參數(shù)資料
型號： LM1253
廠商： National Semiconductor Corporation
英文描述： Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator
中文描述： 單片三180兆赫的I2C顯像管預(yù)先集成在屏幕顯示（OSD）發(fā)生器模擬放大器
文件頁數(shù)： 8/57頁
文件大小： 1621K
代理商： LM1253
Test Settings
TABLE 1. Control Test Settings
Control
No.
of
Bits
7
Basic
Test
Setting 1
Max
(Hex 7F)
Max
(Hex 7F)
Max
(Hex FF)
Max
(Hex FF)
Min
(Hex 07)
Max
(Hex 07)
Basic
Test
Setting 2
Max
(Hex 7F)
Max
(Hex 7F)
Max
(Hex FF)
Max
(Hex FF)
Max
(Hex 00)
Max
(Hex 07)
Basic
Test
Setting 3
Max
(Hex 7F)
P-P
on all Channels
Min
(Hex 00)
Min
(Hex 00)
Min
(Hex 07)
Min
(Hex 00)
Basic
Test
Setting 4
Max
(Hex 7F)
Max
(Hex 7F)
Min
(Hex 00)
Min
(Hex 00)
Min
(Hex 07)
Min
(Hex 00)
Contrast
R,G,B Gain
7
Brightness
8
R,G,B Bias
8
DC Offset
3
Pedestal Offset
3
Pin Descriptions
Pin 1—R
V
A 10 k
1% resistor is connected to this
pin to set up the internal current sources. The LM1253A is
optimized for this value of resistor. A DC voltage only will be
on this pin. Decreasing the value of this resistor will increase
supply current while degrading performance; increasing the
value of the resistor will decrease supply current and also
degrade the performance. Do not place the resistor close to
sources of heat such as the CRT driver. Figure 29shows the
components connected to pin 1, Figure 11shows the internal
schematic of pin 1.
Pin 2—V Blank Out
This pin supplies a variable width,
negative going pulse at the vertical rate to the CRT Driver. V
Blank is triggered from the signal on pin 15, which comes
from the vertical flyback. The CRT Driver supplies the pull up
for this pin. The width of this pulse is set by the value in the
VBLANKDUR register (8403h). Figures 4, 5, 6 show the re-
sulting V Blank Out pulse with various values in register
8403h. The trace connecting pin 2 of the LM1253A to the
LM2453 must be kept away from the output circuitry of the
LM2453. Figure 29 shows the external schematic of pin 2,
Figure 12 shows the internal schematic of pin 2.
Pin 3—V
Cap
A 0.1 μF capacitor is placed close to this
pin to decouple V
. V
is used by the three video chan-
nel circuits to make the VideoPlex signal. Figure 29 shows
the external schematic of pin 3, Figure 13 shows the internal
schematic of pin 3.
Pin 4, 5, 6—Blue, Red, and Green Video In
The red, blue,
and green video signal is AC coupled into these pins. The
value of the capacitors is very important as they also serve
DS101265-7
FIGURE 4. V Blank = 10
DS101265-8
FIGURE 5. V Blank = 63
DS101265-9
FIGURE 6. V Blank = 127
L
www.national.com
8
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