Energy measurement AFE
16 May 2012
Analogue, Mixed Signal, LSI
Microchip’s new energy measurement analog front end (AFE), the MCP3911, features two 24-bit, delta-sigma ADCs that operate at 3 V with accuracy of 94,5 dB SINAD and 106,5 dB THD. 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°C to +125°C. The device 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.
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