The LM2904DGKR is an operational amplifier (op-amp) from the brand Texas Instruments (TI). This specific part number refers to a dual operational amplifier (i.e., two op-amps in one package), and the "DGKR" part of the part number indicates a specific package and configuration of the IC.
Pin Function Specification and Circuit Principle:
The LM2904DGKR is a dual op-amp, which means it contains two independent amplifiers within one IC package. This IC is commonly used in analog applications, such as amplifying weak signals, active filters , voltage followers, and many other analog circuit configurations. Below is a detailed analysis of the pin functions and their specifications.
Package:
The LM2904DGKR comes in a SOIC-8 package (Small Outline Integrated Circuit), which has 8 pins. This is the key package type for this particular op-amp, and it is surface-mounted for ease of use in modern electronics.
Pinout and Functionality:
Pin Number Pin Name Pin Function Description 1 Output 1 Output of the first operational amplifier (Op-Amp 1). The signal at this pin is the result of the amplification of the input signal applied to the non-inverting or inverting input (depending on the configuration). 2 Inverting Input 1 Inverting input for the first op-amp. This is where the input signal is applied when the op-amp is configured in an inverting configuration. The signal polarity at the output will be opposite to the input polarity. 3 Non-inverting Input 1 Non-inverting input for the first op-amp. This is where the input signal is applied when the op-amp is configured in a non-inverting configuration. The signal polarity at the output will be the same as the input polarity. 4 V- (Ground) Negative supply voltage or ground for the op-amp. This pin is connected to the lower supply rail, typically ground in single-supply configurations. 5 Non-inverting Input 2 Non-inverting input for the second op-amp. Similar to pin 3 but for the second amplifier inside the IC. 6 Inverting Input 2 Inverting input for the second op-amp. Similar to pin 2 but for the second amplifier inside the IC. 7 Output 2 Output of the second op-amp (Op-Amp 2). The signal at this pin is the amplified result of the input signal applied to the inverting or non-inverting input (depending on the configuration). 8 V+ (Positive Supply) Positive supply voltage for the op-amp. This pin is connected to the upper supply rail, providing the positive voltage necessary for the proper operation of the op-amps inside the IC.FAQ (Frequently Asked Questions):
1. What is the LM2904DGKR?The LM2904DGKR is a dual operational amplifier IC from Texas Instruments. It contains two independent op-amps in an 8-pin SOIC package.
2. How many pins does the LM2904DGKR have?The LM2904DGKR has 8 pins.
3. What is the supply voltage range for the LM2904DGKR?The supply voltage range for the LM2904DGKR is typically between 3V to 32V (single supply) or ±1.5V to ±16V (dual supply).
4. Can I use the LM2904DGKR with a single supply voltage?Yes, the LM2904DGKR can be used with a single supply voltage, typically between 3V to 32V.
5. What is the maximum output voltage swing for the LM2904DGKR?The output voltage swing of the LM2904DGKR depends on the supply voltage, but it can typically swing from V- to V+ with a small offset, making it ideal for rail-to-rail output configurations.
6. What is the typical gain bandwidth of the LM2904DGKR?The LM2904DGKR typically has a gain-bandwidth product of about 1 MHz.
7. Can the LM2904DGKR be used in low-frequency applications?Yes, the LM2904DGKR is suitable for low-frequency applications such as audio amplification, signal conditioning, and more.
8. What are the typical applications of the LM2904DGKR?Typical applications include signal amplification, active filtering, voltage followers, instrumentation amplifiers, and other analog circuits requiring low-power operation.
9. How does the LM2904DGKR handle power consumption?The LM2904DGKR has a low quiescent current of approximately 1.1 mA per amplifier, making it suitable for battery-powered or energy-efficient designs.
10. What is the input offset voltage of the LM2904DGKR?The input offset voltage of the LM2904DGKR is typically 2 mV.
11. Can the LM2904DGKR operate at high temperatures?Yes, the LM2904DGKR is rated for operation within a temperature range of -40°C to +125°C.
12. What is the maximum output current for the LM2904DGKR?The LM2904DGKR can typically provide an output current of ±10 mA.
13. How does the LM2904DGKR perform in terms of input impedance?The input impedance of the LM2904DGKR is high, typically around 1 MΩ for both inverting and non-inverting inputs.
14. What is the noise performance of the LM2904DGKR?The LM2904DGKR has a typical voltage noise density of about 25 nV/√Hz at 1 kHz, making it suitable for low-noise applications.
15. How should the LM2904DGKR be mounted on a PCB?The LM2904DGKR comes in an 8-pin SOIC package and should be mounted using surface-mount soldering techniques.
16. Does the LM2904DGKR support rail-to-rail operation?Yes, the LM2904DGKR is capable of rail-to-rail output, meaning the output can swing close to the supply rails.
17. Can I use the LM2904DGKR in a voltage comparator configuration?Yes, the LM2904DGKR can be used as a comparator, but it is not ideal for high-speed applications.
18. What is the typical slew rate of the LM2904DGKR?The LM2904DGKR has a typical slew rate of about 0.3 V/μs.
19. Is the LM2904DGKR suitable for high-speed applications?No, the LM2904DGKR is designed for low-speed applications with a relatively low slew rate and bandwidth.
20. How should I use the LM2904DGKR in a voltage follower configuration?In a voltage follower configuration, the non-inverting input should be connected to the signal source, and the output should be connected back to the inverting input. The output will follow the input signal without gain.