M52722 Mitsubishi, M52722 Datasheet - Page 16

• Manufacturer Part Number: M52722
• Description: 3-CHANNEL VIDEO PREAMPLIFIER PROVIDED WITH OSD MIX AND RETRACE LINE BLK FOR HIGH-RESOLUTION
• Manufacturer: Mitsubishi

M52722SP
1) Clamping pulse input
VTH = 2.2 V- Diode
Clamping pulse threshold voltage VTH is calculated by the
following equation, and voltages more than 2.2 V is subject
toLIM:
Recommended clamping pulse voltage is as given in the
following
diagram:
In addition, pulse width is recommended as follows:
More than 1.0 sec at 15kHz,
More than 0.5 sec at 30kHz, and
More than 0.3 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:
Input positive polarity pulse.
= 1.5V
VTH(1.5V)
-
INSTRUCTIONS FOR USE
X
1
18
2.5V to 5.0V
0V
3-CHANNEL VIDEO PREAMPLIFIER PROVIDED WITH OSD MIX
AND RETRACE LINE BLK FOR HIGH-RESOLUTION
2) Brightness operation
The above diagram represents its principle.
2-1) Brightness pins
2-2) Sub-brightness
2-3) Capacitance value of holding capacitor
3) BLK (for OSD) and OSD input pins
•
•
•
(See page 2-1109.)Threshold voltage is 2.5V.
Input formula is on an open basis.
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.
Use within the range of 1V to 5V.
Control characteristics are as given in the following drawing:
This IC has no sub-brightness function.
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).
Signal
5
4
3
2
1
0
+
-
1
Brightness
(1 to 5V)
2
MITSUBISHI ICs (Monitor)
Brightness voltage (V)
3
19
DC level shift
+
-
4
M52722SP
5
6
16