LA1805 Ver la hoja de datos (PDF) - SANYO -> Panasonic

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LA1805

AM/FM-IF/MPX Tuner System for Radio-Casette Recorders, Music Centers

SANYO -> Panasonic 

LA1805

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.

LA1186N+LA1805 Muting Characteristics

LA1186N+LA1805 Attenuation – Detuning Frequency

Noise

Input – dBµ

Detuning frequency, f – kHz

Figure 9

Figure 10

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.

LED ON Sensitivity – R

Figure 11 Method to Change the LED ON

Sensitivity at the FM Mode

Unit (capacitance : F)

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.

Reference (R=Open)

Resistance, R – Ω

Figure 12

Figure 13

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.

No.2887-5/13

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