AMC1311: different VCC

Hi Fred,

Yes, these are both devices that provide isolation in a circuit, meaning that they separate the high voltage side of a circuit (motor, electrical grid, etc.) and the low voltage side of a circuit (MCU, FPGA, DSP). Both sides of the circuit (high and low voltage sides) must be powered. The article below can provide a quick overview 

https://www.electronicdesign.com/power-management/whitepaper/21130089/texas-instruments-introduction-to-isolated-amplifiers-and-modulators

 We also have TIPL videos available that cover similar content: https://training.ti.com/ti-precision-labs-isolation-introduction-isolated-modulators

We also have devices with integrated DC/DC converters that remove the need for a high side voltage supply to greatly simplify the design as discussed in this article:

https://e2e.ti.com/blogs_/b/analogwire/posts/simplify-your-isolated-current-and-voltage-sensing-designs-with-single-supply-isolated-amplifiers-and-adcs

Please let me know if you have additional questions.