on October 14th 5,130

LM3900 Norton Operational Amplifier: Pinout, Circuit Applications, and Datasheet

The LM3900 is a unique quad operational amplifier that features a Norton current-differencing architecture, setting it apart from conventional op-amps. Designed for efficient operation across a wide range of temperatures and voltages, the LM3900 is versatile enough to handle various signal-processing tasks in audio, sensor, and instrumentation applications. Its expanded frequency response and robust internal circuitry make it a reliable choice for electronics enthusiasts and professionals alike. In this article, we will explore the LM3900's technical specifications, pin configuration, and practical applications, highlighting how mastering its capabilities can enhance your electronic designs.

Catalog

Overview of LM3900

The LM3900 is a versatile quad amplifier array designed for efficient functioning across a wide voltage spectrum and multiple supply configurations, including single and split supplies. Its design minimizes current drain regardless of supply voltage, ensuring a substantial output voltage swing and notable bandwidth. Each amplifier in this array is frequency-compensated and exhibits high gain, making it suitable for various applications.

One of the LM3900's defining features is its adaptability to different voltage ranges. This adaptability makes it requisite in scenarios where supply voltages fluctuate significantly. Various fields have noted its consistent performance, even under unstable voltage conditions, which proves beneficial in dynamic environments. This attribute ensures that the LM3900 remains dependable in applications demanding precision and stability.

Each amplifier within the LM3900 array is frequency-compensated, helping to stabilize the amplifiers and prevent oscillations across varying frequencies. The high gain aspect guarantees the amplifier's ability to boost weak signals to more potent levels. In the worlds of audio, communications, and signal processing, you can find this high-gain capability to be mostly valuable. Practical applications reveal that this high gain remains resilient, even in taxing environments where maintaining signal integrity is serious.

LM3900 Pin Configuration

Pin Number	Pin Name	Description
1	1IN+	Non-Inverting Input 1
2	2IN+	Non-Inverting Input 2
3	2IN-	Inverting Input 2
4	2OUT	Output Pin 2
5	1OUT	Output Pin 1
6	1IN-	Inverting Input 1
7	GND	Ground Pin
8	3IN-	Inverting Input 3
9	3OUT	Output Pin 3
10	4OUT	Output Pin 4
11	4IN-	Inverting Input 4
12	4IN+	Non-Inverting Input 4
13	3IN+	Non-Inverting Input 3
14	VCC	Positive Supply Voltage

LM3900 CAD Details

Schematic Symbol

PCB Footprint

3D Representation

Key Attributes of the LM3900

Versatile Power Supply Accommodations

The LM3900 supports an expansive supply voltage range, spanning from 4 VDC to 32 VDC or ±2 VDC to ±16 VDC. This flexibility is invaluable across various applications, accommodating both low-voltage and high-voltage systems. You can often face varied power supply scenarios, making the LM3900 a versatile choice for seamless integration into diverse environments without major redesign needs. For companies, this adaptability simplifies product lines, minimizing the need for multiple discrete components and easing logistical burdens.

Stable Supply Current

Maintaining a consistent supply current within its operating voltage range, the LM3900 excels in power-sensitive applications like battery-operated devices. Its predictable current consumption can significantly extend battery life. This stability aids in thermal management and overall circuit steadiness, used during the design phase to prevent operational issues.

Minimal Input Bias Current

The LM3900 boasts a low input bias current of 30 nA, making it suitable for high-impedance signal sources and ensuring precise signal processing with minimal loading. This attribute is especially beneficial in sensor interfacing, where accurate measurements are required. You can often seek components with low input bias currents to reduce errors in low-current applications, thus enhancing product reliability and accuracy.

Amplification Efficiency with High Open-Loop Gain

With a high open-loop gain of 70 dB, the LM3900 effectively amplifies weak signals, making it ideal for analog signal processing tasks such as audio amplification and sensor data conditioning. This gain ensures the desired amplification with minimal distortion. In practical applications, high open-loop gain provides design versatility, allowing for the creation of robust signal conditioning circuits that maintain fidelity and performance.

