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Microchip Introduces 18-Bit Delta-Sigma ADC in SOT-23 Package

December 15, 2006

The low-power ADC provides the highest resolution available in an SOT-23 and features an onboard programmable gain amplifier and voltage reference for smaller designs.


CHANDLER, AZ /BUSINESS WIRE/ -- Microchip Technology Inc., a leading provider of microcontroller and analog semiconductors, announced the "highest resolution analog-to-digital converter (ADC) available in a SOT-23 package." The low-power, 18-bit, Delta-Sigma MCP3421 ADC features an integrated voltage reference and programmable gain amplifier (PGA) on-chip, which reduces the need for external components and enables a smaller overall design footprint. With its 6-pin package, low power consumption and high resolution, the new ADC is ideal for portable measurement applications in the industrial, medical, consumer, and automotive markets.

The MCP3421 ADC uses an I2C compatible serial interface and operates from a single power supply (2.7 V–5.5 V). Microchip's low-power technology enables the device's extremely low power consumption of just 155 µA at 5 V continuous conversion, which helps to extend battery life in portable measurement devices. Additionally, with the device's onboard PGA, users can select the gains of x1, x2, x4, or x8 before the analog-to-digital conversion takes place, enabling very high-resolution conversion of even small input signals. The integrated voltage reference and oscillator lessen the need for external components, resulting in simpler designs and a smaller overall design footprint.

"Manufacturers are constantly pressured to provide more compact, higher resolution products that last longer on smaller batteries," said Bryan Liddiard, Vice President of Marketing with Microchip's Analog and Interface Products Division. "The MCP3421 ADC meets these needs. It consumes very little power and provides 18-bit resolution, plus an integrated PGA and voltage reference—all in a miniature SOT-23 package."

Example applications for the MCP3421 ADC include portable devices in the following markets: industrial (portable instrumentation, pressure sensors, weigh scales, handheld meters, and multimeters); medical (heart rate monitors and blood glucose meters); consumer (weigh scales and handheld meters); and automotive (sensor interfaces and fuel gauges).

Development Support
For designers wanting to evaluate the MCP3421 ADC in their applications, Microchip offers the MCP3421 Evaluation Board (Part # MCP3421EV). The board is available today on the company's Web site for $15.

Pricing and Availability
Samples of the MCP3421 ADC are available now on the company's Web site. The device is available in a 6-pin, SOT-23 package for $1.71 each in 10,000-unit quantities. Volume production orders can be placed on the company Web site.

For additional information, contact any Microchip sales representative or authorized worldwide distributor, or visit Microchip's Web site.

Microchip Customer Support
Microchip is committed to supporting its customers by helping design engineers develop products faster and more efficiently. Customers can access four main service areas on the company Web site. The support area provides a fast way to get questions answered; the sample area offers free evaluation samples of any Microchip device; microchipDIRECT provides 24-hour pricing, ordering, inventory, and credit for convenient purchasing of all Microchip devices and development tools. Finally, the training area educates customers through webinars, sign-ups for local seminar and workshop courses, and information about the annual MASTERs events held throughout the world.

About Microchip Technology
Microchip Technology Inc. is a leading provider of microcontroller and analog semiconductors, providing low-risk product development, lower total system cost, and faster time to market for thousands of diverse customer applications worldwide. Headquartered in Chandler, AZ, Microchip offers outstanding technical support along with dependable delivery and quality. For more information, visit the Microchip Web site.

The Microchip name and logo are registered trademarks of Microchip Technology Inc. in the U.S. and other countries. All other trademarks mentioned herein are the property of their respective companies.


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