SBAA646 October   2024 AMC0380D-Q1 , AMC0381D-Q1 , AMC0386-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2High Voltage Resistor Isolated Amplifiers and Modulators Advantages
    1. 2.1 Space Savings
    2. 2.2 Improved Temperature and Lifetime Drift of Integrated HV Resistors
    3. 2.3 Accuracy Results
    4. 2.4 Fully Integrated Resistors vs. Additional External Resistor Example
    5. 2.5 Device Selection Tree and AC/DC Common Use Cases
  6. 3Summary
  7. 4References

1 Introduction

As high voltage automotive and industrial designs evolve, the need for precise, safe, and power-efficient galvanically isolated voltage sensing designs intensify. The AMC038x product family is a group of isolated amplifiers and modulators with increased accuracy, enhanced integration, and greater functionality that can meet these requirements. Designed with integrated high voltage (HV) resistors, these devices are a significantly reduced design size contrasted to the conventional design using an external resistive divider. External high voltage resistive dividers can be large and costly to step the voltage down to a 1V or 2V level. Furthermore, the integrated resistors have very low temperature and lifetime drift in comparison to discrete resistors. This allows the AMC038x products to achieve better than 1% accuracy over temperature and lifetime without the need for calibration.