Maxim Integrated MAX1492CNI

Description
The MAX1492/MAX1494 are low-power, 3.5- and 4.5-digit analog-to-digital converters (ADCs) with integrated liquid crystal display (LCD) drivers. They operate from a single 2.7V to 5.25V power supply and 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 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.

Features
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 TQFP 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)

Applications
Digital Panel Meters
Hand-Held Meters
Digital Voltmeters
Digital Multimeters