18-Bit, 1Msps, Low-Power, Fully Differential SAR ADC

Fast and Low-Power 18-Bit SAR ADC with Reference Buffer

Please check latest availability status for a specific part variant.


The MAX11902 is an 18-bit, 1Msps, single-channel, fully differential SAR ADC with internal reference buffers. The MAX11902 provides excellent static and dynamic performance with best-in-class power consumption that directly scales with throughput. The device has a unipolar differential ±VREF input range. Supplies include a 3.3V supply for the reference buffers, a 1.8V analog supply, a 1.8V digital supply, and a 1.5V to 3.6V digital interface supply.

This ADC achieves 98.9dB SNR and -123dB THD, guarantees 18-bit resolution with no-missing codes and 1.5 LSB INL (max).

The MAX11902 communicates data using a SPI-compatible serial interface. The MAX11902 is offered in a 20-pin, 4mm x 4mm, TQFN package and is specified over the -40°C to +85°C* operating temperature range.

MAX11902: Application Diagram MAX11902: Application Diagram Enlarge+

Key Features

  • High DC/AC Accuracy Provides Better Measurement Quality
    • 18-Bit Resolution with No Missing Codes
    • ±1.5 LSB INL and ±0.5 LSB DNL Maximum at 18 Bits
    • 98.9dB SNR and 98.8dB SINAD at fIN = 10kHz
    • -125dB SFDR and -123dB THD at fIN = 10kHz
  • High Sampling Rate SAR Architecture Enables Fast Settling and Acquisition
    • 1Msps Throughput with No Pipeline Delay
  • Integration Simplifies Design
    • Integrated Reference Buffers
    • ±VREF Unipolar Differential Analog Input Range
  • Scalable Ultra-Low Power Supply Reduces Power Consumption
    • 6.7mW at 1Msps
    • Scale as 6.7µW/ksps
  • Flexible Low-Voltage Supplies Save Cost
    • 1.8V Analog and Digital Core Supply
    • 1.5V to 3.6V Digital Interface Supply
    • 3.3V REFVDD Reference Buffer Supply
  • Flexible, Industry-Standard Serial Interface and Small Package Reduce Size
    • SPI-/QSPI-/MICROWIRE®/DSP-Compatible
    • 20-Pin, 4mm x 4mm, TQFN Package


  • Automatic Test Equipment
  • Battery-Powered Equipment
  • Data Acquisition Systems
  • Medical Instrumentation
  • Process Control and Industrial Automation
  • Telecommunications
  • Test and Measurement

See parametric specs for Precision ADCs (< 5Msps) (437)

Part NumberResolution
Input Chan.Conv. Rate
ADC ArchitectureData BusDiff/S.E. InputExternal VREF
External VREF
Unipolar VIN
ADCmaxminmaxmaxSee Notes
MAX11902 1811000SAR
DSP-Compatible Serial
Diff. Only2.53.63.698-1231.5
$16.75 @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.

MAX11905EVKIT: Evaluation Kit for the MAX11900, MAX11901, MAX11902, MAX11903, MAX11904, and MAX11905

Tools & Models

  • MAX11900-5 IBIS Model
  • Product Reliability Reports: MAX11902.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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