MAX138EQH

ADCs/DACs - Special Purpose Overview

The MAX138EQH is a specialized LCD driver integrated circuit manufactured by Analog Devices Inc. (Maxim Integrated). It incorporates a 3 1/2 digit analog-to-digital converter (ADC) with an internal reference and charge pump, designed for direct interface with liquid crystal displays. The device operates on a single power supply ranging from 2.5 V to 7 V. It features a low power dissipation of 889 mW and supports surface-mount installation in an MQFP-44 package. The component functions within a commercial temperature range of 0°C to +70°C, providing a compact solution for multi-digit display applications requiring high accuracy and minimal external components.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 3 1/2 digit ADC with built-in reference voltage
• Internal charge pump eliminates need for external negative voltage generation
• Single-supply operation between 2.5 V and 7 V
• MQFP-44 surface-mount package for space-constrained designs

ADCs/DACs - Special Purpose Applications

• Digital panel meters
• Portable instrumentation displays
• Industrial control interfaces

ADCs/DACs - Special Purpose Part Context

The MAX138EQH belongs to the MAX138 family of LCD drivers. This series is characterized by its integration of delta-sigma ADC technology, which replaces traditional integrating ADCs in panel meter designs. The 'E' suffix typically denotes the commercial temperature grade (0°C to +70°C), while 'QH' indicates the MQFP-44 package type. This specific part number represents a variant optimized for standard industrial environments rather than extended or military temperature ranges.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers for the MAX138EQH are not available in the provided documentation. Designers should consult official Analog Devices cross-reference tools or datasheets for compatible alternatives, as pinouts and electrical characteristics may vary significantly between different LCD driver families.