Jännitteenviittaussirut

Jännitteenviittaussirut, known in English as voltage reference ICs, are electronic components designed to produce a stable and precise voltage that is largely independent of variations in temperature, supply voltage, and load current. This stable reference voltage is crucial for a wide range of analog and mixed-signal circuits, including analog-to-digital converters (ADCs), digital-to-analog converters (DACs), power management systems, and measurement instrumentation.

The core functionality of a jännitteenviittaussiru relies on internal semiconductor structures that exhibit a predictable voltage-current relationship. Common technologies used include Zener diodes, bandgap references, and buried Zener diodes. Zener diodes offer simplicity but can be sensitive to temperature. Bandgap references leverage the temperature-dependent properties of semiconductor junctions to create a voltage that is nearly constant over a wide temperature range. Buried Zener diodes provide excellent stability and noise performance.

These components are characterized by key parameters such as reference voltage accuracy, temperature coefficient, output noise, and supply voltage rejection ratio (SVRR). The temperature coefficient indicates how much the reference voltage changes per degree Celsius of temperature variation. Low temperature coefficients are desirable for applications requiring high precision. SVRR quantifies the chip's ability to reject fluctuations in the supply voltage, ensuring that the reference output remains stable even if the power source is noisy. Jännitteenviittaussirut are available in various packages and output voltage options to suit different application requirements.