LM2445 NSC | Alldatasheet

Document overview

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Technical content

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 peaking networks n Convenient TO-220 staggered lead package style n Maintains standard LM243X Family pinout which is designed for easy PCB layout

Applications

n 1024 x 768 displays up to 85 Hz refresh n Pixel clock frequencies up to 95 MHz n Monitors using video blanking Schematic Diagram 20063701 FIGURE 1. Simplified Schematic Diagram

Note: Tab is at GND Top View Order Number LM2445TA LM2445 www.national.com 2

Absolute Maximum Ratings(Notes 1, If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V CC) +90V Bias Voltage (VBB) +16V Input Voltage (VIN) 0V to 4.5V Storage Temperature Range (TSTG) −65˚C to +150˚C Lead Temperature (Soldering, <10 sec.) 300˚C ESD Tolerance, Human Body Model 2k V Machine Model 250V Operating Ranges(Note 2) VCC +60V to +85V VBB +8V to +15V VIN +0V to +3.75V VOUT +15V to +75V Case Temperature −20˚C to +100˚C Do not operate the part without a heat sink.

Electrical Characteristics

(See Figure 2for Test Circuit) Unless otherwise noted: V CC = +80V, VBB = +12V, CL = 8 pF, T C = 50˚C DC Tests: VIN = 2.25VDC AC Tests: Output = 40V PP(25V - 65V) at 1MHz Symbol Parameter Conditions LM2445 UnitsMin Typical Max ICC Supply Current All Three Channels, No Input Signal, No Output Load 30 mA IBB Bias Current All Three Channels 18 mA VOUT DC Output Voltage No AC Input Signal, V IN = 1.25V 62 65 68 V DC AV DC Voltage Gain No AC Input Signal −18 −20 −22 ∆AV Gain Matching (Note 4), No AC Input Signal 1.0 dB LE Linearity Error (Notes 4, 5), No AC Input Signal 5 % t R Rise Time (Note 6), 10% to 90% 7.5 ns tF Fall Time (Note 6), 90% to 10% 8 ns OS Overshoot (Note 6) 1 % Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Note 2: Operating ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance ch aracteristics may change when the device is not operated under the listed test conditions. Note 3: All voltages are measured with respect to GND, unless otherwise specified. Note 4: Calculated value from Voltage Gain test on each channel. Note 5: Linearity Error is the variation in dc gain from V IN = 1.0V to V IN = 3.5V. Note 6: Input from signal generator: t r,t f < 1 ns. LM2445 www.national.com3

FIGURE 11. LM126X/LM246X Demonstration Board Schematic

FIGURE 12. LM126X/LM246X Demonstration Board Schematic (continued)

FIGURE 13. LM126X/LM246X Demo Board Layout

FIGURE 14. Trace Routing and Component Placement for Blue Channel Output

Physical Dimensions inches (millimeters) unless otherwise noted CONTROLLING DIMENSION IS INCH VALUES IN [ ] ARE MILLIMETERS Order Number LM2445TA LM2445 www.national.com13

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 into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 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, or to affect its safety or effectiveness. National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Fax: +65-6250 4466 Email: ap.support@nsc.com Tel: +65-6254 4466 National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 www.national.com LM2445 Monolithic Triple 7.5 ns CRT Driver National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the righ t at any time without notice to change said circuitry and specifications.