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Input signal
Symbol
Vertical linearity@16
Vlin16
LA76810A
Test point
23
Input signal
Y IN:
Horizontal/
vertical sync
signal
PAL
Test method
Monitor the pin 23 vertical ramp output and
measure the voltage at line 24, line 167 and 310.
Assign the respective measured values to Va, Vb
and Vc. Calculate as follows:
Vlin16 = (Vb-Va)/(Vc-Vb)
Bus bit/input signal
Vertical
tt
ramp Line 310
Vertical linearity@0
Vlin0
Line 167
Line 24
Y IN:
Monitor the pin 23 vertical ramp output and
VLIN: 00000
23
Horizontal/
measure the voltage at line 24, line 167 and 310.
vertical sync Assign the respective measured values to Va, Vb
signal
and Vc. Calculate as follows:
PAL
Vlin0 = (Vb-Va)/(Vc-Vb)
Vertical
tt
ramp Line 310
Vertical linearity@31
Vlin31
Line 167
Line 24
Y IN:
Monitor the pin 23 vertical ramp output and
VLIN: 11111
23
Horizontal/
measure the voltage at line 24, line 167 and 310.
vertical sync Assign the respective measured values to Va, Vb
signal
and Vc. Calculate as follows:
PAL
Vlin31 = (Vb-Va)/(Vc-Vb)
Vertical
tt
ramp Line 310
Line 167
Line 24
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