Electronics Weekly
Called TSV792, the op amp is unity-gain stable and has rail-to-rail inputs and outputs.
“The typical 50MHz gain-bandwidth product enables accurate amplification of high-frequency signals,” according to the company. “Adding a slew rate of 30V/µs, the TSV792 is suited to photodiode-signal conditioning in battery-powered smoke detectors.”
Input offset is typically 50µV at 25°C – suiting it to low-side current sensing in motor-control applications, said the company.
“The main advantage of using the TSV79x for a low-side current sensing [diagram left] relies on its low input offset voltage, compared to general purpose operational amplifiers,” according to the product data sheet (section 6.1). “For the same current and targeted accuracy, the shunt resistor can be chosen with a lower value, resulting in lower power dissipation, lower drop in the ground path, and lower cost. Particular attention must be paid to the matching and precision of Rg1, Rg2, Rf1, and Rf2, to maximise the accuracy of the measurement.”
The output can handle an output load of 1nF and has full specification with 22pF on the output.
Operation is over 2.2 to 5.5V and -40 to 125°C, with the supply range allowing it to be powered from the same supply as a host microcontroller and a somewhat discharged battery.
It is included in ST’s 10-year longevity program, which guarantees long-term availability for industrial products.
It is already available in a 3.0 x 4.9mm miniSO-8 package and a 2 x 2mm DFN8 packaged version is scheduled for early next year. The data sheet also mentions a conventional 4.9 x 6.0mm SO-8 version
Other potential applications, said ST, are filtering and input buffering for ADCs, and power sensing in industry, telecoms, network infrastructure supplies and renewable-energy converters.
TSV791 is a similar single op amp available in a SOT23-5.
The TSV792 product page is here and the data sheet here
