Product category: Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: AD8553
Edited by the Electronicstalk Editorial Team on 2 June 2005
Instrumentation amplifier runs
down to 1.8V
Analog Devices has released the industry's first instrumentation amplifier to offer high precision at voltages as low as 1.8V
Analog Devices has released the industry's first instrumentation amplifier (in-amp) to offer high precision at voltages as low as 1.8V. Because previous generations of in-amps operated only as low as 2.7V, many ultra-low-voltage applications, such as medical monitoring devices, could not benefit from the combination of precision performance, low-noise operation and reduced pricing offered by in-amps.
This article was originally published on Electronicstalk on 2 June 2005 at 8.00am (UK)
Related stories
Video decoder and HD digitiser come together
Complete single-chip system for improving video image and colour quality in advanced high-definition TVs, video processors, audio/video receivers and DVD recorders
Reference design networks home entertainment
HDAnywhere is based on ADI's Wavescale compression; the same JPEG2000-based technology used in digital cinema and broadcast television systems
For applications where precision is crucial, in-amps magnify small signals while rejecting large amounts of noise that can interfere with the accuracy of measurements.
Optimised for a broad range of industrial, communications and medical applications that require low-voltage operation, the AD8553 provides significant performance advantages at half the price of competing solutions.
'The growing at-home medical monitoring market is driving the demand for high precision, portable products that operate at voltages as low as 1.8V', said Steve Sockolov, Product Line Director for Precision Amplifiers at Analog Devices.
'With the introduction of the AD8553, ADI is extending the company's proven expertise in developing highly accurate, low-noise in-amps to +1.8V applications'.
'Prior to the AD8553, lower voltage systems could only achieve high levels of precision performance by using discrete solutions that required additional trimming, consumed more board space, and were extremely costly and difficult to implement'.
Further reading
Modulator and demodulator cover a broad band
The ADL5375 and ADL5382 devices enable equipment designers to implement and standardise on solutions that address the wide range of operating frequency bands and standards
Direct digital synthesiser is made for handhelds
The AD9913 is the first DDS device to deliver a 250MHz clock rate while consuming as little as 50mW of power
Video collaboration upgrades media players
The combined efficiency of the RealVideo format and the performance of the Blackfin processor deliver a high-quality level of video playback traditionally not found in personal media players
The AD8553 provides superior performance to a variety of low-voltage medical, industrial and communications applications.
A power-saving shutdown mode that extends battery life combined with low-noise operation at 1.8V targets portable medical devices, particularly those intended for at-home, noninvasive patient use such as blood pressure and glucose monitors.
High-performance hospital equipment such as electrocardiogram monitors and defibrillators, and industrial applications such as strain gauges, weigh scales, and pressure sensors benefit from the high precision and high CMRR (common mode rejection ratio).
The AD8553's high DC accuracy is also of benefit to low-side current sensing and other monitoring functions in communications basestation control systems.
The AD8553 precision in-amp features very high CMRR even at low gains, low offset and low offset drift for the highest DC accuracy, low-noise operation and low-voltage operation from +1.8 to +5.5V.
In shutdown mode, the total supply current is reduced to less than 4uA.
With low offset voltage of 25uV maximum, offset voltage drift of 0.1uV/C maximum and voltage noise of only 0.7uV peak-peak (0.1 to 10Hz), the AD8553 is ideal for applications where error sources cannot be tolerated.
Unlike many in-amps, parasitic resistance in series with the Vref pin does not degrade performance, allowing the AD8553 to attain very high CMRR performance of at least 120dB min at a gain of 100 without using a buffer amplifier to drive the Vref pin.
The rail-to-rail output of the AD8553 makes it ideal for driving and buffering convertors, such as ADI's AD7466, AD7687 and AD7942.
Fully specified over the industrial temperature range of -40 to +85C, the AD8553 is sampling now with production quantities available in September 2005.
The device is packaged in 10-lead MSOPs and is priced at $1.30 per unit in 1000-piece quantities.
• Analog Devices: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
