MAX1492
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MAX1492

3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

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Part Details
Features
  • High Resolution
    • MAX1494: 4.5 Digits (±19,999 Count)
    • MAX1492: 3.5 Digits (±1999 Count)
  • Sigma-Delta ADC Architecture
    • No Integrating Capacitors Required
    • No Autozeroing Capacitors Required
    • > 100dB of Simultaneous 50Hz and 60Hz Rejection
  • Operate from a Single 2.7V or 5.25V Supply
  • Selectable Input Range of ±200mV or ±2V
  • Selectable Voltage Reference: Internal 2.048V or External
  • Internal High-Accuracy Oscillator Needs No External Components
  • Automatic Offset Calibration
  • Low Power
    • Maximum 960µA Operating Current
    • Maximum 400µA Shutdown Current
  • Small 32-Pin 7mm x 7mm LQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits)
  • Triplexed LCD Driver
  • SPI-/QSPI-/MICROWIRE-Compatible Serial Interface
  • Evaluation Kit Available (Order MAX1494EVKIT)
Additional Details
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The MAX1492/MAX1494 low-power, 3.5- and 4.5-digit, analog-to-digital converters (ADCs) with integrated liquid crystal display (LCD) drivers operate from a single 2.7V to 5.25V power supply. They include an internal reference, a high-accuracy on-chip oscillator, and a triplexed LCD driver. An internal charge pump generates the negative supply needed to power the integrated input buffer for single-supply operation. The ADCs are configurable for either a ±2V or ±200mV input range and outputs its conversion results to an LCD and/or to a microcontroller (µC). µC communication is facilitated through an SPI™-/QSPI™-/MICROWIRE®-compatible serial interface. The MAX1492 is a 3.5-digit (±1999 count) device, and the MAX1494 is a 4.5-digit (±19,999 count) device.

The MAX1492/MAX1494 do not require external-precision integrating capacitors, autozero capacitors, crystal oscillators, charge pumps, or other circuitry required with dual-slope ADCs (commonly used in panel meter circuits).

These devices also feature on-chip buffers for the differential signal and reference inputs, allowing direct interface with high-impedance signal sources. In addition, they use continuous internal-offset calibration and offer > 100dB simultaneous rejection of 50Hz and 60Hz line noise. Other features include data hold and peak hold, overrange and underrange detection, and a low-battery monitor.

The MAX1494 comes in a 32-pin, 7mm x 7mm LQFP package, and the MAX1492 comes in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the 0°C to +70°C commercial temperature range.

Applications

  • Digital Multimeters
  • Digital Panel Meters
  • Digital Voltmeters
  • Handheld meters

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX1494EVKIT

Evaluation Kit/Evaluation System for the MAX1493, MAX1494, and MAX1495

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MAX1494EVKIT

Evaluation Kit/Evaluation System for the MAX1493, MAX1494, and MAX1495

Evaluation Kit/Evaluation System for the MAX1493, MAX1494, and MAX1495

Features and Benefits

  • Proven PC Board Layout
  • Complete Evaluation System
  • Convenient On-Board Test Points
  • Data-Logging Software
  • Fully Assembled and Tested

Product Detail

The MAX1494 evaluation system (EV system) consists of a MAX1494 evaluation kit (EV kit) and a Maxim 68HC16MODULE-DIP microcontroller (µC) module. The MAX1494 is a low-power, 4.5-digit, analog-to-digital converter (ADC) with integrated liquid crystal display (LCD) drivers. The evaluation software runs under Windows® 95/98/2000/XP, providing a user interface to exercise the features of the MAX1494.

Order the complete EV system (MAX1494EVC16) for a comprehensive evaluation of the MAX1494 using a personal computer. Order the EV kit (MAX1494EVKIT) if the 68HC16MODULE-DIP module has been purchased with a previous Maxim EV system, or for custom use in other µC-based systems.

This system can also evaluate the MAX1493CCJ and MAX1495CCJ. Contact the factory for free samples of these products. See the Detailed Description of Hardware section.

Applications

  • Digital Multimeters
  • Digital Panel Meters
  • Digital Voltmeters
  • Handheld meters

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