CS4373A-ISZR

ADCs/DACs - Special Purpose Overview

The CS4373A-ISZR is a high-performance, differential output digital-to-analog converter (DAC) designed for self-test and precision calibration in multi-channel measurement systems. It accepts a delta-sigma digital bit stream from the CS5376A digital filter test bit stream generator. The device features two sets of differential analog outputs: OUT± for electronics testing and BUF± for sensor tests. It supports selectable attenuation ratios to match amplifier gains and operates in multiple AC and DC modes. Key electrical specifications include a typical THD of -116 dB for the OUT± output and a maximum DC absolute accuracy of 1%. The component operates within an ambient temperature range of -40°C to +85°C.

ADCs/DACs - Special Purpose Feature Summary

• Dual Differential Outputs: Provides OUT± for precision electronics testing and BUF± for buffered sensor testing.
• Programmable Attenuation: Supports attenuation settings of 1, 1/2, 1/4, 1/8, 1/16, 1/32, and 1/64 via pin selection.
• Multiple Operational Modes: Includes AC test modes for THD/CMRR measurement and DC test modes for gain calibration.
• Low Power Consumption: Consumes 40 mW in AC modes, 20 mW in DC modes, and 10 µW in power-down mode.

ADCs/DACs - Special Purpose Applications

• Self-test and calibration for geophysical measurement systems.
• Precision calibration for sonar channel electronics.
• Gain calibration and pulse testing for high-resolution low-frequency measurement systems.

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'ISZR' against current manufacturer documentation to confirm package type and environmental rating. Confirm availability status as distribution channels may list this component as obsolete or limited supply. Ensure the ordering suffix does not imply functional changes unless explicitly stated in the official datasheet.

ADCs/DACs - Special Purpose Selection Notes

Select the CS4373A when designing systems using CS3301A/CS3302A amplifiers and CS5371A/CS5372A modulators. Ensure the application requires a dedicated test DAC driven by the CS5376A digital filter. Verify that the bipolar power supply configuration (+/- 2.5 V analog, +3.3 V digital) fits the system design constraints.

ADCs/DACs - Special Purpose Part Context

The CS4373A is part of a family of components intended for high-dynamic-range measurement systems. It complements the CS5371A/CS5372A delta-sigma modulators and CS3301A/CS3302A differential amplifiers. The device enables small, low-power, self-testing systems by providing precision analog test signals synchronized with the digital filter's test bit stream.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult Cirrus Logic for current equivalent recommendations if this component is discontinued.

ADCs/DACs - Special Purpose FAQ

What is the maximum frequency for stable AC test signals?

Full-scale AC test signals must not contain frequencies above 100 Hz to ensure stability of the low-power delta-sigma architecture.

How is the device powered down?

The device automatically enters power-down mode after approximately 40 µs without an incoming MCLK edge, deactivating AC/DC test circuitry and setting outputs to high impedance.

What is the difference between OUT± and BUF± outputs?

OUT± are precision outputs intended for high-impedance loads like amplifier inputs, while BUF± are buffered outputs capable of driving lower-impedance loads down to 1 kΩ.