M52347FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M52347FP

SYNC SIGNAL PROCESSOR

MITSUBISHI ELECTRIC  

MITSUBISHI ICs (Monitor)

M52347SP/FP

SYNC SIGNAL PROCESSOR

3) Polarity detection and non-input detection (pins 7 and 8 )

External capacitance is required as a filter pin to detect polarity

and non-input. As the value is larger, the ripple is smaller and

less malfunction occurs. However, the response speed for

detection is lower. A sufficient external capacitance is 0.05 µF

with input of 15 kHz and 10 uF with input of 60 kHz. However,

check the frequency of the input signal in use and the filter pin

waveform with the duty ratio conditions, and then check that the

value is 3.1V or more (2.8V in capability) with positive polarity

input and 1.9V or less (2.2V in capability) with negative polarity

input.

4) V S/S IN (pin 11 )

Input a signal of having externally integrated composite sync for

V sync separation.

Composite sync input into pin 6 is output to pin 12 . Output at 12

is externally integrated and is input into pin 11 for V sync

separation. With the waveform at pin 11 , check that the H

element has been fully dropped.

The threshold levels of sync separation, given hysteresis, are

3.5V and 1.8V.

Input waveform at

pin 6

when COMP/H only is input or when both COMP/H and GREEN

are input.

8

6

4

R=10kΩ

2

R=4.3kΩ

0

10

100

1000

Clamp Timing Capacitance at Pin 20 (pF)

3. Sampling Pulse from VD Portion

V TIME GATE SW (Pin 10 )

Whether to output the pulse of VD portion from pins 14 and 15

can be selected. When pin 10 is "H" or OPEN, pulse of the VD

portion is output. When pin 10 is "L", the pulse of the VD portion

is not output.

Waveform at

pin 11

Output waveform at

pin 13

VTH=3.5V

VTH=1.8V

Output at pin 14 when the pin 10 is "H" or OPEN

2. Clamp Pulse

1) Clamp pulse width

CLAMP TIMING (Pin 20 )

The clamp pulse width is determined by the external resistance

and the capacitance. As the resistance value and capacitance

value are larger, the clamp pulse width is wider.

The time constant is determined by the current flowing out of pin

20 and the capacitance value of the timing pin. The flow current

at pin 20 is determined by the pin voltage and external resistance

value. When the external resistance is 4.3 Ω (that is 700 uA) and

the external capacitance is 220 pF, the pulse width is 0.4 usec.

2) Clamp pulse position

CLAMP SW (pin 3 )

When pin 3 is "M" or "L", fixing a higher-priority signal to the

trailing edge results in occurrence of a clamp pulse. When pin 3

is 'H", and only GREEN is input, clamp pulse occurs at the

trailing edge. A clamp pulse also occurs at the leading edge

VD portion

Output at pin 14 when pin 10 is "L"

Output at pin 15 when pin 10 is "H" or OPEN

VD portion

Output at pin 15 when pin 10 is "L"

11

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