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Application Notes

• Download
  High Speed Amplifier Techniques &mdash AN47
  PDF, 5.3 Mb, File published: Aug 1, 1991
  This application note, subtitled "A Designer's Companion for Wideband Circuitry," is intended as a reference source for designing with fast amplifiers. Approximately 150 pages and 300 figures cover frequently encountered problems and their possible causes. Circuits include a wide range of amplifiers, filters, oscillators, data converters and signal conditioners. Eleven appended sections discuss related topics including oscilloscopes, probe selection, measurement and equipment considerations, and breadboarding techniques.
  Extract from the document

  Application Note 47
  August 1991
  High Speed Amplifier Techniques
  A Designer’s Companion for Wideband Circuitry
  Jim Williams PREFACE
  This publication represents the largest LTC commitment
  to an application note to date. No other application note
  absorbed as much effort, took so long or cost so much.
  This level of activity is justified by our belief that high speed
  monolithic amplifiers greatly interest users.
  Historically, monolithic amplifiers have represented packets of inexpensive, precise and controllable gain. They
  have partially freed engineers from the constraints and
  frustrations of device level design. Monolithic operational
  amplifiers have been the key to practical implementation
  of high level analog functions. As good as they are, one
  missing element in these devices has been speed.
  Devices presently coming to market are addressing monolithic amplifiers’ lack of speed. They bring with them the
  ease of use and inherent flexibility of op amps. When Philbrick Researches introduced the first mass produced
  op amp in the 1950’s (K2-W) they knew it would be used.
  What they couldn’t possibly know was just how widely,
  and how many different types of applications there were.
  As good a deal as the K2-W was (I paid $24.00 for mine or rather, my father did), monolithic devices are far better.
  The combination of ease of use, economy, precision and …

• Download
  Linear Technology Magazine Circuit Collection, Volume 1 &mdash AN52
  PDF, 190 Kb, File published: Jan 1, 1993
  This application note consolidates the circuits from the first few years of Linear Technology magazine into one publication. Presented in the note are a variety of circuits ranging from a 50W high efficiency (>90%) switching regulator to steep roll-off filter circuits with low distortion to 12-bit differential temperature measurement systems.
  Extract from the document

  Application Note 52
  January 1993
  Linear Technology Magazine Circuit Collection, Volume 1
  Richard Markell, Editor
  Introduction
  Over the past several years Linear Technology, the magazine, has come of age. From nothing, the publication has
  come into its own, as has its subscriber list. Many innovative circuits have seen the light of day in the pages of our
  now hallowed publication. This Application Note is meant to consolidate the circuits
  from the first few years of the magazine in one place.
  Circuits herein range from laser diode driver circuits to
  data acquisition systems to a 50W high efficiency switcher
  circuit. Enough said. I’ll stand aside and let the authors
  explain their circuits.
  L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
  Technology Corporation. All other trademarks are the property of their respective owners. CIRCUIT INDEX
  A-to-D Converters .2
  LTC1292: 12-BIT DATA ACQUISITION CIRCUITS .2
  Temperature-Measurement System .2
  Floating, 12-Bit Data Acquisition System .2
  Differential Temperature Measurement System .2
  MICROPOWER SO8 PACKAGED ADC CIRCUITS .4
  Floating 8-Bit Data Acquisition System .4
  0В°C – 70В°C Thermometer .5 …

• Download
  Video Circuit Collection &mdash AN57
  PDF, 559 Kb, File published: Jan 2, 1994
  AN57, the Video Circuit Collection, features a variety of video circuits designed at LTC. The LT1204 70MHz multiplexer is featured in a number of circuits which require excellent video isolation from channel to channel. High speed voltage and current feedback amplifiers are highlighted throughout the section on video processing circuits. There is a section on applying Current Feedback Amplifiers (CFAs) and a number of articles taken from the Linear Technology magazine.
  Extract from the document

