LM124D

LM124D Application Field and Working Principle

The LM124D Series is a family of high-performance, single-supply, low power, quad operational amplifiers developed by Texas Instruments. This device consists of four independent, internally frequency compensated high gain operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. The LM124D simplifies designs that would otherwise require two separate power supplies. The voltage range for the power supply can easily cover the range from ±2.5V to ±32V, or a single positive or negative supply of up to 32V.

The LM124D has several features which make it ideal for use in a wide range of applications including instrumentation amps, strain gauge amplifiers, buffered integrators/differentiators, sample and hold circuits and waveform generators. It has a strong input stage yielding very low offset voltage, a gain bandwidth product of 1MHz with a single supply, and has a very high open-loop gain of at least 200V/mV for gains of 10 or more. These features make the LM124D an ideal choice for a variety of applications.

Working Principle of LM124D

The LM124D features a high input impedance of up to 500KΩ, eliminating the need for buffering the inputs. It has excellent gain linearity (1/2LSB) via laser trimming as well as a wide bandwidth of 1 MHz for low current draw (1.5mA per amplifier). The input stage is designed to protect the amplifier from transients on the supply lines. The output stage provides the capability to drive up to 600Ω into a capacitive load of up to 17pF with very low distortion levels.

The output stage can also be easily configured with two equal resistors to make a fully-differential output voltage. The differential output can also be connected directly to an ADC or a digital system to be used as a programmable gain amplifier. The LM124D is a full-featured amplifier with a low power dissipation of 1.6mA at ±25V and a wide operating temperature range of -40℃ to +85℃.

Applications of LM124D

Due to its feature set, the LM124D is a popular choice for use in many applications. Its low power, wide temperature range, and diversity of configurability make it ideal for use as an instrumentation or data acquisition amplifier in medical, industrial, and consumer applications. The LM124D is especially suited for use in data acquisition systems such as strain gauges, pressure transducers, and temperature sensors as it provides high gain, low offset voltage, and fast frequency response. It is also very useful in power monitoring and control applications, as it is capable of driving a wide range of loads.

The LM124D can also be used as a voltage and current feedback amplifier, as it provides excellent bandwidth of 1 MHz, low offset voltage and low power consumption. Moreover, it can also be used in audio applications such as anti-aliasing filtering and signal to noise ratio improvement. The low power dissipation of the LM124D allows it to be used in battery operated portable applications as well as computer and telecommunications systems.

Conclusion

The LM124D is an ideal choice for high performance, low power, quad, operational amplifiers that operate from a single power supply over a wide range of voltages. The device features a high input impedance, excellent linearity and bandwidth, and a wide temperature range, making it suitable for a diverse range of applications in medical, industrial, consumer and audio applications. The low power dissipation of 1.6mA at ±25V makes the LM124D ideal for use in battery-powered portable applications.