Power
Analog Devices RMS-To-DC Converter ensures accuracy and Best Converter Ensures Accuracy And Best-In-Class Dynamic Range
Analog Devices, Inc unveiled an integrated true RMS-to-DC converter that offers a best-in-class 100 µV to 3 V of usable dynamic range and the ability to measure extremely low signal levels with high accuracy and no drop in settling time.
The 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 characterized 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.
AD8436 Precision, Low Power, Monolithic True RMS-to-DC Converter Key Features:
Instantly computes true RMS value
◦Fast and constant settling time at all input levels
◦Wide usable dynamic range: 100 uV RMS to 3 VRMS (8.5 V p-p) full-scale
◦Input frequency range: 65 kHz for additional 1 percent error
◦Low power: 300 µA typical at ±2.4 V
◦Accuracy: ±10 μV ± 0.5 percent of reading max
System-on-a-chip includes FET input buffer with precision gain setting resistors, output buffer
Supply range:
◦Dual: +/-2.4 V to +/-18 V
◦Single: 4.8 V to 36 V