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參數(shù)資料
| 型號： | LA75520KVA |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | 0.225 INCH, SSOP-24 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 134K |
| 代理商： | LA75520KVA |
LA75520KVA
No.A0654-10/12
Continued from preceding page.
Pin No.
Pin name
Function
Equivalent Circuit
12
AFT OUTPUT
AFT output pin. The AFT center voltage is
generated by an external bleeder resistor. The AFT
gain is increased by increasing the resistance of this
external bleeder resistor.
For the resistor we recommend a resistance equal
to or greater than 22k
Ω.
For the filter C1 we recommend a capacitance of
0.1
μF.
12
R
500
Ω
500
Ω
R
C1
13
1st SIF INPUT
First SIF input pin. A DC cut capacitor must be used
in the input circuit.
(a) If a SAW filter is used :
The first SIF sensitivity can be increased by
inserting an inductor between the SAW filter and the
IC to neutralize the SAW filter output capacitance
and the IC input capacitance.
(b) When used in an intercarrier system :
Connect this pin to ground.
13
2k
Ω
14
RF AGC OUTPUT
RF AGC output pin. This output controls the tuner
RF AGC.
This is the open collector output and a protective
200
Ω resistor is inserted. Determine the external
bleeder resistor value in accordance with the
specifications of the tuner.
14
200
Ω
VCC
15
AFT MUTE LEVEL
A switch pin for selecting the mute potential when
muting is applied to the AFT due to PLL unlock, etc.
At the same time, it is used to control the trap point
shift of the audio trap (in the B/G mode). When the
frequency characteristics of the video band are to
be made as flat as possible with the split input, the
trap can be shifted to the high range although the
attenuation of the sound carrier will drop. Therefore,
when used in combination with the SAW filter, verify
that the level is high enough before use.
Voltage
ATF MUTE
Voltage
TRAP SHIFT
VCC to 4V
VCC/2
0
4V to 2.5V
VCC/2
+250kHz
2.5V to 1V
VCC
0
1V to GND
VCC
+250kHz
* When VCC = 5 V
15
66k
Ω
34k
Ω
Continued on next page.
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| LA75520KVA | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA75520K | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP24 |
| LA75520K | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP24 |
| LA75520VA | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
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