AD8279BRZ

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The AD8279BRZ is a fully-differential amplifier integrated circuit that is part of Analog Devices Linear Amplifiers - Instrumentation, OP Amps, Buffer Amps series. It is an amplifier specifically designed to read Bridge sensors and resistive transducers and as such, can only be placed in specific installations where it can measure and transmit signals accurately. Despite its limitation to bridge sensor applications, the AD8279BRZ is a versatile amplifier, equipped with several of the latest applications available.

Application Field

The AD8279BRZ bridge amplifier is built on the same 0.25μm CMOS process as other Linear Amplifiers - Instrumentation, OP Amps, Buffer Amps products, meaning it is designed to support various sensing applications which require high levels of accuracy. As its name suggests, the amplifier is generally used in bridge or resistive transducer-measurement applications, as it is capable of providing bridge readings with extraordinary precision and accuracy. Additionally, the amplifier can also be used in traditional instrumentation and test systems for the measurement of low-level signals.

The AD8279BRZ is a low-noise, high-performance amplifier, where its low-noise is a result of a small signal conversion of only 0.6μV RMS. Thanks to its low-noise and high linearity performance, the amplifier can be applied to a variety of bridge sensor-driven applications, such as medical instrumentation and test systems, precision automation equipment and industrial automation applications.

Working Principle

The AD8279BRZ is a single-supply, low-noise differential amplifier integrated circuit, specifically designed to read Bridge sensors and resistive transducers.

The amplifier operates by providing a wide-range input signal, allowing the user to measure the bridge-sensor accuracy even when the bridge sensor displays a bridge-offset. As a fully differential amplifier, the AD8279BRZ has a differential-mode gain A of 1, with a max differential input range of 20V and a total supply voltage of 5V. The amplifier has a wide bandwidth range of 20MHz, with a-to-a flat response of -3 dB up to 140kHz, ensuring a dynamic and versatile performance. Additionally, the compression factor of the amplifier shows notably low-noise performance, consequently aiding resolution of the measured bridge sensor’s output voltage.

However, despite its versatility, the amplifier is still limited to the measurements of Bridge Sensors. As a result, it has a gain-error characteristic, which refrains it from being used in applications involving non-bridge type sensors. Also, the amplifier is based on an R/R reference as opposed to a Vref, as the latter would create a temperature drift, thus it is not suitable for applications for which a high temperature drift is expected.

Conclusion

The AD8279BRZ bridge amplifier from Analog Devices Linear Amplifiers - Instrumentation, OP Amps, Buffer Amps series is a versatile and low-noise amplifier integrated circuit, specifically built for bridge sensor and resistive transducers measurements. The IC has a differential-mode gain A of 1 and a max differential input range of 20V, with a wide bandwidth range of 20MHz. Supported by its low-noise performance, and its linearity performance, the amplifier is designed to measure and transmit signals with precision and accuracy, making it suitable for medical instrumentation and test systems, precision automation equipment and industrial automation applications.

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