參數(shù)資料
型號(hào): LM1236
廠商: National Semiconductor Corporation
英文描述: 150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD ROM, 512 Character RAM and 4 DACs
中文描述: 150 MHz的I2C兼容的RGB前置放大器254字符OSD光盤(pán),512個(gè)字符RAM和4 DAC的內(nèi)置
文件頁(yè)數(shù): 12/43頁(yè)
文件大小: 1898K
代理商: LM1236
Pin Descriptions and Application Information
(Continued)
Pin
No.
12
Pin Name
Schematic
Description
SCL
The I
2
C compatible clock line. A pull-up resistor
of about 2 k
should be connected between this
pin and V
CC
. A resistor of at least 100
should
be connected in series with the clock line for
additional ESD protection.
13
14
15
16
DAC 4 Output
DAC 2 Output
DAC 3 Output
DAC 1 Output
DAC outputs for cathode cut-off adjustments and
brightness control. DAC 4 can be set to change
the outputs of the other three DACs, acting as a
brightness control. The DAC values and the
special DAC 4 function are set through the I
2
C
compatible bus. A resistor of at least 100
should be connected in series with these outputs
for additional ESD protection.
17
18
Ground
V
CC
Ground pin for the output analog portion of the
LM1247 circuitry, and power supply pin for all
the analog of the LM1247. Note the
recommended charge storage and high
frequency capacitors which should be as close to
pins 17 and 18 as possible.
These are the three video output pins. They are
intended to drive the LM246x family of cathode
drivers. Nominally, about 2V peak to peak will
produce 40V peak to peak of cathode drive.
19
20
21
Green Output
Red Output
Blue Output
22
ABL
The Automatic Beam Limiter input is biased to
the desired beam current limit by R
ABL
and V
BB
and normally keeps D
INT
forward biased. When
the current resupplying the CRT capacitance
(averaged by C
ABL
) exceeds this limit, then D
INT
begins to turn off and the voltage at pin 22
begins to drop. The LM1247 then lowers the
gain of the three video channels until the beam
current reaches an equilibrium value.
L
www.national.com
12
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