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參數資料
| 型號： | LA1267 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | FM/AM Tuner of Electronic Tuning Type(電子調諧型FM/AM調諧器) |
| 中文描述： | 調頻/調幅調諧器（電子調諧型調頻/調幅調諧器電子調諧型） |
| 文件頁數： | 3/14頁 |
| 文件大?。?/td> | 556K |
| 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
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
.
Equivalent Circuit Block Diagram
Resistance across pins 9 and 22 – k
LED Lighting Bandwidth – Resistance across pins 9 and 22
L
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