W681310S

Overview

The W681310S is a single-channel PCM CODEC compliant with ITU G.712 and G.711 standards, operating from a single +3V supply (2.7V to 5.25V). It features pin-selectable μ-Law or A-Law companding and supports eight master clock rates between 256 kHz and 4.800 MHz via an internal pre-scaler. The device includes fully differential analog circuits, an on-chip precision voltage reference of 0.886 V, and push-pull power amplifiers capable of driving 300 Ω loads differentially up to 3.544 V peak-to-peak. Typical power dissipation is 10 mW, reducing to 0.5 μW in power-down mode. It operates within the industrial temperature range of –40°C to +85°C.

Feature Summary

• Fully differential analog circuit design for noise reduction and improved power supply rejection ratio
• Integrated push-pull power amplifier with external gain adjustment capability
• Supports long-frame, short-frame, GCI, and IDL communication protocols
• On-chip precision voltage reference for accurate signal processing

Applications

• VoIP and Voice over Networks
• Digital telephone and communication systems
• Wireless voice devices
• PABX/SOHO systems
• ISDN equipment

Procurement Notes

Verify the specific package suffix against the datasheet ordering information to ensure compatibility with your PCB footprint. Confirm that the component revision matches the required specifications for your application. Check for Pb-Free status if environmental compliance is mandatory. Ensure the supplier provides valid traceability documentation for quality assurance purposes.

Selection Notes

Select this component for applications requiring a low-power, single-channel voiceband codec. Ensure the system design accommodates the 2.7V to 5.25V supply range and the 300 Ω load requirement for the output stage. Verify that the available master clock frequencies align with the supported rates of 256 kHz to 4.800 MHz. Consider the industrial temperature range if the device will operate in harsh environments.

Part Context

The W681310 series belongs to Nuvoton's family of single-channel PCM CODECs designed for voiceband applications. It shares functional similarities with other models like the W681512 but differs in supply voltage requirements and specific performance parameters. This series is optimized for cost-effective integration into digital telephony and communication systems.

Replacement Considerations

Direct substitutes may include other single-channel PCM CODECs from Nuvoton such as the W681512, provided the supply voltage and interface requirements are compatible. Verify pinout compatibility and electrical characteristics before replacement.

FAQ

How is the companding format selected?

The companding format is selected by connecting the μ/A-Law pin to either VDD for μ-Law or VSS for A-Law.

What is the maximum differential output voltage?

The PAO+ and PAO- pins can drive a 300 Ω load differentially up to 3.544 V peak-to-peak.

Can the device support ISDN applications?

Yes, the W681310 supports General Circuit Interface (GCI) and Interchip Digital Link (IDL) communications suitable for ISDN applications.