ICL7650CPD

Overview

The ICL7650CPD is a chopper-stabilized operational amplifier in a 14-pin plastic DIP package, designed for low-level signal processing. It features a maximum input offset voltage of 10µV and an input bias current of 20pA over the commercial temperature range (0°C to +70°C). The device offers a unity-gain bandwidth of 2MHz, a slew rate of 2.5V/µs, and a minimum common-mode rejection ratio of 120dB. It includes an internal oscillator with a chopping frequency of 200Hz and an output clamp circuit to minimize overload recovery time.

Feature Summary

• Chopper-stabilized architecture provides continuous error correction to maintain minimal input offset voltage across temperature variations.
• Integrated output clamp circuit reduces overload recovery time inherent in chopper amplifiers.
• Monolithic CMOS design ensures low power consumption and high input impedance.
• Internal clock generates a 200Hz chopping frequency, eliminating the need for external timing components.

Applications

• Precision Amplifier
• Instrumentation Amplifier
• Thermocouples
• Strain Gauges

Procurement Notes

Verify that the specific orderable part number matches the required package and temperature grade. Confirm that the component meets all electrical specifications for the intended operating environment. Ensure proper handling procedures are followed due to the sensitivity of CMOS inputs to electrostatic discharge.

Selection Notes

Select this component when ultra-low DC offset and drift are critical requirements. The 14-pin package allows for optional external clocking or use of the internal oscillator. Consider the output clamp feature if fast recovery from saturation is necessary. Evaluate load driving capabilities as open-loop gain varies with load resistance.

Part Context

This device belongs to the ICL7650 family of chopper-stabilized amplifiers manufactured by Maxim Integrated. It serves as an improved second source to Intersil's ICL7650B. The CPD suffix denotes the 14-pin Plastic DIP package with a commercial temperature range of 0°C to +70°C.

Replacement Considerations

The ICL7653 is a compatible alternative within the same family that lacks the output clamp feature but offers slightly lower noise and improved AC common-mode rejection. Verify pin compatibility when replacing legacy devices like the LM741, noting that nulling capacitors connect to pins 1 and 8.

FAQ

How does the ICL7650 achieve low input offset voltage?

It uses a nulling scheme where a nulling amplifier alternately nulls itself and the main amplifier, providing continuous error correction to hold input offset voltage to a minimum.

What is the function of the CLAMP pin on the ICL7650?

The CLAMP pin connects to an output clamp circuit that reduces overload recovery time by preventing uncontrolled input differential and charge build-up on correction-storage capacitors during saturation.