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參數(shù)資料
| 型號(hào)： | 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)： | 4/16頁 |
| 文件大?。?/td> | 354K |
| 代理商： | LA7577N |
LA7577N
No. 4037—12/16
VCO Tank (Pins 15 and 16)
The VCO tank circuit is shown in Figure 21. The tank cir-
cuit capacitors connected between pins 15 and 16 should
be in the range 20 to 27pF (24pF is recommended). The
VCO tank susceptibility to external effects can be reduced
by using either chip capacitors or capacitors integrated
with the tank coil.
Figure 20. AFT output
Figure 21. VCO tank
Composite Video Output (Pin 17)
The 4.5MHz composite video output circuit is shown in
Figure 22. A resistor should be connected between this
emitter-follower output and ground to ensure adequate
output drive capability. The resistor should be
≥1.2kΩ
(VCC = 12V), or ≥1kΩ (VCC = 9V).
APC Filter (Pin 18)
Time-constant switching is incorporated into the VCO for
automatic phase control (APC). When the PLL is locked,
the VCO is controlled by loop A, shown in Figure 23.
When the PLL is unlocked or the signal is weak, the VCO
is controlled by loop B which has higher gain. The
increased APC loop gain also increases the pull-in range.
The recommended range for the external APC lter resis-
tor is 47 to 150
Ω, and for the capacitor, 0.47μF.
Figure 22. Composite video output
Figure 23. APC lter
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