Microchip MCP3911 energy-measurement front end

The MCP3911 features two 24-bit, delta-sigma ADCs that operate at 3 V with 94.5 dB SINAD and 106.5 dB THD accuracy.

This provides better energy meter and power monitoring performance by accurately measuring from start-up to maximum current, enabling faster calibration during production. Four different power modes offer the flexibility of enabling either low power designs, to 0.8 mA per channel, or designs for higher speed signals and harmonic content.

The extended temperature range allows operation from -40 to 125°C.

The energy-measurement front end also features 2.7 to 3.6 V analog and digital operation, which simplifies the interface by running off the same power rail as the microcontroller. An internal, low temperature coefficient voltage reference, along with PGAs on each channel, further enables metering and monitoring designs.