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ST’s op amp portfolio provides a unique choice of high performance, low power, precision op amps and tiny packages.

  • Largest  micropower op amp portfolio on the market, with consumption as low as 2 µA
  • Reliable high volume supplier of both standard and high-performance op amps
  • Space-saving packages, such as DFN, QFN, SOT-23 and SC-70

ST’s precision op amp solutions include zero drift amplifiers and amplifiers with a low offset drift over temperature. Thus the precision op amps from ST are a perfect fit for use with any sensor, including gas, temperature, pressure, and position sensors.
ST’s low-power operational amplifier solutions include widely used devices, but also provide design engineers with upgrade options such as better accuracy, a standby feature and small packages.
Our automotive-grade products are AEC-Q100 qualified and tested with certified high-reliability flow, to meet the very specific, rigorous demands of the automotive market.


Questions / Answers around Op-Amps

What is op-amp offset voltage?

When a zero differential input voltage is applied, the op-amp output voltage should be zero. In practice, this is not the case. The offset voltage by definition is the differential input voltage that is required to make the output voltage zero.

What is op-amp input offset voltage?

The input offset voltage parameter, generally called VIO, is defined as a DC voltage between the non-inverting and the inverting input. It is always specified in the electrical characteristics of a datasheet. It can be positive or negative.

input offset voltage
Low input offset voltage VIO is key for high precision

The VIO value will be different for each op-amp. And to ensure good precision, it is important to choose the op-amp with the lowest VIO, because the VIO will be amplified by the gain and added to the total output voltage as an error.

Some op-amps with a chopper architecture like ST's TSZ121 exhibit a VIO of 5 µV. They are especially good for precision DC measurements.

What is input bias current of an operational amplifier?

Input bias current (IB) is the current flowing through an op-amp's inputs. Due to op-amp biasing requirements and normal operation leakage, a very small amount of current (pA or nA range, depending on the technology) is flowing through its inputs. This can cause issues when large value resistors or sources with higher output impedances are connected at the op-amp inputs. This leads to relevant voltage drops at the op-amp input and therefore errors.

What do rail-to-rail input and output mean for an op-amp?

An op-amp with a high rail input is able to deal with input signals up to +VCC. While a low rail input is able to deal with signals down to -VCC. Rail-to-rail input op-amps can handle input signals from -VCC to +VCC. Rail-to-rail output is the capability of an op-amp to drive its output very close to the power supply rails.

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