Energy-measurement AFE integrates two 24-bit ADCs

Microchip Technology Inc. announced its next-generation energy-measurement analog front end (AFE), the MCP3911, which features two 24-bit, delta-sigma ADCs that operate at 3V with 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 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°C 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. 

Availability: Sampling and volume production, in 20-pin SSOP and QFN packages. 

Datasheet: MCP3911