ST Releases 50MHz Precision Op-Amp for High-Speed Signal Conditioning and Current Sensing
The 50MHz gain-bandwidth product enables accurate amplification of high-frequency signals
STMicroelectronics’ TSV792 dual 5V operational amplifier (op amp) combines 50MHz gain-bandwidth with precision attributes
including low input offset voltage and extremely low input voltage noise of just 6.5nV/√Hz.
The typical 50MHz gain-bandwidth product enables accurate amplification of high-frequency signals. Adding a fast slew rate of 30V/µs, the TSV792 is suited to photodiode-signal conditioning in battery-powered smoke detectors. By efficiently processing the photodetector output signal, the TSV792 saves energy for extra features such as wireless networking that add value to smart-home products.
With typical input offset voltage of 50µV (at 25°C), the TSV792 performs 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.
Moreover, the TSV792’s ability to handle an output capacitance 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 analog-to-digital converters (ADCs).
The precision qualities of the new ST op amp, with maximum input offset voltage specified over the extended temperature range from -40°C to 125°C, allow high measurement accuracy without special external components such as precision resistors that add to BOM cost. Trimming or calibrating circuits during production can also be avoided.
Having a wide supply-voltage range, from 2.2V to 5.5V, the TSV792 can be powered from the same supply as other low-voltage digital ICs such as the system host microcontroller, 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.
Features of the TSV792 Dual Op-Amp include:
- Gain bandwidth product 50 MHz, unity gain stable
- Slew rate 30 V/µs
- Low input offset voltage 50 µV typ., 200 µV max.
- Low input bias current: 2 pA typ.
- Low input voltage noise density 6.5 nV/√Hz @ 10 kHz
- Rail-to-rail input and output
- Extended temperature range: - 40 °C to +125 °C
- Automotive grade version available
- Accuracy of measurement virtually unaffected by noise or input bias current
- Signal conditioning for high frequencies
More information on the TSV792 Dual Op-Amp is available on the ST Web site
STMicroelectronics TSV792 product page.
The company's Web site address is www.st.com.
[Reprinted with kind permission from STMicroelectronics - Release Date, 8th December, 2020]