Microchip MCP3903 analog front end for three-phase energy metering

Microchip Technology Inc. announced its first high-accuracy, stand-alone six-channel analog front end (AFE) for three-phase energy metering.

The MCP3903 AFE includes six 16-/24-bit Delta-Sigma analog-to-digital converters (ADCs) and delivers signal-to-noise and distortion (SINAD) of 89 dB (typical) and total harmonic distortion (THD) of -99 dB (typical) .

Additional integrated features include programmable gain amplifiers, a low-drift voltage reference and phase-delay compensation, for a reduced external component count that increases design flexibility and lowers costs. The MCP3903 AFE is intended for the utility and industrial markets, such as in utility meters, power-monitoring devices and instrumentation devices.

Key highlights :

  • Six simultaneously sampled 16/24-bit resolution delta-sigma A/D converters
  • 91 dB SINAD, -100 dBc THD, 102 dB SFDR
  • Programmable data rate up to 64 ksps
  • Internal voltage reference with low drift of 5 ppm/°C
  • Internal PGAs on each channel with gain of 32 V/V
  • Phase delay compensation between channels with 1 µs resolution
  • Extended Temperature Range: -40°C to +125°C
  • 28-pin SSOP package

Pricing : $3.14 each, in 10,000-unit quantities.

Availability : Samples are available today, at Volume-production quantities can be ordered today at

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