MAX136:Low Power, 31⁄2 Digit A/D Converter with Display Hold

The MAX136 is a monolithic analog-to-digital converter (ADC) with very high input impedance. It differs from the Maxim ICL7136 in that the MAX136 provides a Hold pin, which makes it possible to hold or "freeze" a reading. The MAX136 directly drives a nonmultiplexed liquid crystal (LCD) display, requiring no external drive circuitry. With minor external component changes, it is pin compatible with the ICL7116 but with significantly reduced power consumption, making the MAX136 a superior device for portable systems. Versatility and accuracy are inherent features of this ADC. The dual-slope conversion technique automatically rejects interference signals common in industrial environments. True differential inputs allow direct measurements of bridge transducer outputs or load cells. The zero-integrator phase eliminates overrange hangover and hysteresis effects. The MAX136 offers high accuracy by lowering rollover error to less than one count and zero reading drift to less than 1µV/°C.

Key Features
  • Power Dissipation Guaranteed Less than 1mW–9V Battery Life 3000 Hours Typical
  • Hold Pin Allows Indefinite Display Hold
  • Guaranteed First Reading Recovery from Overrange
  • On-Board Display Drive Capability—No External Circuitry Required
  • High-Impedance CMOS Differential Inputs
  • Low Noise (< 15µVP-P) Without Hysteresis or Overrange Hangover
  • Clock and Reference On-Chip
  • Zero Input Gives Zero Reading
  • True Polarity Indication for Precision Null Applications
  • Key Parameters Guaranteed Over Temperature
MAX136: Typical Operating Circuit
MAX136: Typical Operating Circuit
  • Conductance
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  • Material Thickness
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MAX136 Data SheetMAX136.pdf
Part NumberResolution
Conv. Rate
Data BusDiff/S.E. InputExternal VREF
External VREF
Bipolar VIN
maxminmaxmaxSee Notes
MAX13620000.00257-SegmentDiff. Only099MQFP/44
$5.02 @1k
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX136C/DActiveDICE SALES,;NA pin;DICE S;0°C to +70°CSee data sheet
MAX136CJLNo Longer AvailableTQFP;0°C to +70°CSee data sheet
MAX136CMH+DActiveMQFP,;44 pin;204.5 mm²0°C to +70°CLead Free
MAX136CMH+TDActiveMQFP,;44 pin;204.5 mm²0°C to +70°CLead Free
MAX136CMH-DNo Longer AvailableMAX136CMH+DMQFP;0°C to +70°CSee data sheet
MAX136CMH-TDNo Longer AvailableMAX136CMH+TDMQFP;0°C to +70°CSee data sheet
MAX136CPLNo Longer AvailableMAX136CPL+PDIP(W),;40 pin;835.7 mm²0°C to +70°CNo
MAX136CPL+ActivePDIP(W),;40 pin;835.7 mm²0°C to +70°CLead Free
MAX136CQH+DActivePLCC,;44 pin;311.5 mm²0°C to +70°CLead Free
MAX136CQH+TDActivePLCC,;44 pin;311.5 mm²0°C to +70°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX136CQH-DNo Longer AvailableMAX136CQH+DPLCC,;44 pin;311.5 mm²0°C to +70°CNo
MAX136CQH-TDNo Longer AvailableMAX136CQH+TDPLCC;44 pin0°C to +70°CSee data sheet
MAX136.pdf MAX136
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MAX136.pdf MAX136