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參數資料

Usage Notes

1. AM/FM switching: Pin 31 (IF VCC)

This pin is shared with the IF VCC. When the FM IF is operated, the IC automatically switches to FM mode. (Note

that the switching reference voltage is 3.3 V.)

Figure 1

2. FM SD and SD adjustment

The FM SD and the IF counter buffer operate with the elements shown below.

The following conditions are required for FM SD operation.

V30 > VA:

The S-meter voltage must be higher than the regulator voltage.

V23 < 0.7 V (VBE): The Hall detector and band mute must not operate.

V29 = H:

A high level must be applied to pin 29 through a 100 kΩ resistance.

The following condition is required for IF buffer operation.

V19 = H:

A high level must be applied to pin 19 through a 51 kΩ resistance.

No. 4619-18/32

LA1867NM

Pin V31

Mode

8 V

open

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