W681513S

Overview

The W681513 is a single-channel PCM CODEC designed for USB applications, operating from a single +5V supply. It supports a fixed 2.000 MHz master clock and includes pin-selectable μ-Law or A-Law companding compliant with ITU G.711. The device features fully differential analog circuits, an on-chip precision reference of 1.575 V, and push-pull power amplifiers 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
• Includes fully-differential analog circuit design and output signals to reduce noise
• Features pin-selectable μ-Law and A-Law companding compliant with ITU G.711
• Integrates push-pull power amplifiers with external gain adjustment capability

Applications

• USB Phones and Soft phones running on a PC (VoInternet)
• USB Microphones
• USB Headsets for PC and Game Consoles
• USB to PSTN Gateway devices

Procurement Notes

Verify the specific package variant and RoHS compliance status directly with Nuvoton Technology Corporation or authorized distributors before procurement. Confirm that the 2.000 MHz master clock requirement aligns with the host system's timing capabilities. Ensure proper decoupling capacitors are included in the design for the VDD and VAG pins as specified in the datasheet.

Selection Notes

Select this component when a dedicated voiceband codec for USB interfaces is required. It is suitable for designs needing integrated power amplification for direct speaker or line-level driving without additional external op-amps. Verify compatibility with the target digital interface protocol, such as long-frame or short-frame synchronous PCM, or ISDN GCI/IDL modes if applicable.

Part Context

The W681513 belongs to the W6815xx series of single-channel voiceband CODECs manufactured by Nuvoton Technology Corporation. It shares functional similarities with other models like the W681512 but is distinguished by its support for the 2.000 MHz master clock rate, making it optimized for USB peripheral applications rather than standard telephony systems.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Nuvoton Technology Corporation for current alternative recommendations or obsolescence notices regarding this specific model.