3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and µC Interface

Show More showmore-icon

3.5- and 4.5-Digit ADC, LED Display Drivers Reduce Time and Save Board Space

Part Details
  • High Resolution
    • MAX1499: 4.5 Digits (±19,999 Count)
    • MAX1497: 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 (Exclude LED Driver Current)
    • Maximum 664µA Operating Current
    • Maximum 268µA Shutdown Current
  • Small 32-Pin, 7mm x 7mm TQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits)
  • Also Available in a PDIP Package (3.5 Digits)
  • Multiplexed LED Drivers Resistor-Programmable Segment Current
  • SPI-/QSPI-/MICROWIRE-Compatible Serial Interface
  • Extended Temperature Range (-40°C to +85°C)
Additional Details
show more Icon

The MAX1497/MAX1499 low-power, 3.5- and 4.5-digit, analog-to-digital converters (ADCs) with integrated lightemitting diode (LED) 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 multiplexed LED display driver. An internal charge pump generates the negative supply needed to power the integrated input buffers for single-supply operation. The ADC is configurable for either a ±2V or ±200mV input range and it outputs its conversion results to an LED and/or to a microcontroller (µC). Microcontroller communication is possible through an SPI™-/QSPI™- /MICROWIRE™-compatible serial interface. The MAX1497 is a 3.5-digit (±1999 count) device and the MAX1499 is a 4.5-digit (±19,999 count) device.

The MAX1497/MAX1499 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 rejection of 50Hz and 60Hz line noise. Other features include data hold and peak detection, overrange and underrange detection, and a user-programmable low-battery monitor.

The MAX1499 is available in a 32-pin, 7mm x 7mm TQFP package and the MAX1497 is available in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the -40°C to +85°C extended temperature range.


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

close icon
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1


Evaluation Kit/Evaluation System for the MAX1499



Evaluation Kit/Evaluation System for the MAX1499

Evaluation Kit/Evaluation System for the MAX1499

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 MAX1499 evaluation system (EV system) consists of a MAX1499 evaluation kit (EV kit) and a Maxim 68HC16MODULE-DIP microcontroller (µC) module. The MAX1499 is a low-power, 4.5-digit analog-to-digital converter (ADC) with integrated LED display drivers. The evaluation software runs under Windows® 95/98/2000/XP, providing a convenient user interface for exercising the features of the MAX1499.

Order the complete EV system (MAX1499EVC16) for a comprehensive evaluation of the MAX1499 using a personal computer. Order the EV kit (MAX1499EVKIT) if the 68HC16MODULE has already been purchased with a previous Maxim EV system, or for custom use in other µC-based systems.

This system can also evaluate the MAX1498ECJ. Contact factory for free samples. See the Detailed Description of Hardware section for more details.


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

Recently Viewed