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參數資料
| 型號： | LA7565KM |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | MFP-24 |
| 文件頁數： | 2/18頁 |
| 文件大?。?/td> | 207K |
| 代理商： | LA7565KM |
Pin No.
Pin
Pin function
Equivalent circuit
3
4
A12055
A12054
200
500 kHz
400
68
400
No. 6100-10/18
LA7565E, 7565KM
Pin Functions
1
SIF INPUT
The input impedance is about 1 k
. If interference signals
enter via this pin, those signals may cause buzz and buzz
beat noise. (Here, signals such as video signals or
chrominance signals are the main audio interference
signals. The VIF carrier signal may also appear as
interference.) The application printed circuit board pattern
layout should be designed carefully to prevent interference
from entering at this pin.
2
FM power supply filter
The FM S/N ratio can be improved by inserting a filter in the
FM detector bias line.
The capacitor C1 should have a value of 0.47 F or greater,
and 1 F is recommended.
A 2-k
resistor must be inserted between pin 2 and ground
if the FM detector is not used. This stops the FM detector
VCO.
3
4
SIF converter
Pin 3 is the SIF converter output.
This signal is passed through a 6-MHz band-pass filter and
input to the SIF circuit. A 200-
resistor is inserted in series
with the emitter-follower output.
Pin 4 is the SIF converter 500-kHz oscillator pin.
Since the oscillator circuit includes an ALC circuit, the
oscillator level is controlled at a fixed, relatively low level. An
external 10-k
resistor must be inserted between pin 3 and
ground if this circuit is not used. Attaching this external
resistor stops the 500-kHz oscillator and the converter can
be used as an amplifier.
Continued on next page.
1
1 k
1 k
A12052
2
A12053
C1
TO VCO BIAS
4.2V
24
k
4
k
14
k
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