LM4128BMF-1.8

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LM4128BMF-1.8 is a type of voltage reference, part of Power Management and Integrated Circuits or PMIC family. As a voltage reference, the LM4128BMF-1.8 provides a stable reference voltage, usually close to 2.5 volts, and capable of sourcing (producing) or sinking (pulling) current, as well as regulating the voltage supply. This particular voltage reference is based on a monolithic, low-power, low-noise CMOS, and features 1.8V to 6.5V output range, with undervoltage hysteresis and temperature compensation.

Commercial devices are available, with both fixed output and adjustable version. The LM4128BMF-1.8 is fairly easy to assemble and has a variety of packaging options, such as 8-pin MSOP, 8-pin SOIC and 8-pin PDIP. The fixed output version requires just two external resistors to set the reference voltage, while the adjustable version requires a third resistor, with a trimmer option. It is important to use ceramic, high-quality capacitors for optimal performance.

In addition, the LM4128BMF-1.8 features a rail-to-rail output, with a maximum temperature coefficient of 30ppm/°C (typ), and a maximum output current of 250mA. The noise figure is also pretty low, just 25µVpp/V (typ), down from 60µVpp/V when fully loaded. The output impedance is 3 Ohms (max) and the power supply rejection ratio is 82dB (min) at 1kHz. Furthermore, the output impedance is immune to the cable effects, and the output voltage is both stable and consistent across the entire range of supply and load conditions.

The application of the LM4128BMF-1.8 is quite extensive, and it is suitable for a wide variety of components and applications. Optional usage topics include portable devices and peripherals, handheld and vehicle systems, data converters and switching power supplies, notebooks and PCs, and memory cards. This voltage reference is perfect for automatic calibration, calibration and testing systems. It is also ideal for battery-backed and rugged applications, as well as low-voltage analogue and digital systems.

The working principle behind the LM4128BMF-1.8 is pretty simple. The voltage reference takes a given voltage from a source and generates an output current that is proportional to the input voltage. This output current is then combined with the output of the op-amp and the resistor divider to form the reference voltage. The resulting voltage is then used to regulate the output voltage, thus providing a constant and stable reference.

In summary, the LM4128BMF-1.8 is a versatile voltage reference that offers a wide output range, low noise figure and excellent stability. It is a perfect solution for a host of applications, ranging from general low-voltage digital and analogue systems to portable, battery-backed and rugged devices. Its wide operating range, excellent power supply rejection ratio and low noise performance make it a great choice for applications where accuracy, stability and precision are key.

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