M52745SP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M52745SP

BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR

MITSUBISHI ELECTRIC  

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MITSUBISHI ICs (Monitor)

M52745SP

BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR

∆Tf Relative pulse characteristics2

Relative characteristics ∆Tf is calculated by the difference in the

output between the channels.

100%

90%

0%

Tr1 or Tr2

10%

Tf1 or Tf2

VthCP Clamp pulse threshold voltage

Turn down the SG5 input level gradually from 5.0VP-P, monitoring

the waveform output.

Measure the top level of input SG5 at when the output pedestal

level is start to going down or unstable.

WCP Clamp pulse minimum width

Decrease the SG5 pulse width gradually from 0.5 µs, monitoring the

output. Measure the input SG5 pulse width (a point of 1.5V)

when the output pedestal voltage turm decrease with unstable.

PDCH Pedestal voltage temperature characteristic1

Measure the pedestal voltage at 25°C. The measured value is

called PDC1.

Measure the pedestal voltage at temperature of -20°C. The

measured value is called PDC2.

Pedestal voltage temperature characteristics 1 is calculated by the

equation below:

P DCH =PDC1-PDC2

PDCH Pedestal voltage temperature characteristic2

Measure the pedestal voltage at 25°C. The measured value is

called PDC1.

Measure the pedestal voltage at temperature of 75°C. The

measured value is called PDC3.

Pedestal voltage temperature characteristics 2 is calculated by the

equation below:

P DCH =PDC1-PDC3

∆Oaj1 OSD adjust control relative characteristics1

Relative characteristics ∆Oaj1 is calculated by the equation below:

∆Oaj1=VOUT (24)/VOUT (28),

VOUT (28)/VOUT (31),

VOUT (31)/VOUT (24)

Oaj2 OSD adjust control characteristics2

Measuring condition and procedure are the same as described in

Oaj1.

∆Oaj2 OSD adjust control relative characteristics2

Measuring condition and procedure are the same as described in

∆Oaj1.

OBLK OSD adjust control characteristics3

Measuring condition and procedure are the same as described in

Oaj1.

∆OBLK OSD adjust control relative characteristics3

Measuring condition and procedure are the same as described in

∆Oaj1.

VthOSD OSD input threshold voltage

Reduce the SG6 input level gradually, monitoring output. Measure

the SG6 level when the output reaches 0V. The measured value is

called VthOSD.

VthBLK OSD BLK input threshold voltage

Confirm that output signal is being blanked by the SG6 at the time.

Monitoring to output signal, decreasing the level of SG6. Measure

the top level of SG6 when the blanking period is disappeared. The

measured value is called VthBLK.

VthRET Retrace BLK input threshold voltage

Confirm that output signal is being blanked by the SG7 at the time.

Monitoring to output signal, decreasing the level of SG7. Measure

the top level of SG7 when the blanking period is disappeared. The

measured value is called VthRET.

OTr OSD pulse characteristics1

Measure the time needed for the output pulse to rise from 10% to

90% (OTR) with an active prove.

OTf OSD pulse characteristics2

Measure the time needed for the output pulse to fall from 90% to

10% (OTF) with an active prove.

Oaj1 OSD adjust control characteristics1

Measure the amplitude output at OUT (24, 28, 31). The measured

value is called VOUT (24, 28, 31), and is treated as Oaj1.

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