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參數(shù)資料
| 型號(hào)： | STV2246 |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| 中文描述： | 250 的低電流運(yùn)算，低反向泄露，低噪聲穩(wěn)壓二極管 |
| 文件頁(yè)數(shù)： | 19/76頁(yè) |
| 文件大?。?/td> | 2157K |
| 代理商： | STV2246 |
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STV223XD/224XC - FUNCTIONAL DESCRIPTION
19/76
At shutdown, horizontal pulses are disabled when
V
CC1
is less than 5.4 V or when V
CCD
is less than
3.5 V.
The horizontal output pulse may be disabled via
the bus (force a high level on HOUT).
Safety input on BCL Pin. When the BCL Pin is
switched to ground, the horizontal output pulse is
disabled and the inhibition of horizontal output
pulse is maintained until V
CC1
is less than 3 V
(V
CC1
power supply is switched off). The Safety
function can be disabled via the I2C bus. When
register 15hex data D7 is set to “1”, the Safety
function is reset and no longer active.
The horizontal position adjustment is controlled via
the bus.
Bus-controlled DC output voltage for adjusting the
vertical amplitude. This voltage supply is used to
adjust the slope of the vertical sawtooth generated
by the external vertical booster.
Bus-controlled vertical position. The high level of
the vertical pulse is used to adjust the vertical po-
sition.
Bus-controlled 4/3-16/9 selection. 0.2 V is the low
level of the vertical pulse when 16/9 is selected
and 2 V when 4/3 is selected.
The Oversized Blanking function is controlled by
the voltage on the FBOSD pin. When the FBOSD
voltage is between the first and the second thresh-
olds, the OSD RGB signals are selected. When
the FBOSD voltage is greater than the second
threshold (4 V blanking threshold), the RGB out-
puts are blanked during the whole field, but not
during inserted cut-off lines (the cut-off loop is al-
ways active). The blanking feature, via the FBOSD
input pin, enables Vertical Oversize Blanking
when a 4/3 picture is displayed on a 16/9 screen in
Zoom mode. The picture outside the screen is
blanked by the Oversize Blanking pulse supplied
by the external vertical IC (STV9306).
Combined Flyback input and Super-Sandcastle
output: The line blanking level is clamped at 3 V,
the burst key pulse voltage is 5 V and vertical
pulse voltage is 2 V. The line pulse is extracted
with a 2.5 V slicing level used for RGB line blank-
ing and PLL2 control.
3.3 FILTERS
Integrated Trap Filter
Q = 1.5 (f-3dB = f0 (1-1/2Q)),
Center frequency:
– 4.43 MHz, 3.58 MHz for PAL and NTSC.
– 4.25 MHz, for SECAM
(-20 dB rejection between 4.1 MHz and
4.4 MHz).
The chroma trap filter is switched off in SVHS
mode, or in color standard search mode (standard
not identified). The trap filter can be switched off
via the bus.
Integrated Chroma Bandpass
Q = 3.5, Center frequency: 4.43 MHz, 3.58 MHz.
The Bus Control Frequency Shift is used to opti-
mize the chroma response for the video signal
from the IF stage.
Integrated Bell Filter for SECAM
Q = 16, Center frequency: 4.286 MHz.
The Bus Control Frequency Shift is used to opti-
mize the chroma response for the video signal
from the IF stage.
Integrated Luma Delay Line
Bandwidth: 8 MHz.
The Luma Delay Line is automatically adapted to
the chroma standard. For PAL BG and applica-
tions without group delay compensation, a Luma
Delay Shift of -140 ns can be selected via the I2C
bus.
Filter Tuning
All filters are tuned via a reference phase-locked
loop. The PLL is based on a trap filter, a phase
comparator and an internal loop filter (capacitor).
The reference signal is the continuous carrier
wave from the Chroma VCO (4.43 MHz or
3.58 MHz). The PLL adjusts the center frequency
of the trap until it equals the reference signal.The
PLL tuning voltage is used to adjust all other inte-
grated filters. The Bell filter is fine-tuned with a
second PLL during the frame retrace. The Bell fil-
ter tuning voltage is memorized on an external ca-
pacitor (BTUN Pin).
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| STV2246C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:I2C BUS-CONTROLLED MULTISTANDARD SINGLE CHIP TV PROCESSOR |
| STV2246H | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IC BUS-CONTROLLED MULTISTANDARD SINGLE CHIP TV PROCESSOR |
| STV2247 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:I2C bus-controlled multistandard single chip TV processor |
| STV2247C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:I2C BUS-CONTROLLED MULTISTANDARD SINGLE CHIP TV PROCESSOR |
| STV2247H | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IC BUS-CONTROLLED MULTISTANDARD SINGLE CHIP TV PROCESSOR |
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