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參數(shù)資料
| 型號： | LA76850 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Monolithic Linear IC Black & White Television IC |
| 中文描述： | 單片線性集成電路黑色 |
| 文件頁數(shù)： | 9/31頁 |
| 文件大小： | 295K |
| 代理商： | LA76850 |
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LA76850
NoA0017-9/31
VIF Block Test Conditions
Input signal
Symbol
Test point
4
Input signal
Test method
Bus conditions
Maximum RF AGC
voltage
Minimum RF AGC
voltage
RF AGC Delay Pt
(@DAC = 0)
RF AGC Delay Pt
(@DAC = 63)
Input sensitivity
VRFH
SG1
80dB
μ
SG1
80dB
μ
SG1
Measure the DC voltage at pin 4.
RF.AGC = "000000"
VRFL
Measure the DC voltage at pin 4.
RF.AGC = "111111"
RFAGC0
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"
RFAGC63
SG1
SG6
RF.AGC = "111111"
Vi
No-signal
video output
voltage
Sync signal tip
level
Video output
amplitude
Video S/N
VOn
No signal
VOtip
SG1
80dB
μ
SG6
80dB
μ
SG1
80dB
μ
Measure the DC voltage at pin 29.
VO
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 80dB
μ
SG1 signal and measure the DC
voltage (V3) at pin 3. Mix SG1 = 74dB
μ
, SG2 = 64
dB
μ
, and SG3 = 64 dB
μ
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.
S/N
C-S beat level
IC-S
SG1
SG2
SG3
Differential gain
DG
SG5
80dB
μ
SG5
80dB
μ
SG4
80dB
μ
Differential phase
DP
Using a vector scope, measure the level at Pin 29.
Maximum AFT
output voltage
VAFTH
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]
Minimum AFT
output voltage
AFT detection
sensitivity
VAFTL
SG4
80dB
μ
z
VAFTS
SG4
80dB
μ
z
Continued on next page.
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4
4
29
29
29
29
29
29
10
29
29
10
10
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