The ADR4540ARZ-R7 is an ultra-low-noise, precision voltage reference manufactured by Analog Devices. It is a 4.096V device with a high accuracy of +/- 0.26mV, making it suitable for precision voltage and signal conditioning applications. It has an ultra-low noise of 0.90uV RMS and fast start-up time of 200uS, making it ideal for high accuracy power supplies and digital-to-analog (DAC) converters. The device is rated for an operating temperature range of -40°C to +125°C, allowing it to be used in a variety of applications in extreme temperatures. It also features integrated ESD protection and reverse-polarity protection, making it more resistant to damage from electrical stress and polarity mismatches.