ICL7611BCSA

Overview

The ICL7611BCSA is a single-channel monolithic CMOS operational amplifier manufactured by Analog Devices Inc./Maxim Integrated. It features pin-selectable quiescent currents of 10μA, 100μA, or 1000μA per amplifier and operates from ±1V to ±8V dual supplies or 2V to 16V single supplies. The device offers an ultra-low input bias current of 1pA typical (4nA max at +125°C), a unity-gain bandwidth of 0.044MHz at 10μA IQ, and a slew rate of 0.016V/µs at 10μA IQ. It utilizes an 8-pin Slim SO package with a commercial temperature range of 0°C to +70°C.

Feature Summary

• Ultra-low input bias current of 1pA typical for high-impedance source applications
• Pin-selectable quiescent current settings allowing optimization between power consumption and speed
• CMOS outputs swing to within millivolts of supply rails for maximum dynamic range
• Internally compensated 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 specific ordering suffix 'BCSA' corresponds to the 8-pin Slim SO package and the 0°C to +70°C commercial temperature grade. Confirm that the manufacturer designation matches Analog Devices Inc. or Maxim Integrated as specified in the official datasheet documentation before finalizing procurement orders.

Selection Notes

Select this component when low input bias current and rail-to-rail output capability are required. The ICL7611 allows designers to trade off bandwidth and slew rate against power consumption via the programmable IQ pin. Ensure the application does not require external compensation, as this model is internally compensated for unity gain stability.

Part Context

This part belongs to the ICL761X–ICL764X family of monolithic CMOS op amps. The '1' in the model number designates it as a single amplifier configuration, distinguishing it from dual, triple, or quad variants within the same product line which share similar electrical characteristics but differ in channel count and pinout.

Replacement Considerations

The datasheet identifies the device as having a pin-for-pin second source. Verify compatibility with other manufacturers offering equivalent CMOS operational amplifiers featuring programmable quiescent current and similar offset voltage specifications.

FAQ

How is the quiescent current programmed on the ICL7611?

The quiescent current is selected by connecting the IQ pin to V+ for 10μA, leaving it floating between V- + 0.8V and V+ - 0.8V for 100μA, or connecting it to V- for 1000μA.

Is the ICL7611 internally compensated?

Yes, the ICL7611 is internally compensated for unity-gain operation, unlike the ICL7614 which requires external compensation.