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

特性 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