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Application Notes

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  Interfacing the LTC1290 &mdash AN36 (A,B,C,D,E,F,O)
  PDF, 5.2 Мб, Файл опубликован: 23 сен 1989
  A collection of interface applications between various microprocessors/ controllers and the LTC1290 family of data acquisition systems. The note is divided into sections specific to each interface.
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  Data Acquisition Circuit Collection &mdash AN62
  PDF, 349 Кб, Файл опубликован: 1 окт 1994
  This application note presents a wide variety of data acquisition circuits. The detailed circuit schematics cover 8-, 10-, and 12- bit ADC and DAC applications, serial and parallel digital interfaces, battery monitoring, temperature sensing, isolated interfaces, and connections to various popular microprocessors and microcontrollers. An appendix covers suggested voltage references.
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  Application Note 62
  October 1994
  Data Acquisition Circuit Collection
  Kevin R. Hoskins
  INTRODUCTION
  This application note features 8-, 10-, and 12-bit data
  acquisition components in various circuit configurations.
  The circuits include battery monitoring, temperature sensing, isolated serial interfaces, and microprocessor and
  microcontroller serial and parallel interfaces. Also included are voltage reference circuits (Application Note 42
  contains more voltage reference circuits). Additional circuit information is located in the information
  references listed in the Circuit Index. Each information
  reference refers to either an application note (example:
  AN42 = Application Note 42), a data sheet (example:
  LTCВ®1292 DS = LTC1292 Data Sheet), or a design note
  (example: DN66 = Design Note 66).
  and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation. CIRCUIT INDEX
  FIGURE TITLE
  FIGURE NO.
  General Analog-to-Digital Application Circuits
  Two-Quadrant 150kHz Bandwidth Analog Multiplier . Figure 1 .
  Infinite Hold-Time Sample-and-Hold (tACQ = 240ns) . Figure 2 .
  Four-Quadrant 250kHz Bandwidth Analog Multiplier . Figure 3 .
  Demodulating a Signal Using Undersampling . Figure 4 . …

Design Notes

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  New 12-Bit Data Acquisition Systems Communicate with Microprocessors Over 4 Wires &mdash DN22
  PDF, 240 Кб, Файл опубликован: 1 май 1989
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  New 12-Bit Data Acquisition Systems Communicate with
  Microprocessors Over 4 Wires – Design Note 22
  As board space and semiconductor package pins become
  more valuable, serial data transfer methods between
  microprocessors (MPUs) and their peripherals become
  more and more attractive. Not only does this save lines
  in the transmission medium, but, because of the savings
  in the package pins, more function can be packed into
  both the MPU and the peripheral. Users are increasingly
  able to take advantage of these savings as more MPU
  manufacturers develop serial ports for their products (1-3).
  However, peripherals which are able to communicate with
  these MPUs must be available in order for users to take full
  advantage. Also, MPU serial formats are not standardized
  so not all peripherals can talk to all MPUs.
  The LTCВ®1290 Family
  A new family of 12-bit data acquisition circuits has been
  developed to communicate over just 4 wires to the recently
  developed MPU synchronous serial formats as well as
  to MPUs which do not have serial ports. These circuits
  feature software configurable analog circuitry including analog multiplexers, sample and holds, bipolar and
  unipolar conversion modes and the ability to shut power
  completely off. They also have serial ports which can be …

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  12-Bit 8-Channel Data Acquisition System Interfaces to IBM PC Serial Port &mdash DN35
  PDF, 101 Кб, Файл опубликован: 1 июн 1990
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  12-Bit 8-Channel Data Acquisition System Interfaces to IBM PC
  Serial Port – Design Note 35
  Guy Hoover and William Rempfer
  IBM PCs Collect Analog Data
  IBM PC compatibles can be found just about everywhere.
  In those instances where a PC is not already in place,
  battery operated portables are readily available. This
  makes the PC a good choice for controlling a data acquisition system. Typically, such data acquisition systems
  have been expensive. Using dedicated A/D cards or
  IEEE-488 controllers and instruments, these systems
  tie up slots in the PC and are not readily transportable
  from one machine to another. As an alternative, the
  schematic of Figure 1 shows a 12-bit, 8-channel data
  acquisition system that connects to the serial port of
  the PC. This system uses an LTC В®1290, a reference,
  a handful of other low cost components and requires
  12 lines of BASIC to transfer data into the PC. If only
  ten bits of resolution are required the LTC1290 can be
  replaced with an LTC1090. Additionally, if the LTC1090
  is used, the system can be powered directly from the
  PC serial port with the option shown. Two Glue Chips Provide the Interface
  The control and status lines of the PC serial port are
  used to send data to and receive data from the LTC1290. …

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  Signal Conditioning for Platinum Temperature Transducers &mdash DN45
  PDF, 69 Кб, Файл опубликован: 1 мар 1991
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  Signal Conditioning for Platinum Temperature Transducers
  Design Note 45
  Jim Williams
  High accuracy, stability, and wide operating range make
  platinum RTDs (resistance temperature detectors)
  popular temperature transducers. Signal conditioning
  these devices requires care to utilize their desirable
  characteristics. Figure 1’s bridge-based circuit is highly
  accurate and features a ground referred RTD. The ground
  connection is often desirable for noise rejection. The
  bridges RTD leg is driven by a current source while the
  opposing bridge branch is voltage biased. The current
  drive allows the voltage across the RTD to vary directly
  with its temperature induced resistance shift. The difference between this potential and that of the opposing
  bridge leg forms the bridges output.
  A1A and instrumentation amplifier A2 form a voltage
  controlled current source. A1A, biased by the LTВ®1009
  reference, drives current through the 88.7О© resistor and
  the RTD. A2, sensing differentially across the 88.7Ω resistor, closes a loop back to A1A. The 2k-0.1μF combination sets amplifier roll-off, and the configuration
  is stable. Because A1A’s loop forces a fixed voltage
  across the 88.7О© resistor, the current through Rp is
  constant. A1’s operating point is primarily fixed by the
  2.5V LT1009 voltage reference. …

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  Gain Trimming In Instrumentation Amplifier Based Systems &mdash DN51
  PDF, 78 Кб, Файл опубликован: 1 июн 1991
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  Gain Trimming In Instrumentation Amplifier
  Based Systems – Design Note 51
  Jim Williams
  Gain trimming is almost always required in instrumentation amplifier based systems. Gain uncertainties, most
  notable in transducers, necessitate such a trim.
  Figure 1, a conceptual system, shows several points as
  candidates for the trim. In practice, only one of these
  must actually be used. The appropriate trim location
  varies with the individual application.
  Figure 2 approaches gain trimming by altering transducer excitation. The gain trim adjustment results in
  changes in the LT®1010’s output. The LT1027 reference
  and LT1097 ensure output stability. Transducer output varies with excitation, making this a viable approach.
  It is important to consider that gain “lost” by reducing
  transducer drive translates into reduced signal-to-noise
  ratio. As such, gain reduction by this method is usually
  limited to small trims, e.g., 5-10%. Similarly, too much
  gain introduced by this method can cause excessive
  transducer drive, degrading accuracy. The transducer
  manufacturer’s data sheet should list the maximum
  permissible drive for rated accuracy.
  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. &9$*5"5*0/ …

Модельный ряд

Классификация производителя

• Space & Harsh Environment > Military Hermetic (M)
• Data Conversion > Analog-to-Digital Converters (ADC) > Precision ADCs (Fs < 10Msps) > Multi Channel ADCs

Варианты написания:

LTC1290CCSWTRPBF, LTC1290CCSW TRPBF