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Energy Measurement Analog Front End Has Two 24-bit ADCs

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As the global energy-metering infrastructure is being upgraded and the power-monitoring market is growing, designers of energy measurement and other signal acquisition applications are looking for ways to increase performance while lowering costs. Microchip Technology is addressing these needs with accurate analog front ends (AFEs) that reduce power consumption with their low-power modes and reduce costs by decreasing the number of required power rails and external components.

A next-generation energy measurement analog front end (AFE) features two 24-bit, delta-sigma ADCs that operate at 3V with industry-leading accuracy of 94.5 dB SINAD and 106.5 dB THD. The MCP3911 provides better energy meter and power monitoring performance by accurately measuring from start-up to maximum current, and 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 3.6V 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 enables metering and monitoring designs. Pricing ranges from $1.40 to $1.43 each, in 5,000-unit quantities. Microchip also announced a tool that enables development with these new AFEs. The MCP3911 Evaluation Board for 16-bit MCUs ($79.99) is also available today.

Microchip Technology
Chandler, AZ.
(888) 624-7435
www.microchip.com