STMicroelectronics TSV792

TSV792 is a dual 50 MHz-bandwidth unity-gain-stable amplifier. The rail-to-rail input stage and the slew rate of 30 V/µs make the TSV792 ideal for low-side current measurement. The excellent accuracy provided by the maximum input voltage of 200 µV allows amplifying accurately small-amplitude input signal. TSV792 can operate from a 2.2 V to 5.5 V single supply; it can typically handle an output capacitor up to 1 nF and is fully specified on a load of 22 pF, therefore allowing easy usage as A/D converters input buffer.

Key features

• Gain bandwidth product 50 MHz, unity gain stable
• Slew rate 30 V/µs
• Low input offset voltage 50 µV typ., 200 µV max.
• Wide supply voltage range: 2.2 V to 5.5 V

Additional features

• 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 of 6.5 nV/√Hz @ 10 kHz
• Wide supply voltage range: 2.2 V to 5.5 V
• Rail-to-rail input and output
• Extended temperature range: - 40 °C to +125 °C
• Automotive-grade version available
• Additional benefits:
  • Accuracy of measurement virtually unaffected by noise or input bias current
  • Signal conditioning for high frequencies

Applications

• High bandwidth low-side and high-side current sensing
• Photodiode transimpedance amplification
• A/D converters input buffers
• Power management in solar-powered systems
• Power management in automotive applications

Additional Info

The main advantage of using the TSV79x for low-side current sensing relies on its low V_IO, compared to general-purpose operational amplifiers. 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 maximize the accuracy of the measurement.

 

 

Video

TSV792, High-bandwidth dual 5V op amps