LM2412T National Semiconductor, LM2412T Datasheet

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LM2412T

Manufacturer Part Number
LM2412T
Description
Monolithic Triple 2.8 nsec Driver
Manufacturer
National Semiconductor
Datasheet

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© 2001 National Semiconductor Corporation
LM2412
Monolithic Triple 2.8 ns CRT Driver
General Description
The LM2412 is an integrated high voltage CRT driver circuit
designed for use in high resolution color monitor applica-
tions. The IC contains three high input impedance, wide
band amplifiers which directly drive the RGB cathodes of a
CRT. Each channel has its gain internally set to −14 and can
drive CRT capacitive loads as well as resistive loads pre-
sented by other applications, limited only by the package’s
power dissipation. The LM2412 is a low power alternative of
the LM2402
The IC is packaged in an industry standard 11 lead TO-220
molded plastic power package. See thermal considerations
section for heat sinking requirements.
Features
n Rise/fall times typically 2.8 ns with 8 pF load at 40 V
Schematic and Connection Diagrams
FIGURE 1. Simplified Schematic Diagram
(One Channel)
DS101298
DS101298-1
PP
n Lower power than LM2402 with the same bandwidth
n Well matched with LM2202 video preamps
n Output swing capability: 50 V
n 1V to 5V input range
n Stable with 0-20 pF capacitive loads and inductive
n Convenient TO-220 staggered lead package style
n Standard LM240X family pinout which is designed for
Applications
n CRT driver for color monitors with display resolutions up
n Pixel clock frequency up to 200 MHz
peaking networks
easy PCB layout
to 1600 x 1200 with 85 Hz refresh rate
See NS package Number
Order Number LM2412T
Top View
PP
for V
CC
= 80V
December 1999
DS101298-2
www.national.com

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LM2412T Summary of contents

Page 1

... PCB layout Applications n CRT driver for color monitors with display resolutions up to 1600 x 1200 with 85 Hz refresh rate n Pixel clock frequency up to 200 MHz PP DS101298-1 DS101298 December 1999 for V = 80V PP CC DS101298-2 Top View Order Number LM2412T See NS package Number www.national.com ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Bias Voltage Input Voltage Storage Temperature Range, T STG < Lead Temperature (Soldering, 10 sec.) Electrical Characteristics (See Figure 2 for Test Circuit) ...

Page 3

Typical Performance Characteristics FIGURE OUT FIGURE 4. Speed vs Temp. FIGURE 5. Rise/Fall Time DS101298-4 FIGURE 6. Power Dissipation vs Frequency DS101298-6 DS101298-8 3 DS101298-5 DS101298-7 FIGURE 7. Speed vs Offset DS101298-9 FIGURE 8. Bandwidth ...

Page 4

... AC coupled to the input of the CRT driver. Application Hints INTRODUCTION National Semiconductor (NSC) is committed to providing application information that assists our customers in obtain- ing the best performance possible from our products. The following information is provided in order to support this commitment. The reader should be aware that the optimiza- tion of performance was done using a specific printed circuit board designed at NSC ...

Page 5

... Ott, Henry W., “Noise Reduction Techniques in Electronic Systems”, John Wiley & Sons, New York, 1976. “Guide to CRT Video Design”, National Semiconductor Ap- plication Note 861. “Video Amplifier Design for Computer Monitors”, National Semiconductor Application Note 1013. ...

Page 6

Application Hints (Continued) good example of a layout that can be used as a guide for future layouts. Note the location of the following compo- nents: • C47 - V bypass capacitor, located very close to pin 6 CC and ...

Page 7

Application Hints (Continued) 7 www.national.com ...

Page 8

Application Hints (Continued) www.national.com FIGURE 11. PCB Top Layer 8 DS101298-13 ...

Page 9

Application Hints (Continued) FIGURE 12. PCB Bottom Layer 9 DS101298-14 www.national.com ...

Page 10

Application Hints (Continued) www.national.com FIGURE 13. PCB CRT Driver, Blue Channel Output DS101298-16 FIGURE 14. I and DS101298-15 IN ...

Page 11

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted 11 Lead Molded TO-220 NS Package Number TA11B Order Number LM2412T 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

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