LM258DT

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LM258DT Application Field and Working Principle

LM258DT is a low-noise dual operational amplifier (op-amp) with excellent offset voltage, bias current, and common-mode input voltage range performance. It combines two independent op-amps in the 8-lead PDIP package, making it suitable for use in precision analog applications such as instrumentation and signal conditioning. This operational amplifier is capable of driving loads in excess of 100mA applied to the output without experiencing any major distortion due to the high slew rate and wide bandwidth.

Application Field

LM258DT is a dual op-amp best suited for precision analog circuitry applications, such as analog signal conditioning, instrumentation and measurements. It can be used to implement precision filters, low-noise voltage buffers, current sources/sinks, differential amplifiers, logarithmic and antilogarithmic amplifiers, automatic gain control and a variety of other routinely used functions. The device is ideal for general-purpose analog signal conditioning, especially when high accuracy and low-noise performance are critical. It is fully compatible with most digital systems, allowing designers to easily integrate it with microprocessors, memory devices, A-D and D-A converters and other logic systems.

Working Principle

The LM258DT is based upon two independent op-amps in one 8-lead PDIP package. Each op-amp includes a pair of input terminals and a single output terminal. The output state of one op-amp is independent from the other and the two can operate in a non-interacting, or in a tracking or differential mode. Each op-amp consists of two transconductance amplifiers in series connection with gain selectable by a summing resistor. Open loop gains are much greater than 100 000, with unity gains typically occurring at 10 volts. Power supply ranges are 10 to 30 volts DC. A typical application is a non-inverting amplifier stage, where input and output signals may swing over a wide range, up to the supply levels. Inputs and outputs are usually more sensitive to each other than with true direct coupled operational amplifiers.

Features and Benefits

The LM258DT provides several features and benefits that make it stand out from similar op-amps:

• Low noise performance allows it to be used in applications where precision and low-noise performance is important.
• High dc gain allows for precise measurements.
• Wide common-mode input voltage range allows for maximum flexibility.
• Can be used in a non-interacting, or tracking and differential modes.
• Compact 8-lead PDIP package provides increased mounting density.

Conclusion

The LM258DT is a dual op-amp with excellent offset voltage, bias current, and common-mode input voltage range performance. It combines two independent op-amps in the 8-lead PDIP package, making it suitable for use in precision analog applications such as instrumentation and signal conditioning. This operational amplifier is capable of driving loads in excess of 100mA and provides several features, including low noise performance and high dc gain, that make it an ideal choice for general-purpose analog signal conditioning.

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