lm2481 National Semiconductor Corporation, lm2481 Datasheet

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lm2481

Manufacturer Part Number
lm2481
Description
145v Triple Bias Clamp
Manufacturer
National Semiconductor Corporation
Datasheet
© 2002 National Semiconductor Corporation
LM2481
145V Triple Bias Clamp
General Description
The LM2481 driver is an Integrated 145V triple bias clamp
circuit for DC recovery of each of the AC coupled outputs of
a HDTV CRT driver. It is well matched with the DAC outputs
of the LM126X family of pre-amplifiers. Each amplifier has its
gain internally set to -20. The LM2481 is packaged in an
industry standard 14 lead molded plastic dual-in-line pack-
age.
Features
n Wide range integrated triple bias clamp
n High input impedance
Schematic and Connection Diagrams
FIGURE 1. Simplified Schematic Diagram (One Channel)
DS200398
Order Number LM2481NA
Top View
n Matched to LM2421 HDTV Driver
Applications
n AC coupled HDTV applications using the 1080i and
720p formats
20039833
20039832
www.national.com
June 2002

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lm2481 Summary of contents

Page 1

... DC recovery of each of the AC coupled outputs of a HDTV CRT driver well matched with the DAC outputs of the LM126X family of pre-amplifiers. Each amplifier has its gain internally set to -20. The LM2481 is packaged in an industry standard 14 lead molded plastic dual-in-line pack- age. ...

Page 2

... Note 4: Linearity Error is the variation in dc gain from V 2 Note 5: Measured with 1in copper on PCB connected to pins 10, 11, 12. See Thermal Considerations Section. Test Circuit Figure 2 shows the test circuit for evaluation of the LM2481 Clamp Amplifier. A high impedance Voltmeter ( DC measurements at the output. www.national.com (Notes 1, Machine Model ...

Page 3

... LM2421. Thermal Considerations The package the LM2481 is in uses the ground pins ( 10, 11, and 12) to conduct heat from the LM2481. These pins should be connected to a ground plane that acts as a heat sink. See the example ground plane connected to these pins in the National Semiconductor PCB shown in Figure 7. > ...

Page 4

... Typical Application A typical application of the LM2481 is shown in Figures 5 and Figure 6. Used in conjunction with an LM126X Preamp and an LM2421 CRT Driver, a complete video channel from input to CRT cathode can be achieved. Performance is ideal for HDTV applications. Figure 5 and Figure 6 are the schematic for the NSC demonstration board that can be used to evalu- ate the LM126X/LM2421/LM2481 ...

Page 5

... Demonstration Board Schematics FIGURE 5. LM126X/LM2421/LM2481 Demonstration Board Schematic 5 20039829 www.national.com ...

Page 6

... Demonstration Board Schematics FIGURE 6. LM126X/LM2421/LM2481 Demonstration Board Schematic www.national.com (Continued) 6 20039830 ...

Page 7

... Demonstration Board Schematics FIGURE 7. LM126X/LM2421/LM2481 Demonstration Board Layout (Continued) 7 20039831 www.national.com ...

Page 8

... 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) Molded Dual-In-Line Package Order Number LM2481NA NS Package Number N14A 2. A critical component is any component of a life ...

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