ICL7137CPL+

ADCs/DACs - Special Purpose Overview

The ICL7137CPL+ is a low-power, 3½-digit analog-to-digital converter (ADC) with an integrated LCD display driver. Manufactured by Analog Devices Inc./Maxim Integrated, it utilizes a dual-slope integrating architecture to achieve high accuracy and noise rejection. The device operates on a single power supply within the commercial temperature range of 0°C to +70°C. It features a direct interface for common-anode LCDs, eliminating the need for external multiplexing drivers. Key electrical specifications include a maximum clock frequency of 48 kHz, a maximum supply voltage of 9 V, and a typical supply current of 1.8 mA. The component is housed in a 40-pin Dual In-Line Package (PDIP).

ADCs/DACs - Special Purpose Feature Summary

• Integrated 3½-digit ADC with direct LCD segment driver capability.
• Dual-slope integration architecture providing inherent linearity and AC noise rejection.
• Low power consumption with a maximum supply current of 1.8 mA.
• Single-supply operation ranging from 9 V minimum to 9 V maximum.
• Commercial operating temperature range from 0°C to +70°C.

ADCs/DACs - Special Purpose Applications

• Digital panel meters requiring direct LCD readout.
• Battery-powered instrumentation due to low current draw.
• Industrial process control displays.
• Portable measurement devices.

ADCs/DACs - Special Purpose Procurement Notes

Verify RoHS compliance status, as legacy Maxim products may have varying environmental certifications depending on the manufacturing batch. Confirm package authenticity, as the PDIP-40 form factor is standard but older revisions may exist. Check for obsolescence notices or last-time buy notifications from Analog Devices, as this part number belongs to a mature product family that may be subject to discontinuation or replacement by newer series.

ADCs/DACs - Special Purpose Selection Notes

Select the ICL7137CPL+ when a complete ADC and display solution is required without external logic. Ensure the application uses a common-anode LCD compatible with the internal driver outputs. Verify that the input signal range matches the reference voltage configuration. For applications requiring LED displays, consider the ICL7116 or ICL7117 variants instead, as the ICL7137 is optimized for LCD interfaces.

ADCs/DACs - Special Purpose Part Context

The ICL7137 is part of the broader ICL71xx series of integrating ADCs, which are widely used in precision measurement applications. It serves as a successor to earlier CMOS ADC technologies, offering improved power efficiency and integration. The 'CPL' suffix denotes the commercial temperature grade and PDIP packaging. This component is often paired with precision references like the ICL8069 for stable metering systems.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users should consult Analog Devices official cross-reference guides for potential replacements such as the ICL7135 or ICL7126, noting differences in resolution and package type.