High-Speed Signal Processing with Wide Bandwidth

The LM3900 features a wide bandwidth of 2.5 MHz at unity gain, supporting high-speed signal processing needs. This ensures the amplifier efficiently handles fast transient signals without substantial loss or phase shift, major in telecommunications and high-frequency applications. You value such bandwidth capabilities to ensure optimal performance in dynamic signal environments.

Output Voltage Swing

The LM3900's ability to produce a substantial output voltage swing enables it to drive loads with considerable voltage requirements, broadening its compatibility with various components and circuits. This capacity is mostly advantageous for driving actuators or high-voltage devices, simplifying circuit design and improving overall efficiency.

Built-In Stability and Protection

Internal frequency compensation within the LM3900 stabilizes its performance across varied frequencies, mitigating oscillatory tendencies. When combined with inherent short-circuit protection, these features safeguard the amplifier from accidental damage due to circuit faults, enhancing durability and reliability. These integrated protections allow for compact and resilient designs, reflecting a profound understanding of common circuit failures.

Ease of Replacement with Interchangeability

The LM3900 is interchangeable with National Semiconductor's LM2900 and LM3900 models, providing design flexibility and ease of replacement. This interchangeability streamlines the procurement process and supports robust inventory management, reducing production downtime. Utilizing interoperable components fosters efficient maintenance and updates, as replacements can be seamlessly integrated without extensive revalidation.

Technical Specifications

Type	Parameter
Lifecycle Status	ACTIVE (Last Updated: 2 days ago)
Factory Lead Time	6 Weeks
Contact Plating	Gold
Mount	Through Hole
Mounting Type	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)
Number of Pins	14
Operating Temperature	0°C~70°C
Packaging	Tube
JESD-609 Code	e4
Pbfree Code	Yes
Part Status	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Number of Terminations	14
ECCN Code	EAR99
Max Power Dissipation	1.15W
Terminal Position	DUAL
Number of Functions	4
Supply Voltage	15V
Base Part Number	LM3900
Pin Count	14
Operating Supply Voltage	5V
Number of Channels	4
Operating Supply Current	6.2mA
Nominal Supply Current	10mA
Power Dissipation	1.15W
Max Supply Current	10mA
Slew Rate	20V/μs
Architecture	Voltage-Feedback
Amplifier Type	General Purpose
Current - Input Bias	30nA
Voltage - Supply, Single/Dual (±)	4.5V32V ±2.2V16V
Output Current per Channel	10mA
Bandwidth	2.5MHz
Unity Gain Bandwidth	2500 kHz
Voltage Gain	68.94dB
Average Bias Current-Max (IIB)	0.2μA
Low-Offset	No
Frequency Compensation	Yes
Supply Voltage Limit-Max	32V
Low-Bias	No
Micropower	No
Bias Current-Max (IIB) @25°C	0.2μA
Programmable Power	No
Dual Supply Voltage	3V
Dimensions (Height)	5.08mm
Dimensions (Length)	19.3mm
Dimensions (Width)	6.35mm
Thickness	3.9mm
REACH SVHC	No SVHC
Radiation Hardening	No
RoHS Status	ROHS3 Compliant
Lead Free	Lead Free

Comparable Parts

Part Number	Manufacturer	Package / Case	Number of Pins	Slew Rate	Supply Voltage	Operating Supply Current	Technology	Pbfree Code	Number of Functions	View Compare
LM3900N	Texas Instruments	14-DIP (0.300, 7.62mm)	14	20 V/μs	15 V	6.2 mA	BIPOLAR	Yes	4	LM3900N vs LM2900N
LM2900N	Texas Instruments	14-DIP (0.300, 7.62mm)	14	20 V/μs	15 V	6.2 mA	BIPOLAR	Yes	4	LM2900N vs LM3900N
LM224NG	ON Semiconductor	14-DIP (0.300, 7.62mm)	14	0.6 V/μs	5 V	1.4 mA	BIPOLAR	Yes	4	LM3900N vs LM224NG
LM3900NE4	Texas Instruments	PDIP	14	20 V/μs	15 V	6.2 mA	BIPOLAR	Yes	4	LM3900N vs LM3900NE4
LM2900NE4	Texas Instruments	PDIP	14	20 V/μs	15 V	6.2 mA	BIPOLAR	Yes	4	LM3900N vs LM2900NE4

