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ADUCM361:  Low Power Precision Analog Microcontroller, ARM Cortex M3 with single Sigma-Delta ADC

Product Details

Product Status:Recommended for New Designs

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


  • Analog Input/Output
      Dual (24-bit) ADCs (ADuCM360)
      Single (24-bit) ADC (ADuCM361)
      Single Ended and fully Differential inputs
      See data sheet for additional features
  • Programmable Gain Amplifiers (PGA) for each ADC
    Programmable Current sources
    Voltage DAC output
    Buffers for external reference connection
  • Flexible input MUX for input channel selection to both ADCs
  • Microcontroller
      ARM Cortex™-M3 32-bit processor
      Serial Wire download and debug
      Internal Watch crystal for wakeup timer
      16 MHz Oscillator with 8-way Programmable Divider
  • Memory
      128k Bytes Flash/EE Memory, 8k Bytes SRAM
      In-circuit debug/download via Serial Wire and UART
  • Power
      Operates directly from a 3.0V battery
      Supply Range: 1.8V to 3.6V (max)
  • Power Consumption
      MCU Active Mode: Core consumes 290μA / MHz
      Active Mode: 1.0mA (All peripherals active), core operating at 500KHz
  • Power down mode: 4μA (WU Timer Active)
  • On-Chip Peripherals
      UART, I2C and 2 x SPI Serial I/O
      16-bit PWM Controller
      19-Pin Multi-Function GPIO Port
      See data sheet for additional features
  • Package and Temperature Range
      48 lead LFCSP (7mm x 7mm) package –40°C to 125°C
  • Development Tools
      Low-Cost QuickStart™ Development System
      Third-Party Compiler and emulator tool Support
  • Multiple Functional Safety features for improved diagnostics

ADuCM361 Functional Diagram for ADuCM361

Design Tools,Models,Drivers & Software

Title Content Type File Type
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Utilities and Conversions HTML
Development Tools Software Configurable Products HTML
ADuCM360/361 Power Calculator  (xlsx, 41 kB) Design Calculators XLSX
ADuCM360/ADuCM361 Digital Filter Response Model  (xlsx, 509 kB) Design Tool XLSX
ADuCM360/361 code examples and function libraries  (zip, 1143 kB) Code Examples ZIP

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

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Companion Products

Suggested Companion Products---

Recommended Low Power Hart Modem for the ADuCM361
  • For a Hart-compliant fully integrated FSK modem, we recommend the AD5700 or the AD5700-1.
Recommended Hart Modem Output DAC's for the ADuCM361
  • For 16-bit, loop powered, 4 mA to 20 mA DAC, we recommend the AD5421.
  • For 12-bit /16-bit, current source and voltage output DAC's, we recommend the AD5412 and the AD5422.
Recommended Digital Isolator for the ADuCM361 Recommended RS-232 Transceiver for the ADuCM361
  • For a standard UART to RS-232 interface, we recommend the ADM3202.
Recommended Digital Temperature Sensor for the ADuCM361
  • For high accuracy, low power, wide temperature range, we recommend the ADT7410.
Recommended Linear Regulator for the ADuCM361
  • For high output current, low dropout voltage and low shutdown current, we recommed the ADP1720.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

ADUCM361 Model Options
Price Table Help

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.

Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-ADUCM360QSPZ Status: Production Evaluation Board $119.00 Yes -

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.

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