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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： | 20/20页 |
| 文件大小： | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-9/20
Continued from preceding page.
Applied voltage (V)
Parameter
Symbol
Test
point
Input
symbol
Test method
TPO-2
TPZ-46
Frequency characteristics
fc
TPO-8
SG2,
fp = 38.9MHz,
cw, 80dB
SG1,
fc = 38.8MHz to
25MHz, cw
66dB
Mix the SG1 signal and SG2 signal and
input the mixed signal to VIF IN. Set the
SG1 frequency at 38.8MHz and using
an oscilloscope adjust the external
voltage at TPZ-46 so that the output
level at TP0-8 becomes 3V.
And then lower the SG1 frequency until
the output level at TP0-8 becomes
0.35Vp-p. Measure the frequency at
that moment.
fc = 38.9-f [MHz]
VR center
Variable
Differential gain
DG
TPO-8
SG1,
fp = 38.9MHz,
staircase wave
AM = 87.5% MOD
80dB
Measure the level at TP0-8 using a
vector scope.
VR center
Open
Differential phase
DP
TPO-8
Same as above
VR center
Open
No-signal AFT voltage
V7
TPO-7
No-signal
Measure the level at TP0-7 using a DC
digital voltmeter.
VR center
7.8V
Maximum AFT voltage
V7H
TPO-7
SG1,
fp = 38.9MHz
±1MHz, cw,
80dB
Connect a DC digital voltmeter to
TO0-7 and vary the SG frequency
±1MHz tomeasure a maximum voltage.
VR center
Open
Minimum AFT voltage
V7L
TPO-7
Same as above
Connect a DC digital voltmeter to
TO0-7 and vary the SG frequency
±1MHz to measure a minimum voltage.
VR center
Open
AFT detection sensitivity
Sf
TPO-7
SG1
fp = 38.9MHz,
±1MHz, cw,
80dB
Connect a DC digital voltmeter to
TO0-7 and vary the SG frequency
±1MHz to measure frequency deviation
f when the voltage changes from 2V
to 7V.
Sf =
)
(
)
(
5000
kHz
f
mV
[mV/kHz]
VR center
Open
APC pull-in range (U)
fPU
TPO-8
SG5
fp = 38.9MHz
5MHz cw,
50dB
Connect an oscilloscope to TP0-8 and
set the SG5 frequency at a frequency
higher than 38.9MHz to unlock the PLL.
(The PLL is assumed to be unlocked
when a beat signal appears at TO0-8.)
When the SG5 frequency is lowered,
the PLL is unlocked again.
Measure the frequency at that moment
and assign the measured frequency to
fPU. For fPL, set the SG5 frequency at
a frequency lower than 38.9MHz and
make measurements in the
VR center
Open
APC pull-in range (L)
fPL
TPO-8
Same as above
VR center
Open
VCO1 maximum variable
range
fU
fL
TPO-8
No-signal
Connect a spectrum analyzer to TO0-8
and check to see that the VCO
oscillation frequency is 9MHz. And then
apply DC voltage to TPZ-4A and vary it.
Assign the frequency max. at TO0-8 to
fU max. and the frequency min. at
TP0-8 to fL min.
fU = fUmax-38.9MHz
fL = 38.9MHz-fLmin
VR center
7.8V
Continued on next page.
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