  Application Note 57
  January 1994
  Video Circuit Collection
  Jon Munson and Frank Cox
  INTRODUCTION
  Even in a time of rapidly advancing digital image processing, analog video signal processing still remains eminently
  viable. The video A/D converters need a supply of properly
  amplified, limited, DC restored, clamped, clipped, contoured, multiplexed, faded and filtered analog video before
  they can accomplish anything. After the digital magic is
  performed, there is usually more amplifying and п¬Ѓltering
  to do as an adjunct to the D/A conversion process, not to mention all those pesky cables to drive. The analog way
  is often the most expedient and efficient, and you don’t
  have to write all that code.
  The foregoing is only partly in jest. The experienced engineer
  will use whatever method will properly get the job done;
  analog, digital or magic (more realistically, a combination
  of all three). Presented here is a collection of analog video
  circuits that have proven themselves useful. CIRCUIT INDEX
  I. Video Amplifier Selection Guide . 2 II. Video Cable Drivers . 3
  AC-Coupled Video Drivers . 3
  DC-Coupled Video Drivers . 4
  Clamped AC-Input Video Cable Driver . 5
  Twisted-Pair Video Driver and Receiver . 5 III. Video Processing Circuits . 6 …

• Download
  Linear Technology Magazine Circuit Collection, Volume III &mdash AN67
  PDF, 1.2 Mb, File published: Sep 1, 1996
  Application Note 67 is a collection of circuits for data conversion, interface and signal processing from the first five years of Linear Technology. This application note includes circuits such as fast video multiplexers for high speed video, an ultraselective bandpass filter circuit with adjustable gain, and a fully differential, 8-channel, 12-bit A/D system. The categories included in this app note are data conversion, interface, filters, instrumentation, video/op amps and miscellaneous circuits.
  Extract from the document

  Application Note 67
  September 1996
  Linear Technology Magazine Circuit Collection, Volume III
  Data Conversion, Interface and Signal Processing
  Richard Markell, Editor
  INTRODUCTION
  Application Note 67 is a collection of circuits from the first
  five years of Linear Technology, targeting data conversion,
  interface and signal processing applications. This
  Application Note includes circuits such as fast video
  multiplexers for high speed video, an ultraselective
  bandpass filter circuit with adjustable gain and a fully differential, 8-channel, 12-bit A/D system. The categories
  included herein are data conversion, interface, filters,
  instrumentation, video/op amps and miscellaneous
  circuits. Application Note 66, which covers power products
  and circuits from Linear Technology ’s first five years, is
  also available from LTC. ARTICLE INDEX
  Data Conversion . 3
  Fully Differential, 8-Channel, 12-Bit A/D System Using the LTCВ®1390 and LTC1410 . 3
  12-Bit DAC Applications . 5
  LTC1329 Micropower, 8-Bit, Current Output DAC Used for Power Supply Adjustment,
  Trimmer Pot Replacement . 7
  12-Bit Cold Junction Compensated, Temperature Control System with Shutdown . 8 …

• Download
  Signal Sources, Conditioners and Power Circuitry Circuits of the Fall, 2004 &mdash AN98
  PDF, 886 Kb, File published: Nov 19, 2004
  Eighteen circuits are presented in this compilation. Signal sources include a voltage controlled current source, an amplitude/frequency stabilized sine wave oscillator, a versatile, 0V to 50V wideband level shift and four sub-nanosecond pulse generators with risetimes as low as 20ps. Five signal conditioners appear; a unique, single positive rail powered amplifier with output to (and below) zero volts, a milliohmmeter, a 0.02% accurate instrumentation amplifier with 120dB CMRR at 125VCM, a 100MHz switch with 5mV control channel feedthrough and a 5V powered, 15ppm linearity quartz stabilized V→F, converter. The power circuits section features a Xenon flashlamp supply, two 5V powered, 0V to 300V DC/DC converters, a fixed 200V output circuit for APD bias, a 100W 0V to 500V, 28V powered converter and a high current paralleling scheme for linear regulators. Two appended sections consider measurement technique and connection practice in sub-nanosecond circuits.
  Extract from the document

