MAX1499ECJ+

ADCs/DACs - Special Purpose Overview

The MAX1499ECJ+ is a 4.5-digit (±19,999 count) analog-to-digital converter with integrated LED drivers and microcontroller interface. It operates from a single 2.7V to 5.25V supply and features sigma-delta architecture with >100dB simultaneous 50Hz/60Hz rejection. Key electrical parameters include ±2V or ±200mV selectable input ranges, an internal 2.048V reference, and maximum operating currents of 664µA (excluding LED driver). The device provides SPI/QSPI/MICROWIRE compatibility and functions within the -40°C to +85°C temperature range.

ADCs/DACs - Special Purpose Feature Summary

• 4.5-Digit Resolution: Provides ±19,999 count output for high-precision measurements.
• Integrated LED Drivers: Multiplexed segment/digit drivers with resistor-programmable current.
• Sigma-Delta Architecture: Eliminates need for external integrating/autozero capacitors.
• Low Power Consumption: Maximum 664µA operating current and 268µA shutdown current.

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the ECJ suffix corresponds to the 32-pin TQFP package and -40°C to +85°C extended temperature range. Confirm the '+' suffix indicates lead-free compliance per RoHS standards. Ensure ordering documentation matches the specific pinout and electrical characteristics defined in the official Analog Devices datasheet.

ADCs/DACs - Special Purpose Selection Notes

Select the MAX1499ECJ+ when 4.5-digit resolution is required compared to the 3.5-digit MAX1497. Choose this component for designs needing integrated LED display driving to reduce external component count. Verify that the application requires the specific ±2V or ±200mV input ranges supported by this ADC architecture.

ADCs/DACs - Special Purpose Part Context

This part belongs to the MAX1497/MAX1499 family of low-power, single-chip ADCs. While the MAX1497 offers 3.5-digit resolution in 28-pin packages, the MAX1499 provides enhanced 4.5-digit precision in a 32-pin TQFP format. Both share identical core functionalities including internal references, charge pumps, and serial interfaces.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Designers should consult official Analog Devices resources for cross-reference information regarding compatible replacement components.

ADCs/DACs - Special Purpose FAQ

What is the maximum conversion rate of the MAX1499?

The MAX1499 operates at a conversion rate of 5 Hz using either the internal oscillator or an external 4.9152 MHz clock.

Does the MAX1499 require external precision capacitors?

No, the device does not require external precision integrating capacitors, autozero capacitors, crystal oscillators, or charge pumps due to its fully integrated design.

How is the segment current for the LED drivers configured?

The segment current is resistor-programmable via the ISET pin. Connecting a resistor to ground sets the current level as detailed in the datasheet's Table 6.