LA76850 查看數據表（PDF） - SANYO -> Panasonic
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LA76850 Datasheet PDF : 31 Pages
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LA76850
VIF Block Test Conditions
Input signal
Maximum RF AGC
voltage
Minimum RF AGC
voltage
RF AGC Delay Pt
(@DAC = 0)
RF AGC Delay Pt
(@DAC = 63)
Input sensitivity
Symbol
VRFH
VRFL
RFAGC0
RFAGC63
Vi
Test point
4
4
4
4
29
No-signal
video output
voltage
Sync signal tip
level
Video output
amplitude
Video S/N
VOn
29
VOtip
29
VO
29
S/N
29
C-S beat level
IC-S
29
Differential gain
Differential phase
Maximum AFT
output voltage
Minimum AFT
output voltage
AFT detection
sensitivity
DG
29
DP
29
VAFTH
10
VAFTL
10
VAFTS
10
Input signal
SG1
80dBµ
SG1
80dBµ
SG1
SG1
SG6
No signal
Test method
Measure the DC voltage at pin 4.
Bus conditions
RF.AGC = "000000"
Measure the DC voltage at pin 4.
RF.AGC = "111111"
Obtain the input level at which the DC voltage at
pin 4 becomes 4.5V.
Obtain the input level at which the DC voltage at
pin 4 becomes 4.5V.
Using an oscilloscope, observe the level at pin 29
and obtain the input level at which the waveform's
p-p value becomes 1.4Vp-p.
Set IF AGC = “1” and measure the DC voltage at
pin 29.
RF.AGC = "000000"
RF.AGC = "111111"
SG1
80dBµ
SG6
80dBµ
SG1
80dBµ
SG1
SG2
SG3
SG5
80dBµ
SG5
80dBµ
SG4
80dBµ
SG4
80dBµz
SG4
80dBµz
Measure the DC voltage at pin 29.
Using an oscilloscope, observe the level at pin 29
and measure the waveform’s p-p value.
Measure the noise voltage (Vsn) at pin 29 with an
RMS voltmeter through a 10kHz to 5.0MHz
band-pass filter and calculate 20 log (1.43/Vsn).
Input a 80dBµ SG1 signal and measure the DC
voltage (V3) at pin 3. Mix SG1 = 74dBµ, SG2 = 64
dBµ, and SG3 = 64 dBµ 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 29’s 4.43MHz
component and 1.07MHz component.
Using a vector scope, measure the level at Pin 29.
Using a vector scope, measure the level at Pin 29.
Set and input the SG4 frequency to 37.9MHz to be
input. Measure the DC voltage at pin 10 at that
moment.
Set and input the SG4 frequency to 39.9MHz to be
input. Measure the DC voltage at pin 10 at that
moment.
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.
NoA0017-9/31
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