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The MCP3901 is a dual channel Analog Front End （AFE） containing two synchronous sampling DeltaSigma Analog-to-Digital Converters （ADC）， two PGAs， phase delay compensation block internal voltage reference， modulator output block， and high-speed 20 MHz SPI compatible serial interface. The converters contain a proprietary dithering algorithm for reduced Idle tones and improved THD. The internal register map contains 24-bit wide ADC data words， a modulator output byte， as well as six writable control registers to program gain， oversampling ratio， phase， resolution， dithering， shutdown， Reset and several communication features. The communication is largely simplified with various Continuous Read modes that can be accessed by the Direct Memory Access （DMA） of an MCU and with a separate data ready pin that can be connected directly to an Interrupt Request （IRQ） input of an MCU. The MCP3901 is capable of interfacing to a large variety of voltage and current sensors， including shunts， current transformers， Rogowski coils and Halleffect sensors.
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