參數(shù)資料
型號(hào)： T4258NFNG3
廠商： ATMEL CORP
元件分類(lèi)： 接收器
英文描述： AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO44
封裝： SSOP-44
文件頁(yè)數(shù)： 10/38頁(yè)
文件大?。?/td> 443K
代理商： T4258NFNG3
18
T4258N
4566B–AUDR–02/04
Adjacent Channel
Sensor
The adjacent channel sensor is active in FM mode only and measures the field strength
outside the reception band.
Figure 8. Adjacent Channel Sensor
MPINT and ADJAC Reset
Bit 6 allows a resets of the multipath sensor and the adjacent channel sensor by con-
necting pin 10 and pin 40 internally to ground and so the external capacitors can be
discharged very quickly.
Multipath Sensor
The multipath sensor is active in FM mode only and measures the disturbance due to
multipath reception. The multipath sensor detects drops in the field strength after the
integrated band filter by calculating the difference between an averaged maximum field
strength and the current field strength. The maximum depth of these drops is repre-
sented by the voltage of the peak detector at pin 40 (MULTIP). The level of this voltage
represents the degree of disturbance in the received signal.
Figure 9. Multipath Sensor
+
Pin 10 (ADJAC)
SMeter
30 A
IF
Pin 9 (Meter)
Table 30. Multipath and Adjacent Channel Reset
MPINT and Adjacent Channel (Pin 10 and Pin 40)
Bit 6
Normal mode
0
Connection to ground
1
4k
+
Pin 40
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