ICL7611DCSA+

Overview

The ICL7611DCSA+ is a single-channel monolithic CMOS operational amplifier manufactured by Analog Devices Inc. (Maxim Integrated). It features an ultra-low input bias current of 1pA typical and operates from ±1V to ±8V dual supplies or 2V to 16V single supplies. The device offers pin-selectable quiescent currents of 10μA, 100μA, or 1000μA for the ICL761X family, though this specific part typically utilizes fixed settings. It provides rail-to-rail output swing within millivolts of the supply rails, a unity-gain bandwidth of 44kHz at 10μA, and an input resistance of 10^12Ω.

Feature Summary

• Ultra-low input bias current of 1pA typical with high input impedance
• Programmable quiescent current selection via external pin connection
• Rail-to-rail output voltage swing capability
• Internal frequency compensation for stable unity-gain operation

Applications

• Long time constant integrators
• Picoammeters
• Low droop rate sample/hold amplifiers
• pH meters and photodiode amplifiers

Procurement Notes

Verify the exact ordering suffix against the manufacturer's official datasheet to confirm temperature range and package specifications. Confirm RoHS compliance status as indicated in the latest documentation. Ensure the component matches the intended application requirements regarding quiescent current configuration and supply voltage limits before procurement.

Selection Notes

Select this component for applications requiring minimal input bias current and low power consumption. The wide supply voltage range supports both battery-powered and standard logic systems. Consider the trade-off between quiescent current settings and bandwidth/slew rate performance when configuring the IQ pin for optimal circuit behavior.

Part Context

This part belongs to the ICL761X–ICL764X family of monolithic CMOS operational amplifiers. The family combines ultra-low input current with low-power operation over a wide supply voltage range. The ICL7611 specifically denotes a single-channel amplifier within this series, designed for precision analog signal processing where input leakage must be minimized.

Replacement Considerations

The datasheet lists the ICL7611ACPA+ and ICL7611BCPA+ as compatible variants within the same family. These alternatives share identical pinouts and core functionality but differ in input offset voltage specifications and operating temperature ranges.