W681513SG

Overview

The W681513 is a single-channel PCM voiceband CODEC designed for USB applications, operating from a single +5V supply. It supports pin-selectable μ-Law and A-Law companding compliant with ITU G.711 and features filtering compliant with ITU G.712. The device accepts a 2.000 MHz master clock and includes an on-chip precision voltage reference and power amplifier capable of driving 300 Ω loads differentially up to 6.3V peak-to-peak. It operates within an industrial temperature range of –40°C to +85°C and is available in a 20-pin SOP package.

Feature Summary

• Supports 2.000 MHz master clock rate specifically for USB accessory market applications
• Fully-differential analog circuit design with on-chip precision voltage reference
• Includes push-pull power amplifiers with external gain adjustment for differential output
• Pin-selectable μ-Law and A-Law companding modes

Applications

• Soft phones running on a PC (VoInternet)
• USB Phones
• USB Microphones
• USB Headset for PC and Game Consoles

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and environmental compliance status. Confirm availability as this component may be subject to discontinuation or limited production runs. Ensure the selected variant matches the required interface mode and companding format for the target system design.

Selection Notes

Select this component when a dedicated voiceband codec with integrated power amplification is required for USB-based audio interfaces. The fixed 2.000 MHz master clock requirement dictates the system timing architecture. Verify that the host controller can support the required PCM interface modes, including long/short frame sync or ISDN GCI/IDL protocols, before finalizing the design.

Part Context

The W681513 belongs to Nuvoton's family of single-channel voiceband CODECs tailored for digital telephony and USB audio peripherals. It integrates analog front-end processing with digital compression algorithms, eliminating the need for external companders or complex filter networks. This integration reduces board space and simplifies the design of USB audio gateways and softphone hardware.

Replacement Considerations

Check for updated revisions or alternative packages within the same product line if the current version is discontinued. Verify compatibility with existing firmware drivers, as interface timing parameters for PCM and ISDN modes must match the host controller specifications exactly.