LM2904DGKR Detailed explanation of pin function specifications and circuit principle instructions

The part number " LM2904 DGKR" belongs to Texas Instruments (TI), a well-known global semiconductor company.

The LM2904DGKR is an operational amplifier (op-amp), typically used in analog circuit applications for signal amplification. It comes in a SOIC-8 (Small Outline Integrated Circuit - 8 pins) package.

Pin Function Specifications of LM2904DGKR (SOIC-8 Package)

Below is the pinout and detailed function of each pin of the LM2904DGKR. Since this op-amp has 8 pins, I will provide a detailed explanation of each:

Pin Number Pin Name Pin Function 1 Offset Null This pin is used to adjust the output offset voltage. It is typically used for precision applications where eliminating offset is crucial. In most cases, this pin is not connected directly in simple designs. 2 Inverting Input (V-) This is the inverting input of the operational amplifier. A negative voltage relative to the non-inverting input is applied to this pin to generate an inverted output signal. 3 Non-Inverting Input (V+) This is the non-inverting input of the operational amplifier. A positive voltage relative to the inverting input is applied to this pin to generate a non-inverted output signal. 4 V- (Negative Supply) This pin connects to the negative power supply voltage (e.g., -15V) in a dual-supply configuration. It is the ground or negative terminal for the power supply. 5 Offset Null This is another pin used for offset voltage adjustment. It is usually tied to a potentiometer that helps fine-tune the input offset. 6 Output This pin delivers the output signal of the operational amplifier. The voltage at this pin depends on the difference between the input pins and the feedback configuration. 7 V+ (Positive Supply) This pin connects to the positive power supply voltage (e.g., +15V) in a dual-supply configuration. It provides the positive terminal for the power supply. 8 NC (No Connection) This pin is not connected to any internal circuit. It can be left unconnected in most applications. Some versions of this op-amp might have internal connections here, but it typically serves as an unused or reserved pin.

Detailed Circuit Principle Instructions

LM2904DGKR is a dual op-amp integrated circuit that contains two independent, high-gain, internally frequency-compensated operational amplifiers. These amplifiers are designed to be used for a wide range of analog applications such as signal amplification, filtering, and buffering.

Basic Circuit: Voltage Supply: The LM2904DGKR typically operates with a dual supply (e.g., ±5V to ±18V). The positive supply voltage is connected to pin 7, and the negative supply voltage is connected to pin 4. Input Signal: The input signal is applied to either the non-inverting or inverting input pins (pins 2 and 3). Feedback Loop: A feedback resistor network is commonly used to configure the amplifier for specific gain requirements. Output Signal: The output is taken from pin 6, which produces a signal that is either amplified in phase (non-inverting mode) or out of phase (inverting mode), depending on the input configuration.

FAQ for LM2904DGKR (Questions & Answers)

Q1: What is the package type for LM2904DGKR? A1: The LM2904DGKR comes in a SOIC-8 (Small Outline Integrated Circuit) package, which has 8 pins.

Q2: What is the voltage range for the LM2904DGKR? A2: The LM2904DGKR operates with a dual power supply, with a typical voltage range from ±3V to ±18V.

Q3: Can the LM2904DGKR be used in single-supply applications? A3: Yes, the LM2904DGKR can be used in single-supply applications with an input voltage range from 0V to V+.

Q4: What is the function of pin 1 (Offset Null)? A4: Pin 1 is used for offset voltage adjustment, allowing you to remove any inherent offset voltage from the output.

Q5: How do I use pin 5 (Offset Null)? A5: Pin 5 is another offset null pin and is typically connected to a potentiometer for precise adjustment of the amplifier’s offset voltage.

Q6: What is the input impedance of the LM2904DGKR? A6: The input impedance of the LM2904DGKR is very high, typically 10^6 Ω or higher, making it suitable for buffering applications.

Q7: What is the output impedance of LM2904DGKR? A7: The output impedance is typically very low, around 100Ω, allowing the device to drive low impedance loads.

Q8: Can I use the LM2904DGKR in high-frequency applications? A8: The LM2904DGKR is internally compensated for frequency response, but it has a limited bandwidth of around 1 MHz, making it suitable for low to moderate-frequency applications.

Q9: Is the LM2904DGKR suitable for precision analog circuits? A9: Yes, it is designed for precision applications, and the offset null pins provide a way to fine-tune the performance.

Q10: What are typical applications for the LM2904DGKR? A10: Typical applications include signal amplification, filtering, buffering, and instrumentation amplifiers.

Q11: How should I handle the negative supply (pin 4)? A11: Pin 4 should be connected to the negative terminal of the power supply, usually in dual-supply configurations (e.g., -15V).

Q12: Can the LM2904DGKR operate with a single supply? A12: Yes, the LM2904DGKR can operate with a single supply, provided the input voltage does not go below ground.

Q13: What happens if I leave the NC pin (pin 8) unconnected? A13: The NC pin can be left unconnected as it is not used in most applications and has no internal connection.

Q14: What is the gain bandwidth product of LM2904DGKR? A14: The gain-bandwidth product is around 1 MHz, meaning the amplifier can provide a gain of 1 with a bandwidth of up to 1 MHz.

Q15: How is the output signal controlled? A15: The output signal is controlled by the differential input voltage applied between pins 2 and 3, with feedback configuration.

Q16: What is the maximum output voltage swing of the LM2904DGKR? A16: The output voltage swing is typically V- + 1V to V+ - 1V under standard conditions.

Q17: Can I use the LM2904DGKR for audio amplification? A17: Yes, the LM2904DGKR can be used in audio amplification applications, though it is not optimized for high-frequency audio signals.

Q18: What is the typical power consumption of the LM2904DGKR? A18: The typical quiescent current is about 200 μA, making it suitable for low-power applications.

Q19: Can I use the LM2904DGKR for filtering? A19: Yes, the LM2904DGKR can be used in active filter designs, such as low-pass, high-pass, and band-pass filters .

Q20: Is the LM2904DGKR suitable for battery-powered devices? A20: Yes, with its low power consumption and wide input voltage range, the LM2904DGKR is suitable for battery-powered applications.

This explanation should cover the requested details for the LM2904DGKR. If you need more in-depth information on any specific area or further clarification, feel free to ask!