The MCP3918 is a 2.7V to 3.6V single channel Analog Front End (AFE) containing a Delta-Sigma Analog-to-Digital Converter (ADC), PGA, internal voltage
reference, modulator output block, and highspeed 20 MHz SPI compatible serial interface. 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 large variety of voltage and current sensors including shunts, current transformers, Rogowski coils and Hall effect sensors

  16/24-bit Resolution Delta-Sigma A/D Converter

  Flexible serial interface that includes both SPI and a simple 2-wire interface ideal for polyphase shunt energy meters

  93.5 dB SINAD, -106.5 dBc THD

  2.7V - 3.6V AVDD, DVDD

  Programmable Data Rate up to 125 ksps- 4 MHz Maximum Sampling Frequency

  Oversampling Ratio up to 4096

  Ultra Low Power Shutdown Mode with <2 μA

  Low Drift 1.2V Internal Voltage Reference: 9 ppm/°C

  Differential Voltage Reference Input Pins

  High Gain PGA on Each Channel (up to 32V/V)

  Phase Delay Compensation with 1 μs Time Resolution

  Separate Data Ready Pin for Easy Synchronization

  24-bit Digital Offset and Gain Error Correction

  High-Speed 20 MHz SPI Interface with Mode 0,0 and 1,1 Compatibility

  Continuous Read/Write Modes for Minimum Communication

  Low Power Consumption

  Available in Small 20-lead QFN and SSOP Packages

  Specifications valid down to -45°C operation