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LA1805 Datasheet(PDF) 5 Page - Sanyo Semicon Device |
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LA1805 Datasheet(HTML) 5 Page - Sanyo Semicon Device |
5 / 13 page LA1805 No.2887-5/13 5. FM muting pin The external resistor connected to pin 12 can be used to vary the muting level (Figure 9). The abnormal sound at the time of side peak reception at the FM mode can be reduced by weak signal muting. Input – dBµ LA1186N+LA1805 Muting Characteristics Detuning frequency, f – kHz LA1186N+LA1805 Attenuation – Detuning Frequency Noise 6. The following method can be used to change the LED ON sensitivity at the FM mode (Figure 11). The data on the LED ON sensitivity setting resistance and LED ON sensitivity is shown in Figure 12. 7. AM-FM selection The FM mode is entered with pin 11 open as shown in Figure 13. When pin 11 and pin 21 are made to be at the same potential in terms of DC, the AM mode is entered. It should be noted that the dynamic range is narrowed whether the potential at pin 11 is lower or higher than that at pin 21. 8. If a noise appears in the detection output when the tuning LED goes ON at the AM mode, connect a capacitor across pin 8 and GND to eliminate the noise. Resistance, R – Ω LED ON Sensitivity – R Reference (R=Open) Figure 11 Method to Change the LED ON Sensitivity at the FM Mode Unit (capacitance : F) Figure 13 Figure 9 Figure 10 Figure 12 |
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