LA3401 Ver la hoja de datos (PDF) - SANYO -> Panasonic

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LA3401

VCO Non-Adjusting PLL FM MPX Stereo Demodulator with FM Accessories

SANYO -> Panasonic 

LA3401

4. Forced monaural mode

To provide the forced monaural mode, pin 16 is con-

nected to GND through a resistor of 10kΩ. In this case,

VCO oscillation does not stop.

FM/AM mode changeover

(1) How to change over

Changeover is performed by externally applying volt-

age to pin 10.

FM → AM changeover : Apply a voltage of 4.3V to

VCC–2 (not exceeding 10V) to pin.

AM → FM changeover : Apply a voltage of 0.5V or less

to pin 10.

Fig. 9 shows the relation between the voltage on pin 10

and the flow-in current.

(2) Muting in the changeover mode

Muting is turned ON for a certain period of time fixed

by external capacitor C6 in the FM → AM or AM →

FM changeover mode (muting in the changeover mode).

Fig. 10 shows the relation between the muting time in

the chageover mode and C6.

(3) VCO oscillation stop in the AM mode

By externally applying a specified voltage to pin 10 to select the AM mode, VCO oscillation stops automatically and

the monaural mode is forced to be entered.

Muting function

(1) How to turn ON/OFF muting

Muting is turned ON/OFF by externally applying voltage to pin 15.

Muting ON : Apply a voltage of 3.5V to VCC–3V to pin 15.

Muting OFF : Apply a voltage of 0.3V or less to pin 15.

Fig. 9 shows the relation between the voltage on pin 15 and the flow-in current.

(2) Hysteresis characteristic

Muting ON/OFF is allowed a hysteresis of approximately 6dB to prevent malfunction attributable to ripple in-

cluded in the IF meter output, muting drive output.

(3) Forced monaural in the muting mode

By externally applying a specified voltage to pin 15 to select the muting mode, the forced monaural mode is

automatically entered.

No.1868–8/15

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