LM4140BCM-4.1

LM4140BCM-4.1 is a three terminal adjustable Micropower Voltage Reference. It is often used for voltage reference applications in analog-to-digital converters, comparators, and instrumentation amplifiers. The device operates from a 1.2V to 5.5V supply and is adjustable from 0.1V to 4.0V with an output voltage accuracy of ±2.5mV and an offset voltage accuracy of ±2mV. It has excellent temperature stability, low power consumption and a wide input voltage range, making it ideal for many low power, low voltage applications.

Applications

The LM4140BCM-4.1 is derived from the LM4140 series of voltage references and offers extremely low power consumption, making it ideal for portable and low power applications which require compact, reliable and accurate voltage references. It offers a wide range of applications including:

• Analog-to-Digital (A/D) Converters
• Comparators
• Instrumentation Amplifiers
• Battery Maintenance
• Battery Charging
• Data Converters
• Thermocouple Temperature Measurement
• Passive Probes

Working Principle

The LM4140BCM-4.1 uses a bandgap voltage reference to produce a highly accurate reference voltage output. A bandgap reference works by using two active elements – an n-type transistor, and a p-type transistor. When operating in the presence of a current source, both of these transistors produce a voltage drop in proportion to the current input that maintains the base-emitter junction. The two transistors create a voltage difference between their emitters that is independent from the voltage applied to the current source. The LM4140BCM-4.1 accurately monitors the current input and adjusts the internal support circuitry so that the output is precisely maintained at the required voltage value.

The LM4140BCM-4.1 provides a very low noise output, with an output voltage accuracy of ±2.5mV and an offset voltage accuracy of ±2mV for any load voltage from 0.1V to 4.0V. Its high precision is maintained over the entire operating temperature range (-40°C to 125°C) and supply voltage range (1.2V to 5.5V).

Conclusion

The LM4140BCM-4.1 is a three terminal adjustable micropower voltage reference, enabling reliable and accurate voltage reference applications in A/D converters, comparators and instrumentation amplifiers. It offers extremely low power consumption, wide range of applications and wide input voltage range, plus excellent temperature stability and output voltage accuracy. The device is ideal for many low power and low voltage applications.