M52347FP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M52347FP

SYNC SIGNAL PROCESSOR

MITSUBISHI ELECTRIC  

APPLICATION METHOD

1. Input block

1) GREEN (SYNC ON VIDEO) IN (Pin 3 )

Input with sync negative polarity.

Comparison of pin 4 input signal and the reference voltage of

the inside of the IC performs the synchronous separation. When

the input at pin 4 is less than or equal to the reference voltage

(2.8V) and the flowing current is more than or equal to the input

sensitivity current (200 µ A or more), the signal is separated.

When only a synchronous signal is input into pin 4 , the

operatable amplitude and the duty are as shown in Figure 1.

If the IC does not operate normally with the video signal input,

change the value of external resistance R to make the current

optimum.

But, when capacity value is too big, output response

becomes bad.

2) COMP/H IN, VIN (pins 6 and 8 )

The composite sync input is connected to pin 6 . H and V of the

separate sync input are connected to pins 6 and 8 ,

respectively. For each of pins 6 and 8 , the bias is 2.5V and the

impedance is 10 kΩ. The internal double threshold converter is

used for shaping waveform and for detecting polarity.

Average DC voltage of input signal is 2.5V. Each threshold

voltage is set at a voltage ±0.3V away from this voltage.

If the duty ratio at pin 6 is small as shown in Figure 2, the

optimum value is approx. 0.3 VP-P. If the duty ratio is large, the

optimum value is approx. 0.6 VP-P. Figure 3 shows the allowable

input amplitude and the reference value of duty test.

Only 5V TTL input, decrease the amplitude by resistor

splitting.

In addition, Figure 4 shows an example for improving the

capability of the allowable duty when the input amplitude is 0.7

VP-P or more.

To use the IC out of the standard value, remove the filter from

pins 7 and 9 , observe the waveform and check for a match

with the waveform shown in Figure 5.

Small POSI Duty

Lsrge NEG Duty

Fig. 2

2.8V

2.5V

2.2V

MITSUBISHI ICs (Monitor)

M52347SP/FP

SYNC SIGNAL PROCESSOR

18kΩ

Input signal

100Ω

3kΩ

pin 6

or pin 8

This additional circuit (limiter) limits

the amplitude to 0.6 VP-P.

: 5V

Fig. 4

30

25

R=56kΩ

20

15

10

5

f=100kHz

R=75kΩ

3.3µ

4

R

0

0

0.2

0.4

0.6

0.8

1.0

Input Amplitude (VP-P)

Fig. 1

50

40

30

20

10

0

0

0.5

1

1.5

2

2.5

Input Amplitude (VP-P)

Fig. 3

4.5V

POSI input

2.5V

Fig. 5

NEG input

2.5V

0.5V

10

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