The MAX1447ECJ+ from Maxim Integrated Products is a 4.5digit, single chip ADC with LED driver in 32 pin LQFP package. It includes 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 MAX1447 do not require external precision integrating capacitors, autozero capacitors, crystal oscillators, charge pumps or other circuitry required with dual-slope ADCs. It also feature on-chip buffers for differential signal and reference input allowing direct interface with high-impedance signal sources. It uses continuous internal offset-calibration and offer >100dB rejection of 50Hz and 60Hz line noise. It is used in digital panel meters, hand-held meters, digital voltmeters and digital mustimeters.
Single 2.7V to 5.25V power supply
High ±19,999 count resolution
Selectable internal 2.048V or external voltage reference
Internal high-accuracy oscillator needs no external components
Automatic offset calibration
Includes data hold and peak detection and overrange/underrange detection
Maximum 325µA shutdown current
Multiplexed common cathode LED drivers
On-demand enhanced offset calibration for improved offset performance
Operating temperature range from -40°C to 85°C
Digital Multimeters; Digital Panel Meters; Digital Voltmeters; Handheld meters
