MAX139EPL+

ADCs/DACs - Special Purpose Overview

The MAX139EPL+ is a monolithic integrated circuit functioning as a 3 1/2-digit analog-to-digital converter (ADC) with an internal reference and charge pump. It utilizes a dual-slope integration architecture to achieve high precision, specified with a maximum linearity error of 0.0015%. The device operates on a single power supply ranging from 2.5 V to 7 V and includes direct LED driver outputs for display applications. It is housed in a 40-pin Plastic Dual In-Line Package (PDIP-40) and supports operation across an industrial temperature range of -40°C to +85°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 3 1/2-digit ADC with dual-slope conversion architecture
• Internal voltage reference and charge pump for external capacitor drive
• Direct LED driver outputs eliminating external transistor requirements
• High accuracy with 0.0015% maximum linearity error

ADCs/DACs - Special Purpose Applications

• Precision digital panel meters
• Industrial process control instrumentation
• Portable battery-powered measurement devices
• Weight scales and force measurement systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'EPL+' against the manufacturer's current product status, as availability may be restricted or subject to change. Confirm that the PDIP-40 through-hole package aligns with the target PCB design constraints. Ensure compliance with RoHS directives if required by the end application. Cross-reference the datasheet revision date to confirm pinout and electrical parameter consistency with existing designs.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a complete solution for driving LED displays without external multiplexing transistors is required. The internal charge pump simplifies design by removing the need for external clock generation circuits. Compare the 0.0015% linearity specification against system accuracy requirements. Consider the PDIP-40 package size relative to board space limitations compared to surface-mount alternatives like the MQFP-44 variant.

ADCs/DACs - Special Purpose Part Context

The MAX139 belongs to a family of integrating ADCs designed specifically for low-cost, high-accuracy measurement systems. It integrates functions typically requiring multiple discrete components, including the ADC core, reference, and display drivers. This integration reduces bill-of-materials count and simplifies layout for applications demanding stable DC measurements over varying environmental conditions.

ADCs/DACs - Special Purpose Replacement Considerations

The MAX140EPL+ serves as a functional equivalent within the same series, offering similar 3 1/2-digit ADC capabilities with direct LED drivers. Verify pin compatibility and specific electrical tolerances before substitution. Other variants such as the MAX138CMH+ provide LCD driver options but differ in output interface and package type.