Onsemi LM224NG: Datasheet, Application Circuits, and Technical Specifications
The LM224NG from Onsemi is a widely used, industry-standard quad low-power operational amplifier. This IC integrates four independent, high-gain, internally frequency-compensated op-amps on a single monolithic chip, designed to operate from a single power supply over a wide voltage range. Its combination of versatility, reliability, and cost-effectiveness makes it a fundamental component in a vast array of analog circuit designs.
Technical Specifications
The LM224NG is characterized for operation at a wide supply voltage range, from 3V to 32V (or ±1.5V to ±16V in split-supply configurations). Its low supply current drain is virtually independent of the magnitude of the supply voltage, making it ideal for battery-powered applications. Key specifications include:
Number of Channels: 4
Supply Voltage - Max: 32 V
GBP - Gain Bandwidth Product: 1.1 MHz
SR - Slew Rate: 0.6 V/μs
Vos - Input Offset Voltage: 2 mV
Ib - Input Bias Current: 45 nA
Operating Temperature Range: -40°C to +105°C
Package: 14-Pin PDIP (N)
A critical feature of the LM224NG is its input common-mode voltage range that includes ground, allowing the amplifier to sense signals at the negative rail. This is particularly advantageous in single-supply operations where signals are referenced to ground.
Application Circuits
The LM224NG's flexibility enables its use in countless circuit configurations. Some of the most common applications include:
1. Active Filters: Its stable bandwidth makes it suitable for building Sallen-Key or Multiple Feedback (MFB) low-pass, high-pass, and band-pass filter circuits for signal conditioning.
2. Transducer Amplifiers: It is perfectly suited for amplifying small signals from sensors and transducers, such as thermocouples, photodiodes, or pressure sensors, especially in single-supply systems.
3. Voltage Followers (Buffers): Each op-amp can be configured as a unity-gain buffer to isolate stages and prevent loading between high-impedance sources and low-impedance loads.
4. Comparators: While not as fast as dedicated comparator ICs, the LM224NG can be used in non-critical comparison applications where a output swings between the supply rails.
5. Summing and Differential Amplifiers: It can perform mathematical operations like addition and subtraction of analog signals, a core function in analog computing and audio mixing.
Datasheet Importance
The official Onsemi LM224NG datasheet is an indispensable resource for any design engineer. It provides absolute maximum ratings, recommended operating conditions, and detailed electrical characteristics that are crucial for ensuring the device operates within its safe area. Furthermore, it includes extensive application notes, typical performance characteristics graphs, and detailed logic diagrams that are essential for robust and reliable circuit design.
ICGOODFIND: The Onsemi LM224NG stands as a testament to timeless analog design. Its rugged construction, wide operating voltage, and quad packaging offer exceptional utility and value. For engineers designing industrial control systems, automotive electronics, power supply monitoring, or consumer appliances, the LM224NG remains a go-to solution for analog signal processing tasks where precision is important but ultra-high performance is not critical. It successfully bridges the gap between ancient bipolar op-amps and modern CMOS alternatives.
Keywords:
Operational Amplifier
Single-Supply
Quad Op-Amp
Wide Voltage Range
Signal Conditioning
