Maxim Integrated MAX1499ECJ

Description
The MAX1497/MAX1499 are low-power, 3.5- and 4.5-digit analog-to-digital converters (ADCs) with integrated light-emitting diode (LED) drivers and a microcontroller (μC) interface. 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 multiplexed LED display driver. An internal charge pump generates the negative supply needed to power the integrated input buffers for single-supply operation. The ADC is configurable for either a ±2V or ±200mV input range and outputs its conversion results to an LED and/or to a μC. Microcontroller communication is possible through an SPI™-/QSPI/MICROWIRE™-compatible serial interface. The MAX1497 is a 3.5-digit (1999 count) device and the MAX1499 is a 4.5-digit (a 19,999 count) device.

Features
MAX1499: 4.5 Digits (±19,999 Count)
MAX1497: 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 (Exclude LED Driver Current)
Maximum 664μA Operating Current
Maximum 268μA Shutdown 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)
Multiplexed LED Drivers
Resistor-Programmable Segment Current
SPI-/QSPI-/MICROWIRE-Compatible Serial Interface
Extended Temperature Range (-40°C to 85°C)

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