6. Soft Mute
MPX Output
The output of the AM demodulator (AM mode) or the output of the FM demodulator
(FM/WB mode) are available at the MPX output (pin 11).
The MPX output signal can be muted by setting bit 7 to 1.
The bandwidth of the low-pass filter at the MPX output can be set by means of bit 79 to
90 kHz or 180 kHz.
Receiving Condition
Analyzer
The T4258N implements several sensors that provide information about the receiving
condition of the selected station.
Table 22. Maximum Soft Mute
Maximum Value of Soft Mute
Bit 67
30 dB
0
26 dB
1
Pin 34
Pin 29
+
V3
Bit 67
FS (Pin9)
Bit 68..70
Gain FM-Demodulator
Table 23. MPX Output Mute
MPX Output
Bit 7
MPX out, pin 11 normal operation
0
Mute ON
1
Table 24. MPX Output Bandwidth
Bandwidth MPX Low-pass Filter
Bit 79
90 kHz
0
180 kHz
1
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