General Description

The MAX1447/MAX1496/MAX1498 low-power, 3.5- and 4.5-digit, analog-to-digital converters (ADCs) with integrated light-emitting 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

Features

♦ High Resolution

   MAX1447/MAX1498: 4.5 Digits (±19,999 Count)

   MAX1496: 3.5 Digits (±1999 Count)

♦ Sigma-Delta ADC Architecture

   No Integrating Capacitors Required

   No Autozeroing Capacitors Required

   >100dB of Simultaneous 50Hz and 60Hz

   Rejection

♦ 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

♦ On-Demand Enhanced Offset Calibration

(MAX1447)

♦ Operate from a Single 2.7V to 5.25V Supply

♦ Low Power (Exclude LED-Driver Current)

   Maximum 744µA Operating Current (MAX1496)

   Maximum 960µA Operating Current

   (MAX1447/MAX1498)

   Maximum 325µA Shutdown Current

♦ Multiplexed Common-Cathode LED Drivers

   Resistor-Programmable Segment 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)

Applications

   Digital Panel Meters

   Hand-Held Meters

   Digital Voltmeters

   Digital Multimeters