Features and Benefits

  • Analog input/output
    • Multiple channel, 12-bit, 1 MSPS ADC
      • 2 differential pairs with input PGA
      • General-purpose inputs (differential or single-ended)
        • ADuC7121: 7 channels
    • Fully differential and single-ended modes
    • 0 V to VREF analog input voltage range (single-ended mode)
    • 5 low noise IDACs
      • 250 mA, 200 mA, 45 mA, 80 mA, 20 mA
    • 12-bit voltage output DACs
      • ADuC7121: 4 channels
    • 4× 12-bit voltage output DACs
    • On-chip voltage reference
    • On-chip temperature sensor
  • Microcontroller
    • 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
    • External clock source up to 41.78 MHz
    • 41.78 MHz PLL with programmable divider
  • Memory
    • 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
    • 4× general-purpose timers
    • Wake-up timers and WDT
    • Power supply monitor
    • IDAC monitor
    • Temperature monitor
  • Vectored interrupt controller for FIQ and IRQ
    • 8 priority levels for each interrupt type
    • Interrupt on edge or level external pin inputs
  • Power
    • Specified for 3 V operation
    • Normal mode: 11 mA at 5.22 MHz, 30 mA at 41.78 MHz
  • Packages and temperature range
    • 7 mm × 7 mm 108-ball CSP_BGA
    • Fully specified for –40°C to +105°C operation
  • Tools
    • Low cost QuickStart development system
    • Full third party support

Product Details

The ADuC7120/ADuC7121 are fully integrated, 12-bit, 1 MSPS, data acquisition systems incorporating a high performance multichannel ADC, 16-bit/32-bit microcontroller unit (MCU), and Flash®/EE memory on a single chip.

The analog-to-digital converter (ADC) consists of eleven single-ended inputs for the ADuC7120 (seven single-ended inputs for the ADuC7121) and two extra differential input pairs. The two differential input pairs 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 reference, temperature sensor, and voltage comparator complete the ADC peripheral set.

The ADuC7120/ADuC7121 provide 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 an 11-bit resolution. The five current digital-to-analog converters (IDACs) are as follows: IDAC0 with 250 mA full-scale (FS) output, IDAC1 with 200 mA FS output, IDAC2 with 45 mA FS output, IDAC3 with 80 mA FS output, and IDAC4 with 20 mA FS output.

The ADuC7120/ADuC7121 also contain up to 12 voltage output DACs. The DAC output range is programmable to one of three voltage ranges.

The devices operate from an on-chip oscillator and a phase-locked loop (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 reduced instruction set computer (RISC) machine, which offers up to 41 MIPS peak performance. 8 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 devices operate from 3.0 V to 3.6 V, and they are specified over the −40°C to +105°C industrial temperature range. The IDACs are powered from a separate input power supply, PVDD. When operating at 41.78 MHz, the power dissipation is typically 120 mW. The ADuC7120/ADuC7121 are available in a 108-ball chip-scale package ball grid array [CSP_BGA].


  • Optical modules—tunable laser

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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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.