Half-price instrumentation amplifiers deliver precision

Norwood, Mass. — 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 +1.8 V to +5.5 V. In shutdown mode, the total supply current is reduced to less than 4 μA.

With low offset voltage of 25 μV max, offset voltage drift of 0.1 μV/°C max and voltage noise of only 0.7 μV peak to peak (0.1 Hz to 10 Hz), the device is especially suited for applications where error sources cannot be tolerated. Unlike many in-amps, parasitic resistance in series with the V ref pin does not degrade performance, allowing the amplifier to attain very high common mode rejection (CMR) performance of 120 dB minimum at gain=100 without the use of a buffer amplifier driving the V ref 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 1.8 V, 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 performance — very high CMR even at low gains, low offset and low offset drift for the highest DC accuracy, and low-noise operation — at 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 -40°C to +85°C, 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. Click here for the AD8553 data sheet.

Analog Devices , 1-800-262-5643,

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