參數(shù)資料
型號(hào)： LM1253AN
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 畫(huà)面疊加
英文描述： Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator
中文描述： ON-SCREEN DISPLAY IC, PDIP28
封裝： 0.600 INCH, PLASTIC, DIP-28
文件頁(yè)數(shù)： 17/57頁(yè)
文件大?。?/td> 1621K
代理商： LM1253AN
ESD and Arc-Over Protection
(Continued)
The I
2
C specification recommends that the SDA and SCL
pins should be protected from arc-over. This is done by add-
ing a resistor in series with each pin. Figure 27 shows how
the resistors are connected to the SDA and SCL lines.
Pre-Amp Functional Description
Figure 1 shows the block diagram of the LM1253A. The
video signal is input to the LM1253A through the circuit
shown in Figure 26 Black level clamping is carried out di-
rectly on the AC coupled input signal at the input of the high
impedance buffer amplifier, thus eliminating the need for
black level clamp capacitors. The following sections then
modify the input video signal:
Contrast Attenuator—Sets the contrast level of the video
signal for all three channels.
Auto Beam Limit—Reduces the gain of all three video
amplifiers in response to a control voltage proportional to
the CRT beam current.
Gain Attenuator—Separately sets the gain for each
video channel.
Brightness—Sets the brightness for all three channels.
Bias—Adds an offset to the brightness controls for all
three video channels.
Pedestal—Adds a dc voltage offset to the brightness
control, in order that bi-directional control of the bright-
ness control is always possible at all bias voltage set-
tings.
Source Select—Switches between the input video signal
and the analog OSD signal generated by the 3 bit pallet
DAC control block.
DC Offset—Adds a dc voltage offset to all three video
outputs.
The above sections use the registers shown in Table 2 Fig-
ure 28 shows which section of the output video and clamp
signal each register controls.
DS101265-29
FIGURE 26. Recommended Video Input ESD Protection
DS101265-30
FIGURE 27. Recommended Arc-Over Protection for
SDA and SCL Pins
L
www.national.com
17
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