lm2466 National Semiconductor Corporation, lm2466 Datasheet

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lm2466

Manufacturer Part Number
lm2466
Description
Monolithic Triple 7.5 Ns Crt Driver
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2002 National Semiconductor Corporation
LM2466
Monolithic Triple 7.5 ns CRT Driver
General Description
The LM2466 is an integrated high voltage CRT driver circuit
designed for use in color monitor applications. The IC con-
tains three high input impedance, wide band amplifiers
which directly drive the RGB cathodes of a CRT. Each
channel has its gain internally set to −20 and can drive CRT
capacitive loads as well as resistive loads present in other
applications, limited only by the package’s power dissipation.
The IC is packaged in an industry standard 9-lead TO-220
molded plastic power package. See the Thermal Consider-
ations section for more information.
Schematic Diagram
FIGURE 1. Simplified Schematic Diagram
DS200436
(One Channel)
Features
n Higher gain to match LM126X CMOS preamplifiers
n 0V to 3.75V input range
n Stable with 0–20 pF capacitive loads and inductive
n Convenient TO-220 staggered lead package style
n Maintains standard LM243X Family pinout which is
Applications
n 1024 x 768 displays up to 85 Hz refresh
n Pixel clock frequencies up to 95 MHz
n Monitors using video blanking
peaking networks
designed for easy PCB layout
20043601
www.national.com
June 2002

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lm2466 Summary of contents

Page 1

... LM2466 Monolithic Triple 7.5 ns CRT Driver General Description The LM2466 is an integrated high voltage CRT driver circuit designed for use in color monitor applications. The IC con- tains three high input impedance, wide band amplifiers which directly drive the RGB cathodes of a CRT. Each channel has its gain internally set to − ...

Page 2

... Connection Diagram Note: Tab is at GND www.national.com 20043602 Top View Order Number LM2466TA 2 ...

Page 3

... V = 3.5V 250V (Note 2) +60V to +85V +8V to +15V +0V to +3.75V +15V to +75V −20˚C to +100˚ pF 50˚C DC Tests LM2466 Units Min Typical Max −18 −20 −22 1 7.5 ...

Page 4

... Note load includes parasitic capacitance. Figure 2 shows a typical test circuit for evaluation of the LM2466. This circuit is designed to allow testing of the LM2466 in a 50Ω environment without the use of an expensive FET probe. The two 2490Ω resistors form a 200:1 divider with the 50Ω resistor and the oscilloscope. A test point is included for easy use of an oscilloscope probe. The compensation capacitor is used to compensate the stray capacitance of the two 2490Ω ...

Page 5

... Typical Performance Characteristics (25V−65V), Test Circuit - Figure 2 unless otherwise specified) FIGURE OUT FIGURE 4. Speed vs Temp. FIGURE 5. LM2466 Pulse Response ( 20043604 FIGURE 6. Power Dissipation vs Frequency IN 20043605 20043606 + pF OUT 20043607 20043608 FIGURE 7. Speed vs Offset ...

Page 6

... LM2466 would be subjected to during an arcover condition. Resistor R2 limits the arcover current that is seen by the diodes while R1 limits the current into the LM2466 as well as the voltage stress at the outputs of the device. R2 should ⁄ ...

Page 7

... This example assumes a capacitive load and no resistive load. TYPICAL APPLICATION A typical application of the LM2466 is shown in Figure 11 and Figure 12. Used in conjunction with an LM1267, a complete video channel from monitor input to CRT cathode can be achieved. Performance is ideal for 1024 x 768 resolution displays with pixel clock frequencies MHz ...

Page 8

... Note that the components are placed so 6.3ns / 3% that they almost line up from the output pin of the LM2466 to the blue cathode pin of the CRT connector. This is done to 5.9ns / 4% minimize the length of the video path between these two 6 ...

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9 www.national.com ...

Page 10

www.national.com 10 ...

Page 11

Application Hints (Continued) FIGURE 13. LM126X/LM246X Demo Board Layout 11 20043619 www.national.com ...

Page 12

Application Hints (Continued) FIGURE 14. Trace Routing and Component Placement for Blue Channel Output www.national.com 20043614 12 ...

Page 13

... Physical Dimensions inches (millimeters) unless otherwise noted CONTROLLING DIMENSION IS INCH VALUES ARE MILLIMETERS NS Package Number TA09A Order Number LM2466TA 13 www.national.com ...

Page 14

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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