821004JG8

Overview

The Renesas Electronics 821004JG8 is a single-chip, four-channel PCM CODEC designed for voice telephone circuit applications. It provides analog-to-digital and digital-to-analog conversions with selectable A-law or μ-law companding. The device features on-chip digital filters operating from an internal clock derived from the master clock (MCLK). It supports master clock frequencies of 2.048MHz, 4.096MHz, or 8.192MHz, enabling a single PCM port data rate up to 8.192MHz across 128 time slots. Internal timing adjusts automatically based on MCLK and frame sync signals. The component utilizes low-power +5.0V CMOS technology with a single power supply requirement.

Feature Summary

• Integrates four-channel PCM codec functionality with on-chip digital signal processing for transmit and receive filtering.
• Supports selectable A-law and μ-law companding standards for voice data compression.
• Features hardware-adjustable transhybrid balance impedance and transmit gains via external components.
• Operates with separate PCM and master clocks, allowing flexible system integration.

Applications

• Voice telephone circuits interfacing with time-division multiplexed systems
• PCM communication equipment requiring analog-to-digital conversion
• Digital-to-analog conversion in telephony infrastructure

Procurement Notes

Verify the specific suffix JG8 against official documentation to confirm package type and lead-free status. Confirm current lifecycle status as obsolete or last-time-buy information may apply. Ensure compatibility with -40°C to 85°C operating temperature range requirements. Validate PLCC-32 package dimensions for PCB layout accuracy before finalizing procurement decisions.

Selection Notes

Select this component when a four-channel PCM codec with integrated digital filters is required. Ensure the design supports +5.0V single supply operation. Verify that hardware-adjustable gain and impedance matching via external components align with the system architecture. Confirm master clock frequency selection options match the available system clock sources.

Part Context

The 821004JG8 belongs to the 821004 series of four-channel PCM CODECs. This series focuses on providing complete analog-to-digital and digital-to-analog conversion solutions for telephony applications. The device integrates necessary digital signal processing functions to interface directly with time-division multiplexed systems, reducing the need for external filter components.

Replacement Considerations

The 821004JG8 is listed as obsolete. The 821004JG variant is identified as a previous version within the same series. Designers should evaluate alternative PCM codecs from Renesas or other manufacturers that offer similar four-channel capabilities and +5.0V operation if replacement is necessary.