TS27L4ACN

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The TS27L4ACN is a single supply, low power, high precision instrumentation amplifier typically targeted at medical applications, since it is patient contact-rated and can be powered from a single battery. It is used primarily as a buffer amplifier, and comes with a wide voltage range, low input bias current, low total output error, low drift and low noise.

Application Field

The TS27L4ACN has many different applications, but is most commonly used in medical applications, such as patient monitoring, ECG, EEG, blood pressure measuring and other biomedical instrumentation. The chip is specifically designed for low power operation from a single battery and its high precision makes it ideal for these applications, where accuracy and precision are paramount.

The TS27L4ACN is also used in the industrial sector for pressure sensing. Its low noise and wide voltage range make it suitable for this purpose. Additionally, it is used in industrial process control and optical equipment.

Working Principle

The TS27L4ACN utilizes a differential amplifier with three stages and a level shift circuit to provide an extremely high input impedance, wide voltage range, high accuracy and low power operation. The three stages consist of a matched pair of input resistors, a differential amplifier and a level shift circuit. The output of the first stage is up to 25dB, while the output of the second and third stage can be up to 45dB.

The level shift circuit uses a voltage divider network to generate two voltages that are used to create a zero point reference, which allows the chip to compensate for offsets, hysteresis and gain variation. Additionally, the amplifier can also be configured for use as a summing amplifier or a sampling amplifier.

The TS27L4ACN is powered by a single battery, but can also be powered directly from a wall adapter. For higher accuracy, the chip includes a power supply rejection circuit, which minimizes power supply fluctuations and ensures a high accuracy output signal. Additionally, it also includes an output stage, which eliminates the need for external resistors.

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