MAX134
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MAX134

3¾ Digit DMM Circuit

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Part Details
Part Models 6
1ku List Price Starting From $17.74
Features
  • 40,000 Count Resolution
  • 0.025% Accuracy
  • 20 Conversions per Second
  • Microprocessor Interface
  • 100µA Operating Supply Current
  • Low External Component Count
  • 5µV Resolution
  • Demonstration Kit Available MAX134/DEMO
Additional Details
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The MAX133 and MAX134 are integrating A/D converters for 3¾ digit multimeters and data acquisition systems such as data loggers and weigh scales. The A/D's internal resolution is ±40,000 counts. An extra digit is supplied as a guard digit to allow autozero or tare of a 4000 count displayed reading to 1/10 of a displayed count. The conversion time is 50ms.

The MAX133 and MAX134 differ only in their microprocessor interface. The MAX133 has a 4 bit multiplexed address/data bus while the MAX134 has 3 separate address lines and a 4 bit bidirectional data bus. Both devices can be used with 4, 8, and 16 bit microprocessors.

When controlled by a microprocessor, the MAX133 and MAX134 can perform auto-ranging measurements from ±400.0mV to ±4000V full scale. External attenuator resistors are required, but range switching is performed by the A/D.

The power supply is typically a 9V battery or ±5V. Operating current is typically 100µA while standby current is only 25µA.

Applications

  • Data Acquisition Systems
  • Data Loggers
  • Digital Panel Meters
  • Weigh Scales
Part Models 6
1ku List Price Starting From $17.74

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX134CMH+D
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MAX134CMH+TD
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MAX134CPL+
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MAX134CQH+D
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MAX134CQH+TD
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MAX134EPL+
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Product Lifecycle

PCN

May 21, 2018

- 1752

ASSEMBLY

MAX134CPL+

PRODUCTION

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Part Models

Product Lifecycle

PCN

May 21, 2018

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ASSEMBLY

MAX134CPL+

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX134EVKIT

Evaluation Kit for the MAX134

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MAX134EVKIT

Evaluation Kit for the MAX134

Evaluation Kit for the MAX134

Features and Benefits

  • Windows XP-, Windows Vista-, and Windows 7-Compatible Software
  • USB-PC Connection (Cable Included)
  • Powered by Three AA Batteries (Not Included)
  • Optional 9V Battery Operation
  • Measures Voltage and Resistance on Multiple Ranges (40V Max)
  • Measures Current on a Fixed 400mA Range
  • On-Board LCD Display of Conversion Results
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Detail

The MAX134 evaluation kit (EV kit) provides a proven design to evaluate the MAX134 3¾-digit digital multimeter. The EV kit measures volts, ohms, or milliamps, with conversion results displayed on a 4-digit LCD display. An on-board MAXQ2000 microcontroller controls the MAX134, the LCD display, and communicates with a PC over an optoisolated USB link. Software included with the EV kit demonstrates the features of the MAX134 and is provided as an aid in software development. In addition to the microcontroller code, the EV kit includes an application program compatible with Windows XP®, Windows Vista®, and Windows® 7. This program provides a graphical user interface (GUI) to control the MAX134 registers and view conversion results.

Warning: For safety reasons, the input voltage is limited to 40V (max). Be sure to read the information contained in the Multiple Grounds section.

Applications

  • Data Acquisition Systems
  • Data Loggers
  • Digital Panel Meters
  • Weigh Scales

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