High Temperature, Low Drift, Micropower, 2.5V Reference

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Part Details
Part Models 3
1ku List Price Starting From $85.92
  • Download ADR225-KGD-DIE Data Sheet. Available as Known Good Die and fully guaranteed in data sheet specifications
  • Extreme high temperature operation
    • −40°C to +210°C, 8-lead FLATPACK
    • −40°C to +175°C, 8-lead SOIC
  • Temperature coefficient
    • 40 ppm/°C, 8-lead FLATPACK
    • 10 ppm/°C, 8-lead SOIC
  • High output current: 10 mA
  • Low supply current: 50 µA maximum
  • Initial accuracy: ±0.4% (±10 mV maximum), 8-lead SOIC
  • Low dropout voltage
  • Wide supply range: 3.3 V to 16 V
Additional Details
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The ADR225 is a precision 2.5 V band gap voltage reference specified for a high temperature operation of 175°C and 210°C. It uses a micropower core topology and laser trimming of highly stable, thin film resistors to achieve a temperature coefficient of 30 ppm/°C (maximum) up to 175°C and an initial accuracy of 0.4% (±10 mV maximum). A maximum operating current of 50 µA and a low dropout voltage allow the ADR225 to function very well in battery-powered equipment.

The ADR225 voltage reference is offered in an 8-lead SOIC package with an operating temperature range of −40°C to +175°C.

It is also available in an 8-lead ceramic flat pack (FLATPACK) with an operating temperature range of −40°C to +210°C. Both devices are designed for robustness at extreme temperatures and are qualified for 1000 hours of operation at the maximum temperature rating.

The ADR225 is a member of a growing series of high temperature qualified products offered by Analog Devices, Inc. For a complete selection table of the available high temperature products, see the high temperature product list and qualification data available at


  • Down-hole drilling and instrumentation
  • Avionics
  • Heavy industrial
  • High temperature environments
Part Models 3
1ku List Price Starting From $85.92

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Software & Part Ecosystem

Software & Part Ecosystem

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200°C High Temperature Data Acquisition and Control System Reference Design



200°C High Temperature Data Acquisition and Control System Reference Design

200°C High Temperature Data Acquisition and Control System Reference Design

Features and Benefits

  • Complete high temperature data acquisition reference platform with all components and assembly materials rated to at least 200°C
  • 10 channels of high precision analog to digital conversion
    • (2) Direct channels, 400ksps max
    • (8) Multiplexed channels, 16ksps max (including temp sensor)
    • Multiple GPIO for external control and optional external triggering
  • Complete software package including
    • Optimized firmware with RTOS for multiple modes of data acquisition
    • PC Host software for control, viewing and logging data
    • Source code available for all software
  • Form factor compatible with downhole oil/gas exploration instrumentation
  • Kit includes analog and digital/power breakout boards for rapid evaluation

Product Detail

EV-HT-200CDAQ1 builds on the CN0365 analog front end reference design from with the goal of providing a foundation for a high temperature, low power microcontroller-based data acquisition and control solution that meets the requirements for many downhole instrumentation and other high temperature applications. Based upon the AD7981 analog-to-digital SAR converter, this reference design demonstrates a full featured system with two high speed simultaneously sampled channels along with 8 additional multiplexed channels suitable for covering the acquisition requirements of a broad range of downhole tools (10 channels total). This analog front end is connected to the VORAGO Technologies VA10800 ARM® Cortex®-M0 based microcontroller via multiple SPI ports. Once acquired, the data can be processed locally or transmitted via a UART or optional RS485 communications interface. Other supporting components on the board, including memory, clock, power and passives are all rated for high temperature operation by their respective suppliers and verified to operate reliably at 200°C or higher. In addition to the hardware, open source firmware is supplied for the project using FreeRTOS with optimized drivers and data acqusition protocol with multiple modes of operation. Open source PC software included allows the users to connect to the board via UART to control acquisition modes, view data, log data and perform signal analysis. This platform is suitable for reference design, rapid prototyping (such as new sensor techniques) and lab testing of high temperature instrumentation systems.
Tools & Simulations

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LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Reference Designs

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High Temperature Data Acquisition System

16-Bit, 600 kSPS, Low Power Data Acquisition System for High Temperature Environments

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