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Half-price instrumentation amplifiers from ADI deliver precision

Posted: 07 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:analog devices? adi? instrumentation amplifier? amplifier? ad8553?

Analog Devices Inc.'s instrumentation amplifier is said to combine accuracy, low noise and low price for portable medical devices and low-voltage industrial and communications applications.

The precision instrumentation amp (in-amp) features low-voltage supply operation from 1.8V to 5.5V. In shutdown mode, the total supply current is reduced to less than 4?A.

With low offset voltage of 25?A max, offset voltage drift of 0.1?V/C max and voltage noise of only 0.7?V peak to peak (0.1Hz to 10Hz), the device is especially suited 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 amplifier to attain very high common mode rejection (CMR) performance of 120dB minimum at gain=100 without the use of a buffer amplifier driving the Vref pin, said Steve Sockolov, product line director for precision amplifiers at Analog Devices. The amplifier can also be used for driving and buffering converters.

The amplifier is the first low-voltage, instrumentation amplifier to offer high precision down to 1.8V, making it suited for battery-powered medical devices, such as blood pressure and glucose monitors, Sockolov said.

Optimized for applications that require low-voltage signal performance, the amplifier delivers best-in-class performancevery high CMR even at low gains, low offset and low offset drift for the highest DC accuracy, and low-noise operationat half the price of competitive solutions, according to Sockolov.

"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," Sockolov said.

Fully specified over the industrial temperature range from -40C to 85C, the AD8553 is sampling now with production quantities slated for September. The device is packaged in 10-lead MSOP and is priced at $1.30 per unit in 1,000-piece quantities.

- Bettyann Liotta


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