W681512RG

Overview

The W681512RG is a single-channel voiceband CODEC manufactured by Nuvoton Technology Corporation, designed for PCM interface applications. It operates on a single +5V power supply with a voltage range of 4.5 V to 5.5 V. The device features one ADC and one DAC with 8-bit resolution. It supports a sampling rate of 8 kHz and accepts master clock frequencies between 256 kHz and 4.096 MHz. The component is housed in a 20-pin SSOP package and functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Supports selectable μ-law or A-law companding via pin configuration, complying with ITU G.711 standards.
• Integrates a push-pull power amplifier capable of differentially driving 300Ω loads with peak-to-peak output up to 6.3V.
• Includes an on-chip 1.575 V precision voltage reference suitable for 0 dBm TLP conditions into 600Ω.
• Features full differential analog circuit design to reduce noise and improve power supply rejection ratio.

Applications

• Voice over IP (VoIP) systems
• Network voice communication devices
• PCM-based telecommunication equipment

Procurement Notes

The W681512RG is listed as an End-of-Life (EOL) product by the manufacturer. Distribution availability is restricted, with some major distributors indicating no sales in certain regions. Verification of current stock status and alternative sourcing channels is required before procurement planning. Designers should assess long-term supply chain risks associated with discontinued components.

Selection Notes

Select this component for single-channel voiceband processing requiring differential outputs and integrated amplification. Ensure the system provides a stable 5V supply within the 4.5V to 5.5V operating window. Verify compatibility with PCM frame formats and master clock frequencies ranging from 256 kHz to 4.096 MHz. Confirm that the SSOP-20 package fits the PCB layout constraints.

Part Context

This part belongs to the Nuvoton W681512 series of audio CODECs. The 'RG' suffix typically denotes a specific packaging variant, such as the SSOP-20 form factor, distinct from other package options like SOG or TSSOP available in the broader family. It serves as a specialized interface solution for voice data conversion in telecommunications infrastructure.

Replacement Considerations

As the W681512RG is discontinued, engineers must identify functional equivalents from current production lines. Potential substitutes should match the single-channel PCM codec architecture, 5V operation, and SSOP-20 package. Cross-referencing datasheets for electrical parameters and pin compatibility is essential to ensure seamless integration into existing designs.