ICL7117CPL

ADCs/DACs - Special Purpose Overview

The ICL7117CPL is a 3½ digit monolithic analog-to-digital converter (ADC) designed to directly drive LED displays. It utilizes a dual-slope integrating architecture with on-chip clock and reference circuits, eliminating the need for external components. The device features high-impedance CMOS differential inputs and a dedicated Hold pin that allows indefinite freezing of the display reading. Key electrical specifications include a maximum power dissipation of 800mW in the plastic package, a supply current of up to 1.8mA, and an operating temperature range from 0°C to +70°C.

ADCs/DACs - Special Purpose Feature Summary

• Direct LED Display Drive: On-board capability drives LED segments without requiring external circuitry.
• Display Hold Function: A digital input pin freezes the display reading indefinitely while conversions continue internally.
• Dual-Slope Integration: Auto-rejects interference signals common in industrial environments.
• High Accuracy: Features rollover error less than one count and zero reading drift under 1µV/ºC.

ADCs/DACs - Special Purpose Applications

• Digital panel meters
• Voltage measurement systems
• Resistance and bridge transducer measurements
• Temperature monitoring devices

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm package type and temperature rating. The CPL suffix indicates a 40-pin Plastic Dual In-Line Package (PDIP). Confirm RoHS compliance status and lead-free requirements prior to procurement. Ensure the component meets the required environmental operating conditions for the target application.

ADCs/DACs - Special Purpose Selection Notes

Select the ICL7117CPL when direct LED display driving is required, as opposed to the ICL7116 which is intended for LCDs. Verify that the application requires a 3½ digit resolution and a full-scale input range compatible with the internal reference. Ensure the design accommodates the single-supply voltage requirements (+6V to +9V typically) and the specific segment sinking current capabilities of the PDIP package.

ADCs/DACs - Special Purpose Part Context

This component belongs to the Maxim ICL7116/ICL7117 family of 3½ digit ADCs. It is functionally similar to the ICL7106/ICL7107 but includes an added Hold pin for display freezing. The ICL7117 variant specifically targets LED display applications, whereas the ICL7116 targets LCDs. Both share the same core integrating ADC architecture and pinout compatibility within their respective display types.

ADCs/DACs - Special Purpose Replacement Considerations

The ICL7116CPL serves as a functional substitute if the application utilizes an LCD instead of an LED display, maintaining identical ADC performance and pinout. Other integrating ADCs may require significant circuit redesign due to differences in display drive capabilities and reference configurations.

ADCs/DACs - Special Purpose FAQ

How does the Hold pin function on the ICL7117?

The Hold pin is a digital input that inhibits the display latch pulse when connected to V+. This freezes the displayed reading indefinitely while the ADC continues to perform conversions internally. If left open, it pulls low via an internal resistor, allowing continuous updates.

What is the maximum power dissipation for the ICL7117CPL?

The maximum power dissipation for the ICL7117CPL in the plastic package is 800mW.

Does the ICL7117 require external clock or reference components?

No, the ICL7117 has both the clock oscillator and the reference voltage generated on-chip, eliminating the need for these external components.