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參數資料
| 型號： | LA1266 |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁數： | 4/6頁 |
| 文件大小： | 487K |
| 代理商： | LA1266 |
LA1266
No.2291-4/11
How to use LA1266
1. LED driver, muting drive output, stop signal (SD).
For LED drive, muting drive output, stop signal, the output at pin 8 is used.
Voltage on pin 8, when tuned, turns from "H" to "L" . (Active-low)
Signal bandwidth at pin 8
For AM, the bandwidth depends on the C.F (BFU450CN) at pin 14. If a capacitor is connected in place of the C.F,
the bandwidth will get wider.
For FM, the bandwidth depends on the resistance across pins 9 and 22. If the resistance is increased, the
bandwidth will get narrower. R = 15k
Ω makes the bandwidth approximately 110kHz.
Sensitivity adjustment of LED, muting, stop signal
For FM, the semifixed variable resistor across pin 16 and GND is used.
For AM, the semifixed variable resistor across pin 17 and GND is used.
The relation (for AM, FM) between signal meter voltage and input voltage with the resistance of the semifixed
variable resistor as a parameter is shown below.
120
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
JK126604
0
204060
80
100
17
R
120
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
JK126603
0
20
40
60
80
100
16
R
f = 1MHz
10
μ
F
f = 10.7MHz
0.047
μ
F
R = 50kΩ
30k
Ω
25k
Ω
20k
Ω
15kΩ
10kΩ
7k
Ω
R = 15k
Ω
10k
Ω
5k
Ω
3.3k
Ω
FM S Meter Voltage
S
meter
v
oltage
-
V
S
meter
v
oltage
-
V
AM S Meter Voltage
IF input voltage -- dB
/μ
Antenna input voltage -- dB
/m
2. AM/FM changeover
AM/FM changeover is made using pin 20 as shown right.
However, the voltage on pin 20 relative to VCC (pin 7) must be within the
range of
+0.1V to 0.8V. If not within this range, distortion and selectivity
will get worse. A resistance of 68k
Ω at the IFT cold terminal, which is
used to prevent the changeover circuit from malfunctioning, must be
connected.
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相關代理商/技術參數 |
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| LA1270 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA1270M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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