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.
MAX1492、MAX1494:標準動作回路 MAX1492、MAX1494:標準動作回路 拡大表示+


  • 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)


  • デジタルマルチメータ
  • デジタルパネルメータ
  • デジタル電圧計
  • ハンドヘルド各種メータ

スペックパラメータを参照する: Display-Oriented ADCs (27)

Part NumberResolution
Conv. Rate
Data BusDiff/S.E. InputInternal VREF
External VREF
External VREF
Bipolar VIN
(max)(nominal)(min)(max)(max)(See Notes)
MAX1494 200000.00257-SegmentDiff. Only2.04802.04821
$10.82 @1k


MAX1494EVKIT: MAX1493、MAX1494、およびMAX1495の評価キット/評価システム
信頼性レポートをリクエスト: MAX1494 
デバイス   ウェハープロセス   プロセス技術   サンプルサイズ   不合格   FIT (25°C)   FIT (55°C)   Material Composition  

注: 不良率はプロセス技術ごとにまとめられ、関連する型番にマッピングされます。 不良率はテストされたユニット数に大きく依存します。

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種類 ID タイトル
評価ボード4214MAX1494EVKIT MAX1493MAX1494、およびMAX1495の評価キット/評価システム