ICL7126CPLZ

ADCs/DACs - Special Purpose Overview

The ICL7126CPLZ is a high-performance, low-power 3.5-digit analog-to-digital converter (ADC) manufactured by Renesas Electronics Corporation. It utilizes a dual-slope integration architecture and features true differential input and reference capabilities. The device integrates seven-segment decoders, display drivers, an internal clock, and a voltage reference on a single CMOS chip. Designed for direct interface with liquid crystal displays (LCDs), it includes multiplexed backplane drive functionality. Key electrical characteristics include a maximum supply voltage of 6V, an operating temperature range from 0°C to +70°C, and a typical input bias current of 1pA. The component is housed in a 40-pin PDIP package.

ADCs/DACs - Special Purpose Feature Summary

• 3.5-digit resolution with guaranteed zero reading for 0V input on all scales
• True differential input and reference for precise measurement of bridge-type transducers
• Integrated LCD driver with multiplexed backplane drive requiring no external active components
• Low power dissipation typically less than 10mW with supply current of 100µA

ADCs/DACs - Special Purpose Applications

• High-accuracy panel meters and digital multimeters
• Measurement systems utilizing load cells and strain gauges
• Battery-operated instrumentation due to low power consumption
• Precision null detection applications requiring true polarity at zero

ADCs/DACs - Special Purpose Procurement Notes

Verify the manufacturer designation as Renesas Electronics Corporation, noting historical lineage from Intersil. Confirm the specific suffix 'CPLZ' corresponds to the commercial temperature range (0°C to +70°C) and lead-free RoHS compliance. Check current availability status as distribution channels may list this component as obsolete or last-time buy depending on regional inventory. Ensure the 40-pin PDIP package matches the target PCB footprint requirements.

ADCs/DACs - Special Purpose Selection Notes

Select the ICL7126CPLZ when a complete ADC solution with integrated LCD driving is required without additional active circuitry. This component is suitable for designs needing true differential inputs to reject common-mode noise in sensor interfaces. Compare against the ICL7106 if LED display driving is needed instead of LCD, or if higher digit resolution such as 4.5 digits is required. Verify that the 6V maximum supply voltage aligns with the system power budget.

ADCs/DACs - Special Purpose Part Context

The ICL7126 belongs to the ICL71xx series of 3.5-digit A/D converters, which are widely recognized for their economy and versatility in building high-performance panel meters. It serves as a plug-in replacement for earlier generations like the ICL7106, primarily differing in power consumption and display interface optimization. The device represents a standard CMOS technology implementation for low-speed, high-precision DC voltage measurements in industrial and laboratory equipment.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly documented pin-compatible replacements include the TC7126CPL from Microchip Technology. Other variants within the same family, such as the ICL7106, require changes to passive components and display type. Verify functional equivalence regarding auto-zero accuracy and rollover error specifications before substitution.