W681310R

Overview

The W681310 is a single-channel PCM CODEC compliant with ITU G.712, operating from a single +3V supply (2.7V to 5.25V). It features pin-selectable μ-Law or A-Law companding per ITU G.711 and includes an on-chip precision voltage reference of 0.886 V for -5 dBm TLP at 600 Ω. The device accepts eight master clock rates between 256 kHz and 4.800 MHz via an internal pre-scaler. Typical power dissipation is 10 mW, reducing to 0.5 μW in power-down mode. It supports long/short frame sync, GCI, and IDL protocols, and drives 300 Ω loads differentially up to 3.544V peak-to-peak.

Feature Summary

• Fully-differential analog circuit design reduces noise and improves power supply rejection ratio.
• Integrated push-pull power amplifiers allow external gain adjustment with 300 Ω load capability.
• Supports multiple data transfer protocols including long-frame, short-frame, GCI, and IDL communications.

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 manufacturer's ordering information to ensure compatibility with the required footprint, such as SOG, SSOP, or TSSOP. Confirm that the component meets Pb-Free requirements if environmental compliance is necessary for the assembly process. Cross-reference the revision level B18 datasheet specifications with the delivered part lot to ensure functional consistency.

Selection Notes

Select this component for applications requiring a single-channel voiceband codec with low power consumption. Ensure the system provides a stable 2.7V to 5.25V supply and supports the required master clock frequencies between 256 kHz and 4.800 MHz. Verify that the interface protocol matches the host processor's capabilities, whether using standard PCM frame sync or ISDN-specific GCI/IDL modes.

Part Context

The W681310 belongs to Nuvoton's family of single-channel voiceband CODECs designed for industrial temperature ranges (-40°C to +85°C). It serves as a direct alternative to other models in the series, offering similar core functionalities but optimized for single-rail +3V operation. The device integrates essential filtering and amplification stages required for compliant PCM signal processing.

Replacement Considerations

Check for W681512 variants when higher voltage supplies are available, noting the difference in operating voltage ranges. Verify pinout compatibility if substituting within the same package type, as interface configurations may vary slightly between revisions or specific sub-models.