RMS-to-DC converter ensures accuracy and best-in-class dynamic range

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By eeNews Europe

The AD8436 precision monolithic true RMS-to-DC converter features AC conversion accuracy to better than ± 0.5 percent.  Uniform settling for widely variant input values enables consistent conversion rates with results displayed promptly for near-zero and high-level AC inputs.  The AD8436 is immune to temperature, crest factor and supply voltage variations.  Zero DC offset voltages at the converter output simplify calibration.

The performance is packed into a compact 4 mm x 4 mm package integrated with a FET input and precision DC buffer amplifiers and consumes only 300 uA of power.  The AD8436 is a good choice for remote, portable battery-powered instrumentation, energy and automotive applications where limited board space and outdoor environments are considerations.   
RMS (root mean square) is a fundamental measurement of the magnitude of an AC and DC signal and is a better measure of the power in a signal than simple averaging.  RMS-to-DC converters are used in applications where precise, low power measurement of AC/DC signals is the prime objective. The AD8436 system-on-a-chip design computes the precise DC equivalent of the RMS value and provides a level of linearity and accuracy across the entire input range that enables engineers to design systems with 90 dB of dynamic range.  
The AD8436 extends the crest-factor to 10 – approximately double the current industry-standard digital solution – with minimal loss of accuracy. It is particularly useful for high transit signals and can be used in designs currently using ADI’s low-power, true RMS-to-DC converters such as the AD736 and AD737 with improved performances.  The device is laser trimmed and characterised at 300-mV RMS input and comes with dual and single power supplies.  The AD8436 is the first RMS-to-DC converter specified to operate in the extended industrial temperature range of -40°C to 125°C.  It is also available in a 0°C to 70°C temperature range version.
Availability and Pricing

The AD8436A is packaged in a 20-lead LFCSP 4 mm x 4 mm and is in full volume production and priced at $4.95 each per 1,000.

The AD8436J is packaged in a 20-lead LFCSP 4 mm x 4 mm and is in full volume production and priced at $2.95 each per 1,000.

More information about the AD8436 true RMS-to-DC converter at


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