LM3900N Quadruple Operational Amplifier: Equivalent, Working Principle and LM3900N vs LM3900DR
19 October 2023
Ⅱ. Symbol and footprint of LM3900N
Ⅲ. Technical parameters of LM3900N
Ⅳ. What are the features of LM3900N?
Ⅴ. Pin configuration of LM3900N
Ⅵ. Circuit and working principle of LM3900N
Ⅶ. LM3900N vs LM3900DR comparison
Ⅸ. What are the applications of LM3900N?
The LM3900N is a general-purpose quad Norton operational amplifier consisting of 4 independent dual-input internally compensated amplifiers designed for operation on a single supply voltage. The device features large output voltage swing and wide bandwidth, and utilizes a current mirror to implement the non-inverting input function. In addition, the LM3900N has an operating temperature range of 0°C to 70 °C, maintaining stable performance over a wide temperature range.
Replacement and equivalent:
• LM2900N
• LM3900D
• High reliability: LM3900N has high reliability and can operate stably in various harsh environments without being affected by external factors. Therefore, it greatly improves the operational stability of the equipment, allowing it to maintain stable operation over a long period of time.
• High precision: It can be used in the signal amplification circuit of medical equipment, which can amplify weak signals, and the amplified signal has high precision, which can meet the high precision requirements of medical equipment.
• Low power consumption: Compared with other electronic components of the same type, LM3900N has lower power consumption and saves energy.
• Wide range of applications: In communication systems, it can perfectly handle complex signal processing tasks. In the field of analog calculators, it can efficiently perform a large number of analog calculations. In addition, it is also widely used in many fields such as power supply control, audio amplifiers, automatic controls, oscillators, voltage comparators, and instrumentation.
As shown above, the LM2900 comes in a 14-pin DIP package and includes four identical op amps. Every op amp has inverting and non-inverting inputs and outputs, which are the basic building blocks of an op amp. The following are the pins and descriptions of the LM3900N.
Pin 1 (1 IN+): Non-Inverting Input of Op-Amp 1
Pin 2 (2 IN+): Non-Inverting Input of Op-Amp 2
Pin 3 (2 IN-): Inverting Input of Op-Amp 2
Pin 4 (2 Output): Output of Op-Amp 2
Pin 5 (1 Output): Output of Op-Amp 1
Pin 6 (1 IN-): Inverting Input of Op-Amp 1
Pin 7 (GND): Ground of Supply Voltage
Pin 8 (3IN-): Inverting Input of Op-Amp 3
Pin 9 (3 OUT): Output of Op-Amp 3
Pin 10 (4 OUT): Output of Op-Amp 4
Pin 11 (4 IN-): Inverting Input of Op-Amp 4
Pin 12 (4 IN+): Non-Inverting Input of Op-Amp 4
Pin 13 (3 IN+): Non-Inverting Input of Op-Amp 3
Pin 14 (VCC): VCC of Supply
LM3900N uses a three-stage amplifier circuit, including input stage, intermediate stage and output stage. The input stage uses a differential amplifier circuit, which can effectively suppress zero-point drift; the intermediate stage is a common-emitter amplifier circuit, which can significantly increase the voltage gain; the output stage is a complementary symmetrical amplifier circuit, which can significantly reduce the output resistance and improve the load capacity. The overall circuit design ensures low noise, low distortion, high performance and high stability.
The following compares the differences between the LM3900N and LM3900DR.
When debugging LM3900N, we need to pay attention to the following points:
1. Check whether each pin is connected correctly;
2. Check step by step whether the voltage gain of each stage of the amplifier is as expected;
3. Check whether the power supply voltage is within the normal range;
4. Measure whether the amplitude and frequency of the input signal are within the specified range.
In voltage comparators, the LM3900N can be used not only as a differential amplifier, but also as a single-ended input amplifier. Its main application is to compare two voltage signals and output the corresponding voltage or current signal. Its working principle is to determine the voltage level of the input signal by comparing two voltage signals, and convert the comparison result into a corresponding voltage or current signal output.
In the field of power control, LM3900N is an excellent PWM controller. By adjusting the duty cycle, it can achieve precise output voltage stability control.
In audio amplifiers, the LM3900N can be used as an input stage, output stage or power amplifier. Its low noise and excellent frequency response make it more accurate and realistic in the audio signal amplification process.
Among signal generators and oscillators, the LM3900N can achieve signal outputs of different frequencies and waveforms through different circuit configurations. By using different resistors, capacitors and other components, they can be connected to different circuits to achieve the output of different types of signals. For example, using a simple RC circuit, waveforms such as square waves, triangle waves, and sawtooth waves can be generated. By adding some other components, such as varactor diodes, complex waveforms such as frequency modulated waves and phase modulated waves can be generated.
In addition to above, the LM3900N can also be used as a comparator. It can accurately compare the magnitude of two input signals and output corresponding logic levels based on the comparison results.
Frequently Asked Questions
1. What is the LM3900N?
The LM3900N is a quad Norton operational amplifier. It contains four Norton amplifiers on a single chip, making it suitable for a wide range of analog circuit applications.
2. What is the equivalent of LM3900N?
You can replace the LM3900N with the LM2900N, LM3900D or LM3900NG4.
3. What is the operating temperature range of LM3900N?
The operating temperature of LM3900N ranges from 0°C to 70 °C.
4. What are some common applications of the LM3900N?
The LM3900N can be used in applications such as current-to-voltage converters, current amplifiers, active filters, and various analog signal processing tasks.
