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參數(shù)資料
| 型號： | LA7577N |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 354K |
| 代理商： | LA7577N |
LA7577N
No. 4037—14/16
1st SIF Output (Pin 22)
The 1st SIF output is an emitter follower with internal
100
Ω series resistor as shown in Figure 27. An additional
series resistor should be used for impedance matching to
the ceramic band-pass lter.
1st SIF AGC Filter (Pin 23)
The 1st SIF amplier has an AGC range of approximately
30dB. The capacitor on pin 23 is normally 0.01
μF, but
may, depending on the situation, be as large as 4.7
μF
(4.7
μF is recommended when using the lter for NICAM
signal processing).
SIF Input (Pin 24)
The input impedance of the amplier, shown in Figure 29,
is approximately 1k
Ω. Any interference on pin 24, a video
signal for example, can cause audio buzz or heterodyning.
Good circuit board layout is essential. Examples of both
good and poor layout are shown in Figure 30.
Figure 27. 1st SIF output
Figure 28. 1st SIF AGC lter
Figure 29. SIF stage input circuit
Figure 30. PCB layout examples
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