The RMS-to-DC Converter

Published:2011/8/25 0:59:00 Author:Phyllis From:SeekIC

The RMS-to-DC converter released by Analog Devices Inc. recently offers a usable dynamic range of 100μV to 3V and the ability to measure extremely low signal levels with high accuracy and no drop in settling time.

RMS is an important measure for AC signal. RMS-to-DC converters produced by ADI are widely used in applications that require high precision and low power measurement. This kind of converter provides ‘real time’ measurements. There are no latency issues that limit the frequency response of other technologies and complex waveforms that not limited to sine-waves. ADI provides a wide range of optimized RMS-DC converters to meet the need of True RMS.

The AC conversion accuracy of AD8436 is better than ±0.5 percent. And its uniform settling for widely variant input values enables consistent conversion rates with results displayed promptly for near-zero and high-level AC input. Factors like temperature crest factor and supply voltage variations can not affect the AD8436 which is particularly useful for high transit signals and can be used in designs currently using AD736 and AD737 with improved performance. Zero DC offset voltages at the converter output simplify calibration. This performance is packed into a compact 4mm×4mm package integrated with a FET input and precision DC buffer amplifiers and consumes 300μA of power.

The AD8436 is suitable for remote, portable battery-powered instrumentation, energy and automotive applications where limited board space and outdoor environments are considerations. The AD8436 is the first RMS-to-DC converter specified to operate in the extended industrial temperature range of -40℃ to 125℃. It is also available in 0℃ to 70℃ temperature range version.

About ADI

Analog Devices Inc. engages in the design, manufacture, and marketing of analog, mixed-signal, and digital signal processing integrated circuits used in industrial, communication, computer, and consumer applications. The company’s products convert real-world phenomena, such as light, sound, temperature, motion, and pressure into electrical signals. Its products are used in a range of electronic equipment, including industrial process controls, factory automation systems, instrumentation products, energy management systems, defense electronics, automobile, medical imaging equipment, portable wireless communication devices, cellular base stations, central office networking equipment, computers, digital cameras, and digital televisions.

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