10 MHz operational amplifiers are useful in a wide variety of applications. With the TSZ901, STMicroelectronics leverages the chopper amplifier concept to create a device that has both high accuracy and excellent zero-drift properties. This means that the integrated circuit can be used in applications that demand high signal fidelity.

Chopper amplifiers use an advanced internal architecture to compensate for a variety of phenomena. In principle, the input signal is converted to an alternating current, then processed, and finally rectified/filtered. This eliminates a wide array of noise sources.

Fortunately, the user of the TSZ901 does not have to deal with any of these processes. Instead, the operational amplifier presents itself as a friendly-to-use SOT23 device with the pinout shown in the figure below.

Extremely Low Input Offset Voltages

STMicroelectronics\'s use of the chopper architecture minimizes the input offset voltage seen on the part. At an operating temperature of 25°C, the TSZ901 input offset voltage is usually around 1 µV; the data sheet-promised worst-case scenario is a highly respectable 5 µV. When spanning the entire operating temperature range from -40 to +125°C, the maximum input offset voltage of 8 µV is incredibly impressive.

The data sheet provides a histogram generated by measuring the offset voltage distribution across more than 13,000 individual samples. It presents itself as shown in the figure below.

Thanks to its excellent electrical properties, the TSZ901 is ideally suited to a vast range of metrology applications. For example, the figure below shows a low-side current-sensing system that can accurately measure the power consumed by a device under test.

Modern Simulation and Automotive-Grade Operational Amplifier Certification Available

Designers seeking to deploy the STMicroelectronics operational amplifier can purchase two different units. TSZ901ILT leads to a classic industrial version with the temperature range of -40 to +125°C. Ordering SKU TSZ901IYLT, instead, results in delivery of the automotive-certified integrated circuit variant.

Qualification and characterization processes were carried out in accordance with the well-established AEC Q100 and Q003 standards, ensuring that the component can be used in a variety of automotive applications.

Designers seeking to accurately qualify analog circuit behavior can visit STMicroelectronics\' macro-modeling website. It provides a variety of parameters and model files, which the data sheet goes on to describe as follows:

Accurate macromodels of the TSZ901 device are available on the STMicroelectronics website at www.st.com. These models are a trade-off between accuracy and complexity (that is, time simulation) of the TSZ901 operational amplifier.

Highly Flexible Power and Output Configurations

The TSZ901 is a fully rail-to-rail certified operational amplifier: both the input and output subsystems meet the criteria. Furthermore, the supply voltage range of 2.5V to 5.5V and the low power consumption of only 1.5 mA at 5V indicate that the device can be used in power-constrained applications, such as sensors.

The system can, furthermore, source and sink significant amounts of current: the data sheet contains a typical maximum of 50 mA in both positive and negative configurations.

Conclusion

If a device needs a highly reliable, accurate, and power-conservative 10 MHz operational amplifier, the STMicroelectronics TSZ901 is an ideal candidate. Thanks to the chopper architecture, a variety of phenomena that are usually interesting do not occur.