LM3900 Individual Amplifier Symbol

LM3900 Amplifier Schematic

Application Insights for the LM3900

Norton amplifiers, also known as current-differencing amplifiers, are highly versatile in various general-purpose applications necessitating single-supply operation. By exploiting the inverting input’s diverging current via the external feedback resistor, these amplifiers generate the output voltage. Moreover, they efficiently manage signal levels near or below ground using common-mode current biasing. To protect against negative inputs, internal transistors act as clamps. An external network constrains the current to about –100 µA under high-temperature conditions. Proper circuit arrangement and input series resistors are required to prevent noise-induced oscillations. Limiting peak current helps maintain system integrity.

Even though the device can endure currents up to 20 mA, extended exposure to high currents can degrade mirror gain, especially at elevated temperatures. This degradation highlights the necessity of strategic thermal management within circuit design.

Voltage-Controlled Current Source

Voltage-Controlled Current Sink

Circuit Diagram of LM3900

An audio mixer employing the LM3900 quad amplifier adeptly manages multiple audio inputs, showcasing notable adaptability and distinction. This specific setup presents four distinct channels: two microphone inputs intricately designed for capturing delicate sound differences, and two direct line inputs accommodating various audio sources. Additional circuits can be integrated in parallel, thus permitting an expansion in the number of inputs and adding further flexibility to the system. Each input is connected to the inverting terminals of the LM3900 amplifiers, where individual signals are amplified before being seamlessly combined at the output. The output, linked to a single line with a resistance of up to 680K, results in a mixed audio output with minimal noise interference. To ensure stability, decoupling capacitors are strategically placed in each channel input (C1-C4) and at the final output (C5).

Integrating a high-quality audio mixer into a functional environment involves meticulous fine-tuning and addressing various design subtleties. Creating a low-noise environment, for instance, often necessitates effective grounding and isolation of high-impedance nodes

Multi-Channel Audio Mixer Technical Specifications

This audio mixer is distinguished by several attributes.

• It operates across a wide supply voltage range, from 4V to 32V, making it versatile for various power situations.

• The compatibility with dual voltage supplies, ranging from ±2.2V to ±16V, offers considerable flexibility.

• The low input bias current of merely 30 nA ensures high input impedance, thereby reducing signal loading.

• Possessing a notable high open-loop gain of 70 dB, it provides robust signal amplification capable of handling dynamic audio ranges.

• Designed with output short-circuit protection, it prevents damage due to accidental short circuits, bolstering reliability.

• Achieving low distortion and a good frequency response is facilitated by a simple design, making it indispensable for high-fidelity audio applications.

LM3900 Uses

AC Amplifiers

The versatility of the LM3900 operational amplifier shines in AC signal amplification. Its unique architecture achieves substantial gain while minimizing noise and distortion. This makes it apt for both audio and radio frequency circuits. Its broad frequency response enhances high-fidelity audio applications, ensuring sound reproduction is clear and accurate. They highlight its reliability in delivering consistent performance across varying audio environments, required for both studio recordings and live sound setups.

RC Active Filters

In the design of RC active filters, the LM3900's capability to handle a broad range of frequencies and maintain stability under varying load conditions stands out. These filters are adept at eliminating undesired frequencies from signals in telecommunications or audio processing. Utilization of the LM3900 in low-pass, high-pass, band-pass, or band-stop configurations yields precise control over filter characteristics. This exact control benefits applications requiring high selectivity and minimal signal degradation.

