Features and Benefits

  • 14-Bit Resolution
  • 2.9µs Conversion Time/308ksps Throughput
  • 400ns Acquisition Time
  • Low Noise and Distortion
    • 78dB SINAD
    • -85dB THD
  • ±5V Bipolar Input Range, Overvoltage Tolerant to ±15V
  • 210mW Power Dissipation
  • Continuous-Conversion Mode Available
  • 30ppm/°C, -5V Internal Reference
  • Interfaces to DSP Processors
  • 16-Pin DIP and SO Packages, 20-Pin SSOP Package

Product Details

The MAX121 is a complete, BiCMOS, serial-output, sampling 14-bit analog-to-digital converter (ADC) that combines an on-chip track/hold and a low-drift, low-noise, buried-zener voltage reference with fast conversion speed and low power consumption. The throughput rate is as high as 308k samples per second (ksps). The full-scale analog input range is ±5V.

The MAX121 utilizes the successive-approximation architecture with a high-speed DAC to achieve both fast conversion speeds and low-power operation. Operating with +5V and -12V or -15V power supplies, power consumption is only 210mW.

The MAX121 can be directly interfaced to the serial port of most popular digital-signal processors, and comes in space-saving 16-pin DIP and SO and smaller 20-pin SSOP packages. The MAX121 operates with TTL- and CMOS-compatible clocks in the frequency range from 1.1MHz to 5.5MHz. All logic inputs and outputs are TTL- and CMOS-compatible. This data sheet includes application notes for easy interface to TMS320, µPD77230, and ADSP2101 digital-signal processors, as well as µPs using the Motorola SPI and QSPI interface standards.


  • Audio and Telecom Processing
  • Digital Signal Processing
  • DSP Servo Control
  • Spectrum Analysis
  • Speech Recognition and Synthesis

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)

Product Recommendations

MAX121 Companion Parts

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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.

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