Op Amp Types

Dual Supply / Single Supply / Rail-to-Rail Op Amps

Op amps can be classified into 3 main types based on the input/output voltage range: Dual Supply, Single Supply, and Rail-to-Rail. The input/output voltage range of each type of op amp is shown below.

Sample Op Amp Input/Output Voltage Range

Dual Supply Op Amps

Since op amps generally amplify small signals close to 0V, when 0V input is required, in the case of a dual supply op amp VEE must be set to -1.5V or less. For this reason, a negative power supply is often used, and since both positive and negative supplies are required, it is called a dual supply op amp.

 > Low Noise Power Supply Op Amps (Product Search)

 > Low Offset Dual Supply Op Amps (Product Search)

Single Supply Op Amps (Ground Sense)

When inputting signals near 0V, a negative voltage is needed if using a dual supply op amp (general purpose), but an op amp that enables input without this negative voltage is called a single supply op amp. It is also referred to as a ground sense op amp since it can operate up to the ground level input signal.

 > General Purpose Ground Sense Op Amps (Product Search)

 > High-Speed Ground Sense Op Amps (Product Search)

 > Low Current Ground Sense Op Amps (Product Search)

 > Low Noise Ground Sense Op Amps (Product Search)

 > High-Performance Ground Sense Op Amps (Product Search)

Rail-to-Rail Op Amps (Input/Output Full Swing)

With the recent trend towards energy conservation, a greater number of sets are being driven at low voltages. Op amps also need to operate at low voltages, but if the VCC drops to nearly 5V, a single supply op amp is able to only input 1.5V less than VCC, which can be inconvenient. In contrast, a Rail-to-Rail op amp can operate normally even when the input voltage swings from VEE to VCC.
Because it can input/output over the full supply voltage range (VEE to VCC), it is often called an input/output full swing op amp.

 > High Speed Input/Output Full Swing Op Amps (Product Search)

 > Low Current Consumption Input/Output Full Swing Op Amps (Product Search)

 > Low Noise Output Full Swing Op Amps (Product Search)

 > Low Offset Input/Output Full Swing Op Amps (Product Search)

For application circuit examples of various types of op amps, please refer to the application notes using the link below.

 > Op Amp Application Circuit Examples (Application Notes)

The next page defines noise characteristics, which is a major issue with op amps.