AD8417BRMZ

AD8417BRMZ Application Field and Working Principle

The AD8417BRMZ is a low-power, low-offset, dual-channel difference amplifier from Analog Devices. It is a monolithic CMOS device from the family of linear-amplifiers, instrumentation amplifiers, op-amps, buffer amplifiers, and the like. It is designed to accurately measure small differential signals, and is well suited for applications involving thermal and speed sensors, pressure transducers, bridge amplifiers, and other low-level voltage measurements in the industrial and medical fields.

Operating Principle

The operation of the AD8417BRMZ is based on the basic summing of two input signals. Each of the amplifier’s channels contains a series-input offset input buffer, which accurately drives two op-amps. The first stage is a multi-stage topology that offers excellent gain and frequency performance. The second stage includes a current-feedback output buffer amplifier. It features a low-offset voltage and improved Common Mode Rejection Ratio (CMRR).

The differential amplifier also includes an integrated error amplifier that eliminates the need for external compensation. The closed-loop, error comparator circuit tracks the overall difference in the two input signals to ensure accuracy. The combination of the offset buffer, first stage, and error amplifier provides excellent CMRR.

Key Features of AD8417BRMZ

• Low Power Consumption: The amplifier draws only 7 mA of current, while providing an input-referred offset voltage of 1 mV maximum.
• Accurate Differential Measurement: The amplifier can accurately measure small differential signals in the range of ± 75 mV to ± 3 V. It has a high-gain bandwidth of 200 kHz and a low-gain bandwidth of 450 Hz.
• Wide Operating Voltage: The amplifier operates from 2.7 to 5.5 V, making it suitable for a wide range of applications.
• Cost and Space Savings: The differential amplifier provides significant cost and space savings, as it combines multiple functions in a single device.

Applications for AD8417BRMZ

The low-power, low-offset, dual-channel, differential amplifier is particularly well suited for a variety of industrial and medical applications. It can be used for pressure and thermal sensor measurements, bridge amplifiers, and other low-level voltage measurements. It is ideal for applications that require accurate measurement of small, differential signals in a wide operating range.

The AD8417BRMZ is also suitable for medical imaging and diagnostics, electrochemical metrology, automotive and other industrial applications, and instrumentation applications. It is available in space-saving 8-lead MSOP and PDIP packages.