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Application Notes

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  Designing Linear Circuits for 5V Single Supply Operation &mdash AN11
  PDF, 230 Кб, Файл опубликован: 1 сен 1985
  This note covers the considerations for designing precision linear circuits which must operate from a single 5V supply. Applications include various transducer signal conditioners, instrumentation amplifiers, controllers and isolated data converters.
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  Application Note 11
  September 1985
  Designing Linear Circuits for 5V Single Supply Operation
  Jim Williams
  In predominantly digital systems it is often necessary
  to include linear circuit functions. Traditionally, separate
  power supplies have been used to run the linear components (see Box, “Linear Power Supplies—Past, Present,
  and Future”).
  Recently, there has been increasing interest in powering
  linear circuits directly from the 5V logic rail. The logic
  rail is a difficult place for analog components to function.
  The high amplitude broadband current and voltage noise
  generated by logic clocking makes analog circuit operation difficult. (See Box, “Using Logic Supplies for Linear
  Functions”.)
  Generally speaking, analog circuitry which must achieve
  very high performance levels should be driven from dedicated supplies. The difficulties encountered in maintaining
  the lowest possible levels of noise and drift in an analog
  system are challenging enough without contending with
  a digitally corrupted power supply.
  Many analog applications, however, can be successfully
  implemented using the logic supply. Combining components intended to provide high performance from the 167Ω Q1 –
  + 2M 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. RATIOMETRIC …

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  Designs for High Performance Voltage-to-Frequency Converters &mdash AN14
  PDF, 387 Кб, Файл опубликован: 1 мар 1986
  A variety of high performance V/F circuits is presented. Included are a 1Hz to 100MHz design, a quartz-stabilized type and a 0.0007% linear unit. Other circuits feature 1.5V operation, sine wave output an nonlinear transfer functions. A separate section examines the trade-offs and advantages of various approaches to V/F conversion.
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  Application Note 14
  March 1986
  Designs for High Performance Voltage-to-Frequency
  Converters
  Jim Williams
  Monolithic, modular and hybrid technologies have been
  used to implement voltage-to-frequency converters. A
  number of types are commercially available and overall
  performance is adequate to meet many requirements. In
  many cases, however, very high performance or special
  characteristics are required and available units will not work.
  In these instances V→F circuits specifically optimized for
  the desired parameters(s) are required. This application
  note presents examples of circuits which offer substantially improved performance over commercially available
  V→Fs. Various approaches (see Box Section, “V→F
  Design Techniques”) permit improvements in speed, dynamic range, stability and linearity. Other circuits feature
  low voltage operation, sine wave output and deliberate
  nonlinear transfer functions.
  Ultra-High Speed 1Hz to 100MHz V→F Converter
  Figure 1’s circuit uses a variety of circuit methods to
  achieve wider dynamic range and higher speed than any
  commercial V→F. Rocketing along at 100MHz full-scale
  (10% overrange to 110MHz is provided), it leaves all other …

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  Unique IC Buffer Enhances Op Amp Designs, Tames Fast Amplifiers &mdash AN16
  PDF, 421 Кб, Файл опубликован: 1 авг 1985
  This note describes some of the unique IC design techniques incorporated into a fast, monolithic power buffer, the LT1010. Also, some application ideas are described such as capacitive load driving, boosting fast op amp output current and power supply circuits.
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  Application Note 16
  August 1985
  Unique IC Buffer Enhances Op Amp Designs,
  Tames Fast Amplifiers
  Robert J. Widlar
  Abstract: A unity gain IC power buffer that uses NPN
  output transistors while avoiding the usual problems of
  quasi-complementary designs is described. Free of parasitic oscillations and stable with large capacitive loads, the
  buffer has a 20MHz bandwidth, a 100V/Ојs slew and can
  drive В±10V into a 75О© load. Standby current is 5mA. A
  number of applications using the buffer are detailed, and
  it is shown that a buffer has many uses beyond driving
  a heavy load.
  Introduction
  An output buffer can do much more than increase the
  output swing of an op amp. It can also eliminate ringing
  with large capacitive loads. Fast buffers can improve the
  performance of high speed followers, integrators and
  sample/hold circuits, while at the same time making them
  much easier to work with.
  Interest in buffers has been low because a reasonably
  priced, high performance, general purpose part has not
  been available. Ideally, a buffer should be fast, have no …

