1. Products
  2. Processors and Microcontrollers
  3. Microcontrollers
  4. 8052 Core Products
  5. ADUC834


Features and Benefits

  • High Resolution - ADCs
    • 2 Independent ADCs (16-Bit and 24-Bit Resolution)
    • 24-Bit No Missing Codes, Primary ADC
    • 21-Bit rms (18.5-Bit p-p) Effective Resolution @ 20 Hz
    • Offset Drift 10 nV/C, Gain Drift 0.5 ppm/C
  • Memory
    • 62 Kbytes On-Chip Flash/EE Program Memory
    • 4 Kbytes On-Chip Flash/EE Data Memory
    • Flash/EE, 100 Year Retention, 100 Kcycles Endurance
    • 3 Levels of Flash/EE Program Memory Security
    • In-Circuit Serial Download (No External Hardware)
    • High Speed User Download (5 Seconds)
    • 2304 Bytes On-Chip Data RAM
  • 8051-Based Core
    • 8051 Compatible Instruction Set
    • 32 kHz External Crystal
    • On-Chip Programmable PLL (12.58 MHz Max)
    • 3  16-Bit Timer/Counter
    • 26 Programmable I/O Lines
    • 11 Interrupt Sources, Two Priority Levels
    • Dual Data Pointer, Extended 11-Bit Stack Pointer
  • See data sheet for additional features

Product Details

The ADuC834 is a complete smart transducer front end, integrating two high resolution - ADCs, an 8-bit MCU, and program/data Flash/EE memory on a single chip.

The two independent ADCs (primary and auxiliary) include a temperature sensor and a PGA (allowing direct measurement of low level signals). The ADCs with on-chip digital filtering and programmable output data rates are intended for the measurement of wide dynamic range, low frequency signals, such as those in weigh scale, strain-gage, pressure transducer, or temperature measurement applications.

The device operates from a 32 kHz crystal with an on-chip PLL generating a high frequency clock of 12.58 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 8052 and therefore 8051 instruction set compatible with 12 core clock periods per machine cycle.

62 Kbytes of nonvolatile Flash/EE program memory, 4 Kbytes of nonvolatile Flash/EE data memory, and 2304 bytes of data RAM are provided on-chip. The program memory can be configured as data memory to give up to 60 Kbytes of NV data memory in data logging applications.

On-chip factory firmware supports in-circuit serial download and debug modes (via UART), as well as single-pin emulation mode via the EA pin. The ADuC834 is supported by a QuickStart™ development system featuring low cost software and hardware development tools.


  • Intelligent sensors
  • Weigh scales
  • Portable instrumentation, battery-powered systems
  • 4–20 mA transmitters
  • Data logging
  • Precision system monitoring

Product Lifecycle icon-recommended Production

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.

Evaluation Kits (1)

Documentation & Resources

  • View All (21)
  • Evaluation Design Files (1)
  • Data Sheets (2)
  • Application Notes (15)
  • User Guides (2)
  • Technical Articles (1)
  • Application Notes

    Software & Systems Requirements

    Code Examples

    Tools & Simulations

    Design Tools

    Sigma-Delta ADC Tutorial

    An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    ADUC834BCPZ Material Declaration Reliability Data 56-Lead LFCSP (8mm x 8mm w/ EP)
    ADUC834BSZ Material Declaration Reliability Data 52-Lead MQFP (10mm x 10mm)
    Wafer Fabrication Data

    PCN-PDN Information

    Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

    Sample & Buy

    Ordering FAQs

    See our Ordering FAQs for answers to questions about online orders, payment options and more.


    Buy Now Pricing

    (**) Displayed Buy Now Price and Price Range is based on small quantity orders.


    List Pricing

    (*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


    Lead Times

    Please see the latest communication from our CCO regarding lead times.



    Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

    Price Table Help


    Evaluation Boards

    Pricing displayed is based on 1-piece.

    Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

    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.