LM1269NA National Semiconductor, LM1269NA Datasheet - Page 10

• Manufacturer Part Number: LM1269NA
• Description: IC,TV/VIDEO CIRCUIT,CRT Circuit,CMOS,DIP,24PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LM1269NA

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

www.national.com
Pin No.
Pin Descriptions
18
19
20
21
22
23
24
Blue Video Out
Green Video Out
Red Video Out
V
ABL
Clamp Pulse
H Flyback
Ref
Pin Name
Out
(Continued)
Schematic
10
Video outputs of the LM1269. The ideal
driver for this part is the LM246X CRT driver
family, which has the necessary gain of 26
dB or 20 V/V.
A 0.1 µF capacitor must be placed close to
this pin for decoupling the internal V
pin may be used for an external voltage
reference with proper buffering.
The Auto Beam Limit control reduces the
gain of the video amplifier in response to a
control voltage proportional to the CRT beam
current. The ABL acts identically on all three
channels. ABL is required for CRT life and
X-ray protection.
This input accepts a standard TTL or CMOS
input. A positive signal activates the clamp
pulse for DC restoration of the video input.
The AC coupling capacitors at the video
inputs are used for holding the DC correction
voltage, eliminating the need for additional
capacitors.
H flyback is an analog signal input from the
monitor horizontal scan. The LM1269 is able
to generate an accurate blanking pulse in
the video outputs from this input. The
horizontal flyback from the monitor must be
a clean signal, with no ringing or other noise
on the signal.
Description
Ref
. This