ADI EVAL-ADUCM363QSPZ

The ADuCM362/ADuCM363 are fully integrated, 3.9 kSPS, 24-bit data acquisition systems that incorporate 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 ADuCM362/ ADuCM363 are designed for direct interfacing to external precision sensors in both wired and battery-powered applications. The ADuCM363 contains all the features of the ADuCM362, except that only one 24-bit Σ-Δ ADC (ADC1) is available.

The ADuCM362/ADuCM363 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 communication peripherals (both SPIs, both UARTs, and I²C). Also integrated on chip are up to 256 kB of nonvolatile Flash/EE memory and 24 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. Optional input buffers are provided for the analog inputs and the external reference inputs. These buffers can be enabled for all PGA gain settings.

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 measurements and for the detection of step changes in the input signal.

The devices contain a low noise, low drift internal band gap reference, 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 ADuCM362/ADuCM363 integrate a range of on-chip peripherals, which can be configured under microcontroller

• Pin compatible with the ADuCM360/ADuCM361
• Analog input/output Dual 24-bit ADCs (ADuCM362) Single 24-bit ADC (ADuCM363)
• Programmable ADC output rate (3.5 Hz to 3.906 kHz)
• Simultaneous 50 Hz/60 Hz noise rejection At 50 SPS continuous conversion mode At 16.67 SPS single conversion mode
• Flexible input mux for input channel selection to both ADCs
• Two 24-bit multichannel ADCs (ADC0 and ADC1) 6 differential or 12 single-ended input channels 4 internal channels for monitoring DAC, temperature sensor, IOVDD/4, and AVDD/4 (ADC1 only)
• Programmable gain (1 to 128) Gain of 1 with input buffer on/off supported
• RMS noise: 52 nV at 3.53 Hz, 200 nV at 50 Hz
• Programmable sensor excitation current sources
• On-chip precision voltage reference Two external reference options supported by both ADCs
• Single 12-bit voltage output DAC NPN mode for 4 mA to 20 mA loop applications
• Microcontroller ARM Cortex-M3 32-bit processor Serial wire download and debug Internal watch crystal for wake-up timer 16 MHz oscillator with 8-way programmable divider
• Memory Up to 256 kB Flash/EE memory, 24 kB SRAM In-circuit debug/download via serial wire and UART
• Power supply range: 1.8 V to 3.6 V (maximum)
• Power consumption, MCU active mode Core consumes 290 μA/MHz Overall system current consumption of 1.0 mA with core operating at 500 kHz (both ADCs on, input buffers off, PGA gain of 4, one SPI port on, and all timers on)
• Power consumption, power-down mode: 4 μA (wake-up timer active)
• On-chip peripherals 2× UART, I²C, and Σ×ΣP1 serial input/output (I/O) 16-bit pulse-width modulation (PWM) controller 19-pin multifunction GPIO port 2 general-purpose timers Wake-up timer/watchdog timer Multichannel DMA and interrupt controller DMA support for both SPI channels
• Package and temperature range 48-lead, 7 mm×7 mm LFCSP Specified for -40℃ to +125℃ operation
• Development tools Low cost QuickStart Development System Third-party compiler and emulator tool support
• Multiple diagnostic functions that support SIL certification

• Industrial automation and process control
• Intelligent precision sensing systems
• 4 m to 20 mA loop-powered smart sensor systems
• Medical devices, patient monitoring