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
Machine learning for every app
October 02, 2015
Startup company Dato wants to make a splash in the consumer market by making it easier for developers to integrate machine-learning ...
Cyber threats against cars are here to stay, experts say
BAIC launches R&D centre in Aachen
NXP-Freescale: merger of 'compatible' giants on track
TSMC turns logic FinFET into ReRAM
Invisibility cloak focuses on enhancing solar cell efficiency
October 01, 2015
Scientists of Karlsruhe Institute of Technology (KIT) have discovered an unconventional approach to increasing the efficiency ...
Measuring the most stable light source in the world
3D memory chips may beat 3D hybrid memory cube
Are mushrooms the answer to lithium-ion battery degradation?
- Determine Balancing Current for the LTC3305 Lead-Acid Battery Balancer
- 3 Ways to Simplify Medical Device Testing
- Thread Networking Protocol Simplifies Connecting “Things” in the Home and Beyond
- High Voltage CMOS Amplifier Enables High Impedance Sensing with a Single IC
InterviewCEO interview: Ambiq sees broader options for low voltage
Mike Noonen, recently appointed interim CEO at microcontroller startup Ambiq Micro, discusses the focus and opportunities for this pioneering company designing circuits that can operate below the threshold ...
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
This month, LabNation is giving away three of its SmartScope open source USB oscilloscopes, worth 229 Euros each, for EETimes Europe's readers to win.
Successfully funded through Kickstarter last year, the SmartScope is claimed to be the world's first test equipment designed to run on multiple operating systems and platforms such as smartphones, tablets and PCs. It is powered directly from... 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.