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参数资料
| 型号： | LA7688B |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP52 |
| 封装： | 0.600 INCH, DIP-52 |
| 文件页数： | 11/20页 |
| 文件大小： | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-19/20
Continued from preceding page.
Parameter
Symbol
Test
point
Input
signal
Test method
SW20
SW25
Horizontal output pulse
width
PWHOUT
O-25
I-14A :
Horizontal
sync signal
Measure the horizontal output pulse width at O-25.
OFF
B
HPF
O-25
I-14A
I-14A :
Horizontal
sync signal
Measure the time from when the horizontal output
pulse at O-25 rises until the horizontal sync signal
at I-14A falls.
OFF
A
HPCEN
O-25
I-14A
I-14A :
Horizontal
sync signal
Measure the time from when the horizontal output
pulse at O-25 rises until the horizontal sync signal
at I-14A falls.
OFF
B
Horizontal output pulse
phase
HPR
O-25
I-14A
I-14A :
Horizontal
sync signal
Measure the time from when the horizontal output
pulse at O-25 rises until the horizontal sync signal
at I-14A falls.
OFF
C
Burst gate pulse width
PWBGP
Z-26B
I-14A
I-14A :
Horizontal
vertical sync
signal
Measure the burst gate level width at Z-26B.
OFF
B
Burst gate pulse phase
TdBGP
Z-26B
I-14A
I-14A :
Horizontal
vertical sync
signal
Measure the delay time from when the horizontal
output pulse at I-14A rises until the burst gate pulse
at Z-26B falls.
OFF
B
V50
Z-21
I-14A :
No signal
Connect Z-21 to GND once and then bring it into
open state. And then measure the voltage at Z-21.
OFF
B
50/60 output voltage
V60
Z-21
I-14A :
No signal
Pull Z-21 up to VCC once and then bring it into
open state. And then measure the voltage.
OFF
B
50/60 input voltage
VIN50
Z-21
I-14A :
No signal
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.
OFF
B
VIN60
Z-21
I-14A :
No signal
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.
OFF
B
SECAM V pulse peak value
SVH
Z-26B
I-14A :
No signal
Measure the peak value for the V period at Z-26B.
OFF
B
SECAM V pulse width
SVW
Z-26B
I-14A :
No signal
Measure the width for the V period at Z-26B.
OFF
B
PWBGP
TdBGP
5V
0.25V
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