CS3301-ISR

Overview

The CS3301-ISR is a low-noise, differential input, differential output amplifier with programmable gain, optimized for amplifying signals from low-impedance sensors such as geophones. It features selectable gains of x1, x2, x4, x8, x16, x32, and x64 via pin settings. The device supports multiplexed inputs including INA, INB, and an internal 800 Ω termination. Key electrical parameters include a signal bandwidth from DC to 2 kHz, maximum signal amplitude of 5 Vpp differential, and low input bias current of 500 pA. Noise performance is specified at 0.20 µVp-p between 0.1 Hz and 10 Hz, and 8.5 nV/√Hz from 0.1 Hz to 2 kHz. Total harmonic distortion is typically -118 dB. Power consumption varies by mode: 5.5 mA (Normal), 3.5 mA (LPWR), and 10 µA (PWDN). It operates on single or dual power supplies.

Feature Summary

• Low-noise differential input and output architecture designed for sensor signal conditioning
• Programmable gain selection via simple pin settings for flexible system integration
• Multiplexed input capability supporting sensor, test DAC, and internal termination connections
• Low power consumption with configurable Normal, Low Power, and Power Down modes

Applications

• Amplifying signals from low-impedance sensors such as geophones
• Seismic data acquisition systems requiring high dynamic range
• Precision measurement instrumentation utilizing differential signal paths

Procurement Notes

Verify the specific suffix 'ISR' against official Cirrus Logic documentation to confirm package type, temperature range, and tape-and-reel specifications. Ensure compatibility with existing board layouts and thermal requirements. Confirm end-of-life status and availability through authorized distributors. Cross-reference pin assignments with the official datasheet to prevent integration errors during procurement and assembly processes.

Selection Notes

Select the CS3301-ISR when designing systems that require low-noise amplification of differential signals from low-impedance sources like geophones. Consider its programmable gain options and multiplexed inputs for simplified system design. Evaluate power consumption requirements across Normal, LPWR, and PWDN modes. Verify that the operating voltage ranges and signal bandwidth meet the application's specific needs for precision and speed.

Part Context

The CS3301 series comprises low-noise, programmable gain differential amplifiers manufactured by Cirrus Logic. These devices are part of a family optimized for interfacing with low-impedance sensors. The series includes variants such as CS3301, CS3301-IS, and CS3301-ISZ, differing primarily in packaging and temperature ratings. The CS3301-ISR is a specific variant within this lineup, maintaining the core functional characteristics of the series while adhering to specific manufacturing and packaging standards defined by the manufacturer.

Replacement Considerations

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