RMS-to-DC converter offers high accuracy and dynamic range
August 16, 2011 // Christoph Hammerschmidt
Analog Devices has developed an integrated true RMS-to-DC converter offering a very high usable dynamic range and the ability to measure extremely low signal levels with high accuracy and no drop in settling time. The AD8436 is targeting remote, portable battery-powered instrumentation, energy and automotive applications where limited board space and outdoor environments are considerations.
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, the vendor claims. Zero DC offset voltages at the converter output simplify calibration. This 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 µA of power.
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.
Accpording to Analog Devices, 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 ADIs 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.
For data sheet and samples, visit: www.analog.com/AD8436.
Parrot takes instant 3D mapping to the sky
March 03, 2015
On nVidia's booth at embedded world, a robot arm was swinging a stereo camera assembly, in a drone-like fashion, demonstrating ...
European chip market contracted in January
Finely patterned OLEDs prove key to organic lasers
Intel selects ST micromirrors for human-machine interface
Printed OLEDs make large advertising more communicative
IKEA and Samsung back Qi wireless charging advance
March 03, 2015
Global home furnishings retailer IKEA has breathed new life into the wireless charging market with the launch of Qi-powered ...
Motor drive analyser leverages 8-channel, high-definition oscilloscope
Tronics offers to license MEMS processes to foundries
OmniVision, eyeSight, push gesture towards the smartphone
- High Performance Portable DC Bench Power Supply: Save Money and Free Up Bench Real Estate by Building Your Own
- Software-Defined Radio Handbook
- A Four-Quadrant DC/DC Switching Regulator Smoothly Transitions from Positive to Negative Output Voltages for FPGA and Other Applications
- LED Driver with Integrated Spread Spectrum Reduces EMI without Adding Flicker
InterviewInfineon: CAN FD success goes at the expense of FlexRay
The faster version of the venerable CAN bus, CAN FD is currently taking off at several carmakers. Infineon's Thomas Böhm, Head of Body / Automotive, believes this could well go at the expense of FlexRay. ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
To ensure you have a good start in 2015, Freescale is giving away five of its QorIQ TWR-LS1021A Tower system modules, worth USD269 each, for EETimes Europe's readers to win.
The module is the most feature-rich and high-performance Tower system offered by Freescale, enabling compatibility and interoperability with the growing list of Tower expansion modules, offering an easily accessible...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.