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参数资料
| 型号： | LA1267 |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| 封装： | DIP-24 |
| 文件页数： | 8/14页 |
| 文件大小： | 536K |
| 代理商： | LA1267 |
LA1267
No.2012-3/14
How to use the LA1267
1. LED lighting, muting drive output, stop signal (SD).
For LED lighting, muting drive output, stop signal, the output at
pin 8 is used.
The 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 CF (BFU450CN) at
pin 11. If a capacitor is connected in place of the CF, 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
120kHz.
Sensitivity adjustment of LED, muting, stop signal.
– For FM, the semifixed variable resistor across pin 15 and GND is used.
– For AM, the semifixed variable resistor across pins 15 and 16 is used. Be sure to start adjustment for FM, and then
make adjustment for AM. For the stop signal sensitivity and FM stop signal bandwidth, the variations should be
considered and it is recommended to use the semifixed variable resistor for adjustment.
LED lighting sensitivity setting for AM.
For the LED lighting sensitivity setting for AM, it is desirable that the IC input be 30dBμ (antenna input :
approximately 50dB/m). In this case, the value of VR1 is 30k
Ω.
Equivalent Circuit Block Diagram
Resistance across pins 9 and 22 – k
Ω
LED Lighting Bandwidth – Resistance across pins 9 and 22
LED
lighting
bandwidth
–
kHz
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