Energy-measurement AFE has two 24-bit ADCs with desirable accuracy, low power and high-speed modes
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 3-V with accuracy of 94.5 dB SINAD and 106.5 dB THD. This provides desirable energy-meter and power-monitoring performance by accurately measuring from start-up to maximum current, and it enables fast 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-V 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 enables metering and monitoring designs.
Microchip Technology Inc.