CS3001-ISZ

Overview

The CS3001-ISZ is a single-channel precision low-voltage operational amplifier manufactured by Cirrus Logic. It operates within a supply voltage range of 2.7 V to 6.7 V (±1.35 V to ±3.35 V). Key electrical specifications include a maximum input offset voltage of 10 μV, an average input offset drift of 0.05 μV/°C, and a typical open-loop voltage gain of 300 dB. The device features a slew rate of 5 V/μs, a supply current of 2.8 mA, and a power-down function on pin 1 for the single amplifier variant.

Feature Summary

• Designed for precision amplification of low-level signals with excellent offset stability and super-high open-loop gain over time and temperature.
• Features rail-to-rail output swing and a common mode input range that includes the negative supply rail.
• Includes a dedicated power-down function on pin 1 for the single amplifier variant to reduce current consumption.

Applications

• Thermocouple and thermopile amplifiers
• Load cell and bridge transducer amplifiers
• Precision instrumentation circuits
• Battery-powered systems

Procurement Notes

Verify the specific package type and lead-free status when ordering. Confirm the operating temperature range requirements against the datasheet specifications. Ensure the application circuit accounts for the required compensation capacitor if closed-loop gains exceed 50 V/V or source resistance exceeds recommended limits. Check for moisture sensitivity level handling instructions during assembly.

Selection Notes

Select this component for applications requiring high DC precision and low noise at frequencies up to 2 kHz. Consider the CS3002-ISZ if dual amplifier channels are needed. Evaluate the need for external compensation capacitors based on the intended closed-loop gain and source resistance values to ensure stability. Verify that the supply voltage range aligns with the system's power constraints.

Part Context

The CS3001-ISZ belongs to the CS3001/CS3002 family of precision low-voltage amplifiers from Cirrus Logic. These devices utilize a patented architecture with multiple amplifier stages to achieve ultra-high open-loop gain at frequencies below 10 kHz. The family is optimized for measuring small signals where high gain and low drift are critical performance factors.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

What is the recommended compensation strategy for closed-loop gains greater than 50 V/V?

For closed-loop gains exceeding 50 V/V, a compensation capacitor (C2) must be added in parallel with the feedback resistor (R2). The value should be calculated to ensure the zero falls on the steep slope of the loop gain plot and the pole is higher than the internal crossover frequency.

How does the power-down function operate on the CS3001?

The CS3001 provides a power-down function on pin 1. Asserting this pin low activates a low-power state. An internal pull-up resistor of approximately 800 kΩ connects pin 1 to V+, which is the primary source of current drain in the active low state.