Auto Electronics

Microchip adds 22-bit delta-sigma A/D for automotive sensor applications

Microchip Technology Inc. has added the 22-bit MCP3550 to its family of low-power, high-resolution delta-sigma A/D converters. With an extended temperature range (-40 °C to +125 °C) that suits it for automotive sensor applications, the device offers low-current operation of 120 µA typical and rejects 50 Hz or 60 Hz noise greater than 120 dB. It features INL of ±2 ppm typical, output noise as low as 2.5 µV rms and power consumption of 0.6 mW maximum at 5 V. The MCP3550-50 offers 50 Hz noise rejection and a 12.5 sps sample rate while the MCP3550-60, with 60 Hz noise rejection, operates at 15 sps. Both offer auto calibration with every conversion. Each is packaged in an 8-pin MSOP that measures 3.1 x 3.1 x 1.18 mm,

"Our customers are challenged to design smaller and smaller devices that use fewer components, while providing highly accurate measurements and longer battery life," said Trent Butcher, senior product marketing engineer with Microchip's Analog and Interface Products Division. "With its low current operation, frequency rejection and 22-bit resolution, the MCP3550 A/D converter addresses these challenges."

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