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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： | 9/20页 |
| 文件大小： | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-17/20
Deflection block Input signals and test conditions
Set up the following conditions unless otherwise specified for each test item.
(VIF, SIF blocks : No signal)
1. EXT VIDEO IN :
Horizontal vertical composite signal (1Vp-p, same as for video block, chroma block)
(I-14A)
Horizontal sync signal only (0.5Vp-p, pulse width 4.7s)
Open
2. SW conditions : All SW's turned off unless otherwise specified
3. VCC, ICC conditions : VCC = 7.8V, ICC = 12mA
Parameter
Symbol
Test
point
Input
signal
Test method
SW20
SW25
[Deflection block]
TV free
50
Z-20B
I-14A :
No signal
With Z-21 connected to GND, measure the vertical
output period at Z-20B and calculate the ratio to the
horizontal period.
OFF
B
Vertical free-running period
TV free
60
Z-20B
I-14A :
No signal
With 7.8V applied to Z-21, measure the vertical
output period and calculate the ratio to the
horizontal period.
OFF
B
TV max50
Z-20B
I-14A :
Horizontal
sync signal
With Z-21 connected to GND, measure the vertical
output period at Z-20B and calculate the ratio to the
horizontal period.
OFF
B
Vertical sync maximum
period
TV max60
Z-20B
I-14A :
Horizontal
sync signal
With 7.8V applied to Z-21, measure the vertical
output period and calculate the ratio to the
horizontal period.
OFF
B
TV min50
Z-20B
O-25
I-14A :
Horizontal
sync signal
Apply 8.5V and 0V to Z-27B and Z-21,
respectively. Turn off SW20 and make adjustments
so that the resistance between O-20 and GND
becomes 4.7k
and then turn on SW20.
Calculate the ratio between the vertical output
period at Z-20B and the horizontal output period at
O-25.
OFF
↓
ON
B
Vertical sync minimum
period
TV min60
Z-20B
O-25
I-14A :
Horizontal
sync signal
Apply 8.5V and 7.8V to Z-27B and Z-21,
respectively.
Make measurements in the same manner as for
TV min 50.
OFF
↓
ON
B
Vertical blanking pulse peak
value
VHVBL
O-32
I-14A :
Horizontal
vertical sync
signal
Measure the vertical blanking pulse peak value in
the video output at O-32.
(GND is assumed to be 0V.)
OFF
B
PW BLK50
O-32
I-14A :
Horizontal
sync signal
With Z-21 connected to GND, measure the vertical
blanking pulse width in the video output at O-32
and calculate the ratio to the horizontal period.
OFF
B
Vertical blanking pulse
width
PW BLK60
O-32
I-14A :
Horizontal
sync signal
With 7.8V applied to Z-21, measure the vertical
blanking pulse width in the video output at O-32
and calculate the ratio to the horizontal period.
OFF
B
Vertical output pulse width
PWVOUT
Z-20B
I-14A :
Horizontal
vertical sync
signal
Measure the vertical output width at Z-20B and
calculate the ratio to the horizontal period.
OFF
B
Continued on next page.
0V
PWOUT
3V
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