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Analog Devices Press Release - August 15, 2011
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Analog Devices' RMS-to-DC Converter Ensures Accuracy
and Best-in-Class Dynamic Range
 Analog
Devices’ RMS-to-DC Converter Ensures Accuracy and Best-in-Class Dynamic Range
NORWOOD, Mass.--( BUSINESS WIRE)-- Analog Devices, Inc. (ADI) unveiled today 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
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. 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 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.
* Download data sheet and order samples:
www.analog.com/AD8436
* Get support at ADI’s EngineerZone:
http://ez.analog.com/community/amplifiers
* Learn more with the RMS-to-DC Conversion Application Guide:
http://www.analog.com/static/imported-files/design_handbooks/17505283758302176206322RMStoDC_Cover-Section-I.pdf
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
Availability, Pricing and Complementary Components
Complementary components to the AD8436 in low noise, low power, precision applications include the
AD7190 24-bit Sigma Delta A/D converter and the
ADR3433 micropower, high accuracy voltage references.
About Analog Devices
Acknowledged industry-wide as the world leader in data-conversion and
signal-conditioning technologies, Analog Devices is a leading global manufacturer of high-performance integrated
circuits used in analog and digital signal processing applications. The company serves over 60,000 customers,
representing virtually all types of electronic equipment. Analog Devices' common stock is listed on the New York
Stock Exchange under the ticker “ADI” and is included in the S&P 500 Index.
http://www.analog.com
Follow ADI on Twitter at
http://www.twitter.com/ADI_News
To subscribe to Analog Dialogue, ADI’s monthly technical journal, visit:
http://www.analog.com/library/analogDialogue/
Contacts
Analog Devices, Inc.
Colleen Cronin, 781-937-1622
Colleen.cronin@analog.com
DDate Posted 8/15/2011
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