MAX1447ECJ+

ADCs/DACs - Special Purpose Overview

The MAX1447ECJ+ is a low-power, single-chip analog-to-digital converter (ADC) with integrated LED drivers. It provides 4.5-digit resolution (±19,999 counts) using sigma-delta architecture. The device operates from a single 2.7V to 5.25V supply and includes an internal 2.048V reference, high-accuracy oscillator, and charge pump for negative buffer supply. It features selectable ±2V or ±200mV input ranges, on-chip buffers for high-impedance sources, and >100dB rejection of 50Hz/60Hz line noise. The part is housed in a 32-pin TQFP package.

ADCs/DACs - Special Purpose Feature Summary

• 4.5-Digit Resolution: Provides ±19,999 count output capability.
• Integrated LED Driver: Multiplexed common-cathode driver with resistor-programmable segment current.
• High Noise Rejection: Offers >100dB simultaneous rejection of 50Hz and 60Hz line noise via SINC4 digital filter.
• Low Power Consumption: Maximum operating current is 960µA; shutdown current is 325µA.

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify component authenticity through authorized distributors. Confirm the specific ECJ suffix corresponds to the 32-pin TQFP package variant. Check for RoHS compliance documentation as indicated in manufacturer records. Ensure availability status is current, as lifecycle status may change.

ADCs/DACs - Special Purpose Selection Notes

Select this model for applications requiring 4.5-digit precision with direct LED display output. Choose the ±200mV range for high-resolution small signal measurement or ±2V for general voltage monitoring. Ensure the design supports the required 2.7V to 5.25V supply rails and accommodates the 32-pin TQFP footprint.

ADCs/DACs - Special Purpose Part Context

This component belongs to the MAX1447/MAX1496/MAX1498 family of single-chip ADCs with LED drivers. While the MAX1496 offers 3.5-digit resolution in smaller packages, the MAX1447 provides higher 4.5-digit resolution in the 32-pin TQFP form factor. The MAX1498 shares similar specifications but may differ in specific pinout or feature sets compared to the MAX1447.

ADCs/DACs - Special Purpose Replacement Considerations

Direct replacements within the same family include the MAX1498ECJ for equivalent 4.5-digit performance. For lower resolution needs, the MAX1496EAI+ (SSOP) or MAX1496EPI+ (PDIP) are available alternatives. Verify pin compatibility and software register configurations when substituting.

ADCs/DACs - Special Purpose FAQ

What is the maximum operating current for the MAX1447ECJ+?

The maximum operating current is 960µA, excluding LED driver current.

Does the MAX1447ECJ+ require external integrating capacitors?

No, the device does not require external precision integrating capacitors, autozero capacitors, or crystal oscillators due to its integrated sigma-delta architecture and internal components.

How is the segment current for the LED driver configured?

The segment current is resistor-programmable by connecting a resistor between the ISET pin and ground.