ICL7611DCSA

Overview

The ICL7611DCSA+ is a single-channel monolithic CMOS operational amplifier from the ICL761X–ICL764X family, manufactured by Analog Devices Inc./Maxim Integrated. It features pin-selectable quiescent currents of 10μA, 100μA, or 1000μA per amplifier. The device operates from ±1V to ±8V power supplies or single supplies from 2V to 16V. Key electrical parameters include a typical input bias current of 1pA (max 4nA at +125°C), an input resistance of 10^12 Ω, and a unity-gain bandwidth of 0.044 MHz at 10μA IQ. The output voltage swing reaches within millivolts of the supply rails.

Feature Summary

• Ultra-low input bias current of 1pA typical for high-impedance source applications
• Programmable quiescent current selection via the IQ pin for power-bandwidth optimization
• Rail-to-rail CMOS output capability with millivolt proximity to supply voltages
• Industry-standard pinouts compatible with legacy designs

Applications

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

Procurement Notes

Verify the specific suffix 'DCSA+' against the manufacturer's official ordering information to confirm the package type, temperature range, and lead-free status. Ensure the design accounts for the pin-selectable quiescent current configuration required for the target application performance.

Selection Notes

Select this component when ultra-low input bias current and low power consumption are critical. The programmable IQ feature allows designers to trade off bandwidth and slew rate against power dissipation. Verify that the selected quiescent current setting provides sufficient gain and speed for the specific circuit requirements.

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 '1' in the model number indicates a single amplifier configuration within this product line.

Replacement Considerations

The datasheet identifies the ICL761X series as having pin-for-pin second sources. Specific substitute part numbers are not explicitly listed in the provided documentation.