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

Product Details

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


    Title Content Type File Type
    ADuC7121: Precision Analog Microcontroller, 12-Bit Analog I/O, ARM7TDMI MCU Data Sheet (Rev C, 11/2014) (pdf, 1078 kB) Data Sheets PDF
    Using Integrated Precision Analog Microcontrollers to Simplify Data Acquisition System Design
    The ins and outs (the I/O) of using Analog Microcontrollers to manage data acquisition applications
    Webcasts WEBCAST
    Full-Featured Pedometer Design Realized with 3-Axis Digital Accelerometer  (pdf, 598 kB)
    Analog Dialogue, June 2010
    Analog Dialogue PDF
    Full-Featured Pedometer Design Realized with 3-Axis Digital Accelerometer  (pdf, 598 kB)
    Analog Dialogue, June 2010
    Technical Articles PDF
    Human Fall Detection Using New MEMS Accelerometer Technology
    For humans, an unobserved fall can have very serious consequences. Statistics show that the majority of serious consequences are not the direct result of falling, but rather are due to a delay in assistance and treatment. Post-fall consequences can be greatly reduced if relief personnel can be alerted in time.
    (ECN, December 9, 2009)
    Technical Articles HTML
    Simplifying Design of Industrial Process-Control Systems with PLC Evaluation Boards (Part 1 of 2)
    PLC evaluation board applications for industrial process-control systems are diverse, ranging from simple traffic control to complex electrical power grids, from environmental control systems to oil-refinery process control.
    (Industrial Control DesignLine, 8/24/09)
    Technical Articles HTML
    Low Power, Low Cost, Wireless ECG Holter Monitor Technical Articles HTML
    Impedance Measurement Blood Analysis Systems Technical Articles HTML
    Integrated Route Taken to Pulse Oximetry
    by Aude Richard and Brian Moss, Analog Devices, Inc. (EE Times, 12/6/2004)
    Technical Articles HTML
    Precision Analog Microcontroller Simplifies Optical Transceiver Design  (pdf)
    by Eamon Neary and Nobuhiro Matsuzoe, Analog Devices, Inc. (Information Quarterly, Volume 3, Number 2, 2004)
    Technical Articles PDF
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    Development Tools Software Configurable Products HTML

    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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    Price, packaging, availability

    ADUC7121 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.

    ADuC7121 QuickStart Plus Development System
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    EVAL-ADUC7121QSPZ Status: Production ADuC7121 Quickstart plus development system $159.00 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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