The MCP3918 is a 3V single-channel Analog Front End （AFE）， containing one delta-sigma， Analog-to-Digital Converter （ADC）， one programmable gain amplifier （PGA）， phase delay compensation block， low-drift internal voltage reference， digital offset and gain errors calibration registers， and high-speed 20 MHz SPI-compatible serial interface. The MCP3918 ADC is fully configurable with features such as： 16-/24-bit resolution， Oversampling Ratio （OSR） from 32 to 4096， gain from 1x to 32x， independent Shutdown and Reset， dithering and auto-zeroing. Communication is largely simplified with 8-bit commands， including various continuous read/write modes and 16-/24-/32-bit data formats that can be accessed by the Direct Memory Access （DMA） of an 8-/16-/32-bit MCU， and with the separate Data Ready pin that can be directly connected to an Interrupt Request （IRQ） input of an MCU. The MCP3918 includes advanced security features to secure the communications and the configuration settings， such as a CRC-16 checksum on both serial data outputs and on the register-map static configuration. It also includes a register-map lock through an 8-bit password to avoid the processing of any unwanted write commands. For polyphase shunt-based energy meters， the MCP3918 2-Wire serial interface greatly reduces system cost， requiring only a single bidirectional isolator per phase. The MCP3918 is capable of interfacing a variety of voltage and current sensors， including shunts， current transformers， Rogowski coils and Hall effect sensors