lm2483 National Semiconductor Corporation, lm2483 Datasheet

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lm2483

Manufacturer Part Number
lm2483
Description
180v Triple Bias Clamp
Manufacturer
National Semiconductor Corporation
Datasheet

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Part Number:
lm2483NA
Manufacturer:
NS/国半
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20 000
© 2002 National Semiconductor Corporation
LM2483
180V Triple Bias Clamp
General Description
The LM2483 driver is an Integrated 180V 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 -30. The LM2483 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
Order Number LM2483NA
Top View
DS200529
20052933
n Matched to LM2426 HDTV Driver
Applications
n AC coupled HDTV applications using the 1080i and
720p formats as well as standard NTSC and PAL
formats.
FIGURE 1. Simplified Schematic Diagram (One
Channel)
November 2002
www.national.com
20052932

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lm2483 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 -30. The LM2483 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 LM2483 Clamp Amplifier. A high impedance Voltmeter ( DC measurements at the output. www.national.com (Notes 1, Human Body Model ...

Page 3

... LM2426. Thermal Considerations The package the LM2483 is in uses the ground pins ( 10, 11, and 12) to conduct heat from the LM2483. 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 LM2483 is shown in Figures 5 and Figure 6. Used in conjunction with an LM126X Preamp and an LM2426 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/LM2426/LM2483 ...

Page 5

... Demonstration Board Schematics FIGURE 5. LM126X/LM2426/LM2483 Demonstration Board Schematic 5 20052929 www.national.com ...

Page 6

... Demonstration Board Schematics FIGURE 6. LM126X/LM2426/LM2483 Demonstration Board Schematic www.national.com (Continued) 6 20052930 ...

Page 7

... Demonstration Board Schematics FIGURE 7. LM126X/LM2426/LM2483 Demonstration Board Layout (Continued) 7 20052931 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 LM2483NA NS Package Number N14A 2. A critical component is any component of a life ...

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