CS8421-EZZR

Audio Special Purpose Overview

The CS8421-EZZR is a 32-bit, high-performance, monolithic CMOS stereo asynchronous sample-rate converter (SRC) from Cirrus Logic. It supports digital audio inputs and outputs with resolutions of 32, 24, 20, or 16 bits. The device operates on a single +2.5 V digital supply (VD) and features a logic interface compatible with +2.5 V or +3.3 V systems. It is housed in a 20-TSSOP package and is designed for automotive applications with an extended operating temperature range.

Audio Special Purpose Feature Summary

• Stereo asynchronous sample-rate conversion with input/output ratios ranging from 7.5:1 to 1:8
• Supports sample rates up to 211 kHz
• Single +2.5 V digital supply operation
• Linear phase FIR filter with automatic soft mute/unmute and dither application
• No external master clock required; includes clock recovery circuitry
• Configurable 3-wire serial digital audio ports supporting Master and Slave modes

Audio Special Purpose Applications

• Digital recording systems including DVD-R/RW, CD-R/RW, PVR, DAT, MD, and VTR
• Digital mixing consoles and high-quality D/A converters
• Effects processors and computer audio systems
• Automotive audio systems

Audio Special Purpose Procurement Notes

The CS8421 family has reached End-of-Life (EOL). The specific -EZZR variant (Automotive grade, Tape & Reel) may be difficult to source as new production. Verify current stock availability with distributors. Last Time Buy (LTB) dates should be confirmed with the manufacturer or authorized distributors.

Audio Special Purpose Selection Notes

Select the CS8421-EZZR for applications requiring automotive-grade reliability (-40°C to +105°C TA) and the 20-TSSOP surface-mount package. This variant is distinct from commercial grades (e.g., CS8421-CZZR) which typically operate over a narrower temperature range (-10°C to +70°C). Ensure the design accommodates the 20-TSSOP footprint (4.40mm width).

Audio Special Purpose Part Context

The CS8421 is part of Cirrus Logic's high-performance audio SRC family, providing a space-saving solution by integrating digital filtering and clock recovery without external components. The 'E' suffix denotes the Automotive temperature grade, while 'ZZR' indicates the 20-TSSOP package and Tape & Reel packaging.

Audio Special Purpose Replacement Considerations

As the CS8421 is obsolete, direct replacements are limited. Consider pin-compatible alternatives if available, but verify that any substitute meets the -40°C to +105°C operating temperature requirement and the specific performance metrics (dynamic range, THD+N). Note that other variants like the CS8422 offer similar functionality but may require software control and differ in package (e.g., QFN).