821024J

Overview

The Renesas 821024J is a single-chip, four-channel PCM CODEC featuring on-chip digital filters. It provides analog-to-digital and digital-to-analog conversions with support for both A-law and M-law companding. The device interfaces voice telephone circuits with time-division multiplexed systems using internal digital signal processors derived from the MCLK input. Key electrical parameters include an 8-bit resolution, a supply voltage range of 4.75V to 5.25V, and operation within a temperature range of -40°C to +85°C. It is housed in a 32-pin PLCC package.

Feature Summary

• Integrates four independent PCM channels with dedicated analog-to-digital and digital-to-analog conversion capabilities.
• Includes on-chip digital filters that perform transmit and receive filtering for voice telephone circuits.
• Supports standard A-law and M-law companding algorithms for audio signal processing.

Applications

• Time-division multiplexed (TDM) telecommunication systems
• Voice telephone circuit interfaces
• PCM audio codec applications

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix designation matches the required package type, as variations exist between PLCC and TQFP options. Check current lifecycle status, as this series may be subject to discontinuation notices. Ensure compliance with RoHS3 specifications if environmental regulations apply to the assembly process.

Selection Notes

Select this component when designing systems requiring multi-channel PCM encoding and decoding with integrated filtering. Verify that the system clock architecture can provide the necessary MCLK signal for the internal digital signal processors. Ensure the operating environment stays within the specified -40°C to +85°C temperature range. Confirm power supply stability within the 4.75V to 5.25V window to maintain signal integrity.

Part Context

This part belongs to the 821024 family of PCM CODECs manufactured by Renesas Electronics Corporation. The family includes variants such as the 821024PPG in a TQFP package. These devices are designed for legacy telecommunication infrastructure where high channel density and integrated filtering reduce board space requirements.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official Renesas resources for potential last-time buy information or approved alternative components within the same product family.