M52722SP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M52722SP

3-CHANNEL VIDEO PREAMPLIFIER PROVIDED WITH OSD MIX AND RETRACE LINE BLK FOR HIGH-RESOLUTION

MITSUBISHI ELECTRIC  

MITSUBISHI ICs (Monitor)

M52722SP

3-CHANNEL VIDEO PREAMPLIFIER PROVIDED WITH OSD MIX

AND RETRACE LINE BLK FOR HIGH-RESOLUTION

M52722SP - INSTRUCTIONS FOR USE

2) Brightness operation

1) Clamping pulse input

Input positive polarity pulse.

Clamping pulse threshold voltage VTH is calculated by the

following equation, and voltages more than 2.2 V is subject

toLIM:

VTH = 2.2 V- DiodeX1

= 1.5V

Recommended clamping pulse voltage is as given in the

following

diagram:

VTH(1.5V)

2.5V to 5.0V

0V

In addition, pulse width is recommended as follows:

More than 1.0µ sec at 15kHz,

More than 0.5µ sec at 30kHz, and

More than 0.3µ sec at 64kHz.

Clamping pulse wiring generally involves long stretched lines in

the set, is made from the high pressure side, and often

connected indirectly to external pins, causing strong surge input

to tend to come into. Under such circumstances, protective

circuit as given in the following diagram is recommended:

18

Signal -

+

DC level shift

-

+

Brightness 19

(1 to 5V)

The above diagram represents its principle.

2-1) Brightness pins

Use within the range of 1V to 5V.

Control characteristics are as given in the following drawing:

5

4

3

2

1

0

123 456

Brightness voltage (V)

2-2) Sub-brightness

This IC has no sub-brightness function.

2-3) Capacitance value of holding capacitor

Value necessary as IC is more than 0.01É (when fH=15kHz).

However, this depends upon hold period (time other than for

clamping), and the longer the hold time is, the greater the

value is necessary.

In terms of application, the smaller the capacitance value, the

quicker the response, and the greater the capacitance value,

the more stable the behavior.

Accordingly, set freely depending upon signals and clamping

pulse contents (especially pulse status in a vertically

synchronized timing).

3) BLK (for OSD) and OSD input pins

• Input formula is on an open basis.

(See page 2-1109.)Threshold voltage is 2.5V.

• Inputting OSD mix signal without inputting BLK pulse will cause

abnormal operation. Input BLK pulse as well whenever inputting

OSD Mix signal.

• Ensure that input pin is grounded when OSD Mix function is not

used.

16

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