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M52337SP

3-CHANNEL VIDEO PREAMPLIFIER WITH OSD MIXING FUNCTION FOR HIGH-RESOLUTION COLOR DISPLAYS

MITSUBISHI ELECTRIC  

MITSUBISHI ICs (Monitor)

M52337SP

3-CHANNEL VIDEO PREAMPLIFIER WITH OSD MIXING FUNCTION

FOR HIGH-RESOLUTION COLOR DISPLAYS

C.T.1, and C.T.1' crosstalk 1 (f=50MHz) and (F=110 MHz)

1. The conditions shall be as specified in the electrical

characteristics table.

2. Input SG3 (or SG4) to pin 13 (R-ch) only, measure the output

waveform amplitude of T.P25 (T.P30 or T.P35) at this time to let

the value be VOR, VOG or VOB.

3. Crosstalk C.T.1 is found by:

VOG or VOB [VP-P]

C.T.1=20log

[dB]

(C.T.1’)

VOR [VP-P]

C.T.2 and C.T.2' crosstalk 2 (f=50MHz) and (f=110MHz)

1. Change input pin from pin 13 (R-ch) to pin 8 (G-ch), and read

output in the same manner as in the case of C.T.1 and C.T.1'.

2. Crosstalk C.T.2 is found by:

VOR or VOB [VP-P]

C.T.2=20log

[dB]

(C.T.2’)

VOG [VP-P]

C.T.3 and C.T.3' crosstalk 3 (f=50MHz) and (f=110MHz)

1. Change input pin from pin 13 (R-ch) to pin 3 (G-ch), and read

output in the same manner as in the case of C.T.1 and C.T.1'.

2. Crosstalk C.T.3 is found by:

VOR or VOG [VP-P]

C.T.3=20log

[dB]

(C.T.3’)

VOB

[VP-P]

Tr and Tf pulse characteristics 1 and pulse characteristics 2

1. The conditions shall be as specified in the electrical

characteristics table.

2. Use an active probe to measure rise Tr1 and fall Tf1 at 10 to 90%

of input pulse.

3. Then, measure rise Tr2 and fall Tf2 at 10 to 90% of output pulse

with an active probe.

4. Pulse characteristics Tr and Tf is found by:

Tr (nsec) =

Tf (nsec) =

(Tr2)2- (Tr1)2

(Tf2)2- (Tf1)2

100%

90%

10%

0%

Tr

Tf

V14th clamping pulse threshold voltage

1. The conditions shall be as specified in the electrical

characteristics table.

2. Gradually reduce SG6 level at this time, while monitoring output

(in a range of 2.0VDC), and measure SG6 level when output

becomes 0V.

W14 clamping pulse operating min. width

Gradually reduce SG6 pulse width while monitoring output this time

under the conditions of V14th. In this case as well, measure SG6

pulse width when output becomes 0V.

OTr OSD pulse characteristics 1 and OTf OSD pulse

characterisitics 2

1. The conditions shall be as specified in the electrical

characteristics table.

2. Use an active probe to measure rise OTr and fall OTf at 10 to

90% of output pulse.

Oaj1 OSD adjustment control characteristics (at max.) and

∆Oaj1 relative OSD adjustment control characteristics (at

max.)

1. The conditions shall be as specified in the electric characteristics

table.

2. Read the output width of T.P25 (T.P30 or T.P35) at this time, and

let the reading be VORA (VOGA or VOBA) to let it be Oaj1,

respectively.

3. Relative OSD adjustment control characteristics ∆Oaj1 is found

by:

∆Oaj1=VORA/VOGA, VOGA/VOBA, VOBA/VORA

Oaj2 OSD adjustment control characteristics (at min.) and

∆Oaj2 relative OSD adjustment control characteristics (at min.)

1. Follow the electrical characteristics table except changing V36 to

0V.

2. Read the output amplitude of T.P25 (T.P30 or T.P35) at this time,

and let the reading be VORB (VOGB or VOBB) to let it be Oaj2,

respectively.

3. Relative OSD adjustment control characteristics ∆Oaj2 is found

by:

∆Oaj2=VORA/VOGA, VOGA/VOBA, VOBA/VORA

OSDth OSD input threshold voltage

1. The conditions shall be as specified in the electrical

characteristics table.

2. Gradually reduce SG8 level at this time, while monitoring output,

and measure SG8 level when output is stopped to let the value

be OSDth.

V1th BLK input threshold voltage

1. The conditions shall be as specified in the electrical

characteristics table.

2. Verify at this time that no signal is output with a timing in which

output is synchronized with SG8.

3. Gradually reduce SG8 level at this time, while monitoring output,

and measure SG8 level when blanking period expires to let the

value be V1th.

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