CS3301A-ISZ

Analog To Digital Converters (ADC) Overview

The CS3301A-ISZ is a low-noise, chopper-stabilized CMOS differential amplifier with programmable gain, designed for precision analog signals between DC and 2 kHz. It features selectable gains of x1 to x64 via pin settings, multiplexed differential inputs (INA/INB), and separate rough/fine outputs optimized for interfacing with delta-sigma modulators like the CS5371A/72A/73A. The device operates on bipolar ±2.5 V analog supplies and a +3.3 V digital supply, consuming 5.5 mA typically in normal mode. Key specifications include an input voltage noise density of 8.5 nV/√Hz (0.1 Hz to 2 kHz) and a typical total harmonic distortion of -121 dB at x1 gain.

Analog To Digital Converters (ADC) Feature Summary

• Programmable Gain: Binary weighted gains from x1 to x64 selected via GAIN0-GAIN2 pins.
• Low Noise Performance: Input voltage noise density of 8.5 nV/√Hz (0.1 Hz to 2 kHz) and 0.18 µVp-p (0.1 Hz to 10 Hz).
• Multiplexed Inputs: Supports INA, INB, or internal 800 Ω termination selection via MUX0/MUX1 pins.
• Differential Outputs: Separate rough and fine charge outputs facilitate direct connection to delta-sigma modulator anti-alias filters.

Analog To Digital Converters (ADC) Applications

• Geophone signal amplification in seismic data acquisition systems.
• Hydrophone pre-amplification for underwater acoustic sensing.
• Front-end conditioning for high-resolution delta-sigma ADCs (e.g., CS5371A/72A/73A).

Analog To Digital Converters (ADC) Procurement Notes

Verify component authenticity through authorized distributors as counterfeit prevention is critical for precision analog ICs. Confirm RoHS compliance status for the ISZ suffix variant. Check current lifecycle status, as older Cirrus Logic components may be subject to discontinuation notices. Ensure proper ESD handling during storage and assembly due to CMOS input sensitivity.

Analog To Digital Converters (ADC) Selection Notes

Select the CS3301A-ISZ when amplifying low-level differential signals from low-impedance sensors requiring high dynamic range and low distortion. Ensure the application supports bipolar ±2.5 V analog power rails and a +3.3 V digital rail. Verify that the required gain settings align with the binary-weighted options (x1-x64) and that the 2 kHz bandwidth meets system frequency requirements.

Analog To Digital Converters (ADC) Part Context

The CS3301A is part of Cirrus Logic's specialized sensor interface family, often paired with CS53xx series delta-sigma modulators and digital filters. It serves as the front-end amplifier stage in multi-channel acquisition systems, providing necessary gain, filtering, and impedance matching before analog-to-digital conversion. The ISZ suffix indicates a lead-free, RoHS-compliant version in a 24-pin SSOP package.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate functional compatibility regarding gain ranges, noise performance, and pinout if considering alternative differential amplifiers. Verify that any replacement supports the required bipolar supply configuration and differential output architecture.