MAX1491
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MAX1491

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

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

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 1
1ku List Price Starting From $7.19
Features
  • High Resolution
    • MAX1495: 4.5 Digits (±19,999 Count)
    • MAX1493: 4.5 Digits (±19,999 Count)
    • MAX1491: 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 980µA Operating Current
  • Small 32-Pin 7mm x 7mm TQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits), and 28-Pin DIP Package (3.5 Digits)
  • Triplexed LCD Driver
  • Evaluation Kit Available (Order MAX1494EVKIT)
Additional Details
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The MAX1491/MAX1493/MAX1495 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 ADC is configurable for either a ±2V or ±200mV input range and it outputs its conversion results to an LCD. The MAX1491 is a 3.5-digit (±1999 count) device, and the MAX1493/MAX1495 are 4.5-digit (±19,999 count) devices.

The MAX1491/MAX1493/MAX1495 do not require external-precision integrating or auto-zero 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, the MAX1491/MAX1493/MAX1495 use continuous internal offset calibration, and offer >100dB rejection of 50Hz and 60Hz line noise. The MAX1493/MAX1495 perform enhanced offset calibration at power-up. The MAX1495 also performs enhanced calibration on demand. Other features include data hold and peak hold, and a user programmable low-battery monitor.

The MAX1493/MAX1495 come in a 32-pin 7mm x 7mm TQFP package, and the MAX1491 comes in 28-pin SSOP and 28-pin DIP 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
Part Models 1
1ku List Price Starting From $7.19

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX1491CAI+
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  • HTML
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX1493EVKIT

Evaluation Kit for the MAX1493 and MAX1495

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MAX1493EVKIT

Evaluation Kit for the MAX1493 and MAX1495

Evaluation Kit for the MAX1493 and MAX1495

Features and Benefits

  • Reference Design
  • Proven PCB Layout
  • Complete Evaluation System
  • Convenient On-Board Test Points
  • Fully Assembled and Tested

Product Detail

The MAX1493 is a low-power, 4.5-digit analog-to-digital converter (ADC) with integrated liquid-crystal display (LCD) drivers.

The MAX1493 evaluation kit (EV kit) provides a proven printed-circuit board (PCB) layout to facilitate evaluation of the MAX1493 IC. Connect the 4V to 28V DC and ground return to terminal block TB1 (see Figure 1 in the full data sheet).

The EV kit is not a complete digital voltmeter (DVM); additional input scaling and protection circuitry might be required.

This EV kit can also evaluate the MAX1495CCJ+. Contact the factory for free samples. See the Evaluating the MAX1495 section in the full data sheet for additional information.

Applications

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

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