ICL7137CQH+D

ADCs/DACs - Special Purpose Overview

The ICL7137CQH+D is a low-power, 3 1/2 digit analog-to-digital converter (ADC) and LED display driver manufactured by Analog Devices Inc./Maxim Integrated. It integrates a dual-slope integrating ADC with a multiplexed decoder and driver for direct LED display interfacing. The component operates on a single power supply and features a PLCC-44 package suitable for surface-mount applications. Key electrical specifications include a maximum clock frequency of 48 kHz, a power dissipation rating of 800 mW, and a supply current of 1.8 mA. The device supports operation within an ambient temperature range of 0°C to +70°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 3 1/2 digit dual-slope A/D converter with direct LED display drive capability
• Low power consumption with a supply current of 1.8 mA and 800 mW power dissipation
• Surface-mount PLCC-44 package design for compact PCB integration
• Operates within a commercial temperature range of 0°C to +70°C

ADCs/DACs - Special Purpose Applications

• Digital panel meters requiring direct LED readouts
• Industrial process control instrumentation
• Battery-powered measurement devices due to low power profile

ADCs/DACs - Special Purpose Procurement Notes

The ICL7137CQH+D is listed as obsolete or end-of-life by the manufacturer. Availability is restricted, and sourcing may require checking secondary distributors for remaining stock. Verification of RoHS compliance and specific manufacturing date codes is recommended prior to procurement to ensure compatibility with current assembly standards.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a monolithic solution combining a 3 1/2 digit ADC and LED driver is required. Ensure the application utilizes a single power supply and operates within the 0°C to +70°C temperature range. Verify that the PLCC-44 footprint matches the target PCB layout. For higher resolution or LCD interfaces, consider alternative models in the ICL71xx series.

ADCs/DACs - Special Purpose Part Context

This part belongs to the ICL7137 family of integrating ADCs from Maxim Integrated, now part of Analog Devices. The 'C' suffix typically denotes the commercial temperature grade, while '+D' indicates the lead-free PLCC-44 package variant. It serves as a legacy component for cost-effective digital display systems before the widespread adoption of microcontroller-based driving methods.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements are limited due to the obsolete status. Review the ICL7135 or ICL7136 datasheets for similar functionality, noting differences in resolution (4 1/2 vs 3 1/2 digits) and interface requirements. Validate mechanical fit and electrical parameters against the original design specifications.