W681511S

Overview

The W681511S is a single-channel voiceband PCM codec manufactured by Nuvoton Technology Corporation. It operates from a single +5V power supply and supports pin-selectable μ-Law or A-Law companding compliant with ITU G.711. The device integrates fully differential analog circuits, on-chip precision voltage references, and push-pull power amplifiers capable of driving 300Ω loads differentially. It accepts master clock rates ranging from 256 kHz to 4.096 MHz via an internal prescaler. The component meets ITU G.712 specifications for band-limiting and smoothing filters, ensuring compliance with standard PCM system requirements.

Feature Summary

• Supports pin-selectable μ-Law and A-Law companding standards
• Integrates fully differential analog design for noise reduction
• Includes on-chip precision reference and push-pull power amplifier
• Compatible with PCM long/short frame and ISDN communication protocols

Applications

• VoIP and Voice over Networks equipment
• Digital telephone and communication systems
• Wireless voice devices and Bluetooth headsets
• DECT and digital cordless phones
• Fiber-to-curb and broadband access equipment

Procurement Notes

Verify the specific suffix 'S' against official datasheets to confirm package type, as variations exist within the family. Confirm RoHS compliance status and moisture sensitivity level prior to ordering. Check for active manufacturing status or obsolescence notices from Nuvoton. Ensure compatibility with required industrial temperature ranges if deployed in harsh environments.

Selection Notes

Select this component for applications requiring a single-channel voiceband codec with integrated output drivers. Verify that the system interface supports PCM audio protocols. Ensure the power supply architecture aligns with the single +5V requirement. Consider the thermal performance given the typical 30 mW dissipation during operation.

Part Context

The W681511S belongs to the W68151x series of voiceband codecs from Nuvoton. This family shares core functionalities such as ITU G.712 compliance and differential output capabilities. Variations within the series typically involve differences in packaging options like SOG, SSOP, or TSSOP, and minor electrical parameter adjustments while maintaining the same fundamental voice processing architecture.

Replacement Considerations

Direct replacements may include other models within the W68151x series, such as the W681512, provided pinout and functional compatibility are verified. Cross-referencing with similar single-channel PCM codecs from other manufacturers requires careful evaluation of voltage levels and interface timing.