Datasheet Linear Technology LT1005 — Даташит

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Application Notes

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  Circuit Techniques for Clock Sources &mdash AN12
  PDF, 150 Кб, Файл опубликован: 1 окт 1985
  Circuits for clock sources are presented. Special attention is given to crystal-based designs including TXCOs and VXCOs.
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  Application Note 12
  October 1985
  Circuit Techniques for Clock Sources
  Jim Williams
  Almost all digital or communication systems require some
  form of clock source. Generating accurate and stable clock
  signals is often a difficult design problem.
  Quartz crystals are the basis for most clock sources. The
  combination of high Q, stability vs time and temperature,
  and wide available frequency range make crystals a
  price-performance bargain. Unfortunately, relatively little
  information has appeared on circuitry for crystals and
  engineers often view crystal circuitry as a black art, best
  left to a few skilled practitioners (see box, “About Quartz
  Crystals”).
  In fact, the highest performance crystal clock circuitry does
  demand a variety of complex considerations and subtle
  implementation techniques. Most applications, however,
  don’t require this level of attention and are relatively easy
  to serve. Figure 1 shows five (5) forms of simple crystal
  clocks. Types 1a through 1d are commonly referred to
  as gate oscillators. Although these types are popular,
  they are often associated with temperamental operation, …

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  Performance Enhancement Techniques for Three-Terminal Regulators &mdash AN2
  PDF, 975 Кб, Файл опубликован: 2 авг 1984
  This application note describes a number of enhancement circuit techniques used with existing 3-terminal regulators which extend current capability, limit power dissipation, provide high voltage output, operate from 110VAC or 220VAC without the need to switch transformer windings, and many other usefu application ideas.
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  Application Note 2
  August 1984
  Performance Enhancement Techniques for
  Three-Terminal Regulators
  Jim Williams
  Three terminal regulators provide a simple, effective solution to voltage regulation requirements. In many situations
  the regulator can be used with no special considerations.
  Some applications, however, require special techniques
  to enhance the performance of the device.
  Probably the most common modification involves extending the output current of regulators. Conceptually, the
  simplest way to do this is by paralleling devices. In practice,
  the voltage output tolerance of the regulators can cause
  problems. Figure 1 shows a way to use two regulators to
  achieve an output current equal to their sum. This circuit
  capitalizes on the 1% output tolerance of the specified
  regulators to achieve a simple paralleled configuration.
  Both regulators sense from the same divider string and
  the small value resistors provide ballast to account for the
  slightly differing output voltages. This added impedance
  degrades total circuit regulation to about 1%. Figure 2 shows another way to extend current capability
  in a regulator. Although this circuit is more complex than
  Figure 1, it eliminates the ballasting resistor’s effects
  and has a fast-acting logic-controlled shutdown feature. …

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  Micropower Circuits for Signal Conditioning &mdash AN23
  PDF, 2.2 Мб, Файл опубликован: 1 апр 1987
  Low power operation of electronic apparatus has become increasingly desirable. AN23 describes a variety of low power circuits for transducer signal conditioning. Also included are designs for data converters and switching regulators. Three appended sections discuss guidelines for micropower design, strobed power operation and effects of test equipment on micropower circuits.
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  Application Note 23
  April 1987
  Micropower Circuits for Signal Conditioning
  Jim Williams
  Low power operation of electronic apparatus has become
  increasingly desirable. Medical, remote data acquisition,
  power monitoring and other applications are good candidates for battery driven, low power operation. Micropower
  analog circuits for transducer-based signal conditioning
  present a special class of problems. Although micropower
  ICs are available, the interconnection of these devices to
  form a functioning micropower circuit requires care. (See
  Box Sections, “Some Guidelines for Micropower Design
  and an Example” and “Parasitic Effects of Test Equipment
  on Micropower Circuits.”) In particular, trade-offs between
  signal levels and power dissipation become painful when
  performance in the 10-bit to 12-bit area is desirable. Additionally, many transducers and analog signals produce +V inherently small outputs, making micropower requirements complicate an already difficult situation. Despite the
  problems, design of such circuits is possible by combining
  high performance micropower ICs with appropriate circuit
  techniques.
  Platinum RTD Signal Conditioner
  Figure 1 shows a simple circuit for signal conditioning
  a platinum RTD. Correction for the platinum sensor’s
  nonlinear response is included. Accuracy is 0.25В°C over …

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  Understanding and Applying the LT1005 Multifunction Regulator &mdash AN1
  PDF, 307 Кб, Файл опубликован: 1 авг 1984
  This application note describes the unique operating characteristics of the LT1005 and describes a number of useful applications which take advantage of the regulator's ability to control the output with a logic control signal.
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  Application Note 1
  August 1984
  Understanding and Applying the LT1005
  Multifunction Regulator
  Jim Williams
  The number of voltage regulators currently available
  makes the introduction of another regulator seem almost
  unnecessary. However, a new device, the LTВ®1005, offers
  auxiliary functions which help solve problems often associated with voltage regulation in circuits.
  The LT1005 (Figure 1) consists of a 5V, 1A1 regulator,
  which is controlled by a positive logic enable pin, and a 5V
  auxiliary regulator. The auxiliary regulator’s output is unaffected by the state of the main regulator. Thermal overload protection and current limiting round out the device. The
  enable pin is a high impedance input which floats in a high
  state. 10ОјA1 of current pulled from the pin will force it
  below its 1.6V turn-off threshold, shutting down the main
  output. Figure 2a shows a simple but useful application.
  Here, the regulator’s enable pin is controlled by the state
  of a toggling flip-flop which is triggered by a pushbutton
  on a computer keyboard. The auxiliary 5V output powers
  Note 1: A 3A version to the LT1005 is also available. See LT1035
  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. LT1005
  INPUT 20V MAX …

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