The model " LM2904DR " is part of the Texas Instruments (TI) brand. This specific model is a dual operational amplifier (op-amp) and is commonly used in various applications such as signal amplification, filtering, and active component integration.
Regarding the package type, "LM2904DR" comes in an SOIC-8 (Small Outline Integrated Circuit with 8 pins) package. The detailed pinout function is as follows:
LM2904DR Pin Function Description (SOIC-8 Package)
Pin No. Pin Name Description 1 Offset Null 1 Used for offset voltage adjustment. A potentiometer can be connected here. 2 Inverting Input A The negative input of the first op-amp. Signals applied here are inverted. 3 Non-inverting Input A The positive input of the first op-amp. Signals applied here are non-inverted. 4 V- (Negative Power Supply) Connects to the negative voltage supply, often ground in a single-supply configuration. 5 Output A The output of the first op-amp. Provides the amplified signal. 6 Non-inverting Input B The positive input of the second op-amp. Signals applied here are non-inverted. 7 Inverting Input B The negative input of the second op-amp. Signals applied here are inverted. 8 V+ (Positive Power Supply) Connects to the positive voltage supply.Circuit Principle
The LM2904DR operates as a dual operational amplifier in a single package, allowing users to amplify both positive and negative signals through two independent channels. Each amplifier inside can be configured in various modes like inverting, non-inverting, differential, and integrator circuits depending on the application needs.
The two op-amps are designed for high speed and low power consumption. It is commonly powered by a dual supply (e.g., ±5V), but single-supply configurations (e.g., 5V) are also supported. The output is typically taken from pins 5 and 6 for op-amp A and B, respectively, while the inputs for each op-amp are on pins 2 and 3 for A, and pins 7 and 6 for B.Common FAQ (Frequently Asked Questions)
Q: What is the LM2904DR? A: The LM2904DR is a dual operational amplifier from Texas Instruments, used in various analog signal processing applications.
Q: How many pins does the LM2904DR have? A: The LM2904DR has 8 pins, packaged in an SOIC-8 format.
Q: What is the maximum supply voltage for the LM2904DR? A: The maximum supply voltage is typically ±18V or 36V (single supply).
Q: Can the LM2904DR operate with a single power supply? A: Yes, the LM2904DR can operate with a single supply, typically 5V.
Q: What is the function of pin 4 on the LM2904DR? A: Pin 4 is connected to the negative power supply (V-), typically ground in single-supply configurations.
Q: What is the function of the Offset Null pins (pins 1 and 5)? A: The offset null pins are used to adjust the input offset voltage. A potentiometer can be used to tune the op-amp’s offset.
Q: Can the LM2904DR handle both AC and DC signals? A: Yes, the LM2904DR can amplify both AC and DC signals, depending on how the circuit is designed.
Q: What is the output voltage range for the LM2904DR? A: The output voltage can typically swing close to the power supply rails, but it depends on the load and operating conditions.
Q: How do you connect the non-inverting input in a circuit using LM2904DR? A: The non-inverting input is pin 3 for op-amp A and pin 6 for op-amp B. These inputs should be connected to the signal that you want to amplify without inversion.
Q: What is the role of pin 2 on the LM2904DR? A: Pin 2 is the inverting input for op-amp A. It is used to apply the signal that will be inverted and amplified.
Q: What happens if the offset null pins are left unconnected? A: If the offset null pins are left unconnected, the op-amp may have a small input offset voltage, which could cause errors in amplification.
Q: Can the LM2904DR be used in audio circuits? A: Yes, the LM2904DR can be used in audio amplification circuits, as it provides low noise and wide bandwidth.
Q: Is there any protection against overvoltage on the LM2904DR? A: The LM2904DR has internal protection diodes to handle overvoltage situations, but it’s important not to exceed the absolute maximum ratings.
Q: How do I connect the output of the LM2904DR to a load? A: The output pins (pins 5 and 6) should be connected to the load through an appropriate resistor or directly, depending on the load’s characteristics.
Q: What is the power consumption of the LM2904DR? A: The LM2904DR is a low-power op-amp, consuming typically 200 µA per channel at a supply voltage of 5V.
Q: Can the LM2904DR be used for voltage regulation? A: While the LM2904DR is not specifically designed for voltage regulation, it can be used in feedback loops for voltage regulation applications.
Q: What is the input impedance of the LM2904DR? A: The input impedance is typically high, around 1 MΩ, which makes it suitable for high-impedance sources.
Q: How can I use the LM2904DR in a comparator circuit? A: The LM2904DR can be configured as a comparator by applying appropriate feedback and biasing to the inputs.
Q: What is the temperature range for operating the LM2904DR? A: The LM2904DR operates in a temperature range from -40°C to +85°C.
Q: Can the LM2904DR be used in industrial applications? A: Yes, the LM2904DR can be used in industrial applications, as it offers good reliability and performance in various environments.
The detailed pin functions and their application depend on the specific design and the desired functionality in your circuit.
