Analog front-end for metering

11 November 2009 Analogue, Mixed Signal, LSI

The MCP3901 from Microchip is a new analog front-end (AFE) for metering applications, featuring dual 16-/24-bit Delta-Sigma ADCs with up to 91 dB signal to noise and distortion (SINAD); internal programmable gain amplifiers (PGAs) and voltage reference; phase-delay compensation; and a modulator output block, enabling highly precise measurements. With its extensive feature set, high-speed sample rates up to 64 KSps and SPI interface, the device is suitable for a variety of single- and multiphase metering, industrial and medical applications. Integrated PGAs and a low-drift voltage reference enhance the MCP3901’s ability to measure signals at very small levels, and reduce the number of external components needed. The phase-delay compensation block enables the device to compensate for differences in phase for three-phase energy-metering applications, while the SPI interface provides a simple connection to a microcontroller.

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