LA7615 Datasheet, PDF (31/39 Pages) Sanyo Semicon Device – Single-Chip NTSC Color TV IC

LA7615
Continued from preceding page.
Parameter
Vertical ramp output amplitude
@0
Symbol
Vsize0
Test point Input signal
SYNC IN:
horizontal and
19 ^vertical
synchronizing
signal
Test procedure
Monitor the pin 19 vertical ramp output and measure
the voltages at the 22nd line and at the 262nd line.
Calculate the following formula.
Vsize0 = Vline262 – Vline22
Bus condition
Vertical ramp output
V_SIZE: 0000000
262nd line
Vertical ramp output amplitude Vsize127
@127
22nd line
A10079
Monitor the pin 19 vertical ramp output and measure
the voltages at the 22nd line and at the 262nd line.
Calculate the following formula.
Vsize0 = Vline262 – Vline22
SYNC IN:
horizontal and
19 ^vertical
synchronizing
signal
Vertical ramp output
262nd line
V_SIZE: 1111111
[High-Voltage Dependency Vertical Size Correction]
Vertical size correction @7
(maximum)
Vsizecomp
19
[Vertical Screen Position Adjustment]
Vertical ramp DC voltage @32 Vdc32
19
SYNC IN:
horizontal and
vertical
synchronizing
signal
SYNC IN:
horizontal and
vertical
synchronizing
signal
22nd line
A10080
Monitor the pin 19 vertical ramp output and measure
the voltages at the 22nd line and at the 262nd line.
Calculate Va from the following formula.
Va = Vline262 – Vline22
Next, apply 3.8 V to pin 18, and once again measure
the voltages at the 22nd line and at the 262nd line.
Calculate Vb from the following formula.
Vb = Vline262 – Vline22
Finally, calculate Vsizecomp from the following
formula.
Vsizecomp = (Va – Vb)/Va × 100
V_COMP: 111
Monitor the pin 19 vertical ramp output and measure
the voltage at the 142nd line.
Vertical ramp output
142nd line
A10081
Vertical ramp DC voltage @0 Vdc0
Monitor the pin 19 vertical ramp output and measure
the voltage at the 142nd line.
SYNC IN:
horizontal and
19 vertical
synchronizing
signal
Vertical ramp output
142nd line
A10082
V_DC: 000000
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