LM2467 datasheet(12/43 Pages) NSC

12 / 43 page

Pin Descriptions and Application Information (Continued)

No.

Pin Name

Schematic

Description

SCL

The I

2C compatible clock line. A pull-up resistor

of about 2 k

Ω should be connected between this

pin and V

CC. A resistor of at least 100

Ω should

be connected in series with the clock line for

additional ESD protection.

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

compatible bus. A resistor of at least 100

Ω

should be connected in series with these outputs

for additional ESD protection.

Ground

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.

Green Output

Red Output

Blue Output

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.

ABL

The Automatic Beam Limiter input is biased to

the desired beam current limit by R

ABL and VBB

and normally keeps D

INT forward biased. When

the current resupplying the CRT capacitance

(averaged by C

ABL) exceeds this limit, then DINT

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.

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