MAX140

PRODUCTION

3 1/2 Digit ADC with Reference, Charge Pump, and Direct LED Drivers

Operates with Single +2.5V to +7V Supply, Accepts Bipolar Inputs

Data Sheet (Rev. 2) Product Selection Table
Viewing:

Overview

  • Single Supply +2.5V to +7.0V Operation
  • Measures Both Positive and Negative Input Voltages
  • Charge-Pump Voltage Inverter Generates a Negative Supply Voltage
  • Internal Bandgap Reference
  • On-Board Display Driver
  • Low Segment Current (MAX140)

The MAX138/MAX139 are 3 ½ digit A/D converters (ADCs) with on-board LCD (MAX138) and LED (MAX139) display drivers. The MAX138/MAX139 also contain a charge-pump voltage inverter. The charge-pump inverter allows the MAX138/MAX139 to measure both positive and negative input voltages while operating from a single power-supply voltage from +2.5V to +7V. The operating circuits of the MAX138/MAX139 are similar to those of the ICL7136 and ICL7137 respectively, except the MAX138/MAX139 have an internal oscillator and an external charge-pump capacitor connected to pins 38 and 40.

MAX140 is a low segment-current version of the MAX139 intended for use with low-current LED displays.

Applications

  • +3V Powered DMMs
  • +5V Powered Panel Meters
  • Digital Thermometers
  • Instruments
  • Portable Monitors
  • Weigh Scales
MAX140
3 1/2 Digit ADC with Reference, Charge Pump, and Direct LED Drivers
MAX138, MAX139, MAX140: Typical Operating Circuit
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 2

Learn More
Add to myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

Create New Project

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Latest Discussions

No discussions on MAX140 yet. Have something to say?

Start a Discussion on EngineerZone®

Recently Viewed