ADR421BR-REEL7

The ADR421BR-REEL7 is a member of the low-noise ultralow-power low-dropout (LDO) voltage reference family. It offers exceptional accuracy, extremely low noise, and ultralow-power operation. The device is designed for use in various portable electronic systems, including notebook PCs and other battery-powered products. The device also provides superior temperature stability and low impedance output, making it an ideal choice for applications where low noise, accuracy, or low power draw are critical, such as systems using thin film resistors.

The ADR421BR-REEL7 is a monolithic integrated circuit consisting of an LDO voltage regulator and an internal voltage reference, featuring an adjustable output range of 0.8V to 16V with a typical output current capability of 10mA (2A maximum). It is made using CMOS process technology and is rated to operate over a temperature range of 0°C to 70°C. The device is packaged in a variety of packages, including 8-LDFN (2×2 mm), 8-PDSO (2.5×2.5 mm), 8-LQFP (4×4 mm), and 8-SOP (5×5 mm).

Application Field

The ADR421BR-REEL7 is an ideal choice for a wide variety of precise voltage reference applications such as high-precision, low-power systems, such as data converters, digital consumer electronics, and portable handheld devices. It can also be used in other power-sensitive applications where low-noise low-dropout linear regulation is required. The device represents an optimal solution for any application that requires accurate and reliable voltage reference, such as high-speed I/O interface, embedded processor, and interface IC.

Working Principle

The ADR421BR-REEL7 consists of a small LDO voltage regulator and an internal voltage reference. The internal voltage reference circuit is responsible for setting the voltage level, such as 0.8 to 16V, of the output and the LDO is responsible for regulating the output voltage towards that level. The LDO voltage regulator converts an input voltage, such as 5V, to a stable output voltage using a series of transistors and a resistor. When a load changes, the output is adjusted to maintain a constant output voltage. It also features internal current limiting and thermal shutdown protection.

The ADR421BR-REEL7 provides an extremely low-noise reference voltage with a typical output noise level of 100nV/√Hz. It has an operating temperature range of 0°C to 70°C, which makes it an ideal choice for applications requiring very precise and accurate voltage references. In addition, the device provides very efficient power consumption, with a typical current draw of only 10µA at a typical output voltage of 1.2V.

In conclusion, the ADR421BR-REEL7 is an ideal choice for applications requiring an ultralow-noise, ultralow-power, and accurate voltage reference. It is an ideal solution for applications that require precision and low power consumption, such as embedded processor, high-speed I/O interface, and digital consumer electronics.