Overview
The ADR445ARMZ, from Analog Devices (ADI), is an ultra-low noise, low dropout (LDO) XFET® precision voltage reference that provides a stable 5.0V reference output . It is designed for high-precision data acquisition, high-resolution data conversion, precision instruments, industrial process control, and portable measurement devices. Utilizing ADI’s XFET® technology and temperature drift curvature correction technology, this device reduces nonlinear errors caused by temperature variations in the output voltage, providing a stable reference voltage in precision analog signal chains.
The ADR445ARMZ belongs to the ADR440/ADR441/ADR443/ADR444/ADR445 series of precision voltage references, with the ADR445 being the 5.0V output version. This series features a low dropout margin of approximately 500mV, while providing up to 10mA of output current and sinking up to 5mA, enabling it to directly drive various ADCs, DACs, and other precision analog circuits. The ADR445ARMZ is packaged in an 8-pin MSOP , facilitating high-density PCB design while maintaining low noise and high precision performance.
Core parameters
| Parameter | Value |
| Product Type | Precision voltage reference |
| Output voltage | 5.0V |
| Technical Architecture | XFET® |
| Output noise (0.1Hz～10Hz) | 2.25µV pp |
| Temperature coefficient | Grade A: 10 ppm/°C; Grade B: 3 ppm/°C |
| Low differential pressure margin | 500mV |
| Input voltage range | VOUT + 0.5V to 18V |
| Output source current | Maximum +10mA |
| Output current draw | Maximum −5mA |
| Operating temperature range | -40°C to +125°C |
| Encapsulation type | 8-pin MSOP |
| Model suffix | ARMZ |
| Environmental standards | RoHS compliant |
The above series and model parameters are based on Analog Devices official data.
Features
Ultra-low noise 5V reference output
The ADR445ARMZ is optimized for reference voltage noise in precision analog systems , with a typical noise level of 2.25µV pp in the 0.1Hz to 10Hz range . This low-noise characteristic reduces the impact of the reference source on high-resolution data converters such as ADCs and DACs, helping to maintain overall system measurement accuracy.
XFET® technology reduces temperature drift
This device employs ADI’s proprietary XFET® technology, combined with temperature drift curvature correction, to reduce nonlinear errors in output voltage caused by temperature variations . The series offers Class A and Class B temperature coefficients, with Class B achieving 3 ppm/°C , suitable for precision measurement systems requiring high long-term temperature stability.
Low differential pressure working capability
The ADR445ARMZ has a power margin requirement of approximately 500mV and an input voltage range from VOUT + 500mV to 18V . For the 5V reference output version, the voltage difference requirement between the power rail and the reference voltage can be reduced while meeting the corresponding input conditions, which helps improve system power utilization.
Simultaneously supports source current and sink current.
The device can provide a maximum output source current of +10mA and supports a maximum sink current of -5mA. This bidirectional drive characteristic allows the ADR445ARMZ to adapt to different load conditions and directly serve a variety of precision analog signal chains.
Small MSOP package
The ADR445ARMZ uses an 8-pin MSOP package, enabling precise reference voltage functionality within limited PCB space. ADI’s official documentation also lists SOIC package versions such as the ADR445ARZ, allowing designers to choose the appropriate package based on board space and assembly requirements.
Typical application scenarios
High-precision data acquisition system
The ADR445ARMZ can be used as an external precision reference source for ADCs, providing a low-noise, low-drift 5V reference voltage for high-resolution data acquisition systems.
High-resolution data converter
In high-precision ADC or DAC applications, the stability of the reference voltage directly affects the conversion results. Therefore, the ADR445ARMZ can be used to establish a low-noise, high-temperature-stability reference voltage node.
Precision measuring instruments
Digital multimeters, laboratory instruments, testing equipment, and other precision analog measurement platforms can leverage their low noise and low temperature drift characteristics to improve the reference stability of measurement systems.
Industrial process control
Industrial control systems typically require long-term stable analog measurement and control signals. The ADR445ARMZ can be used for sensor interfaces, ADC front-ends, and controller reference voltage circuits.
Portable instruments
Its low dropout characteristics and precise reference output make it suitable for battery-powered portable measurement devices, enabling a stable reference voltage with limited power margin.
Optical control circuit
ADI’s official documentation also lists optical control circuitry as one of the applications for this series, suitable for precision control systems that require stable analog reference voltages.
Comparative Advantage Analysis
| Performance indicators | ADR445ARMZ | Ordinary voltage reference |
| Output voltage | 5.0V | Depending on the model |
| low frequency noise | 2.25µV pp | Usually higher |
| Temperature stability | excellent | generally |
| Low pressure drop capability | Approximately 500mV | Depends on the architecture |
| Output driver | Source 10mA / Absorb 5mA | Typically lower |
| Precision data conversion applicability | high | generally |
The main advantages of the ADR445ARMZ lie in its low noise, low temperature drift, low dropout voltage, and strong output drive capability . For ADCs, DACs, and precision data acquisition systems, these properties can reduce the impact of the reference voltage itself on system accuracy.
Manufacturer Profile: Analog Devices
Analog Devices (ADI) is a leading global manufacturer of high-performance analog, mixed-signal, and signal processing semiconductors, with products covering multiple areas including data converters, precision amplifiers, power management, interfaces, and industrial signal chains. The ADR445ARMZ belongs to the ADR440/ADR441/ADR443/ADR444/ADR445 series, which utilizes ADI’s XFET® technology and is primarily targeted at high-precision data acquisition, data conversion, and industrial measurement applications.
According to official ADI data, the ADR445ARMZ is a production model in an 8-pin MSOP package, and is also available in tape and reel packages such as ADR445ARMZ-REEL7.
Why choose ADR445ARMZ?
● Provides a stable 5.0V precision reference output
● Low noise of 2.25µV pp from 0.1Hz to 10Hz
● XFET® technology reduces temperature drift nonlinearity
● Low dropout margin of approximately 500mV
● Supports up to +10mA source current and −5mA sink current
● Wide temperature range of −40°C to +125°C
● 8-pin MSOP package for compact PCB designs
● Suitable for high-precision ADCs, DACs, data acquisition, and industrial measurement systems
Frequently Asked Questions (FAQ)
Q1: What is the output voltage of ADR445ARMZ?
The ADR445ARMZ is the 5V version of the ADR445 series, with a nominal output voltage of 5.0V . It is mainly used to provide a stable reference voltage for ADCs, DACs, and precision analog circuits.
Q2: Why is the ADR445ARMZ suitable for high-precision ADCs and DACs?
The conversion accuracy of a data converter can be affected by reference voltage noise and temperature drift. The ADR445ARMZ features low-frequency, low-noise operation and a low temperature coefficient, providing a stable 5V reference source, making it suitable for high-resolution data conversion and precision data acquisition applications.
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