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參數(shù)資料
| 型號(hào)： | LA76070 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | NTSC Color Television IC |
| 中文描述： | NTSC制式彩色電視芯片 |
| 文件頁數(shù)： | 11/27頁 |
| 文件大?。?/td> | 308K |
| 代理商： | LA76070 |
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Parameter
Symbol
Measurement
point
Input signal
Measurement procedure
Bus conditions
[VIF Block]
AFT output voltage with no signal
VAFTn
No signal
Measure the pin 13 DC voltage when
IF.AGC. DEF is "1"
After performing the adjustments
described in section 4
Video output voltage with no signal
VOn
No signal
Measure the pin 45 DC voltage when
IF.AGC. DEF is "1"
After performing the adjustments
described in section 4
Connect an oscilloscope to pin 45 and modify
the SG4 signal to be a frequency above 45.75
MHz so that the PLL circuit becomes unlocked.
(Beating will occur in this state.) Gradually
lower the SG4 frequency and measure the
frequency at which the PLL circuit locks.
Similarly, modify the frequency to a value
below 45.75 MHz so that the PLL circuit
becomes unlocked. Gradually raise the SG4
frequency and measure the frequency at which
the PLL circuit locks.
SG4
93 dBμ
After performing the adjustments
described in section 4
APC pull-in range (U), (L)
fPU, fPL
Maximum RF AGC voltage
V
RFH
SG1
91 dBμ
Set the RF AGC DAC to 0 and measure the pin
6 DC voltage
After performing the adjustments
described in section 4
Minimum RF AGC voltage
V
RFL
SG1
91 dBμ
Set the RF AGC DAC to 63 and measure the
pin 6 DC voltage
After performing the adjustments
described in section 4
RF AGC Delay Pt
(@DAC = 0)
Set the RF AGC DAC to 0 and determine the
input level such that the pin 6 DC voltage
becomes 3.8 V ±0.5 V
After performing the adjustments
described in section 4
RFAGC0
SG1
RF AGC Delay Pt
(@DAC = 63)
Set the RF AGC DAC to 63 and determine the
input level such that the pin 4 DC voltage
becomes 3.8 V ±0.5 V
After performing the adjustments
described in section 4
RFAGC63
SG1
SG4
93 dBμ
Set the SG4 signal frequency to 44.75 MHz
and input that signal. Measure the pin 13 DC
voltage at that time.
After performing the adjustments
described in section 4
Maximum AFT output voltage
VAFTH
SG4
93 dBμz
Set the SG4 signal frequency to 46.75 MHz
and input that signal. Measure the pin 13 DC
voltage at that time.
After performing the adjustments
described in section 4
Minimum AFT output voltage
VAFTL
Modify the SG4 frequency to determine the
frequency deviation (
f) such that the pin
13 DC voltage changes from 2.5 V to 5.0 V.
VAFTS = 2500/
f [mV/kHz]
Observe pin 45 with an oscilloscope and
measure the p-p value of the waveform
AFT detection sensitivity
VAFTS
SG4
93 dBμz
After performing the adjustments
described in section 4
Video output amplitude
VO
SG7
93 dBμ
After performing the adjustments
described in section 4
Synchronization signal tip level
VOtip
SG1
93 dBμ
Measure the pin 45 DC voltage
After performing the adjustments
described in section 4
After performing the adjustments
described in section 4
Input sensitivity
Vi
SG7
SG7
100 dBμ
After performing the adjustments
described in section 4
Video-to-sync ratio (@ 100 dBμ)
V/S
Differential gain
DG
SG5
93 dBμ
Measure pin 45 with a vectorscope
After performing the adjustments
described in section 4
Differential phase
DP
SG5
93 dBμ
Measure pin 45 with a vectorscope
After performing the adjustments
described in section 4
Pass the noise voltage that occurs on pin
45 through a 10 kHz to 4 MHz bandpass filter,
measure that voltage (Vsn) with an rms
voltmeter. Use that value to calculate 20
×
log
(1.43/Vsn).
SG1
93 dBμ
After performing the adjustments
described in section 4
Video signal-to-noise ratio
S/N
Input SG1 at 93 dBμ and measure the pin
12 DC voltage (V12).Mix three signals: SG1 at
87 dBμ, SG2 at 82 dBμ, and SG3 at 63 dBμ,
and input that signal to VIF IN. Now, apply the
V12 voltage to pin 12 using an external power
supply. Measure the difference between the
3.58 MHz component and the 920 kHz
component with a spectrum analyzer.
SG1
SG2
SG3
920 kHz beat level
I920
After performing the adjustments
described in section 4
No. 5844-11/27
LA76070
13
45
45
6
6
6
6
13
13
13
45
45
45
45
45
45
45
45
Observe pin 45 with an oscilloscope and measure
the peak-to-peak value of the waveform. Next,
gradually lower the input level to determine the input
level such that the output becomes –3 dB below the
video signal amplitude VO.
Observe pin 45 with an oscilloscope and
determine the value of the Vy/Vs ratio by
measuring the
peak-to-peak
value of the sync
waveform (Vs) and the
peak-to-peak
value of the
luminance signal (Vy).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LA76075 | NTSC Color Television Sets |
| LA7615 | Single-Chip NTSC Color TV IC |
| LA7620 | Color TV Video, Chroma, Deflection Circuit |
| LA7625 | Video, Chroma and Deflection Circuit for Color Television Sets |
| LA7629 | Color TV/Video,Chroma,Deflection Circuit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA76075 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:NTSC Color Television Sets |
| LA7612A | 制造商:SANYO Semiconductor Co Ltd 功能描述: |
| LA7615 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Single-Chip NTSC Color TV IC |
| LA7620 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Color TV Video, Chroma, Deflection Circuit |
| LA7621 | 制造商:Panasonic Industrial Company 功能描述:IC |
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