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)


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Sigma-Delta ADC Tutorial

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

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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.

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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.