Low-Power, 3 1/2 Digit A/D Converter

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The Maxim ICL7137 is a monolithic analog to digital converter with all the necessary active devices to directly interface with a light emitting diode (LED) display. Excluding the LED display current, the ICL7137 supply current is under 200μA, making it suitable for battery operation.

Versatility and accuracy are inherent features of this converter. The dual-slope conversion technique automatically rejects interference signals common in industrial environments. The true differential input and reference are particularly useful when making ratiometric measurements (ohms or bridge transducers), and the zero integrator phase in Maxim's ICL7137 eliminates overrange hangover and hysteresis effects. Finally, this device offers high accuracy by lowering rollover error to less than one count and zero reading drift to less than 1μV/°C.
ICL7137: Typical Operating Circuit ICL7137: Typical Operating Circuit Enlarge+

Key Features

  • Improved 2nd Source!
  • Guaranteed first reading recovery from overrange
  • Zero Input Gives Zero Reading
  • Drives LED Displays Directly
  • Low Noise (15μV p-p) without hysteresis or overrange hangover
  • True Differential Reference and Input
  • Monolithic, Low Power CMOS Design


  • Conductance
  • Current
  • Material Thickness
  • Pressure
  • Resistance
  • Speed
  • Temperature
  • Voltage
Part NumberResolution
Conv. Rate
Data BusDiff/S.E. InputInternal VREF
External VREF
External VREF
Bipolar VIN
maxnominalminmaxmaxSee Notes
ICL7137 20000.00257-SegmentDiff. Only3-550.2
$6.64 @500
See All Display-Oriented ADCs (28)
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.

Technical Documents

Tutorial 2102 Delta-Sigma ADCs Replace Integrating ADCs for Panel Meters
Tutorial 1883 LEDs Are Still Popular (and Improving) after All These Years
Tutorial 1041 Understanding Integrating ADCs

Quality and Environmental Data

Request Reliability Report for: ICL7137 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • ICL7137CJL
  • ICL7137CMH+D
  • ICL7137CMH+TD
  • ICL7137CMH-TD
  • ICL7137CPL
  • ICL7137CPL+
  • ICL7137CPL+3
  • ICL7137CPL-3
  • ICL7137CQH+D
  • ICL7137CQH+TD
  • ICL7137CQH-D
  • 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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