LM185H-1.2

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Voltage references provide a reference voltage for voltage references and limits in other circuits. They can produce a stable, precise, and temperature-compensated reference voltage, widely used in electronic measurement and system control. LM185H-1.2 is a popular voltage reference from Texas Instruments. It is a three-terminal adjustable voltage reference in a TO-92 package. The device offers accuracies up to 1.2%, and it is a small and low-cost option for precision voltage references applications.

The LM185H-1.2 operates on a single DC supply. It provides an adjustable output voltage between 0.5V and 4.096V. The reference voltage can be adjusted by an external resistance connected between the ADJ (adjust) terminal and the VOUT (output) terminal. It also has a temperature coefficient of less than 50ppm/°C (Parts Per Million per Degree Celsius). The device includes internal resistance generation. It provides short-circuit protection, reverse-battery protection, current limit protection, and transient protection that protect the device from faults during operation.

The LM185H-1.2 is used in many applications that require precision voltage references. It is used in analog-to-digital converter (ADC) reference circuits, operational amplifier (OP-AMP) reference circuits, and power-supply reference and monitoring circuits. Its wide operating temperature range makes it suitable for outdoor applications, such as mobile phones and battery-powered applications. It can be used to maintain a constant output voltage over varying power-supply and load conditions. It can also be used as a precision current-sense reference for ICs used in industrial motor control applications.

The LM185H-1.2 works by generating an NPN junction with a precalibrated voltage across the collector and the emitter. This voltage is set by the designer using the reference pin connected to the collector of the transistor. The reference pin also acts as a temperature-compensation terminal. The resistors R1 and R2 form a voltage divider, which sets the base voltage of the NPN transistor. The base voltage adjusts the collector-emitter voltage, setting the reference voltage. An external resistor is connected between the output terminal and the adjustable terminal, increasing the voltage above or below the reference voltage.

The LM185H-1.2 is a reliable, cost-effective option for projects that require highly precise, temperature-compensated voltage references. It is a perfect choice for low-cost portable and remote applications where precise voltage references is a must. The device is versatile, small, and easy to use. This makes it an ideal solution for a wide range of projects.

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