MC34072DR2G Detailed explanation of pin function specifications and circuit principle instructions

The "MC34072DR2G" is a part number for a specific operational amplifier from ON Semiconductor. Here's a detailed explanation of the requested information:

1. Brand

Manufacturer: ON Semiconductor

2. Package and Pin Configuration

Package Type: The "DR2G" suffix corresponds to a SOIC-8 (Small Outline Integrated Circuit) package. The device comes in an 8-pin configuration, as indicated by the 8 pins in the part number.

3. Pinout and Pin Functions

For an MC34072 operational amplifier in an 8-pin SOIC package, the pinout and functions are as follows:

Pin Number Pin Name Function Description 1 Offset Null This pin is used to adjust the input offset voltage of the amplifier. It is typically used in offset calibration. 2 Inverting Input (V-) This is the inverting input terminal where the negative voltage input is applied. 3 Non-Inverting Input (V+) This is the non-inverting input terminal where the positive voltage input is applied. 4 V- This is the negative Power supply pin. Connect to the negative rail of the power supply. 5 Output The output pin where the amplified signal is provided. 6 V+ This is the positive power supply pin. Connect to the positive rail of the power supply. 7 NC (No Connect) This pin is not internally connected to the device circuitry. It can be left unconnected in most cases. 8 Offset Null Another pin for offset voltage adjustment. This pin allows further fine-tuning for the input offset calibration.

4. Functional Principles of Operation

Operational Amplifier (Op-Amp) Basics: The MC34072 is a dual operational amplifier designed for use in a variety of analog signal processing applications. It typically amplifies voltage differences between the inverting and non-inverting inputs (pins 2 and 3). The output (pin 5) is fed back to the input (pins 2 and 3) to control the gain of the amplifier.

Power Supply:

The power supply for this op-amp is connected to the V+ (pin 6) and V- (pin 4) pins. These pins provide the necessary power for the operational amplifier to function.

The V- pin connects to the negative power rail, while the V+ pin connects to the positive power rail.

Offset Nulling:

The offset null pins (pins 1 and 8) are used to adjust any inherent input offset voltage of the amplifier. Adjusting these pins ensures that the output is zero when the input is zero.

Inverting and Non-inverting Inputs:

The Inverting Input (pin 2) and Non-Inverting Input (pin 3) are used to apply the signal inputs. The difference in voltage between these two inputs is amplified and presented at the output pin.

5. 20 Frequently Asked Questions (FAQs)

Q# Question Answer 1 What is the MC34072DR2G and what is its primary application? The MC34072DR2G is a dual operational amplifier from ON Semiconductor, commonly used in signal amplification, filtering, and other analog applications requiring high precision. 2 How many pins does the MC34072DR2G have? The MC34072DR2G comes in an 8-pin SOIC package. 3 What is the significance of the Offset Null pins (Pins 1 and 8)? The Offset Null pins are used for adjusting the internal input offset voltage of the operational amplifier, helping to eliminate the offset between the inputs for precise operation. 4 Can the MC34072DR2G operate without the Offset Null pins being used? Yes, the MC34072DR2G can operate without using the Offset Null pins, but if high precision is needed, these pins should be adjusted to minimize offset errors. 5 How do I connect the power supply to the MC34072DR2G? Connect V+ (pin 6) to the positive supply rail and V- (pin 4) to the negative supply rail to power the MC34072DR2G operational amplifier. 6 What should be connected to the Inverting Input (pin 2)? The Inverting Input (pin 2) is where the signal with inverted polarity is applied in the circuit. 7 What should be connected to the Non-Inverting Input (pin 3)? The Non-Inverting Input (pin 3) is where the signal with the same polarity as the output is applied in the circuit. 8 What is the purpose of the Output pin (pin 5)? The Output pin (pin 5) provides the amplified version of the input signal based on the operational amplifier’s gain configuration. 9 What is the V- pin used for in the MC34072DR2G? The V- pin (pin 4) is used to connect the negative power supply rail to provide the necessary voltage for the op-amp to function. 10 What is the V+ pin used for in the MC34072DR2G? The V+ pin (pin 6) connects to the positive power supply rail to power the operational amplifier. 11 How do I handle the NC (No Connect) pin (pin 7)? The NC pin (pin 7) does not require any connection in the circuit. It can be left unconnected in most cases. 12 Can the MC34072DR2G be used in a single-supply application? Yes, the MC34072DR2G can be used in a single-supply configuration, with the negative supply pin (V-) connected to ground and the positive supply pin (V+) connected to a single rail. 13 What is the recommended operating voltage range for the MC34072DR2G? The MC34072DR2G operates with a supply voltage between ±3V and ±18V (or 6V to 36V single supply). 14 What is the typical input bias current for the MC34072DR2G? The typical input bias current for the MC34072DR2G is approximately 200nA. 15 Can the MC34072DR2G be used in high-speed applications? While the MC34072DR2G is a precision op-amp, it is not designed for high-speed applications. For such uses, other high-speed op-amps would be better suited. 16 What is the typical offset voltage for the MC34072DR2G? The typical input offset voltage for the MC34072DR2G is around 5mV, which can be adjusted using the offset null pins. 17 How should the MC34072DR2G be connected in a differential amplifier circuit? In a differential amplifier circuit, connect the non-inverting and inverting inputs of the MC34072DR2G to the corresponding input signals, and configure the feedback network accordingly. 18 Is the MC34072DR2G suitable for audio applications? Yes, the MC34072DR2G is suitable for low noise audio applications, as it has a low input noise density and good precision. 19 How can I adjust the MC34072DR2G for zero offset voltage? Use the Offset Null pins (pins 1 and 8) and a potentiometer to adjust the internal offset voltage to zero. 20 What is the maximum output voltage swing of the MC34072DR2G? The MC34072DR2G typically has an output voltage swing from V- + 1.5V to V+ - 1.5V, depending on the load conditions.

Conclusion

The MC34072DR2G is a versatile operational amplifier with a wide range of applications. Its 8-pin SOIC package offers an easy-to-use configuration, with the key functions revolving around precise voltage amplification and offset adjustment.