Integrated resistor devices

The AMC0380D04-Q1, AMC0381D10-Q1 and AMC0386M10-Q1 family of galvanically isolated voltage sensing amplifiers and modulators integrate high-voltage resistive dividers and eliminate the need for large and expensive external resistors to step down the voltage to a ±1V or 0V to 2V level. Stand-alone high-voltage resistors can take up a lot of space on PCBs, given that you may need as many as 15 high-voltage resistors to step down the voltage and maintain the system’s isolation ratings. Stand-alone high-voltage resistors are also a significant source of measurement error, lifetime drift and temperature drift, and require end-of-line calibration.

When it comes to conserving board space, the AMC0380D04-Q1 ±400V_AC input isolated amplifier, AMC0381D10-Q1 1,000V_DC input isolated amplifier and AMC0386M10-Q1 ±1,000V_AC input isolated modulator save system-level costs and reduce solution size as much as 50% by removing the need for external high-voltage resistors, as shown in Figure 2.

Integrating the high-voltage resistors into our isolated voltage-sensing devices eliminates the need for a large resistor ladder. We’ve also eliminated the need for system-level calibration by calibrating out the gain error of the internal resistor for the AMC0380D04-Q1, AMC0381D10-Q1 and AMC038610-Q1 in our factories, which can save you manufacturing time and costs.

These devices can also help increase system efficiency through improved accuracy. The integrated divider features very low temperature and lifetime drift compared to discrete resistors, enabling voltage measurements with an accuracy <1%.

For more information on integrated resistor devices, see the application note, Increased Accuracy and Performance with Integrated High Voltage Resistor Isolated Amplifiers and Modulators.