ZHCSV99C February   1997  – October 2024 XTR105

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings #GUID-80F0CD5F-C345-42B2-B6A9-580512790460/R_DESCRIPTION_LI1
    2. 5.2 Recommended Operating Conditions
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics
    5. 5.5 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Linearization
        1. 6.3.1.1 High-Resistance RTDs
      2. 6.3.2 Voltage Regulator
      3. 6.3.3 Open-Circuit Protection
      4. 6.3.4 Reverse-Voltage Protection
      5. 6.3.5 Surge Protection
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 External Transistor
      2. 7.1.2 Loop Power Supply
      3. 7.1.3 2-Wire and 3-Wire RTD Connections
      4. 7.1.4 Radio Frequency Interference
      5. 7.1.5 Error Analysis
    2. 7.2 Typical Applications
    3. 7.3 Layout
      1. 7.3.1 Layout Guidelines
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 接收文档更新通知
    3. 8.3 支持资源
    4. 8.4 Trademarks
    5. 8.5 静电放电警告
    6. 8.6 术语表
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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7.1.2 Loop Power Supply

The voltage applied to the XTR105, V+, is measured with respect to the IO connection, pin 7. V+ can range from 7.5V to 36V. The loop-supply voltage, VPS, differs from the voltage applied to the XTR105 according to the voltage drop on the current sensing resistor, RL (plus any other voltage drop in the line).

If a low loop-supply voltage is used, RL (including the loop wiring resistance) must be made a relatively low value so that V+ remains 7.5V or greater for the maximum loop current of 20mA:

XTR105

For loop currents up to 30mA, design for V+ equal or greater than 7.5V to allow for out-of-range input conditions.

The low operating voltage (7.5V) of the XTR105 allows operation directly from personal computer power supplies (12V ±5%). When used with the RCV420 current loop receiver (see Figure 7-3), the load resistor voltage drop is limited to 3V.

XTR105 ±12V Powered Transmitter-Receiver Loop Figure 7-3 ±12V Powered Transmitter-Receiver Loop