+5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC

Best Linearity for +5V, 18-Bit Sigma Delta

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The MAX1402 low-power, multichannel, serial-output analog-to-digital converter (ADC) features matched 200µA current sources for sensor excitation. This ADC uses a sigma-delta modulator with a digital decimation filter to achieve 16-bit accuracy. The digital filter’s user-selectable decimation factor allows the conversion resolution to be reduced in exchange for a higher output data rate. True 16-bit performance is achieved at an output data rate of up to 480sps. In addition, the modulator sampling frequency may be optimized for either lowest power dissipation or highest throughput rate. The MAX1402 operates from a +5V supply.

This device offers three fully differential input channels that may be independently programmed with a gain between +1V/V and +128V/V. Furthermore, it can compensate an input-referred DC offset up to 117% of the selected full-scale range. These three differential channels may also be configured to operate as five pseudo-differential input channels. Two additional, fully differential system-calibration channels are provided for gain and offset error correction.

The MAX1402 may be configured to sequentially scan all signal inputs and provide the results via the serial interface with minimum communications overhead. When used with a 2.4576MHz or 1.024MHz master clock, the digital decimation filter can be programmed to produce zeros in its frequency response at the line frequency and associated harmonics, ensuring excellent line rejection without the need for further post-filtering.

The MAX1402 is available in a 28-pin SSOP package.
MAX1402: Functional Diagram MAX1402: Functional Diagram Enlarge+

Key Features

  • 18-Bit Resolution, Sigma-Delta ADC
  • 16-Bit Accuracy with No Missing Codes to 480sps
  • Low Quiescent Current
    • 250µA (operating mode)
    • 2µA (power-down mode)
  • Matched On-Board Current Sources (200µA) for Sensor Excitation
  • 3 Fully Differential or 5 Pseudo-Differential Signal Input Channels
  • 2 Additional, Fully Differential Calibration Channels/Auxiliary Input Channels
  • Programmable Gain and Offset
  • Fully Differential Reference Inputs
  • Converts Continuously or On Command
  • Automatic Channel Scanning and Continuous Data Output Mode
  • Operates with +5V Analog Supply and +3V or +5V Digital Supply
  • 3-Wire Serial Interface—SPI™/QSPI™ Compatible
  • 28-Pin SSOP Package


  • Loop-Powered Systems
  • Portable Industrial Instruments
  • Portable Weight Scales
  • Pressure Sensors and Transducers
Part NumberResolution
Input Chan.Conv. Rate
ADC ArchitectureData BusDiff/S.E. InputExternal VREF
External VREF
Unipolar VIN
Bipolar VIN
ADCmaxminmaxmaxmaxSee Notes
MAX1402 1854.8Sigma-DeltaSPIDiff. Only02.
$12.14 @1k
See All Precision ADCs (< 5Msps) (464)
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.

MAX1400EVKIT: Evaluation Kit/Evaluation System for the MAX1400 and MAX1402
MAX1402EVC16: Evaluation Kit/Evaluation System for the MAX1400 and MAX1402
MAX1402EVKIT: Evaluation Kit/Evaluation System for the MAX1400 and MAX1402

CAD Symbols and Footprints

  • MAX1402CAI
  • MAX1402CAI+
  • MAX1402CAI+T
  • MAX1402CAI-T
  • MAX1402EAI
  • MAX1402EAI+
  • MAX1402EAI+T
  • MAX1402EAI-T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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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