LM1237BDKENANOPB National Semiconductor, LM1237BDKENANOPB Datasheet - Page 10

• Manufacturer Part Number: LM1237BDKENANOPB
• Manufacturer: National Semiconductor

Specifications of LM1237BDKENANOPB

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Package Type: MDIP
• Lead Free Status / RoHS Status: Compliant

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Pin Descriptions and Application Information
No.
Pin
11
12
13
14
15
16
17
18
19
20
21
9
DAC 4 Output
DAC 2 Output
DAC 3 Output
DAC 1 Output
Green Output
Blue Output
Red Output
Pin Name
PLL Filter
Ground
SDA
SCL
V
CC
Schematic
10
Recommended topology and values are shown
to the left. It is recommended that both filter
branches be bypassed to the independent
ground as close to pin 8 as possible. Great care
should be taken to prevent external signals from
coupling into this filter from video, I
The I
of about 2 Kohms should be connected between
this pin and V
should be connected in series with the data line
for additional ESD protection.
The I
of about 2 kΩ should be connected between this
pin and V
be connected in series with the clock line for
additional ESD protection.
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 100Ω
should be connected in series with these outputs
for additional ESD protection.
Ground pin for the output analog portion of the
LM1237 circuitry, and power supply pin for both
analog and digital sections of the LM1237. 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.
(Continued)
2
2
C compatible data line. A pull-up resistor
C compatible clock line. A pull-up resistor
CC
. A resistor of at least 100Ω should
CC
. A resistor of at least 100Ω
Description
2
C, etc.
2
C