The MCP3905/6 energy-metering Integrated Circuits (ICs) supply active real power measurements for single-phase residential meter designs. The goal of this application note is to discuss design decisions relating to meter design when using the MCP3905 or MCP3906 device that will lead to IEC compliance. This note can be used for both MCP3905/6 stand-alone meters and PICmicro microcontroller-based meters using the MCP3905/6 devices as the Analog Front-End (AFE). In both meter designs, the system accuracy and EMC immunity rely on the AFE design.