lm6121 National Semiconductor Corporation, lm6121 Datasheet

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lm6121

Manufacturer Part Number
lm6121
Description
High Speed Buffer
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2004 National Semiconductor Corporation
LM6121/LM6221/LM6321
High Speed Buffer
General Description
These high speed unity gain buffers slew at 800 V/µs and
have a small signal bandwidth of 50 MHz while driving a 50Ω
load. They can drive
while driving large capacitive loads. The LM6121 family are
monolithic ICs which offer performance similar to the
LH0002 with the additional features of current limit and
thermal shutdown.
These buffers are built with National’s VIP
grated PNP) process which provides fast PNP transistors
that are true complements to the already fast NPN devices.
This advanced junction-isolated process delivers high speed
performance without the need for complex and expensive
dielectric isolation.
Simplified Schematic
Numbers in ( ) are for 8-pin N DIP.
VIP
is a trademark of National Semiconductor Corporation.
±
300 mA peak and do not oscillate
DS009223
(Vertically Inte-
Features
n High slew rate:
n Wide bandwidth: 50 MHz
n Slew rate and bandwidth 100% tested
n Peak output current:
n High input impedance: 5 MΩ
n LH0002H pin compatible
n No oscillations with capacitive loads
n 5V to
n Current and thermal limiting
n Fully specified to drive 50Ω lines
Applications
n Line Driving
n Radar
n Sonar
±
15V operation guaranteed
00922301
800 V/µs
±
300 mA
www.national.com
March 2004

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lm6121 Summary of contents

Page 1

... MHz while driving a 50Ω ± load. They can drive 300 mA peak and do not oscillate while driving large capacitive loads. The LM6121 family are monolithic ICs which offer performance similar to the LH0002 with the additional features of current limit and thermal shutdown. ...

Page 2

... See Application section on heat-sinking requirements. − These pins are at V potential. www.national.com Plastic DIP 00922302 Order Number LM6221N, LM6321N or LM6121J/883 See NS Package Number J08A or N08E Metal Can 00922303 Top View Order Number LM6221H or LM6121H/883 See NS Package ...

Page 3

... 50Ω unless otherwise noted. S LM6121 LM6221 LM6321 Limit Limit Limit (Notes 5, 9) (Note 5) (Note 5) 0.980 0.980 0.970 0.970 0.950 0.950 0.860 0.860 ...

Page 4

... Note 2: During current limit or thermal limit, the input current will increase if the input to output differential voltage exceeds 8V. For input to output differential voltages in excess of 8V the input current should be limited to Note 3: The LM6121 series buffers contain current limit and thermal shutdown to protect against fault conditions. Note 4: The thermal resistance θ ...

Page 5

Typical Performance Characteristics T = 25˚C, unless otherwise specified J Frequency Response Slew Rate vs Temperature Large Signal Response kΩ L Frequency Response 00922311 Overshoot vs Capacitive Load 00922313 Large Signal Response 00922315 5 00922312 00922314 R ...

Page 6

Typical Performance Characteristics Supply Current Slew Rate Power Bandwidth www.national.com T = 25˚C, unless otherwise specified (Continued) J 00922317 00922319 Input Return Gain (S11) 00922321 6 −3 dB Bandwidth 00922318 Slew Rate 00922320 00922322 ...

Page 7

... A ground plane is recommended. LOAD IMPEDANCE The LM6121 is stable to any load when driven by a 50Ω source. As shown in the Overshoot vs Capacitive Load graph, worst case is a purely capacitive load of about 1000 pF. Shunting the load capacitance with a resistor will reduce overshoot ...

Page 8

Application Hints (Continued) pation in any application simple case of a buffer driving a resistive load as in Figure 2 , the maximum DC power dissipation occurs when the output is at half the supply. ...

Page 9

... Physical Dimensions inches (millimeters) unless otherwise noted Metal Can Package (H) Order Number LM6221H or LM6121H/883 NS Package Number H08C 8-Pin Ceramic Dual-In-Line Package (J) Order Number LM6121J/883 NS Package Number J08A 9 www.national.com ...

Page 10

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) 14-Pin Small Outline Package (M) Order Number LM6321M NS Package Number M14A Molded Dual-In-Line Package (N) Order Number LM6221N or LM6321N NS Package Number N08E 10 ...

Page 11

... 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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