ICL7106CPL+

ADCs/DACs - Special Purpose Overview

The ICL7106CPL+ is a monolithic 3½-digit analog-to-digital converter (ADC) manufactured by Analog Devices Inc./Maxim Integrated. It utilizes dual-slope integration to reject industrial interference and features high-impedance CMOS differential inputs. The device integrates polarity drivers, segment decoders, a voltage reference, and a clock circuit, enabling direct drive of non-multiplexed LCDs without external display circuitry. Key electrical specifications include a maximum clock frequency of 48 kHz, a power supply range of 9 V, and a maximum supply current of 1.8 mA. It operates within a temperature range of 0°C to +70°C and is housed in a 40-pin PDIP package.

ADCs/DACs - Special Purpose Feature Summary

• Direct LCD Drive Capability: On-board active components eliminate the need for external display driver circuitry.
• Dual-Slope Conversion: Automatically rejects common-mode interference signals typical in industrial environments.
• Integrated Circuitry: Includes polarity/digit drivers, segment decoders, voltage reference, and clock circuit on-chip.
• High Accuracy: Features zero-integrator phase to eliminate overrange hangover and hysteresis effects.

ADCs/DACs - Special Purpose Applications

• Digital panel meters
• Portable pressure gauges
• Precision null applications

ADCs/DACs - Special Purpose Procurement Notes

Verify that the component is the lead-free/RoHS-compliant version indicated by the '+' suffix. Confirm the package type is 40-pin PDIP and the operating temperature range matches the design requirements of 0°C to +70°C. Ensure the application uses a non-multiplexed LCD interface compatible with the ICL7106's specific drive voltages.

ADCs/DACs - Special Purpose Selection Notes

Select the ICL7106CPL+ when a direct LCD interface is required, as opposed to the ICL7107 which drives LED displays. Verify that the system can accommodate a 9V single supply and that the input impedance requirements are met by the CMOS differential inputs. Consider the 48 kHz maximum clock frequency when designing the timing constraints for the conversion cycle.

ADCs/DACs - Special Purpose Part Context

This component belongs to the ICL7106/ICL7107 family of 3½-digit A/D converters. The 'CPL' suffix denotes the commercial temperature range (0°C to +70°C) and the 40-pin PDIP package format. The '+' indicates compliance with RoHS standards. It serves as a second-source upgrade from Intersil/Harris devices under the Maxim Advantage program.

ADCs/DACs - Special Purpose Replacement Considerations

The ICL7107CPL+ is a functional substitute if an LED display interface is acceptable instead of LCD. Other variants in the series include the ICL7106CQH+ in a 44-pin PLCC package.

ADCs/DACs - Special Purpose FAQ

Does the ICL7106 require external components for display driving?

No, the ICL7106 includes on-board polarity and digit drivers, segment decoders, and voltage references, allowing it to directly drive a non-multiplexed LCD without external circuitry.

What is the purpose of the zero-integrator phase in this device?

The zero-integrator phase eliminates overrange hangover and hysteresis effects, ensuring accurate readings during conversion cycles.

How does the ICL7106 handle noise rejection?

It uses a dual-slope conversion technique that automatically rejects interference signals common in industrial environments, with a guaranteed peak-to-peak noise level of less than 15µV.