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参数资料
| 型号： | LA76850 |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP36 |
| 封装： | 0.400 INCH, DIP-36 |
| 文件页数： | 13/13页 |
| 文件大小： | 279K |
| 代理商： | LA76850 |
LA76850
NoA0017-9/31
VIF Block Test Conditions
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
Maximum RF AGC
voltage
VRFH
SG1
80dB
Measure the DC voltage at pin 4.
RF.AGC = "000000"
Minimum RF AGC
voltage
VRFL
SG1
80dB
Measure the DC voltage at pin 4.
RF.AGC = "111111"
RF AGC Delay Pt
(@DAC = 0)
RFAGC0
SG1
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
SG6
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.
No-signal
video output
voltage
VOn
No signal
Set IF AGC = “1” and measure the DC voltage at
pin 29.
Sync signal tip
level
VOtip
SG1
80dB
Measure the DC voltage at pin 29.
Video output
amplitude
VO
SG6
80dB
Using an oscilloscope, observe the level at pin 29
and measure the waveform’s p-p value.
Video S/N
S/N
SG1
80dB
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).
C-S beat level
IC-S
SG1
SG2
SG3
Input a 80dB
SG1 signal and measure the DC
voltage (V3) at pin 3. Mix SG1 = 74dB
, SG2 = 64
dB
, and SG3 = 64 dB 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.
Differential gain
DG
SG5
80dB
Using a vector scope, measure the level at Pin 29.
Differential phase
DP
SG5
80dB
Using a vector scope, measure the level at Pin 29.
Maximum AFT
output voltage
VAFTH
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
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
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.
4
29
10
29
10
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