LA3450 データシートの表示（PDF） - SANYO -> Panasonic
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LA3450 Datasheet PDF : 15 Pages
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LA3450
3. VCO stop method
VCO OSC can be stopped and the forced monaural mode is entered by applying a voltage of 2.5V or greater to pin 10.
The maximum voltage to be applied to pin 10 is 16V regardless of the voltage on pin 28 (VCC pin). The relation
between applied voltage and flow-in current is shown in Fig. 1.
Fig. 1. Voltage Applied to pins 10, 26 – Flow-in Current
4. Forced monaural mode
Connecting pin 16 to GND through a resistor of 10kΩ causes the forced monaural mode to be entered.
5. AM/FM mode select method
The AM/FM mode can be selected by applying a voltage to pin 26. When the voltage on pin 26 is 0.5V or less, the FM
mode is entered, and when 2.5V or greater, the AM mode is enterd. In AM mode the VCO stops and the forced
monaural mode is entered. The relation between voltage on pin 26 and flow-in current is as shown in Fig. 1.
6. Separation adjust method
The separation is adjusted by varying the gain of the main signal with VR2, VR3 as shown in the Sample Application
Circuit. Sample Application Circuit (1) or (2) is used according to the attenuation of the input sub signal. When the
attenuation ratio of the sub signal to the main signal is 0.92 or greater to 1, use Sample Application Circuit (1), and
when 0.92 or less to 1, use Sample Application Circuit (2). Capacitors C20 and C21, which are used to improve the
separation characteristic at high frequencies, must be set to the optimum values according to your model set.
7. Cal-tone
The OSC frequency can be set with R2, C9 in the Sample Application Circuit (refer to Fig. 2). The OSC level can be
attenuated on connecting resistor Rx across pin 15 and pin 16 (refer to Fig. 3). When tthe S2 is turned on, the triangular
wave generated on pin 15 is amplified by the post amplifier and output. The level at pins 18, 20 is approximately 4V
(p-p) when the typical constants are used in the Sample Application Circuit and the output level becomes approxi-
mately 4X20/ (Rx+20) V (p-p) by connecting Rx.
Fig. 3. OSC Level Variable
No.2393–9/15
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