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參數(shù)資料
| 型號： | LA7688B |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP52 |
| 封裝： | 0.600 INCH, DIP-52 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大小： | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-8/20
Applied voltage (V)
Parameter
Symbol
Test
point
Input
symbol
Test method
TPO-2
TPZ-46
[VIF block]
RF AGC voltage max
V50H
TPO-50
SG1,
fp = 38.9MHz cw,
85dB
Measure the level at TP0-50 using a
DC digital voltmeter.
7.8V
Open
RF AGC voltage min
V50L
TPO-50
Same as above
0
Open
Input sensitivity
VI
TPO-8
+100k
SIG1
fp = 38.9MHz
fm = 400Hz
AM = 40%
mod
Monitor the level at TP0-8 using an
oscilloscope with a resistor of 100k
connected to TP0-8.
Measure the VIF input level at which
the 400Hz demodulation signal level
becomes 0.8Vp-p.
VR center
Open
AGC range
GR
TPO-8
Same as above
Monitor the level at TP0-8 using an
oscilloscope and measure the VIF input
level at which the 400Hz demodulation
signal level becomes 0.8Vp-p. Assign
the measured value to VI.
GR = 20log (VI’/VI) [dB]
VR center
7.8V
Maximum allowable input
VImax
TPO-8
SG1
fp = 38.9MHz,
fm = 15kHz,
AM = 78% mod
Increase the VIF input relative to the
output level at TO0-8 when the VIF
input is 80dB
and measure the VIF
input level at which the output level
increases by 1dB.
VR center
Open
No-signal video output
voltage
V8
TPO-8
No-signal
Measure the level at TO0-8 using a DC
digital voltmeter.
VR center
7.8V
Sync signal tip voltage
V8TIP
TPO-8
SG1,
fp = 38.9MHz
cw, 80dB
Same as above
VR center
Open
Video output amplitude
VO8
TPO-8
SIG
fp = 38.9MHz,
fm = 15kHz,
AM = 78% MOD
80dB
Monitor the level at TP0-8 using an
oscilloscope and measure the p-p
value of the 15kHz demodulation
waveform.
VR center
Open
Black noise threshold
voltage
VBTH
TPO-8
SG1
fp = 38.9MHz
fm = 400Hz
AM 78% MOD
Connect an oscilloscope to TP0-8 and
input a sweep signal to the VIF input.
Apply voltage to TPZ-46 externally and
adjust it as shown below.
VR center
Variable
Black noise clamp voltage
VBCL
TPO-8
Same as above
Measure the level at clamp voltage of
shown above.
VR center
Variable
Video S/N
S/N
TPO-8
SG1,
fp = 38.9MHz
cw, 80dB
Using an RMS voltmeter, measure a
noise voltage generated at TO0-8
through a band-pass filter of 10kHz to
5MHz.
S/N = 20log (1.43 (Vp-p) /noise voltage
(Vrms) ) [dB]
VR center
Open
1.07MHz beat level
I1.07
TPO-8
SG1,
fp = 38.9MHz,
cw, 80dB
SG3,
fc = 4.43MHz,
cw, 70dB
SG4,
fs = 5.5MHz,
cw, 70dB
Mix the SG1 signal, SG3 signal, and
SG4 signal and input the mixed signal
to VIF IN. (The level at VIF IN must be
as shown left.)
Connect an oscilloscope and a
spectrum analyzer to TP0-8 and
adjust the external voltage at TPZ-46
so that the lower end of the
demodulation waveformbecomes 3V.
Measure the differential component
between 4.43MHz and 1.07MHz using
the spectrum analyzer.
VR center
Variable
Continued on next page.
Clamp level
VBTH
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