W681310SG

Overview

The W681310SG is a single-channel PCM voiceband CODEC manufactured by Nuvoton Technology Corporation. It operates from a single +3V power supply (2.7V to 5.25V) and supports pin-selectable μ-Law or A-Law companding compliant with ITU G.711. The device integrates an analog-to-digital converter, digital-to-analog converter, and push-pull power amplifiers capable of driving 300Ω loads differentially up to 3.544V peak-to-peak. It accepts eight master clock rates between 256 kHz and 4.800 MHz via an on-chip pre-scaler. The component is housed in a 20-pin SOG package and functions within an industrial temperature range of –40°C to +85°C.

Feature Summary

• Supports long-frame, short-frame, GCI, and IDL synchronous communication protocols for PCM and ISDN applications.
• Integrates fully differential analog circuitry with an on-chip precision voltage reference to reduce noise and improve power supply rejection.
• Includes built-in band limiting and smoothing filters that comply with the ITU-T G.712 specification.

Applications

• VoIP and Voice over Networks systems
• Digital telephone and communication equipment
• PABX and SOHO systems
• ISDN terminals and local loop cards

Procurement Notes

Verify the specific suffix 'SG' against the manufacturer's ordering information to confirm the exact package type and tape-and-reel specifications. Confirm current production status and availability through authorized distributors, as lead times may vary based on manufacturing schedules.

Selection Notes

Select this component for designs requiring a single-supply voiceband codec with integrated power amplification. Ensure the system provides a stable 2.7V to 5.25V supply and supports the required master clock frequencies. Verify that the 20-pin SOG package dimensions fit the PCB layout constraints.

Part Context

The W681310 series consists of general-purpose single-channel PCM CODECs designed for voiceband applications. Variants such as the W681310RG and W681310WG offer alternative packaging options like SSOP and TSSOP while maintaining identical electrical characteristics and functionality.

Replacement Considerations

W681310RG

FAQ

How is the companding format selected?

The companding format is selected via the µ/A-Law pin. Connecting this pin to VDD selects µ-Law, while connecting it to VSS selects A-Law.

What interface modes are supported?

The device supports Long Frame Sync, Short Frame Sync, General Circuit Interface (GCI), and Interchip Digital Link (IDL) modes, selectable via the BCLKR and FSR pins.

Can the transmit power amplifier be powered down?

Yes, the transmit power amplifier can be powered down by connecting the PAI pin to VDD when it is not in use.