Microchip Expands Lineup of 22-Bit Delta-Sigma ADCs

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Microchip Expands Lineup of 22-Bit Delta-Sigma ADCs [Copy link]

Microchip expands 22-bit delta-sigma analog-to-digital converter lineup.

New analog-to-digital converters can suppress 50 or 60 Hz line frequency noise and achieve high-precision measurement.

Microchip Technology Inc. (Microchip Technology) recently announced that its low-power, high-resolution delta-sigma analog-to-digital converter series has added a new member - the new MCP3550 joins the just-launched MCP3551 and MCP3553 low-power analog-to-digital converters, becoming the smallest low-power analog-to-digital converter on the market with a resolution higher than 16 bits. This new 22-bit device uses an 8-pin MSOP package (3.1 mm x × 3.1 mm x × 1.18 mm) and its typical current is as low as 120μA microamperes when operating. In addition, the new device can suppress 50 Hz or 60 Hz line frequency noise, providing high-precision measurement solutions for consumer, industrial, battery-powered and portable equipment.

The integral nonlinearity (INL) of the MCP3550 analog-to-digital converter is typically ±2 ppm, the maximum power consumption at 5V is 0.6 mW, and the output noise is as low as 2.5 μV root mean square (RMS). The new device can block noise higher than 120 dB at 50 Hz or 60 Hz line frequencies, so that the measurement value is not affected by the noise of the supply equipment at these two frequencies on the power line, so that the measurement work is not affected, thereby providing high-precision measurement and clearer and more effective resolution.

Trent Butcher, senior product marketing engineer for Microchip's analog and interface products division, said: "Our customers are faced with the challenge of designing smaller devices with fewer components while providing higher accuracy measurements and longer battery life. To meet the above challenges, the MCP3550 analog-to-digital converter has industry-leading low-current operation, frequency rejection and 22-bit resolution. In addition, the new device uses a small 8-pin MSOP package, which is very suitable for space-constrained applications such as portable and battery-powered electronic devices."

The MCP3550-50 (50 Hz rejection) has a sampling rate of 12.5 times per second, while the MCP3550-60 (60 Hz rejection) has a sampling rate of 15 times per second. Both analog-to-digital converters are automatically calibrated at each conversion and can operate over an extended temperature range of -40oC to +125oC.

The new ADCs are ideal for a wide variety of applications, including industrial (instruments, pressure sensors, weighing scales, handheld meters and multimeters), medical (heart rate monitors and blood glucose meters), consumer (weighing scales and handheld meters) and automotive (sensor interfaces).

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