  Application Note 98
  November 2004
  Signal Sources, Conditioners and Power Circuitry
  Circuits of the Fall, 2004
  Jim Williams
  Introduction
  Occasionally, we are tasked with designing circuitry for a
  specific purpose. The request may have customer origins
  or it may be an in-house requirement. Alternately, a circuit
  may be developed because its possibility is simply too
  attractive to ignore1. Over time, these circuits accumulate,
  encompassing a wide and useful body of proven capabilities. They also represent substantial effort. These considerations make publication an almost obligatory proposition
  and, as such, a group of circuits is presented here. This is
  not the first time we have displayed such wares and, given
  the encouraging reader response, it will not be the last2.
  Eighteen circuits are included in this latest effort, roughly
  arranged in the categories given in this publication’s title.
  They appear at the next paragraph.
  Voltage Controlled Current Source—Ground Referred
  Input and Output
  A voltage controlled current source with ground referred
  input and output is difficult to achieve. Executions exist,
  but are often cumbersome, involving numerous components. Figure 1’s conceptual design utilizes a differential …

Design Notes

• Download
  Video Circuits Collection &mdash DN57
  PDF, 79 Kb, File published: Apr 1, 1992
  Extract from the document

  Video Circuits Collection – Design Note 57
  William H. Gross
  Introduction
  This note shows how to make several different video
  circuits using high speed op amps. All of these circuits
  work with composite, RGB and monochrome video.
  For best results, bypass the power supply pins of
  these amplifiers with 1μF to 10μF tantalum capacitors
  in parallel with 0.01ОјF disc capacitors. It is important
  to terminate both ends of video cables to preserve
  frequency response. When properly terminated, the
  cable looks like a resistive load of 150О©.
  Lots of Inputs Video MUX Cable Driver (LT1227) Multiplex Amplifiers
  Often it is desirable to select one of several signals to
  send down a cable. Connecting the outputs of several
  amplifiers together and using the amplifier’s shutdown
  pin to disable all but one accomplishes this goal. The
  LTВ®1190, LT1191, LT1192, and LT1193 are shutdown by
  pulling pin 5 to the negative supply.
  The LT1223 and LT1227 current feedback amplifiers are
  shutdown by pulling Pin 8 to ground. During normal
  operation Pin 8 is open and at the positive supply potential. An easy way to interface Pin 8 to logic is with
  a logic level N-channel FET or a 74C906 (open-drain …

• Download
  A Broadband Random Noise Generator &mdash DN70
  PDF, 95 Kb, File published: May 1, 1993
  Extract from the document

  A Broadband Random Noise Generator – Design Note 70
  Jim Williams
  Filter, audio and RF communication testing often requires a random noise source. The circuit in Figure 1
  provides an RMS amplitude regulated noise source with
  selectable bandwidth. The RMS output is 300mV with
  a 1kHz to 5MHz bandwidth selected in decade ranges. output feeds LT1228 A4, a current feedback amplifier.
  A4’s output, the circuit’s output, is sampled by the A5
  based gain control configuration. This closes a gain
  control loop back at A3. A3’s ISET input current controls
  its gain, allowing overall output level control. The A1 amplifier, biased from the LT®1004 reference,
  provides optimum drive for D1, the noise source. AC
  coupled A2 takes a broadband gain of 100. The A2
  output feeds a gain control stage via a simple selectable
  lowpass filter. The filter’s output is applied to LT1228
  A3, an operational transconductance amplifier. A3’s To adjust this circuit, place the filter in the 1kHz position
  and trim the 5k potentiometer for maximum negative
  bias at A3, Pin 5.
  L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
  of Linear Technology Corporation. All other trademarks are the property of their
  respective owners. 1M
  0.1ОјF
  15V
  100k 2 3 – 1kHz 8 0.01ОјF …

Model Line

Manufacturer's Classification

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > High Speed Amplifiers (GBW > 50MHz) | Current Feedback Amplifiers | High Voltage Amplifiers (>12V)
• Signal Conditioning > Amplifiers > Video Functions

Other Names:

LT1228CN8PBF, LT1228CN8 PBF