Instrumentation amplifier combines low noise, power and distortion for precision signal detection in industrial applications
June 22, 2011 // Paul Buckley
Analog Devices, Inc., has introduced an ultra-low noise, low-power low-distortion instrumentation amplifier (in amp) for the precision measurement of small signals present in noisy industrial operating environments. The new high-bandwidth AD8429 in amp claims to be one of the fastest in amps on the market with a current feedback architecture that offers 15 MHz (G=1) bandwidth and a 22-V/μs slew rate, which is 30 percent higher than competing in amps.
With a low distortion of -130 dB, the AD8429 is robust enough for applications that demand reduced size, power and distortion levels, such as healthcare instrumentation, precision data acquisition equipment and industrial vibration analysis.
With 1-nV/√Hz input noise and 45-nV/√Hz output noise, the AD8429 operates across the extended industrial temperature range of -40 to 125˚C. Input bias current of 50-nA is orders of magnitude lower than the 12,000-nA bias current of other in amps, while the 100-μV input offset voltage of the AD8429 is two to three times lower.
The AD8429 has a 90-dB CMRR (common-mode rejection ratio) when operating in dc mode and an 80-dB CMRR in ac mode, which prevents unwanted signals from corrupting smaller signal acquisition. The CMRR increases with the gain to provide high signal rejection when it is needed most, and ADI's high-performance pin configuration allows the AD8429 to reliably maintain high CMRR at frequencies well beyond those of typical instrumentation amplifiers. This high-level of precision performance is available in a 4-mm x 5-mm, JEDEC compliant, plastic SOIC_N (small outline package, narrow body) package.
The AD8429 provides analog design engineers with a versatile, flexible in amp featuring a ±4-V to ±18-V dual power supply. Gain is set from 1 to 10,000 with a single resistor, and a reference pin allows the user to offset the output voltage. The feature can be useful to shift the output level when interfacing to a single-supply signal chain.
The AD8429 packaged in an 8-lead SOIC is in full volume production now and is priced at $3.50 each per 1,000.
More information about the AD8429 instrumentation amplifier at
Sensors for wearable electronics on 40% CAGR
March 05, 2015
Wearable electronics will be the big opportunity for sensors after margins shrink in smartphones and tablet computers, according ...
Understanding capacitors, ripple and self-heating
Fan-out wafer level packaging fills gap to 3D, says Yole
Sony switches to OLEDs to upgrade VR helmet
Tower makes IR sensor for Intel RealSense
Polymer blend improves solar cell efficiency by 200 percent
March 04, 2015
A University of Cincinnati research partnership has developed a blend of polymers which could make solar cells stronger, ...
Stress tracker tames drivers
Glass coated cathode promises lithium-sulfur battery performance gains
Femtocell improves in-car mobile connectivity
- 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.