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  Composite Amplifiers &mdash AN21
  PDF, 330 Кб, Файл опубликован: 1 июл 1986
  Applications often require an amplifier that has extremely high performance in several areas. For example, high speed and DC precision are often needed. If a single device cannot simultaneously achieve the desired characteristics, a composite amplifier made up of two (or more) devices can be configured to do the job. AN21 shows examples of composite approaches in designs combining speed, precision, low noise and high power.
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  Application Note 21
  July 1986
  Composite Amplifiers
  Jim Williams
  Amplifier design, regardless of the technology utilized, is
  a study in compromise. Device limitations make it difficult
  for a particular amplifier to achieve optimal speed, drift,
  bias current, noise and power output specifications. As
  such, various amplifier families emphasizing one or more
  of these areas have evolved. Some amplifiers are very good
  attempts at doing everything well, but the best achievable
  performance п¬Ѓgures are limited to dedicated designs. designed with little attention to DC biasing considerations
  if a separate stabilizing stage is employed.
  Figure 1 shows a composite made up of an LTВ®1012 low drift
  device and an LT1022 high speed amplifier. The overall circuit is a unity-gain inverter, with the summing node located
  at the junction of three 10k resistors. The LT1012 monitors
  this summing node, compares it to ground and drives the
  LT1022’s positive input, completing a DC stabilizing loop
  around the LT1022. The 10k-300pF time constant at the
  LT1012 limits its response to low frequency signals. The
  LT1022 handles high frequency inputs while the LT1012
  stabilizes the DC operating point. The 4.7k-220О© divider
  at the LT1022 prevents excessive input overdrive during …

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  Thermocouple Measurement &mdash AN28
  PDF, 988 Кб, Файл опубликован: 1 фев 1988
  Considerations for thermocouple-based temperature measurement are discussed. A tutorial on temperature sensors summarizes performance of various types, establishing a perspective on thermocouples. Thermocouples are then focused on. Included are sections covering cold-junction compensation, amplifier selection, differential/isolation techniques, protection, and linearization. Complete schematics are given for all circuits. Processor- based linearization is also presented with the necessary software detailed.
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  Application Note 28
  February 1988
  Thermocouple Measurement
  Jim Williams
  Introduction Thermocouples in Perspective In 1822, Thomas Seebeck, an Estonian physician, accidentally joined semicircular pieces of bismuth and copper
  (Figure 1) while studying thermal effects on galvanic arrangements. A nearby compass indicated a magnetic disturbance. Seebeck experimented repeatedly with different
  metal combinations at various temperatures, noting relative
  magnetic п¬Ѓeld strengths. Curiously, he did not believe that
  electric current was flowing, and preferred to describe the
  effect as “thermo-magnetism.” He published his results in
  a paper, “Magnetische Polarisation der Metalle und Erze
  durch Temperatur-Differenz” (see references). Temperature is easily the most commonly measured
  physical parameter. A number of transducers serve temperature measuring needs and each has advantages and
  considerations. Before discussing thermocouple-based
  measurement it is worthwhile putting these sensors in
  perspective. Figure 2’s chart shows some common contact
  temperature sensors and lists characteristics. Study reveals
  thermocouple strengths and weaknesses compared to
  other sensors. In general, thermocouples are inexpensive,
  wide range sensors. Their small size makes them fast and
  their low output impedance is a benefit. The inherent voltage output eliminates the need for excitation. Subsequent investigation has shown the “Seebeck Effect”
  to be fundamentally electrical in nature, repeatable, and
  quite useful. Thermocouples, by far the most common …

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  Applications for a Switched-Capacitor Instrumentation Building Block &mdash AN3
  PDF, 1.5 Мб, Файл опубликован: 1 июл 1985
  This application note describes a wide range of useful applications for the LTC1043 dual precision instrumentation switched capacitor building block. Some of the applications described are ultra high performance instrumentation amplifier, lock-in amplifier, wide range digitally controlled variable gain amplifier, relative humidity sensor signal conditioner, LVDT signal conditioner, charge pump F/V and V/F converters, 12-bit A/D converter and more.
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  Application Note 3
  July 1985
  Applications for a Switched-Capacitor Instrumentation
  Building Block
  Jim Williams
  CMOS analog IC design is largely based on manipulation
  of charge. Switches and capacitors are the elements used
  to control and distribute the charge. Monolithic п¬Ѓlters, data
  converters and voltage converters rely on the excellent
  characteristics of IC CMOS switches. Because of the importance of switches in their circuits, CMOS designers have
  developed techniques to minimize switch induced errors,
  particularly those associated with stray capacitance and
  switch timing. Until now, these techniques have been used
  only in the internal construction of monolithic devices. A
  new device, the LTCВ®1043, makes these switches available
  for board-level use. Multi-pole switching and a self-driven,
  non-overlapping clock allow the device to be used in circuits
  which are impractical with other switches. Conceptually, the LTC1043 is simple. Figure 1 details its
  features. The oscillator, free-running at 200kHz, drives a
  non-overlapping clock. Placing a capacitor from Pin 16 to
  ground shifts the oscillator frequency downward to any
  desired point. The pin may also be driven from an external
  source, synchronizing the switches to external circuitry. …

