Analog front end devices enable highly accurate energy measurement

Microchip Technology Inc. announces an advanced energy-measurement analog front end (AFE), the MCP3911, which features two 24-bit, delta-sigma ADCs that operate at 3 V with very high accuracy of 94.5 dB SINAD and 106.5 dB THD. This provides better energy meter and power-monitoring performance by accurately measuring from start-up to maximum current, and also enables faster calibration during production.

Four different power modes offer the flexibility of enabling either extremely 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 MCP3911 also features 2.7 to 3.6 V analog and digital operation, which simplifies the interface by running off of the same power rail as the microcontroller. An internal, low-temperature-coefficient voltage reference, along with PGAs on each channel, further supports metering and monitoring designs.

For more information, visit Microchip Technology Inc., 2355 W. Chandler Blvd., Chandler, AZ 85224. Phone: (480) 792-7200.