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參數資料
| 型號： | LA7565BM |
| 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： | 4/17頁 |
| 文件大小： | 292K |
| 代理商： | LA7565BM |
No. 5636-12/17
LA7565B, 7565BM
Pin No.
Pin
Pin function
Equivalent circuit
15
First SIF input
A DC cut capacitor must be used in the input to this circuit.
When using a SAW filter:
The first SIF sensitivity can be increased by inserting an
inductor between the SAW filter and the IC input to
counteract the SAW filter output capacitance and the IC
input capacitance.
When used with an intercarrier sound system:
This pin may be left open.
Continued from preceding page.
16
First SIF AGC filter
This IC adopts an average-value AGC technique. The first
SIF conversion gain is about 30 dB, and the AGC range is
50 dB or greater. A capacitor of 0.01 F is normally used as
the filter connected to this pin.
When used with an intercarrier sound system:
This pin (pin 16) should be shorted to ground. The IC
internal switch will operate and the intercarrier output will be
connected to the SIF converter input.
17
IF AGC filter
The internal AGC peak detector output signal is converted
to the AGC voltage at pin 17. Additionally, a second AGC
filter (a lag-lead filter) used to create dual time constants
internally to the IC is built in.
A 0.022-F external capacitor is used. The value of this
capacitor must be adjusted based on an analysis of the sag,
AGC speed, and other aspects.
Continued on next page.
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