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ADUC7129:  Precision Analog Microcontroller ARM7TDMI® MCU with 12-Bit ADC and DDS DAC

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The ADuC7128/ADuC7129 are fully integrated, 1 MSPS, 12-bit data acquisition systems incorporating a high performance, multi-channel analog-to-digital converter (ADC), DDS with line driver, 16-/32-bit MCU, and Flash/EE memory on a single chip.

The ADC consists of up to 14 single-ended inputs. The ADC can operate in single-ended or differential input modes. The ADC input voltage is 0 to VREF. Low drift band gap reference, temperature sensor, and voltage comparator complete the ADC peripheral set.

The ADuC7128/ADuC7129 integrate a differential line driver output. This line driver transmits a sine wave whose values are calculated by an on-chip DDS or a voltage output determined by the DACDAT MMR.

The devices operate from an on-chip oscillator and PLL, generating an internal high frequency clock of 41.78 MHz. This clock is routed through a programmable clock divider from which the MCU core clock operating frequency is generated.

The microcontroller core is an ARM7TDMI®, 16-/32-bit reduced instruction set computer (RISC), offering up to 41 MIPS peak performance. There are 126 kB of nonvolatile Flash/EE provided on-chip, as well as 8 kB of SRAM. The ARM7TDMI core views all memory and registers as a single linear array.

On-chip factory firmware supports in-circuit serial download via the UART serial interface port, and nonintrusive emulation is also supported via the JTAG interface. These features are incorporated into a low cost QuickStart™ development system supporting this MicroConverter® family.

The parts operate from 3.0 V to 3.6 V and are specified over an industrial temperature range of −40°C to +125°C. When operating at 41.78 MHz, the power dissipation is 135 mW. The line driver output, if enabled, consumes an additional 30 mW.


Analog I/O

  • Multi-Channel, 12-bit, 1MSPS ADC
    - Up to 14 analog-to-digital converter (ADC) channels
    - Fully differential and single-ended modes
    - 0 to VREF Analog Input Range
  • 10-bit digital-to-analog converter (DAC)
    - 32-bit 21 MHz direct digital synthesis (DDS)
    - Current-to-Voltage (I/V) Conversion
    - Integrated second-order low-pass filter (LPF)
    - DDS Input to DAC
    - 100 Ω line driver
  • On-Chip Voltage Reference
  • On-Chip Temperature Sensor (±3°C)
  • Voltage Comparator


  • ARM7TDMI Core, 16/32-bit RISC architecture
  • JTAG Port supports code download and debug
  • External Watch crystal/ Clock Source
    - 41.78 MHz PLL with 8 way Programmable Divider
    - Optional Trimmed On-Chip Oscillator


  • 126 kB Flash/EE memory, 8 kB SRAM
  • In-Circuit Download, JTAG based Debug
  • Software triggered in-circuit re-programmability

On-Chip Peripherals

  • 2 x UART, 2 x I2C® and SPI Serial I/O
  • Up to 40-pin GPIO port
  • 5 X General Purpose Timers
  • Wake-up and watchdog timers (WDT)
  • Power Supply Monitor
  • 16-bit PWM generator
  • Quadrature Encoder
  • Programmable logic array (PLA)


  • Specified for 3V operation
  • Active Mode:
    11 mA (@ 5.22 MHz)
    45 mA (@ 41.78 MHz)

Packages and Temperature Range

  • 64-lead 9 mm × 9 mm LFCSP package, −40°C to 125°C
  • 64-lead LQFP, −40°C to +125°C
  • 80-lead LQFP, −40°C to +125°C


  • Low-Cost QuickStart Development System
  • Full Third-Party Support

Functional Block Diagram for ADuC7129


Наименование Тип контента Тип файлов
ADuC7128/ADuC7129: Precision Analog Microcontroller ARM7TDMI® MCU with 12-Bit ADC and DDS DAC Data Sheet (Rev 0, 05/2007) (pdf, 1801 kB) Технические описания PDF
Using Integrated Precision Analog Microcontrollers to Simplify Data Acquisition System Design
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