This family of amplifiers has ultralow offset, drift, and bias current. The AD8571, AD8572, and AD8574 are single, dual, and quad amplifiers, respectively, featuring rail-to-rail input and output swings. All are guaranteed to operate from 2.7 V to 5 V single supply.
The AD8571/AD8572/AD8574 provide benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Analog Devices, Inc., topology, these zero-drift amplifiers combine low cost with high accuracy. (No external capacitors are required.) Using a patented spread-spectrum, auto-zero technique, the AD8571/AD8572/AD8574 eliminate the intermodulation effects from interaction of the chopping function with the signal frequency in ac applications.
With an offset voltage of only 1 μV and drift of 0.005 μV/°C, the AD8571/AD8572/AD8574 are perfectly suited for applications where error sources cannot be tolerated. Position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature range. Many more systems require the rail-to-rail input and output swings provided by the AD8571/AD8572/AD8574.
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
- EVAL-PRAOPAMP-1KSZ (Single 5-Lead SC70) KS-5
- EVAL-PRAOPAMP-1RJZ (Single 5-Lead SOT 23) RJ-5
- EVAL-PRAOPAMP-1RMZ (Single 8-Lead MSOP) RM-8
- EVAL-PRAOPAMP-1RZ (Single 8-Lead SOIC) R-8
Demystifying Auto-Zero Amplifiers Part 2
by Eric Nolan and Reza Moghimi (Analog Dialogue, May 2000)
Demystifying Auto-Zero Amplifiers Part 1
by Eric Nolan (Analog Dialogue, March 2000)
MS-2062: To Chop or Auto-Zero: That Is the Question.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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