la7688b Sanyo Semiconductor Corporation, la7688b Datasheet - Page 19

• Manufacturer Part Number: la7688b
• Description: Pal/ntsc Color Television-use Single-chip Lsi
• Manufacturer: Sanyo Semiconductor Corporation

Continued from preceding page.
Horizontal output pulse
width
Horizontal output pulse
phase
Burst gate pulse width
Burst gate pulse phase
50/60 output voltage
50/60 input voltage
SECAM V pulse peak value
SECAM V pulse width
Parameter
PWHOUT
H PF
H PCEN
H PR
P WBGP
T dBGP
V 50
V 60
V IN 50
V IN 60
S VH
S VW
Symbol
O-25
O-25
I-14A
O-25
I-14A
O-25
I-14A
Z-26B
I-14A
Z-26B
I-14A
Z-21
Z-21
Z-21
Z-21
Z-26B
Z-26B
point
Test
I-14A :
Horizontal
sync signal
I-14A :
Horizontal
sync signal
I-14A :
Horizontal
sync signal
I-14A :
Horizontal
sync signal
I-14A :
Horizontal
vertical sync
signal
I-14A :
Horizontal
vertical sync
signal
I-14A :
No signal
I-14A :
No signal
I-14A :
No signal
I-14A :
No signal
I-14A :
No signal
I-14A :
No signal
signal
Input
LA7688B
Measure the horizontal output pulse width at O-25.
Measure the time from when the horizontal output
pulse at O-25 rises until the horizontal sync signal
at I-14A falls.
Measure the time from when the horizontal output
pulse at O-25 rises until the horizontal sync signal
at I-14A falls.
Measure the time from when the horizontal output
pulse at O-25 rises until the horizontal sync signal
at I-14A falls.
Measure the burst gate level width at Z-26B.
Measure the delay time from when the horizontal
output pulse at I-14A rises until the burst gate pulse
at Z-26B falls.
Connect Z-21 to GND once and then bring it into
open state. And then measure the voltage at Z-21.
Pull Z-21 up to V CC once and then bring it into
open state. And then measure the voltage.
With 7.8V applied to Z-21, monitor the frequency at
Z-20B. Lower the voltage at Z-21 slowly until the
frequency at Z-20B changes from 60Hz to 50Hz.
Measure the voltage at Z-21 at that moment.
With 0V applied to Z-21, monitor the frequency at
Z-20B. Raise the voltage at Z-21 slowly until the
frequency at Z-20B changes from 50Hz to 60Hz.
Measure the voltage at Z-21 at that moment.
Measure the peak value for the V period at Z-26B.
Measure the width for the V period at Z-26B.
0.25V
5V
Test method
TdBGP
P WBGP
SW20
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
No.0077-19/20
SW25
B
C
B
A
B
B
B
B
B
B
B
B