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參數資料
| 型號： | LA76818A |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP54 |
| 封裝： | 0.600 INCH, DIP-54 |
| 文件頁數： | 2/44頁 |
| 文件大小： | 289K |
| 代理商： | LA76818A |
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LA76818A
No.8047-10/44
5. Before measurement, adjust the DAC as follows.
Parameter
Test point
Input signal
Adjustment
Video
Level DAC
46
SG6, 80dB
Set the output level at pin 46 as close to 2.0Vp-p as possible.
VIF Block Test Conditions
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
Maximum RF AGC
voltage
VRFH
4
SG1
80dB
Measure the DC voltage at pin 4.
RF.AGC = "000000"
Minimum RF AGC
voltage
VRFL
4
SG1
80dB
Measure the DC voltage at pin 4.
RF.AGC = "111111"
(@DAC =
0)
RFAGC0
4
Obtain the input level at which the DC voltage at
pin 4 becomes 4.5V.
RF.AGC = "000000"
RF AGC
Delay Pt
(@DAC =
63)
RFAGC63
SG1
Obtain the input level at which the DC voltage at
pin 4 becomes 4.5V.
RF.AGC = "111111"
Input sensitivity
Vi
46
SG6
Using an oscilloscope, observe the level at pin 46
and obtain the input level at which the waveform's
p-p value becomes 1.4Vp-p.
No-signal
video output voltage
VOn
46
No signal
Set IF AGC = “1” and measure the DC voltage at
pin 46.
Sync signal tip level
VOtip
46
SG1
80dB
Measure the DC voltage at pin 46.
Video output
amplitude
VO
46
SG6
80dB
Using an oscilloscope, observe the level at pin 46
and measure the waveform’s p-p value.
Video S/N
S/N
46
SG1
80dB
Measure the noise voltage at pin 46 with an RMS
voltmeter through a 10kHz to 5.0MHz band-pass
filter. Vsn
20Log (1.43/Vsn).
C-S beat level
IC-S
46
SG1
SG2
SG3
Input a 80dB
SG1 signal and measure the
DC voltage at pin 3. V3
Mix SG1 = 74dB
, SG2 = 64dB, and SG3 =
64dB
to enter the mixture in the VIF IN. Apply V3
to pin 3 from an external DC power supply. Using a
spectrum analyzer, measure the difference
between pin 46’s 4.43MHz component and
1.07MHz component.
Differential gain
DG
46
SG5
80dB
Using a vector scope, measure the level at pin 46.
Differential phase
DP
46
SG5
80dB
Using a vector scope, measure the level at pin 46.
Maximum AFT
output voltage
VAFTH
10
SG4
80dB
Set and input the SG4 frequency to 37.9MHz to be
input. Measure the DC voltage at pin 10 at that
moment.
Minimum AFT
output voltage
VAFTL
10
SG4
80dB
z
Set and input the SG4 frequency to 39.9MHz to be
input. Measure the DC voltage at pin 10 at that
moment.
AFT detection
sensitivity
VAFTS
10
SG4
80dB
z
Adjust the SG4 frequency and measure frequency
deviation
f when the DC voltage at pin 10
changes from 1.5V to 3.5V.
VAFTS = 2000/
f [mV/kHz]
Continued on next page.
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