Triangle, Square, and Pulse Waveform Generators

For generating triangle, square, and pulse waveforms, the LM3900 proves invaluable. It produces stable and precise waveforms suitable for various electronic applications, including signal processing and laboratory function generators. Its robust design allows for reliable waveform generation with minimal drift, dangerous for consistent experimental results and device testing. You can often use the LM3900 for its ability to deliver predictable and reproducible outcomes in experimental electronics.

Tachometers

The LM3900 plays a major role in developing tachometers, devices used to measure rotational speeds. Its sensitivity and rapid response time make it ideal for translating rotational speed into a readable electrical signal. Automotive production and industrial machinery emphasize the importance of accurate speed measurement for performance monitoring and safety assurance. You can frequently commend the LM3900 for its reliability in harsh and varying environmental conditions, contributing to its widespread use in serious speed monitoring systems.

Low-Speed and High-Voltage Digital Logic Gates

In digital electronics, the LM3900 stands out as a low-speed, high-voltage digital logic gate. This characteristic is beneficial in scenarios where conventional low-voltage logic gates underperform, mainly in high-power applications or environments with substantial electrical noise. You can tell that the LM3900 provides a robust solution for logic operations, ensuring system integrity and stability. The device's flexibility and durability in handling high-voltage signals without compromising performance are frequently noted assets in managing complex electronic systems.

LM3900 Packaging

Manufacturer of LM3900

Texas Instruments, with its headquarters in Dallas, Texas, stands out as a prominent designer and manufacturer of semiconductors and integrated circuits catering to global markets. Among the top ten semiconductor manufacturers, Texas Instruments places a remarkable focus on analog chips and embedded processors, forming the bulk of its revenue stream.

Founded in 1930 under the name Geophysical Service Incorporated, Texas Instruments originally concentrated on seismic exploration technology. Shifted by the tides of time, the company later moved into defense electronics before ultimately pioneering the semiconductor industry in the 1950s. In the 1980s, a deliberate pivot to analog and embedded processors solidified its reputation and competitive stance within the industry.

Texas Instruments excels in analog chips, which convert actual signals like sound, temperature, and pressure into digital data for electronic devices. The company also boasts expertise in embedded processors, used in applications ranging from automotive systems to industrial automation.

Datasheet PDF

LM224NG Datasheets:

LM324(A) ,224, 2902(V), NCV2902.pdf

Frequently Asked Questions [FAQ]

1. What is the LM3900?

The LM3900 integrates four dual-input, internally compensated amplifiers designed for single-supply operation. It offers notable output voltage swings. Featuring a current mirror non-inverting input function, it handles complex amplification tasks efficiently, making it versatile for a range of applications.

2. What is a Norton op-amp?

A Norton amplifier, also known as a current differencing amplifier, includes two low-impedance current inputs and a single low-impedance voltage output. The output voltage is directly proportional to the difference between the input currents. This design lends itself to applications that demand precise current differencing. These amplifiers provide a reliable solution for specific signal-processing tasks, enhancing the accuracy and efficiency of operations.

3. What is the temperature range for the LM3900?

The operational temperature range for the LM3900 spans from 0 to 70 degrees Celsius. This broad range supports performance stability across various environmental conditions, making it adaptable to different practical scenarios.

4. How many Norton operational amplifiers are integrated into the LM3900?

The LM3900 incorporates four Norton operational amplifiers. This configuration supports complex signal processing applications within a single integrated circuit. The design enhances efficiency, making it suitable for both simple and complex systems.

5. Can the LM3900 operate with split supplies?

Yes, the LM3900 can operate with split supplies. This flexibility allows for tailored power supply configurations, meeting specific circuit needs and ensuring optimal performance under various conditions.

6. How does supply voltage affect the current drain in the LM3900?

The supply voltage has minimal impact on the current drain in the LM3900. This characteristic ensures stable operation and consistent performance, regardless of supply voltage fluctuations. Such stability proves beneficial in actual applications with varying power supply conditions, maintaining reliability and efficiency.