- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372368 > STV202 TV Power Schematic PDF資料下載
參數(shù)資料
| 型號： | STV202 |
| 英文描述： | TV Power Schematic |
| 中文描述： | 電視電源原理圖 |
| 文件頁數(shù)： | 33/46頁 |
| 文件大?。?/td> | 528K |
| 代理商： | STV202 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁當前第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁
STV2001
33/
46
14.4.2 - Contrast Adjustment (7 bits)
The contrast adjustment is made by simultaneous-
ly controlling the gain of three internal variable
gain amplifiers through the I
2
C bus interface. The
contrast adjustment allows covering a range high-
er than 40 dB. This adjustment is refreshed during
the vertical retrace time.
14.4.3 - ABL Control
The STV2001 has an ABL input (automatic beam
limitation) to attenuate RGB video signals accord-
ing to beam intensity.
The operating range is typically 2.5 V, from 5.3 V
to 2.8 V. A typical 12 dB Max. attenuation is ap-
plied to the signal whatever the current gain. Refer
to Figure 16 for ABL input attenuation range.
In the case of software control, the ABL input must
be pulled to AV
CC
through a resistor to limit power
consumption.
ABL input voltage must not exceed VAV
CC
. Input
resistor is 10k
.
Figure 17.
14.4.4 - Brightness Adjustment (6 bits)
As with contrast adjustment, brightness is control-
led by I
2
C.
The brightness function consists of adding the
same DC offset to the three R, G, B signals after
contrast amplification. This DC-Offset is present
only outside the blanking pulse (see
Figure 19
).
The DC output level is forced to "INFRA-BLACK"
level (V
DC
) during the blanking pulse.
14.4.5 - Drive Adjustment (3 x 8 bits)
To adjust the white balance, the device offers the
possibility of separately adjusting the overall gain
of each complete video channel. Each channel
gain is controlled by I
2
C (8 bits each). The very
large drive adjustment range (48dB) allows differ-
ent standard or custom color temperatures.
The drive adjustment is also used to adjust the
output voltages at the optimum amplitude to drive
the C.R.T drivers, keeping the whole contrast con-
trol for end-users only. The drive adjustment is
made after the contrast and brightness so that the
white balance remains correct when BRT is ad-
justed.
14.4.6 - Output Stage
The three output stages (see
Figure 18
) incorpo-
rate three functions:
The blanking stage: when the internal
generated blanking pulse is high, the three
outputs are switched to a voltage which is
400 mV lower than the BLACK level. The
black level is the output voltage with minimum
brightness when the input signal video
amplitude is equal to "0".
The output stage itself: a large bandwidth
output amplifier which can deliver up to 5V
PP
on the three outputs (for 0.7 V video signal on
the inputs).
The output CLAMP: the IC also incorporates
three internal output clamps (sample and hold
system) to fix the "INFRA-BLACK" level
(VDC) at 1.1V during blanking.
The overall waveforms of the output signal accord-
ing to the different adjustments are shown in
Figure 19.
and
Figure 20.
2
0
-2
-4
-6
-8
-10
-12
-141
2
3
4
5
6
7
8
9
Attenuation (dB)
V
IN
(V)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| STV2001 | I2C SINGLE FREQUENCY DEFLECTION PROCESSOR AND 120 MHz RGB PREAMPLIFIER |
| STV2100 | TV/Video Signal Processor |
| STV2112 | Color Decoder Circuit |
| STV2116 | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| STV2118A | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STV2040T1 | 制造商:STMicroelectronics 功能描述: |
| STV2050A | 功能描述:視頻 IC Digital Conv Procssr RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| STV205K0 | 制造商:TE Connectivity 功能描述: |
| STV2100 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:TV/Video Signal Processor |
| STV2102 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:I2C SINGLE FREQUENCY DEFLECTION PROCESSOR AND 120 MHz RGB PREAMPLIFIER |
發(fā)布緊急采購，3分鐘左右您將得到回復。