Low Power Precision Analog Microcontroller, ARM Cortex M3 with single Sigma-Delta ADC

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Product Details

The ADuCM361 is a fully integrated, 4 kSPS, 24-bit data acquisition system incorporating high performance multi-channel sigma-delta (Σ-Δ) analog-to-digital converter (ADC), 32-bit ARM Cortex M3® MCU, and Flash/EE memory on a single chip allowing direct interfacing to external precision sensors in both wired and battery powered applications.

The ADuCM361 contains all the features of the ADuCM360 except that one of the AFE’s is removed.

The device contains an on-chip 32 KHz oscillator and an internal 16MHz high-frequency oscillator. This clock is routed through a programmable clock divider from which the MCU core clock operating frequency is generated. The maximum core clock speed is 16MHz, not limited by operating voltage or temperature.

The microcontroller core is a low power ARM Cortex-M3, 32-bit RISC machine, offering up to 20 MIPS peak performance, incorporating a flexible 11-channel DMA controller supporting SPI, UART, I2C communication peripherals. 128k Bytes Flash/EE and 8k Bytes SRAM are integrated on-chip.

Benefits: Flexibility with Precision

The Analog sub-system consists of an ADC connected to a flexible input MUX, operateingin fully differential and single ended modes. Other ADC features include dual programmable excitation current sources, burn-out current sources and a bias voltage generator to set the common-mode voltage of an input channel. A low-side internal ground switch allows bridge power down between conversions. The ADC contains two parallel filters – The Sinc3 or Sinc4 filter is for precision measurements. The Sinc2 filter is for fast measurements and for detection of step changes in the input signal The device contains a low noise, low drift internal band-gap reference or can accept up to 2 external reference sources in ratiometric measurement configurations. A single-channel buffered voltage output DAC is available. A range of on-chip peripherals are integrated on-chip. These include UART, I2C and dual SPI Serial I/O communication controllers, 19-Pin GPIO Ports, 2 General Purpose Timers, Wake-up Timer, Watchdog Timer and a 16-bit PWM with six output channels.

Low Power

The ADuCM361 is designed to operate in battery powered applications where low power operation is critical. The microcontroller core can be configured in a normal operating mode consuming 290μA/MHz (including Flash/SRAM Idd) resulting in an overall system current consumption of 1mA with all peripherals active.

The part can be configured in a number of low power operating modes under direct program control, including hibernate mode (internal wake-up timer active) consuming only 4μA. In hibernate mode, peripherals such as external interrupts or the internal wake up timer can wake up the device. This allows the part to operate in an ultra-low power operating mode and still respond to asynchronous external or periodic events.

Ease of Use

On-chip factory firmware supports in-circuit serial download via a serial wire interface (2-pin JTAG system) and UART while non-intrusive emulation is also supported via the serial wire interface. These features are incorporated into a low-cost QuickStart Development System.


  • Industrial
    • Industrial Automation and Process Control
    • 4 mA to 20 mA Loop-Powered Smart Sensor Systems
    • Temperature Sensor
    • Pressure Sensor
    • Flow Meter
    • Smart Transmitters
  • Medical
    • Portable Medical devices
    • Patient monitoring
  • Instrumentation
    • Data Acquisition Modules
    • Handheld Instruments

Product Lifecycle

icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits


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EVAL-ADUCM360 Circuit Diagram

Product Details

The ADuCM360/ADuCM361 is a low power fully integrated, 24-bit data acquisition system incorporating dual, high performance multi-channel sigma-delta (Σ-Δ) ADCs, ARM Cortex M3® MCU, and Flash/EE memory on a single chip.

ADI provides low cost development platforms for the Cortex M3 based ADuCxxx microcontrollers.

EVAL-ADuCM360QSPZ evaluation kit can be used to fully evaluate the ADuCM361. The ADuCM360/361 are pin compatible and are identical except the ADC0 is not available on ADuCM361.

The hardware is designed for simplicity, flexibility and ease of use. This facilitates performance evaluation of the device with the minimum external components. The supplied ADI J-link OB emulator connects to the miniboard, providing supply, UART communication and debug capability.

The QuickStart Plus Kit for the ADuCM360/361 Precision Analog Microcontrollers features true non-intrusive Serial Wire emulation and an assembly & C-source debugging environment. This provides a comprehensive hardware development environment.

QuickStart Plus Kit Contents:

Hardware Contents

  • Evaluation Board
  • USB Cable
  • ADI J-Link OB emulator
Software Contents

  • Keil MDKARMevaluation version integrated software development tool
  • IAR EWARM evaluation version integrated software development tool
  • CM3WSD Serial DownloaderExample Code
  • Function Libraries
  • Get Started User Guide
  • Datasheets, Application Notes, Etc.

Note that the J-Link Lite and interface boards previously included in this development system are being replaced by a new ADI J-Link OB emulator with similar functionalities.

Software & Systems Requirements


Tools & Simulations

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Design Tools

Reference Designs


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CN0319 Circuit Diagram

CN0319 Photo


CN0221 Circuit Diagram

CN0221 Photo

Product Recommendations

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ADUCM361 Companion Parts

Recommended Hart Modem Output DAC's

  • For 16-bit, loop powered, 4 mA to 20 mA DAC: AD5421.
  • For 12-bit /16-bit, current source and voltage output DAC's: AD5412, AD5422.

Recommended Digital Isolator

Recommended Digital Temperature Sensor

  • For high accuracy, low power, wide temperature range: ADT7410.

Recommended Linear Regulator

  • For high output current, low dropout voltage and low shutdown current, we recommed the ADP1720.: ADP1720.

Recommended Low Power Hart Modem

Recommended RS-232 Transceiver

  • For a standard UART to RS-232 interface: ADM3202.

Design Resources

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

ADUCM361 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints



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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.