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LA1265 Fiches technique(PDF) 4 Page - Sanyo Semicon Device |
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LA1265 Fiches technique(HTML) 4 Page - Sanyo Semicon Device |
4 / 15 page LA1265 No.1820-4/15 3. Local OSC buffer output • When local OSC buffer output wave form is saw-toothed at the SW mode, connect a resistance of 1.2k Ω or thereabouts across pin 22 and GND. 4. AM input pin • It is desirable that the AM input pin (pin 19) be L-coupled to pin 18. • Inputting to pin 19 can be done by DC-cutting with a capacitor. However, an unbalance in the RF amplifier (differential amplifier) causes gain drop and whistle worsening. 5. Capacitance across pin 9 and GND. A large capacitance across pin 9 and GND may cause a misstop at an adjacent channel when the channel select speed is made faster at the automatic channel select mode. In this case, decrease the capacitance across pin 9 and GND. However, if too decreased, the LED will flutter at low modulation frequencies at the time of detuning. Therefore, it is recommended to fix the capacitance across pin 9 and GND to be 3.3µF to 10µF. The relation between modulation frequency and demodulation output voltage on pin 9 with the capacitance across pin 9 and GND as a parameter is shown right. • LED lighting sensitivity setting for FM. – For the LED lighting sensitivity setting for FM, the IC input may be 45dBµ to 60dBµ. With the variations in the front end considered, it is ideal that the IC input in a standard receiving set be 51dBµ to 54dBµ. The lower value of VR2 for the LED lighting sensitivity setting is as illustrated right. Since the variations in the front end cause the IC input setting sensitivity to vary, it is recommended to use a value of VR2 at an input voltage lower than a standard setting by 6dB or greater. For example, if IC input 53dBµ is taken as a standard, use VR2 ≤100kΩ at IC input 47dBµ. 2. AM/FM changeover • Two selections are available for changeover as shown below : (A) pin 17-used method and (B) pin 18-used method. • For (A), the voltage on pin 17 relative to VCC (pin 7) must be within the range of –0.8V to +0.1V. If not within this range, distortion and selectivity will get worse. • For (A), a resistance of 68k Ω at the IFT cold terminal, which is used to prevent the changeover circuit from malfunctioning, must be connected. (A) pin 17-use method for AM/FM changeover (B) Pin 18-used method for AM/FM changeover IC input – dBµ Semifixed Variable Resistor for FM LED lighting sensitivity setting for FM Ideal setting range Modulation frequency – Hz V9 – Modulation Frequency |
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Description similaire - LA1265 |
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