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ATR4258 데이터시트(PDF) 19 Page - ATMEL Corporation

부품명 ATR4258
상세설명  AM/FM RECEIVER IC
PDF  38 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATR4258 데이터시트(HTML) 19 Page - ATMEL Corporation

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ATR4258
4838A–AUDR–10/04
A Multipath Noise Canceller (MNC) is implemented to reduce disturbance of the
received signal in multipath reception conditions. If the difference between the momen-
tary and the averaged field strength falls below a threshold adjustable by bit 81 to 84
(see Table 32), the MPX signal may be muted and this situation (MPINT) can be signal-
ized at pin 21 (INT) according to Table 29 on page 17. Muting of the MPX signal during
multipath disturbances can be activated be setting bit 8.
The Multipath interrupt can also be switched on/off by bit 4.
Table 31. Multipath Noise Canceller
Multipath Noise Canceller
Bit 8
Active
0
Not active
1
Table 32. Sensitivity of the MNC
Sensitivity MNC (Threshold)
Bit 84
Bit 83
Bit 82
Bit 81
Off
000
0
Low
0
0
0
1
...
...
...
...
...
(-33 dB)
0
0
1
1
...
...
...
...
...
Normal (-14 dB)
0
1
1
1
...
...
...
...
...
High (-9 dB)
1
1
1
1
Note:
Valid in FM or WB mode (bit 92 = 1)
Table 33. Multipath Interrupt (MPINT)
MPINT (Pin 21)
Bit 4
Off
0
On (MPINT active)
1



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