ICL7126

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

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Description

The Maxim ICL7126 is a monolithic analog to digital converter with very high input impedance. On-board active components include segment drivers, segment decoders, voltage reference and a clock circuit. The ICL7126 directly drives a non-multiplexed liquid crystal (LCD) display, requiring no external display drive circuitry. Significantly reduced power consumption makes the ICL7126 a superior device, especially for portable systems.

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 ICL7126 eliminates overrange hangover and hysteresis effects. The Zero Integrator phase also allows the use of larger auto zero capacitors reducing noise further. Finally, this device offers high accuracy by lowering rollover error to less than one count and zero reading drift to less than 1μV/°C.
ICL7126: Typical Operating Circuit ICL7126: Typical Operating Circuit Enlarge+

Key Features

  • Improved 2nd Source!
  • Power dissipation guaranteed less than 1mW-9V battery life 3000 hours typical
  • Guaranteed first reading recovery from overrange
  • Zero Input Gives Zero Reading
  • Drives LCD Displays Directly
  • Low Noise (15μV p-p) without hysteresis or overrange hangover
  • True Differential Reference and Input
  • Monolithic, Low Power CMOS

Applications/Uses

  • Conductance
  • Current
  • Material Thickness
  • Pressure
  • Resistance
  • Speed
  • Temperature
  • Voltage
Part NumberResolution
(±Counts)
Conv. Rate
(ksps)
Data BusDiff/S.E. InputInternal VREF
(V)
External VREF
(V)
Bipolar VIN
(±V)
Package/PinsBudgetary
Price
maxnominalmaxmaxSee Notes
ICL7126 20000.037-SegmentDiff. Only2.893.5
PDIP/40
PLCC/44
$8.63 @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 1041 Understanding Integrating ADCs

Quality and Environmental Data

Request Reliability Report for: ICL7126 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • ICL7126CPL+
  • 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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    Related Resources


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