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ADUC7121:  Precision Analog Microcontroller, 12-Bit Analog I/O, ARM7TDMI MCU

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The ADuC7121 is a fully integrated, 1 MSPS, 12-bit data acquisi-tion system incorporating a high performance multichannel ADC, 16-bit/32-bit MCU, and Flash®/EE memory on a single chip.

The ADC consists of up to seven single-ended inputs and two extra differential input pairs. The two differential pair inputs can be routed through a programmable gain amplifier (PGA). The ADC can operate in single-ended or differential input mode. The ADC input voltage is 0 V to VREF. A low drift band gap ref-erence, temperature sensor, and voltage comparator complete the ADC peripheral set.

The ADuC7121 provides five current output digital-to-analog converters (DACs). The current sources (five current DACs) feature low noise and low drift high-side current output at 11-bit resolution. The five IDACs are as follows: IDAC0 with 250 mA full-scale (FS) output, IDAC1 with 200 mA FS output, IDAC2 with 80 mA FS output, IDAC3 with 45 mA FS output, and IDAC4 with 20 mA FS output.

The ADuC7121 also contains four voltage output digital-to-analog converters (DACs). The DAC output range is programmable to one of three voltage ranges.

The devices operate from an on-chip oscillator and a PLL generating an internal high frequency clock of 41.78 MHz (UCLK). 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-bit/32-bit RISC machine, which offers up to 41 MIPS peak performance. Eight kB of SRAM and 126 kB of nonvolatile Flash/EE memory are provided on chip. The ARM7TDMI core views all memory and registers as a single linear array.

On-chip factory firmware supports in-circuit serial download via the I2C serial interface port; 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 device operates from 3.0 V to 3.6 V, and it is specified over an industrial temperature range of −10°C to +95°C. The IDACs are powered from a separate 2 V input power supply. When operating at 41.78 MHz, the power dissipation is typically 120 mW. The ADuC7121 is available in a 108-ball chip scale package ball grid array [CSP_BGA].

  • Optical modules—tunable laser

    Analog input/output

    • 9-channel, 12-bit, 1 MSPS ADC
      -- 2 differential pairs with
      input PGA
      -- 7 general-purpose inputs (differential or single-ended)
    • Fully differential and single-ended modes
    • See datasheet for additional information


    • ARM7TDMI core, 16-bit/32-bit RISC architecture
    • JTAG port supports code download and debug

    Clocking Options

    • Trimmed on-chip oscillator (±3%)
    • External watch crystal
      See datasheet for additional information


    • 126 kB flash/EE memory, 8 kB SRAM
    • In-circuit download, JTAG-based debug
    • Software-triggered in-circuit reprogrammability

    On-chip peripherals

    • UART, 2 × I2C and SPI serial I/O
    • 32-pin GPIO port
      See datasheet for additional information

    Vectored interrupt controller for FIQ and IRQ

    • 8 priority levels for each interrupt type
    • Interrupt on edge or level external pin inputs


    • Specified for 3 V operation
    • Active mode: 11 mA at 5 MHz, 40 mA at 41.78 MHz

    Packages and temperature range

    • 7 mm × 7 mm 108-ball CSP_BGA
    • Fully specified for –10°C to
      +95°C operation


    • Low cost QuickStart development system
    • Full third party support

    Functional Block Diagram for ADuC7121


    Наименование Тип контента Тип файлов
    ADuC7121: Precision Analog Microcontroller, 12-Bit Analog I/O, ARM7TDMI MCU Data Sheet (Rev C, 11/2014) (pdf, 1078 kB) Технические описания PDF
    Using Integrated Precision Analog Microcontrollers to Simplify Data Acquisition System Design
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    Приведенные цены действительны в США и указаны только для примерного бюджетного рассчета. Цены указаны в долларах США (за штуку в указанном размере партии) и могут быть изменены. Цены в других регионах могут отличаться в зависимости от местных пошлин, налогов, сборов и курсов валют. Для уточнения стоимости обращайтесь в местные офисы продаж Analog Devices, или к официальным дистрибьюторам. Цены на оценочные платы и наборы указаны за штуку независимо от количества.

    ADuC7121 QuickStart Plus Development System
    Модели Описание Цена Без использования свинца PCN/PDN Проверка наличия/
    Покупка/Запрос образца
    EVAL-ADUC7121QSPZ Статус: Prodn ADuC7121 Quickstart plus development system $ 159,00 Да -

    Цены указаны за одну штуку, в долларах США, на условиях ФОБ. Являются рекомендованными розничными ценами в США, приведены только для примерного расчета и могут меняться. Международные цены могут отличаться на величину местных пошлин, налогов, сборов и курсов валют.

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