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  Voltage Reference Circuit Collection &mdash AN42
  PDF, 1.7 Мб, Файл опубликован: 1 июн 1991
  A wide variety of voltage reference circuits are detailed in this extensive guidebook of circuits. The detailed schematics cover simple and precision approaches at a variety of power levels. Included are 2 and 3 terminal devices in series and shunt modes for positive and negative polarities. Appended sections cover resistor and capacitor selection and trimming techniques.
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  Some Techniques for Direct Digitization of Transducer Outputs &mdash AN7
  PDF, 297 Кб, Файл опубликован: 1 фев 1985
  Analog-to-digital conversion circuits which directly digitize low level transducer outputs, without DC preamplification, are presented. Covered are circuits which operate with thermocouples, strain gauges, humidity sensors, level transducers and other sensors.
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  Application Note 7
  February 1985
  Some Techniques for Direct Digitization of Transducer Outputs
  Jim Williams
  Almost all transducers produce low level signals. Normally,
  high accuracy signal conditioning amplifiers are used to
  boost these outputs to levels which can easily drive cables,
  additional circuitry, or data converters. This practice raises
  the signal processing range well above the error floor,
  permitting high resolution over a wide dynamic range.
  Some emerging trends in transducer-based systems are
  causing the use of signal conditioning amplifiers to be
  reevaluated. While these amplifiers will always be useful,
  their utilization may not be as universal as it once was.
  In particular, many industrial transducer-fed systems are
  employing digital transmission of signals to eliminate
  noise-induced inaccuracies in long cable runs. Additionally, the increasing digital content of systems, along with
  pressures on board space and cost, make it desirable to
  digitize transducer outputs as far forward in the signal chain
  as possible. These trends point toward direct digitization
  of transducer outputs—a difficult task.
  Classical A/D conversion techniques emphasize high level
  input ranges. This allows LSB step size to be as large …

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  Application Considerations and Circuits for a New Chopper-Stabilized Op Amp &mdash AN9
  PDF, 625 Кб, Файл опубликован: 5 авг 1986
  A discussion of circuit, layout and construction considerations for low level DC circuits includes error analysis of solder, wire and connector junctions. Applications include sub-microvolt instrumentation and isolation amplifiers, stabilized buffers and comparators and precision data converters.
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  Application Note 9
  August 1986
  Application Considerations and Circuits for a New
  Chopper-Stabilized Op Amp
  Jim Williams
  A great deal of progress has been made in op amp DC
  characteristics. Carefully executed designs currently available provide sub-microvolt VOS О”T drift, low bias currents
  and open-loop gains exceeding one million. Considerable
  design and processing advances were required to achieve
  these specifications. Because of this, it is interesting to
  note that amplifiers with even better DC specification
  were available in 1963 (Philbrick Researches Model
  SP656). Although these modular amplifiers were large
  and expensive (≈3" × 2" × 1.5" at $195.00 1963 dollars)
  by modern standards, their DC performance anticipated
  today’s best monolithic amplifiers while using relatively
  primitive components. This was accomplished by employing chopper-stabilization techniques (see Box “Choppers,
  Chopper-Stabilization and the LTC®1052”) instead of the
  more common DC-differential stage approach.
  The chopper-stabilized approach, developed by E. A.
  Goldberg in 1948, uses the amplifier’s input to amplitude
  modulate an AC carrier. This carrier, amplified and synchronously demodulated back to DC, furnishes the amplifier’s PARAMETER
  EOS – 25В°C …

Design Notes

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  Chopper vs Bipolar Op Amps—An Unbiased Comparison &mdash DN42
  PDF, 70 Кб, Файл опубликован: 1 дек 1990
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  Chopper vs Bipolar Op Amps—An Unbiased Comparison
  Design Note 42
  George Erdi Table 1 lists the parameters of importance. In all input
  parameters (except noise) the advantage unquestionably goes to the choppers. 5ОјV maximum offset voltage, 0.5ОјV/В°C maximum drift are commonly found
  Table 1. Chopper Stabilized vs Precision Bipolar Op Amps
  ADVANTAGE
  PARAMETER
  Offset Voltage
  Offset Drift
  All Other DC Specs CHOPPER BIPOLAR COMMENTS
  вњ“
  вњ“
  вњ“ No Contest Wideband, 20Hz to
  1MHz вњ“ See Details in Text Noise вњ“ See Details in Text вњ“ Rail to Rail Swing
  2mA Limit on
  Choppers Output: Light Load
  Heavy Load
  Single Supply
  Application вњ“ вњ“ Inherent to
  Choppers Needs
  Special Design
  Bipolars В±15V Supply Voltage вњ“ Except LTC1150 Prejudice/Tradition вњ“ Still a Chopper
  Problem Cost 08/90/86_conv вњ“ Unless DC …

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Классификация производителя

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Precision Amplifiers (Vos | Zero-Drift Amplifiers | Low Bias Current Amplifiers (Ib < 100pA) | High Voltage Amplifiers (>12V) | Rail-to-Rail Amplifiers

Варианты написания:

LTC1052CSWTRPBF, LTC1052CSW TRPBF