HA11560FP データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA11560FP

VCR/VDP RF Modulator

Hitachi -> Renesas Electronics 

HA11560FP/T

Audio Modulator

Pins 4 and 5 make up the reference oscillator for

the 4.5 MHz audio modulator. Pin 4 is the

oscillator’s reference bias source. A 15 pF

capacitor must be used for C3 at pin 4 to cut the ac

signal. The oscillation frequency is determined by

an external tank circuit.

An external cuppling capacitor is not required

when pin 6, which is the audio input pin, is almost

equal to ground potential and the audio input

signal dc level is ground potential. The ground

potential of the input pin results in a circuit

configuration that reduces pin 6 voltage

fluctuations and suppresses popping noise.

VCC

200

2k

Audio oscillator

Audio amplifier

100

4

5

C3

T1

15 p

100 k

6

R5

330

Audio input

Figure 5 Audio Modulator Interface Circuit

7

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