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參數(shù)資料
| 型號(hào)： | LA7578 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 252K |
| 代理商： | LA7578 |
Fig. 21
Fig. 22
Fig. 23
Pins 15 and 16 (VCO tank)
These pins are for the VCO tank circuit.
The tank circuit capacitor is designed to be 20 to 27 pF. 24 pF
is recommended. The VCO tank capacitor can be either built
into the coil or a component in chip form. This circuit protects
VCO from external influences.
Pin 17 (composite video output)
This is an output pin for the video signal including a 4.5 MHz
component.
Although this is an emitter output, a resistor should be
connected between pin 17 and GND in order to attain
satisfactory drive capability.
V
CC
= 12 V
V
CC
= 9 V
R
^
1.2 k
R
^
1 k
Pin 18 (APC filter)
This is the APC filter pin.
APC time constant switching is performed within the IC. When
locked, VCO is controlled by route A, and the APC loop gain
decreases. When unlocked or when there is a weak electric
field, VC is controlled by route B and the APC loop gain
increases, broadening the pull-in range. The recommendations
for this APC filter are: R = 47 to 150
;
C = 0.47 μF.
LA7578N
No.4037-14/18
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