TIDUFC1 November   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 ADS127L21B
      2. 2.3.2 REF81
      3. 2.3.3 REF54
      4. 2.3.4 RES21A
      5. 2.3.5 THP210
      6. 2.3.6 OPA828
  9. 3System Design Theory
    1. 3.1 Range Selection
    2. 3.2 Linearity and Low-Noise Signal Chain
    3. 3.3 Calibration
    4. 3.4 Additional System Design Considerations
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Description
      1. 4.1.1 PCB Interface
      2. 4.1.2 Input Multiplexer
      3. 4.1.3 Gain Multiplexer
      4. 4.1.4 Power Supplies
      5. 4.1.5 Clock Tree
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
    4. 4.4 Test Results
      1. 4.4.1 Integral Nonlinearity Measurements
      2. 4.4.2 Noise Simulation
      3. 4.4.3 Noise Measurements
      4. 4.4.4 Conclusion
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Tools
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author

4.4.2 Noise Simulation

Figure 4-10 shows the TINA-TI schematic used to simulate the complete signal chain noise. Figure 4-11 shows the simulation results. DMM noise is often specified in numbers of power line cycles (PLC), which represents one cycle of the power line frequency. A higher PLC indicates a longer measurement integration time. For example, 5 PLC indicates the DMM measured for 5 power line cycles. A higher PLC results in a more accurate measurement at the cost of increased measurement time. At 60Hz, or 1 PLC, the simulated noise is less than 1μVRMS.

TIDA-010970 TIDA-010970 TINA-TI Simulation SchematicFigure 4-10 TIDA-010970 TINA-TI Simulation Schematic
TIDA-010970 Total Noise for TIDA-010970 for All Input RangesFigure 4-11 Total Noise for TIDA-010970 for All Input Ranges