ADI launches new high-speed and high-precision instrumentation amplifier

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ADI launches new high-speed and high-precision instrumentation amplifier [Copy link]

Analog Devices Inc. has released two digitally programmable gain instrumentation amplifiers that offer superior accuracy and bandwidth as well as the speed and precision required for advanced industrial and instrumentation applications. These applications, including test, control, and high-speed data acquisition systems, require fast, accurate measurements and robust signal conditioning over a wide voltage range.

The AD8250 and AD8251 general-purpose instrumentation amplifiers achieve up to 12 MHz bandwidth while reducing their temperature drift by 75%. Using ADI's iCMOS (industrial CMOS) manufacturing process, the AD8250 and AD8251 digitally programmable gain instrumentation amplifiers have a source current of only 3.5 mA and are packaged in a 10-pin ultra-small outline plastic package (MSOP) that reduces package size, greatly reducing their size.

"Data acquisition systems, automatic test equipment, and biomedical instrumentation all require wide bandwidth and high DC accuracy. Manufacturers try to meet this requirement by launching a variety of instrumentation amplifiers or combinations of discrete components," said Steve Sockolov, product line director of ADI's Precision Signal Processing Division. "ADI's new programmable gain instrumentation amplifiers offer industry-leading wide bandwidth and high precision with low power and small packages, allowing users to improve performance and increase channel density while maintaining ease of use in end equipment."

Wide voltage range, fast settling time, and low drift

The AD8250 and AD8251 are particularly suitable for industrial and instrumentation equipment that require a wide voltage operating range. They operate from ±5 V to ±12 V supplies and provide 12 MHz bandwidth and 0.5 microsecond (μs) to 0.01% settling time. The 1 μV/°C offset voltage and 10 ppm/°C gain drift are the lowest among all programmable gain instrumentation amplifiers.

Gain setting

provides additional flexibility by providing the new instrumentation amplifier family with digitally programmable gain, which allows designers to adjust gain even after the device has been installed in the system. The two instrumentation amplifiers are identical except for gain settings, with the AD8250 offering gain settings of 1, 2, 5, and 10 and the AD8251 offering gain settings of 1, 2, 4, and 8. The user interface allows the designer to set the 2-bit gain control word in one of three ways: use the clock input to lock the gain control word; set the gain control word within 1 μs in transparent mode; or set the control bit high or low to maintain the set gain. Compatible with High-Performance ADCs

The AD8250 and AD8251 instrumentation amplifiers are suitable for use with high-performance ADCs, such as Analog Devices' AD7621, AD7671/74/77/78/79, AD7685, and AD7946/47 PulSAR ADCs, and with Analog Devices' ADR431 and ADR435 voltage references.