參數(shù)資料
型號(hào)： S1D2518X01
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
元件分類(lèi)： 視頻放大器
英文描述： DB25 RJ11,4 WIRE ONLY. FEMAL
中文描述： 的I2C總線控制轉(zhuǎn)/克/乙視頻放大器
文件頁(yè)數(shù)： 23/38頁(yè)
文件大?。?/td> 457K
代理商： S1D2518X01
S1D2518X01 I
2
C BUS CONTROLLED R/G/B VIDEO AMPLIFIER FOR MONITORS
22
Preliminary
APPLICATION POINT
12V Power Routing
Because S1D2518X01 is a wideband AMP of above 150MHz, 12V power significantly affects the video
characteristics. The effects from the inductance and capacitance are different for each board, and , therefore,
some tuning is required to obtain the optimum performance. The output power, VCC2, must be separated from
VCC1 using a bead or a coil, which is parallel-connected to the damping resistor. In the case of using a coil , the
appropriate coil value is between 0.1uH to 100uH. Parallel-connected a variable resistor to the coil and control its
resistance to obtain the optimum video waveform.
(Bead use: Refer to Application Circuit )
(Moreover, bead can be replaced using a coil and variable resistor to obtain the optimum video waveform.)
VCC1 12V Power
Use a 104 capacitor and large capacitor for the power filter capacitor.
12V Output Stage Power VCC2
Do not use the power filter capacitor or use a capacitor smaller than 22pF, because it is an important factor of
video oscillation. The coil, resistor and by-pass capacitor for 27 pin B+ must be placed as close as possible to the
Vcc2 pin.
Output Stage GND2
Care must be taken during routing because it ,as an AMP output stage GND, is an important factor of video
oscillation. R/G/B clamp cap and R/G/B load resistor must be placed as close as possible to the GND2 pin. GND2
must be arranged so that it has the minimum GND loop.
R/G/B Clamp Capacitor
Use the 104 capacitor for normal R/G/B clamps.
During the clamp signal's input period, the clamp stage compares the video output's pedestal level and the level
adjusted by sub address 01. If an error is detected, current is charged/discharged to the clamp capacitor, so that
the video output pedestal level is set to the adjusted level.
The current charged/discharged to the clamp cap is about 750uA. The capacitor value is very important.
If the R/G/B clamp cap's charge current is different for each channel, the screen can first appear to be red or blue,
then later become normal when you turn the power on. In that case, it is best to change the clamp cap value to
adjust the charge/discharge time.
DC Coupling Capacitor
Select the video input DC coupling cap with sagging in mind.
Select from between 10uF and 0.1uF.
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