General Description

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.

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 ✕ 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)

Applications

Digital Panel Meters

Hand-Held Meters

Digital Voltmeters

Digital Multimeters