Maxim Integrated MAX1498ECJ

Description
The MAX1447/MAX1496/MAX1498 are low-power, 3.5- and 4.5-digit analog-to-digital converters (ADCs) with integrated light-emitting diode (LED) 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 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 it outputs its conversion results to an LED. The MAX1496 is a 3.5-digit (1999 count) device and the MAX1447/MAX1498 are 4.5-digit ( 19,999 count) devices.
The MAX1447/MAX1496/MAX1498 do not require external precision integrating capacitors, autozero capacitors, crystal oscillators, charge pumps, or other circuitry required with dual-slope ADCs (commonly used in panel meter circuits).
These devices also feature on-chip buffers for the differential signal and reference input, allowing direct interface with high-impedance signal sources. In addition, they use continuous internal offset-calibration and offer >100dB rejection of 50Hz and 60Hz line noise.
Other features include data hold and peak detection and overrange/underrange detection. The MAX1447 features on-demand enhanced offset calibration for improved offset performance.

Features
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 2200mV 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