SDAA488 August   2026 AMC0106M05 , AMC0106M25

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1System Introduction
  5. 2Inline Current Sense Device Options
    1. 2.1 Common-Mode Voltage Versus Working Voltage
    2. 2.2 Device Architecture Comparison
      1. 2.2.1 INA241: Non-Isolated Analog Amplifier with Inherent PWM Rejection
      2. 2.2.2 AMC0106: High CMRR Functionally Isolated Delta-Sigma Modulator
    3. 2.3 Performance Benefits Analysis
      1. 2.3.1 Accuracy and Precision
      2. 2.3.2 Noise Immunity
      3. 2.3.3 Size
      4. 2.3.4 Design Considerations
  6. 3Summary
  7. 4References

2.3.2 Noise Immunity

The INA241 incorporates enhanced PWM rejection filtering in the device, allowing the device to automatically blank the signal when needed during PWM switching to time current measurements and apply the proper filters and minimize the influence of switching transients. This allows INA241 to deliver accurate current measurements despite significant PWM-induced noise.

INA241 with Blanking Period and High PWM Rejection Filtering Architecture with 4x Oversampling and Averaging at 3MSPS ADC with Latency of 500ns Figure 2-3 INA241 with Blanking Period and High PWM Rejection Filtering Architecture with 4x Oversampling and Averaging at 3MSPS ADC with Latency of 500ns

Similarly, AMC0106M05 demonstrates exceptional noise immunity through multiple mechanisms. The galvanic isolation of the device prevents PWM switching noise induced errors, while the digital bit stream output remains immune to analog interference during signal transmission. The dual-ground architecture provides exceptional PWM rejection by isolating switching noise on the high-side ground plane.

AMC0106 with Separate Grounds for High-Side and Low-Side Allowing for Best Noise Performance Figure 2-4 AMC0106 with Separate Grounds for High-Side and Low-Side Allowing for Best Noise Performance