LM1269 datasheet(9/20 Pages) NSC

9 / 20 page

Pin Descriptions (Continued)

Pin No.

Pin Name

Schematic

Description

Red Video In

Green Video In

Blue Video In

Video inputs. These inputs must be AC

coupled with a 4.7 nF cap. DC restoration is

done at these inputs. A series resistor of

about 33

Ω and external ESD protection

diodes should also be used for ESD

protection.

Analog Ground

Ground Pin for the analog circuits of the

LM1269.

Power supply pin for LM1269.

refRext

Sets the internal current sources through a

10 k

Ω 1% external resistor. Resistor value

and accuracy is critical for optimum

operation of the LM1269.

SDA

The I

2C data line. A pull-up resistor of about

Ω should be connected between this pin

and +5V. A 300

Ω resistor should be

connected in series with the data line for

protection against arcing.

SCL

The I

2C Clock line. A pull-up resistor of

about 2 k

Ω should be connected between

this pin and +5V. A 300

Ω resistor should be

connected in series with the clock line for

protection against arcing.

DAC4

DAC3

DAC2

DAC1

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 the brightness control. The DACs

are set through the I

2C bus.

Digital Ground

Ground Pin for the digital circuits of the

LM1269.

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