ICL7106C/D

ADCs/DACs - Special Purpose Overview

The ICL7106 and ICL7107 are monolithic 3½-digit analog-to-digital converters (ADCs) featuring high input impedance and integrated display drive capabilities. The ICL7106 directly drives non-multiplexed LCDs using a single supply, while the ICL7107 drives common-anode LED displays requiring dual supplies. Both devices incorporate polarity drivers, segment decoders, voltage references, and clock circuits on-chip. Utilizing dual-slope conversion with a zero-integrator phase, they eliminate overrange hangover and hysteresis. Key electrical characteristics include low noise (<15µV P-P), true differential inputs, rollover error <1 count, and zero reading drift <1µV/°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated Display Drive: Eliminates external circuitry; ICL7106 for LCD, ICL7107 for LED.
• High Accuracy: Rollover error less than one count; guaranteed first reading recovery from overrange.
• Low Noise & Drift: Noise <15µV P-P; zero reading drift <1µV/°C.
• True Differential Inputs: Supports ratiometric measurements for bridge transducers.

ADCs/DACs - Special Purpose Applications

• Digital Panel Meters
• Precision Null Detection
• Bridge Transducer Measurement

ADCs/DACs - Special Purpose Procurement Notes

Verify package type and suffix when ordering. The datasheet lists PDIP and PLCC packages. Suffixes such as '+' indicate RoHS compliance. Confirm temperature range requirements, as standard parts operate from 0°C to +70°C. Check current availability status as older CMOS technologies may have limited stock or end-of-life statuses.

ADCs/DACs - Special Purpose Selection Notes

Select ICL7106 for LCD applications with single-supply operation. Select ICL7107 for LED applications requiring dual supplies (+5V/-9V). Ensure the design accommodates the specific pin configurations for the chosen package (PDIP-40 or PLCC-44). Verify that the application benefits from the true differential input architecture for noise rejection in industrial environments.

ADCs/DACs - Special Purpose Part Context

These components are classic 3½-digit ADCs widely used in digital multimeters and panel meters. They represent a mature CMOS technology offering high accuracy at low power. The ICL7106/7107 series is known for its simplicity, requiring minimal external passive components to function as a complete measurement system.

ADCs/DACs - Special Purpose Replacement Considerations

The datasheet mentions an 'Improved 2nd Source' available at no additional cost with tighter test specifications. Direct pin-compatible replacements should be verified against the specific package code (P40+1 for PDIP, Q44+1 for PLCC) and electrical limits provided in the official documentation.

ADCs/DACs - Special Purpose FAQ

How does the ICL7106 differ from the ICL7107?

The ICL7106 is designed to directly drive non-multiplexed LCD displays and typically uses a single supply. The ICL7107 drives common-anode LED displays and requires dual supplies (V+ and V-).

What is the maximum noise level specified?

The peak-to-peak noise is specified as less than 15µV, measured at 0V input with a full scale of 200mV.

Does the device suffer from overrange hangover?

No. Maxim added a zero-integrator phase to the ICL7106 and ICL7107 to eliminate overrange hangover and hysteresis effects.