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參數(shù)資料
| 型號： | 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)： | 22/27頁 |
| 文件大?。?/td> | 308K |
| 代理商： | LA76070 |
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Deflection Block - Input Signals and Measurement Conditions
Unless otherwise indicated, set up the following conditions for each of the following measurements.
1. VIF and SIF blocks: No signal
2. C input: No signal
3. SYNC input: Horizontal and vertical composite synchronizing signal (40 IRE and other conditions, such as timing,
must conform to the FCC broadcast standards.)
Caution: The burst and chrominance signals must not be below the pedestal level.
4. Bus control conditions: All conditions set to the initial conditions unless otherwise specified.
5. The delay between the rise of the horizontal output (the pin 23 output) and the rise of the F.B.P IN (the pin 24 input)
must be 9 μs.
6. Unless otherwise specified, pin 25 (the X-ray protection circuit input) must be connected to ground.
Caution:
Perform the following operation if horizontal pulse output has stopped.
1. The bus data T_ENABLE bit must be temporarily set to 0 and then set to 1.
(If the X-ray protection circuit operates, an IC internal latch circuit will be set. To reset that latch circuit, the
T_ENABLE bit must be temporarily set to 0, even if there is no horizontal output signal being output.)
Notes on Video Muting
If horizontal pulse output has stopped, perform the operation described in item 1. above and then set the video mute bit
set to 0.
(This is because the video mute bit is forcibly set to the mute setting when the T_ENABLE bit is set to 0 or when the X-
ray protection circuit operates. This also applies when power is first applied.)
No. 5844-22/27
LA76070
Parameter
Symbol
Measurement
point
Input signal
Measurement procedure
Bus conditions
[Deflection Block]
SYNC IN:
horizontal and signal input to Y IN (pin 37) and measure the
vertical
level of the synchronizing signal at the point
synchronizing synchronization is lost
signal
Gradually lower the level of the synchronizing
Sync separator circuit sensitivity
Ssync
Connect a frequency counter to the pin 23
output (Hout) and measure the horizontal free-
running frequency.
Calculate the deviation from the following formula.
fH = <measured value> – 15.734 kHz
Horizontal free-running
frequency deviation
SYNC IN:
No signal
fH
SYNC IN:
horvertical
and measure the pull-in range by modifying the
synchronizing
horizontal synchronizing signal frequency
signal
Monitor the horizontal synchronizing signal input
Horizontal pull-in range
fH PULL
SYNC IN:
horvertical
in the pin 23 horizontal output pulse
synchronizing
signal
Horizontal pulse output
saturation voltage
V Hsat
37
23
37
23
相關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 |
相關代理商/技術參數(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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