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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： | 10/20页 |
| 文件大小： | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-18/20
Continued from preceding page.
Parameter
Symbol
Test
point
Input
signal
Test method
SW20
SW25
V OUT H
V OUT M
Vertical output voltage
V OUT L
Z-20B
I-14A :
Horizontal
vertical sync
signal
Measure the voltage for each vertical output at
Z-20B.
OFF
Vertical external trigger load
resistance
RTR
Z-20B
O-20C
I-14A :
Horizontal
sync signal
Turn on SW20 and set V,VR to a maximum and
then decrease slowly until the vertical output period
becomes 225H.
Turn off SW20 and measure the resistance
between O-20C and GND.
ON
↓
OFF
B
Vertical automatic sync stop
voltage
VSAS
I-20A
Z-22
I-14A :
Horizontal
vertical sync
signal
Use the vertical output at Z-20B to synchronize an
oscilloscope and monitor the output waveform at
Z-22.
Connect a DC power supply to I-20A and raise the
voltage slowly until the output waveform becomes
larger.
Measure the voltage at I-20A at that moment.
OFF
B
Horizontal AFC gate
release voltage
VGS
Z-22
Z-20A
I-14A :
Horizontal
sync signal
Connect a DC power supply to I-20A and set it at
0V. Monitor the AFC1 waveform at Z-22 and raise
the supply voltage at Z-20A slowly until the AFC1
waveform for the vertical sync's equivalent pulse
period changes.
Measure the voltage at Z-20A at that moment.
OFF
B
Vertical output pulse start
VCC voltage
SVV
Z-20B
VCC
I-14A :
No signal
(open)
Raise VCC (pins 40, 44, and 45) from 0V slowly
until a pulse signal appears in the vertical output at
Z-20B. Measure VCC at that moment.
OFF
B
Horizontal free-running
frequency deviation
fH
O-25
I-14A :
No signal
(open)
Connect a counter to O-25 (horizontal output) to
measure the horizontal free-running frequency.
Calculate the deviation from 15.680kHz.
OFF
B
Dependence of horizontal
free-running
frequency on VCC
fHVCC
O-25
I-14A :
No signal
(open)
Connect a DC power supply to ICC (horizontal pin
24 VCC) and set it at 6.0V. And then measure the
horizontal output frequency at TP14 and calculate
the deviation from the horizontal free-running
frequency.
OFF
B
Horizontal pull-in range
fHPULL
O-25
I-14A
I-14A :
Horizontal
sync signal
Monitor the horizontal sync signal and the
horizontal output at O-25 using an oscilloscope
and vary the horizontal sync signal frequency to
measure the pull-in range.
OFF
B
Horizontal output pulse start
VCC voltage
SHV
O-25
ICC
I-14A :
No signal
(open)
Connect a DC power supply to ICC (horizontal pin
24 VCC) and raise it from 0V slowly until a pulse
signal appears in the horizontal output at O-25.
Measure the Icc pin voltage at that moment.
OFF
B
FBPH
FBPM
AFC2 FBP peak value
FBPL
Z-26B
I-14A :
Horizontal
sync signal
Measure the FBP peak value at Z-26B.
OFF
B
Continued on next page.
0V
V OUT H
V OUT M
V OUT L
FBPH
FBPL
FBPM
0V
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