Saturday, May 18, 2024

Fast Signal Conditioning and Current Sensing with Precision Op Amp

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The device has a range of characteristics that makes it suitable for applications from industrial to signal filtering

Combining 50MHz gain-bandwidth with precision attributes including low input offset voltage and low input voltage noise of just 6.5nV/√Hz is the TSV792 dual 5V operational amplifier (op-amp) that also has a 50MHz gain-bandwidth, enabling accurate amplification of high-frequency signals.

With a fast slew rate of 30V/µs, the TSV792 is suitable for photodiode-signal conditioning in battery-powered smoke detectors. The device’s efficient processing of the photodetector output signal allows it to save energy for features such as wireless networking.

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An input offset voltage of 50µV (at 25 degrees Celsius) makes the TSV792 perform accurate low-side current sensing in motor-control applications and power systems such as industrial power supplies, telecom and network infrastructure supplies, and renewable-energy conversion.

At the same time, its ability to handle an output capacitance of up to 1nF and full specification on a load of 22pF makes it a high-speed, high-precision solution for filter applications and input buffering of analogue-to-digital converters (ADCs).

High measurement accuracy is achieved with maximum input offset voltage over a temperature range from -40 degrees Celsius to 125 degrees Celsius without the addition of external components such as precision resistors that increase BOM cost. Trimming or calibrating circuits during production can also be avoided.

A wide supply-voltage range, from 2.2V to 5.5V makes the TSV792 to be powered from the same supply as other low-voltage digital ICs such as the system host MCU and can run from a deeply discharged battery to extend equipment runtime. The op-amp is unity-gain stable and benefits from rail-to-rail input and output, permitting a wide variety of design topologies and simplified circuit designs.

The TSV792 is in production now in the Mini SO-8 package. The DFN8 2mm x 2mm package will be available from STMicroelectronics at the beginning of 2021. 


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