Instrumentation Amp suits low-voltage applications.
Press Release Summary:
Operating at voltages from 1.8-5.5 V, AD8553 Features offset voltage of 25 µV max, offset voltage drift of 0.1 µV/°C max, and voltage noise of 0.7 µV p-p. Parasitic resistance in series with Vref pin does not degrade performance, allowing unit to attain CMRR performance of 120 dB min @ G=100 without using buffer amp to drive Vref pin. In shutdown mode, total supply current is reduced to less than 4 µA. Product is specified over -40 to +85°C.
Original Press Release:
New Analog Devices Instrumentation Amplifier Delivers Precision Performance to Low-Voltage Applications
Unmatched combination of high accuracy, low noise, and low price makes ADI's AD8553 in-amp ideal for portable medical devices and low-voltage industrial and communications applications.
Norwood, MA(5/31/2005) - Analog Devices Inc. (NYSE: ADI), a global leader in high-performance semiconductors for signal-processing applications and market leader in amplifiers, has released the industry's first instrumentation amplifier (in-amp) to offer high precision at voltages as low as 1.8 V. Because previous generations of in-amps operated only as low as 2.7 V, 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. 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. Optimized 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 1.8 V," 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 +1.8 V 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."
Medical, Industrial and Communications Applications
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 1.8 V targets portable medical devices, particularly those intended for at-home, non-invasive 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 gages, 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 base station control systems.
About the AD8553
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 V to +5.5 V. In shutdown mode, the total supply current is reduced to less than 4 microamps.
With low offset voltage of 25 microvolts max, offset voltage drift of 0.1 microvolts/degrees C max and voltage noise of only 0.7 microvolts p-p (0.1 Hz to 10 Hz), 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 120 dB min at G=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 converters, such as ADI's AD7466, AD7687 and AD7942.
Pricing and Availability
Fully specified over the industrial temperature range of -40 degrees C to +85 degrees C, the AD8553 is sampling now with production quantities available in September 2005. The device is packaged in 10-lead MSOP and is priced at $1.30 per unit in 1,000-piece quantities.
About Analog Devices
Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Celebrating 40 years as a leading global manufacturer of high-performance integrated circuits used in analog and digital signal processing applications, Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. 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.
