LA1267 Datasheet, PDF (3/14 Pages) Sanyo Semicon Device – FM/AM Tuner of Electronic Tuning Type

Equivalent Circuit Block Diagram
LA1267
How to use the LA1267
1. LED lighting, muting drive output, stop signal (SD).
LED Lighting Bandwidth – Resistance across pins 9 and 22
• 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=15kΩ makes the bandwidth approximately
120kHz.
Resistance across pins 9 and 22 – kΩ
• 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 30kΩ.
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