AD8691AKSZ-R2

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The AD8691AKSZ-R2 is a low noise, low distortion, instrumentation amplifier with a specified 2.5 MHz bandwidth. It is a single supply 0.25 Ω input impedance instrumentation amplifier ideal for strain and bridge sensor measurements. The instrumentation amplifier features a differential default output that compensates for offset voltage and gain error. Additionally, the amplifier offers excellent power supply rejection (PSR), common-mode rejection (CMR) and offset adjustment.

The AD8691AKSZ-R2 is a rail-to-rail input and output amplifier that operates on supplies between 3V and 6V. The amplifier has an offset voltage of 0.05V at 25°C and a wide temperature range of - 40°C to + 85°C. The gain range of the amplifier is from 1 to 200V/V and it has a power dissipation of 90mW. The THD for the amplifier is 0.001% and the output noise is 18nV/√Hz.

An instrumentation amplifier is an amplifying device that is used to measure small signals such as those from strain gauges, thermocouples, and microphones. It typically consists of multiple stages of amplification and filtering. Instrumentation amplifiers are commonly used in medical instrumentation, portable systems, and industrial process control applications. An instrumentation amplifier is a type of differential amplifier which is optimized for maximum common-mode rejection ratio, resilience to noise and other electrical disturbances, and maintenance of gain accuracy over temperature.

The AD8691AKSZ-R2 is a two-stage instrumentation amplifier. The first stage is a differential amplifier with an input stage composed of two matched transistors. The second stage is an inverting gain stage with a gain range of up to 200. The adjustable 12th order low-pass filter can provide rejection of out of band frequencies, allowing the amplifier to measure small signals in the presence of larger interfering signals.

The input stage of the AD8691AKSZ-R2 utilizes an integrated differential amplifier which provides common-mode rejection up to 100dB. The low noise amplifier has a gain accuracy of 0.1% and is immune to drift due to thermal effects. The large signal bandwidth is 2.5MHz and unity gain frequency is 25MHz. The quiescent power supply current is low, only 400uA, allowing for low power operation in battery powered systems.

The output stage of the amplifier is a rail-to-rail output amplifier that operates with a supply voltage range of 3 V to 6 V. A 12th order low pass filter at the output of the amplifier provides additional signal filtering and noise rejection. The output stage features a very low output noise of 18 nV/√Hz which ensures an accurate measurement of small signals in noisy environments.

The AD8691AKSZ-R2 is a low noise, low distortion amplifier with a wide dynamic range and very accurate differential output. The integrated differential amplifier and adjustable filter provide superior noise rejection and signal filtering. The low noise amplifier and rail-to-rail output stage are ideally suited for low power operation in portable systems. The AD8691AKSZ-R2 is ideal for use in medical instrumentation, process control, and other applications that require accurate measurement of small signals and high common-mode impedance.

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