The ADuCM360 is a fully integrated, 3.9 kSPS, 24-bit data acquisition system that incorporates dual high performance, multichannel sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), a 32-bit ARM Cortex™-M3 processor, and Flash/EE memory on a single chip. The ADuCM360 is designed for direct interfacing to external precision sensors in both wired and battery-powered applications. The ADuCM361 contains all the features of the ADuCM360 except that only one 24-bit Σ-Δ ADC (ADC1) is available.
The ADuCM360/ADuCM361 contain an on-chip 32 kHz oscillator and an internal 16 MHz high frequency oscillator. The high frequency oscillator is routed through a programmable clock divider from which the operating frequency of the processor core clock is generated. The maximum core clock speed is 16 MHz; this speed is not limited by operating voltage or temperature.
The microcontroller core is a low power ARM Cortex-M3 processor, a 32-bit RISC machine that offers up to 20 MIPS peak performance. The Cortex-M3 processor incorporates a flexible, 11-channel DMA controller that supports all wired communica-tion peripherals (SPI, UART, and I2C). Also integrated on chip are 128 kB of nonvolatile Flash/EE memory and 8 kB of SRAM.
The analog subsystem consists of dual ADCs, each connected to a flexible input mux. Both ADCs can operate in fully differential and single-ended modes. Other on-chip ADC features include dual programmable excitation current sources, diagnostic current sources, and a bias voltage generator of AVDD_REG/2 (900 mV) to set the common-mode voltage of an input channel. A low-side internal ground switch is provided to allow power-down of an external circuit (for example, a bridge circuit) between conversions.
The ADCs contain two parallel filters: a sinc3 or sinc4 filter in parallel with a sinc2 filter. The sinc3 or sinc4 filter is used for precision measurements. The sinc2 filter is used for fast measure-ments and for the detection of step changes in the input signal.
The devices contain a low noise, low drift internal band gap ref-erence, but they can be configured to accept one or two external reference sources in ratiometric measurement configurations. An option to buffer the external reference inputs is provided on chip. A single-channel buffered voltage output DAC is also provided on chip.
The ADuCM360/ADuCM361 integrate a range of on-chip peripherals, which can be configured under microcontroller software control as required in the application. The peripherals include UART, I2C, and dual SPI serial I/O communication controllers; a 19-pin GPIO port; two general-purpose timers; a wake-up timer; and a system watchdog timer. A 16-bit PWM controller with six output channels is also provided.
The ADuCM360/ADuCM361 are specifically designed to operate in battery-powered applications where low power operation is critical. The microcontroller core can be configured in a normal operating mode that consumes 290 μA/MHz (including flash/ SRAM IDD). An overall system current consumption of 1 mA can be achieved with both ADCs on (input buffers off), PGA gain of 4, one SPI port on, and all timers on.
The ADuCM360/ADuCM361 can be configured in a number of low power operating modes under direct program control, including a hibernate mode (internal wake-up timer active) that consumes only 4 μA. In hibernate mode, peripherals such as external interrupts or the internal wake-up timer can wake up the device. This mode allows the part to operate with ultralow power and still respond to asynchronous external or periodic events.
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|Title||Content Type||File Type|
|ADuCM360/ADuCM361: Low Power, Precision Analog Microcontroller with Dual Sigma-Delta ADCs, ARM Cortex-M3 Data Sheet (Rev A, 11/2012) (pdf, 418 kB)||Data Sheets|
|AN-1111: Options for Minimizing Power Consumption When Using the ADuCM360/ADuCM361 (pdf, 244 kB)||Application Notes|
|AN-1160: Cortex-M3 Based ADuCxxx Serial Download Protocol (pdf, 144 kB)||Application Notes|
AN-1159: I2C-Compatible Interface on Cortex-M3 Based Precision Analog Microcontroller (ADuCxxx Family)
(pdf, 227 kB)
|Complete 4 mA to 20 mA Loop Powered Field Instrument with HART Interface (pdf, 259 kB)||Circuit Note|
|CN-0300: Complete Closed-Loop Precision Analog Microcontroller Thermocouple Measurement System with 4 mA to 20 mA Output (pdf, 411 kB)||Circuit Note|
|CN-0221: USB-Based Temperature Monitor Using the ADuCM360 Precision Analog Microcontroller and an External Thermocouple (pdf, 366 kB)||Circuit Note|
|ADI Elves Software Tool and the ADuCM360 Microcontroller Getting Started Video||Videos||HTML|
|UG-367: Using the ADuCM360/ADuCM361 Low Power, Precision Analog Microcontroller with Dual Sigma-Delta ADCs, ARM Cortex-M3 (pdf, 1642 kB)||User Guides|
|UG-457: ADuCM360 Development Systems Getting Started Tutorial (pdf, 995 kB)||User Guides|
|Signal Chain Solution for 4-mA to 20-mA HART Enabled Field Instrument Applications (26 Mar 2013)||Press Releases||HTML|
|Analog Devices’ Analog Microcontroller with ARM Cortex M3 and Dual 24-Bit Sigma-delta A/D Converters Offers Highest Accuracy, Lowest Power (04 Jun 2012)||Press Releases||HTML|
|Glossary of EE Terms||Glossary||HTML|
|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/ADuCM361 Digital Filter Response Model (xls, 509 kB)||Design Tool||XLS|
|ADuCM360/361 code examples and function libraries (zip, 1143 kB)||Code Examples||ZIP|
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