SLOS180D February   1997  – April 2026 TL031 , TL032 , TL032A , TL034 , TL034A

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  Thermal Information
    3. 5.3  Recommended Operating Conditions
    4. 5.4  TL031C and TL031AC Electrical Characteristics
    5. 5.5  TL031C and TL031AC Operating Characteristics
    6. 5.6  TL031I and TL031AI Electrical Characteristics
    7. 5.7  TL031I and TL031AI Operating Characteristics
    8. 5.8  TL032C and TL032AC Electrical Characteristics
    9. 5.9  TL032C and TL032AC Operating Characteristics
    10. 5.10 TL032I and TL032AI Electrical Characteristics
    11. 5.11 TL032I and TL032AI Operating Characteristics
    12. 5.12 TL034C and TL034AC Electrical Characteristics
    13. 5.13 TL034C and TL034AC Operating Characteristics
    14. 5.14 TL034I and TL034AI Electrical Characteristics
    15. 5.15 TL034I and TL034AI Operating Characteristics
    16. 5.16 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 Typical Values
    2. 6.2 Input Bias and Offset Current
    3. 6.3 Noise
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Input Characteristics
      2. 7.1.2 Output Characteristics
      3. 7.1.3 Transimpedance Amplifier
      4. 7.1.4 4mA to 20mA Current Loops
      5. 7.1.5 Instrumentation Amplifier with Linear Gain Adjust
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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机械数据 (封装 | 引脚)
  • D|8
  • P|8
  • PS|8
散热焊盘机械数据 (封装 | 引脚)
订购信息

7.1.4 4mA to 20mA Current Loops

Often, information from an analog sensor must be sent over a distance to the receiving circuitry. For many applications, the most feasible method involves converting voltage information to a current before transmission. The following circuits give two variations of low-power current loops. The circuit in Figure 7-5 requires three wires from the transmitting to receiving circuitry, while the second variation in Figure 7-6 requires only two wires, but includes an extra integrated circuit. Both circuits benefit from the high input impedance of the TL03xA because many inexpensive sensors do not have low output impedance.

Assuming that the voltage at the noninverting input of the TL03xA is zero, the following equation determines the output current:

TL031 TL031A TL032 TL032A TL034 TL034A

The circuits presently provide 4mA to 20mA output current for an input voltage of 0 to 100mV. By modifying R1, R2, and R3, the input voltage range or the output current range can be adjusted.

Including the offset voltage of the operational amplifier in the above equation clearly illustrates why the low offset TL03xA is used:

TL031 TL031A TL032 TL032A TL034 TL034A

For example, an offset voltage of 1mV decreases the output current by 0.17mA.

Due to the low power consumption of the TL03xA, both circuits have at least 2mA available to drive the actual sensor from the 5V reference node.

TL031 TL031A TL032 TL032A TL034 TL034A Three-Wire 4mA to 20mA Current Loop Figure 7-5 Three-Wire 4mA to 20mA Current Loop
TL031 TL031A TL032 TL032A TL034 TL034A Two-Wire 4mA to 20mA Current Loop Figure 7-6 Two-Wire 4mA to 20mA Current Loop