CS8420-DSZR Audio Sample Rate Converter Equivalent & Substitute Parts

Part Overview

The CS8420-DSZR is a 2-channel audio sample rate converter manufactured by Cirrus Logic Inc., housed in a 28-SOIC surface mount package. This component is designed for digital audio interfacing applications, supporting sample rate conversion across the 8kHz to 108kHz range. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

CS8420-DSZR

Cirrus Logic Inc.In Stock: 1068CS8420-DSZR Datasheet

Current PartRFQ

SRC4382IPFBR

Texas InstrumentsIn Stock: 1361SRC4382IPFBR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS8420-DSZR is determined by the following critical parameters:

• Functional Equivalence: Both parts must perform 2-channel audio sample rate conversion
• Interface Compatibility: Both parts must support I2C and SPI communication protocols
• Operating Temperature Range: Substitute must maintain -40°C ~ 85°C operational capability
• Channel Configuration: 2-channel architecture must be preserved
• Application Domain: Digital audio interfacing functionality

The SRC4382IPFBR from Texas Instruments meets these core functional requirements. While package geometry and voltage supply specifications differ, the substitute maintains equivalent sample rate conversion capability, dual-channel architecture, and required interface protocols necessary for digital audio applications.

Parameter Comparison

Engineering Selection Recommendations

The SRC4382IPFBR serves as a functional substitute for the obsolete CS8420-DSZR based on the following engineering criteria:

Functional Compatibility: Both components provide 2-channel audio sample rate conversion with I2C and SPI interface support, meeting core digital audio interfacing requirements.

Product Status: The SRC4382IPFBR maintains active product status with ongoing manufacturer support, whereas the CS8420-DSZR is obsolete. This distinction is critical for long-term supply chain reliability and technical documentation availability.

Compliance and Certifications: Both parts carry identical REACH Unaffected and EAR99 ECCN classifications, ensuring equivalent regulatory compliance for export and environmental standards.

Operating Temperature Range: Both components support the identical -40°C ~ 85°C operating temperature specification, maintaining thermal performance parity across industrial and commercial applications.

Design Considerations: The substitute features an expanded sample rate range (4kHz ~ 216kHz versus 8kHz ~ 108kHz) and improved moisture sensitivity rating (MSL 2 versus MSL 3), providing enhanced performance margins. However, the package transition from 28-SOIC to 48-TQFP and voltage supply change from 4.75V ~ 5.25V to 3V ~ 3.6V require PCB layout and power supply modifications.

Frequently Asked Questions (FAQ)

Q: Can the SRC4382IPFBR directly replace the CS8420-DSZR without PCB modifications?

A: No. The package geometry differs (28-SOIC versus 48-TQFP), and the voltage supply range is different (4.75V ~ 5.25V versus 3V ~ 3.6V). PCB layout redesign and power supply circuit modifications are required.

Q: Are the interface protocols identical between these two parts?

A: Yes. Both components support I2C and SPI communication protocols, ensuring software and firmware compatibility at the interface level.

Q: What is the significance of the expanded sample rate range in the SRC4382IPFBR?

A: The SRC4382IPFBR supports 4kHz ~ 216kHz, compared to the CS8420-DSZR's 8kHz ~ 108kHz. This expanded range provides greater flexibility for applications requiring lower or higher sample rates, though it does not affect compatibility with systems designed for the original part's specification range.

Q: Why is product status important in component selection?

A: The CS8420-DSZR is obsolete, meaning Cirrus Logic no longer manufactures or supports this component. The SRC4382IPFBR's active status ensures continued availability, technical documentation, and manufacturer support for design questions or issues.

Q: How do the moisture sensitivity levels affect handling and storage?

A: The CS8420-DSZR (MSL 3, 168 hours) requires more stringent moisture control during storage and handling compared to the SRC4382IPFBR (MSL 2, 1 year). The substitute offers improved moisture tolerance, reducing handling complexity in manufacturing environments.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both components operate across -40°C ~ 85°C, maintaining identical thermal performance specifications for industrial and commercial applications.