REF2940

The REF2940 is a precision, low-dropout voltage reference IC manufactured by Texas Instruments, designed for high-stability applications requiring accurate and reliable output voltages. It offers a fixed output voltage of 4.096 V with a typical initial accuracy of ±0.1%, ensuring minimal deviation from the nominal value under standard operating conditions. The device operates with a dropout voltage as low as 50 mV at full load, enabling efficient operation even when input voltage is closely matched to the output level. This voltage reference features excellent line regulation (typically 1 ppm/V) and load regulation (typically 10 ppm/mA), which contribute to its stability across varying input voltages and load currents. Its low temperature coefficient—typically 2 ppm/°C—ensures minimal drift over a wide temperature range from –40°C to +125°C, making it suitable for industrial and automotive environments where thermal variations are common. Additionally, the REF2940 provides low output noise (3 μV RMS in the 10 Hz to 10 kHz band) and high power supply rejection ratio (PSRR > 80 dB at 1 kHz), enhancing performance in noisy or unstable power environments. The device includes an integrated enable pin that allows for shutdown mode operation, reducing quiescent current to less than 10 μA, thereby improving power efficiency in battery-powered or portable systems. It also features short-circuit protection and thermal shutdown mechanisms, offering robustness against fault conditions without compromising long-term reliability. With a maximum quiescent current of 1.2 mA at full load, it balances performance and power consumption effectively. Common applications include data acquisition systems, precision analog circuits, sensor interfaces, and calibration references in medical instruments, industrial control systems, and test equipment. Its compatibility with both single-supply and dual-supply configurations makes it versatile for use in mixed-signal designs. The REF2940 is available in a compact SO-8 package, facilitating easy integration into space-constrained PCB layouts while maintaining thermal and electrical performance.