ISL28268FUZ

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The ISL28268FUZ is a precision low-power, low-noise, rail-to-rail, single-supply instrumentation amplifier that is suited for signal conditioning applications in medical, industrial, and consumer products. It features excellent signal-to-noise ratio of 82dB, low power consumption of 1.2mW at 3V, high bandwidth of 6.7MHz at ±5V, and two wide input common mode range options. The ISL28268FUZ is a 4-channel ADC driver intended for use in equipment requiring slight signal modulation and improved signal-to-noise ratio, such as blood volume probes, industrial process control systems, ultrasound, automotive controls, and consumer audio products.

The device provides superior accuracy and stability when used in both single- and multi-channel applications, making it suitable for use in closed-loop systems. Its rail-to-rail input and output swing with low offset voltage and high CMRR, along with its low distortion and noise performance make it suitable for a wide range of applications. The ISL28268FUZ is available in an industry-standard 6-pin package and is rated to operate over an extended temperature range of -40°C to +125°C.

Working Principle

The ISL28268FUZ uses a unique two-stage fully differential amplifier architecture to achieve its low power consumption and high linearity. The first stage of the device includes a pair of matched, high gain, low offset voltage differential transistors (Q1 and Q2) configured in a Wilson-type feedback loop. The high-speed, wide bandwidth differential input signals VINP and VINN are coupled to the bases of these transistors through the input buffer stage, which provides the necessary current to drive the bases. An adjustable gain selection resistor is connected between the bases for selecting the gain of the device. The first stage amplifies the differential input signal, and the output is then fed to the second stage for further amplification with programmable gain.

The second stage of the ISL28268FUZ is a low power rail-to-rail output stage. This stage provides an output voltage swing from 0V to VDD. A reference resistor network is provided on the device to generate the offset voltage in the output stage. The offset voltage is used to set the output floor to a known voltage. The output drive current is programmable and is adjustable using the output bias current selection resistor. The rail-to-rail output stage is powered using a biasing current provided through the output bias current selection resistance, thus reducing the power consumption of the output stage.

The ISL28268FUZ has a wide input common mode range of ±3.3V to ±9V and an output swing from 0V to VDD. The device’s high CMRR makes it well suited for noise-sensitive applications, such as medical and industrial process control. The device also features low-noise characteristics and distortion, making it ideal for use in ultrasonic, automotive control, and consumer audio applications. It also includes ESD protection and a thermal shutdown protection to enhance robustness.

Applications

The ISL28268FUZ is particularly well-suited for use in applications such as ultrasonic thickness gauges, medical instruments, industrial process control, automotive control systems, and consumer audio products. The wide input common mode range, low noise and distortion, and high CMRR of the device ensure accuracy and stability in closed-loop systems. The low power consumption and extended temperature range of the device make it suitable for use in battery powered applications. Additionally, the device reduces design time with its programmable gain and offset voltage.

ISL28268FUZ offers excellent performance and flexibility, making it suitable for a wide range of applications including medical instruments, industrial process control, automotive control systems, and consumer audio products. Its low power operation and wide input common mode range make it an ideal solution for low power and noise-sensitive applications. Its rail-to-rail output and high CMRR provide improved signal-to-noise ratio, while its programmable gain and offset voltage reduce design time.

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