SBOA575 September   2023 INA823 , OPA2387 , XTR115 , XTR116

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Theory of Operation
    1. 2.1 Wheatstone Bridge Sensor
    2. 2.2 2-Amp INA
    3. 2.3 4-20-mA Current Loop Transmitter Interface
  6. 3Simulation
  7. 4PCB Design
  8. 5Verification and Measured Performance
  9. 6Summary
  10. 7Reference
  11.   Appendix

4 PCB Design

The PCB schematic, layers, and bill of materials can be found in the Appendix 2: PCB Details.

The design uses 0.1% thin film resistors and X7R ceramic bypass capacitors. Any capacitors used for filtering are C0G ceramic capacitors.

Typical layout best practices are followed in this PCB design (for example, short traces, low-impedance ground connections, nearby decoupling capacitors). An additional copper pour is placed around the external transistor (Q1) to help dissipate heat.