ADR441BRZ Overview

ADR441BRZ is a high-precision, low-noise voltage reference IC from Analog Devices. It belongs to the ADR440/ADR441/ADR443/ADR444/ADR445 XFET® voltage reference family. This series uses ADI's proprietary XFET technology together with temperature curvature correction, which greatly reduces nonlinear output voltage changes over temperature, resulting in very low temperature drift and excellent long-term stability.

Compared with traditional buried Zener voltage references, the ADR441BRZ offers superior noise performance and requires only about 500 mV of supply headroom for stable operation. This makes it well suited for low-power and compact system designs. The device can source up to 10 mA of output current and sink up to −5 mA, meeting the load requirements of many precision analog circuits. In addition, it includes a trim pin that allows fine adjustment of the output voltage within approximately ±0.5% without compromising overall performance.

In terms of packaging and applications, the ADR441BRZ is available in a narrow SOIC package, making it suitable for high-density PCB layouts, and it supports an industrial operating temperature range of −40°C to +125°C. It is widely used in applications that require high voltage reference accuracy and stability.

ADR441BRZ Key Specs

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ADR441BRZ Pinout

Pin1, 8 (DNC): Do Not Connect. Do not connect to these pins.

PIin2 (VIN): Input Voltage Connection.

PIin3, 7 (NIC): Not Internally Connected. These pins are not connected internally.

PIin4 (GND): Ground.

PIin5 (TRIM): Output Voltage Trim.

PIin6 (VOUT): Output Voltage.

ADR441BRZ Features

l  Ultralow noise (0.1 Hz to 10 Hz)

- ADR441: 1.2 µV p-p

l  Superb temperature coefficient

- A grade: 10 ppm/°C

- B grade: 3 ppm/°C

l  Low dropout operation (supply voltage headroom): 500 mV

l  Input range: (VOUT + 500 mV) to 18 V

l  High output source and sink current

l  +10 mA and −5 mA, respectively

l  Wide temperature range: −40°C to +125°C

l  XFET Technology

l  Typical drift: 50ppm/1,000 hours

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ADR441BRZ Circuit

1. Providing a High-Precision Voltage Reference

In the upper-left of the circuit, the ADR441 is powered by a +5 V supply (VIN) and, thanks to its ultra-low-noise XFET architecture, generates a highly stable +2.5 V reference voltage. This +2.5 V is used in two key places: it biases the AD8476 differential amplifier (INN) to ensure proper signal level shifting under single-supply operation, and it also serves as the external reference (REFIN) for the AD7790 16-bit ADC, directly defining the ADC's measurement accuracy and input range.

2. Ensuring Stability Across the Entire Signal Chain

Thermocouple signals are extremely small, typically in the microvolt range, so even minor voltage fluctuations can introduce significant errors. The ADR441's +2.5 V output, together with local decoupling capacitors such as the 0.1 μF capacitor at the REFIN pin, provides a clean and stable voltage reference for the amplifier and precision ADC. This minimizes the impact of supply noise on sampling results, allowing the system to accurately capture the temperature signal processed by the AD8495 and achieve high-resolution, industrial-grade temperature measurement.

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ADR441BRZ Applications

Precision Data Acquisition Systems

The ADR441BRZ features ultra-low temperature drift and high-precision reference voltage, making it ideal for precision data acquisition (DAQ) systems. When measuring small signals such as voltage, current, or temperature, it ensures stable system output and prevents signal distortion, thereby improving overall measurement accuracy and reliability.

High-Resolution Data Converters

In high-resolution ADC or DAC systems, the ADR441BRZ provides a stable, low-noise reference voltage source, ensuring accurate and linear data conversion. It minimizes the impact of quantization errors on the final output, making it suitable for precision instruments and scientific measurement equipment.

Battery-Powered Instrumentation

For portable, battery-powered devices, the ADR441BRZ's low-power characteristics are critical. Its microamp-level quiescent current extends battery life while maintaining high-precision output, making it ideal for handheld measurement tools or field testing equipment.

Portable Medical Instruments

In portable medical devices such as ECG monitors, blood pressure monitors, or blood glucose meters, precise voltage references are essential for accurate sensor signal processing. The ADR441BRZ provides stable reference voltage, ensuring reliable medical data and meeting medical-grade requirements.

Industrial Process Control Systems

Industrial automation and process control systems require high-precision, highly stable reference voltages for accurate control. The ADR441BRZ can be used in sensor interfaces, control modules, and precision signal processing units, ensuring stable and reliable industrial process data.

Precision Instruments

In laboratory or testing equipment such as digital multimeters, oscilloscopes, and pressure gauges, the ADR441BRZ provides a stable voltage reference, reducing system drift and errors, and improving measurement repeatability and accuracy.

Optical Control Circuits

Optical detection and control systems, including photodetectors and laser control modules, require precise voltage to regulate light sources or signal processing circuits. The ADR441BRZ's high accuracy and low noise characteristics enhance the sensitivity and stability of optical systems.

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