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

Product Details

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

Applications/Uses

  • Conductance
  • Current
  • Material Thickness
  • Pressure
  • Resistance
  • Speed
  • Temperature
  • Voltage
Parametric specs for Display-Oriented ADCs
Resolution (±Counts) 2000
# Input Channels 1
Conv. Rate (ksps) (max) 0.0025
Data Bus 7-Segment
Diff/S.E. Input Diff. Only
External VREF (V) (min) 0
External VREF (V) (max) 9
Bipolar VIN (±V) (max) 9
Package/Pins MQFP/44
PLCC/44
Budgetary
Price (See Notes)
$5.27 @1k
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Simplified Block Diagram

MAX136: Typical Operating Circuit MAX136: Typical Operating Circuit Zoom icon

Technical Docs

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Parameters

Parametric specs for Display-Oriented ADCs
Resolution (±Counts) 2000
# Input Channels 1
Conv. Rate (ksps) (max) 0.0025
Data Bus 7-Segment
Diff/S.E. Input Diff. Only
External VREF (V) (min) 0
External VREF (V) (max) 9
Bipolar VIN (±V) (max) 9
Package/Pins MQFP/44
PLCC/44
Budgetary
Price (See Notes)
$5.27 @1k

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

Applications/Uses

  • Conductance
  • Current
  • Material Thickness
  • Pressure
  • Resistance
  • Speed
  • Temperature
  • Voltage

Description

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.

Simplified Block Diagram

MAX136: Typical Operating Circuit MAX136: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal