CS8420-DSZ Audio Sample Rate Converter Equivalent & Substitute Parts

Part Overview

The CS8420-DSZ 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 with I2C and SPI interface options. The product is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

CS8420-DSZ

Cirrus Logic Inc.In Stock: 1293CS8420-DSZ Datasheet

Current PartRFQ

SRC4382IPFB

Texas InstrumentsIn Stock: 1720SRC4382IPFB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS8420-DSZ 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: Minimum -40°C to 85°C overlap required
• Surface mount capability: Both parts must be surface mountable
• Supply voltage consideration: Voltage ranges differ between parts; system design must accommodate the substitute's supply requirements

The SRC4382IPFB from Texas Instruments meets these substitution criteria. While it operates at a different voltage range (3V ~ 3.6V versus 4.75V ~ 5.25V) and offers an extended sample rate specification (4kHz ~ 216kHz), it maintains functional equivalence in channel count, interface protocols, and operating temperature range. The package format differs (48-TQFP versus 28-SOIC), requiring PCB layout modification.

Parameter Comparison

Engineering Selection Recommendations

The SRC4382IPFB is designated as the manufacturer-recommended substitute for the obsolete CS8420-DSZ. Selection of this alternative is supported by the following factors:

• Active product status: The SRC4382IPFB maintains active production status, ensuring long-term availability and supply chain stability
• Regulatory compliance: Both parts share identical REACH and ECCN classifications, maintaining export and environmental compliance requirements
• Functional capability: The SRC4382IPFB exceeds the original specification range (4kHz ~ 216kHz versus 8kHz ~ 108kHz), providing broader application flexibility
• Temperature range alignment: Operating temperature specifications are identical across both parts

Design implementation requires attention to voltage supply differences. The CS8420-DSZ operates at 4.75V ~ 5.25V, while the SRC4382IPFB requires 3V ~ 3.6V. Power supply circuitry must be modified accordingly. Package transition from 28-SOIC to 48-TQFP necessitates PCB layout redesign and footprint modification.

Frequently Asked Questions (FAQ)

Q: Can the SRC4382IPFB directly replace the CS8420-DSZ without PCB modification?

A: No. The SRC4382IPFB uses a 48-TQFP package compared to the 28-SOIC package of the CS8420-DSZ. PCB footprint redesign is required. Additionally, the supply voltage requirement differs (3V ~ 3.6V versus 4.75V ~ 5.25V), necessitating power supply circuit modification.

Q: Are the I2C and SPI interfaces compatible between these parts?

A: Both parts support I2C and SPI communication protocols. Interface compatibility is maintained; however, register maps and command structures may differ between manufacturers. Firmware or control logic updates may be necessary.

Q: What is the significance of the different sample rate ranges?

A: The CS8420-DSZ supports 8kHz ~ 108kHz, while the SRC4382IPFB supports 4kHz ~ 216kHz. The SRC4382IPFB's extended range encompasses the original specification, providing backward compatibility for existing applications while enabling support for higher sample rates if required.

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

A: The CS8420-DSZ has MSL 3 (168 hours), while the SRC4382IPFB has MSL 2 (1 year). MSL 2 indicates lower moisture sensitivity and longer shelf life before baking is required. The SRC4382IPFB offers improved handling flexibility during manufacturing and storage.

Q: Is the SRC4382IPFB the only available substitute?

A: Based on the provided data, the SRC4382IPFB is the designated manufacturer-recommended substitute. Evaluation of additional alternatives requires comparison against the same critical parameters: 2-channel configuration, I2C/SPI interface support, compatible operating temperature range, and surface mount capability.