Op Amp Pin Diagram: A Comprehensive Guide
Understanding the pin diagram of an operational amplifier (op amp) is crucial for anyone working with analog circuits. This guide will delve into the various pins of an op amp, their functions, and how they interact with each other. By the end, you’ll have a clear understanding of the intricacies of an op amp’s pin diagram.
Pin Configuration
The pin configuration of an op amp can vary depending on the manufacturer and the specific model. However, most op amps follow a similar pattern. Let’s take a look at the typical pin configuration of a dual op amp, such as the LM358.
| Pin Number | Function |
|---|---|
| 1 | Non-Inverting Input (V+) |
| 2 | Inverting Input (V–) |
| 3 | Output |
| 4 | Non-Inverting Input (V+) |
| 5 | Inverting Input (V–) |
| 6 | Output |
| 7 | Vcc (Positive Supply Voltage) |
| 8 | Vee (Negative Supply Voltage) |
As you can see, the LM358 has four inputs and four outputs, with pins 1 and 4 being the non-inverting inputs, and pins 2 and 5 being the inverting inputs. Pins 3 and 6 are the outputs, while pins 7 and 8 are the positive and negative supply voltages, respectively.
Non-Inverting Input (V+)
The non-inverting input (V+) is the positive input of the op amp. When a signal is applied to this pin, the output of the op amp will be in phase with the input signal. The voltage gain of the op amp is determined by the ratio of the feedback resistor to the input resistor connected to the inverting input.
Inverting Input (V–)
The inverting input (V–) is the negative input of the op amp. When a signal is applied to this pin, the output of the op amp will be out of phase with the input signal. The voltage gain of the op amp is determined by the ratio of the feedback resistor to the input resistor connected to the non-inverting input.
Output
The output pin of the op amp is where the amplified signal is available. The output voltage can be either positive or negative, depending on the input signal and the configuration of the circuit. The output voltage is limited by the supply voltage of the op amp.
Supply Voltage (Vcc and Vee)
The supply voltage pins (Vcc and Vee) provide the necessary power for the op amp to operate. The voltage difference between these two pins determines the output voltage range of the op amp. It’s important to ensure that the supply voltage is within the specified range to prevent damage to the op amp.
Common Op Amp Configurations
Op amps can be configured in various ways to perform different functions. Here are some common configurations:
-
Non-Inverting Amplifier: This configuration provides a voltage gain that is determined by the ratio of the feedback resistor to the input resistor. The output is in phase with the input signal.
-
Inverting Amplifier: This configuration provides a voltage gain that is determined by the ratio of the feedback resistor to the input resistor. The output is out of phase with the input signal.
-
Non-Inverting Summing Amplifier: This configuration allows
