MAX1447, MAX1496, MAX1498

3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers

Status

Active: In Production.

Description

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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. 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.

The MAX1447/MAX1498 are available in a 32-pin, 7mm x 7mm TQFP package and the MAX1496 is available in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the -40��C to +85��C extended temperature range.

Key Features		Applications/Uses
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)		Digital Multimeters Digital Panel Meters Digital Voltmeters Handheld meters