308ksps ADC with DSP Interface and 78dB SINAD

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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.
MAX121: Functional Diagram MAX121: Functional Diagram Enlarge+

Key Features

  • 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


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

See parametric specs for Precision ADCs (< 5Msps) (432)

Part NumberResolution
Input ChannelsConv. Rate
ADC ArchitectureData BusDiff/S.E. InputInternal VREF
Bipolar VIN
ADCmaxnominalmaxSee Notes
MAX121 141308SARSPIS.E. Only5578-852
SOIC (W)/16
$20.62 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX121EVKIT: Evaluation Kit for the MAX121
Product Reliability Reports: MAX121.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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