W681512R

Overview

The W681512R is a single-channel voiceband CODEC manufactured by Nuvoton Technology Corporation, designed for analog-to-digital and digital-to-analog conversion in compliance with ITU-T G.712 specifications. It features pin-selectable µ-Law and A-Law companding per ITU-T G.711 standards. The device operates on a single supply voltage ranging from 4.5V to 5.5V and supports an 8kHz sampling rate with 8-bit resolution. It includes a fully differential analog output stage with an integrated power amplifier capable of driving a 300Ω load up to 6.3V peak-to-peak. The PCM interface accommodates short frame sync, long frame sync, IDL, and GCI timing environments.

Feature Summary

• Integrated push-pull power amplifier with external gain adjustment for high current output
• On-chip precision reference voltage for standardized telephony line testing
• Supports multiple master clock rates via internal pre-scaler
• Fully differential analog circuit design to minimize noise

Applications

• VoIP and Voice over Networks gateways
• PBX systems and PABX/SOHO equipment
• ISDN equipment and modems
• Digital telephone systems and enterprise phones

Procurement Notes

Verify the specific manufacturer origin as the component appears under both Winbond and Nuvoton branding in public records. Confirm package availability, as the datasheet specifies 20-pin SOP/SSOP while other distributors list TSSOP variants. Check for end-of-life notifications or discontinuation notices prior to ordering. Ensure the ordering suffix matches the required physical package type for your PCB layout.

Selection Notes

Select this component for applications requiring a low-power, single-channel voice codec with built-in amplification. Verify that the system master clock falls within the supported range of 256 kHz to 4.096 MHz. Ensure the host processor supports one of the four specified PCM interface timing modes. Confirm that the 4.5V to 5.5V supply voltage aligns with the target system's power rails.

Part Context

The W681512 series serves as a general-purpose voiceband codec solution for telecommunications. It is functionally comparable to legacy parts like the Motorola MC145480. The device integrates anti-aliasing and smoothing filters compliant with ITU-T G.712, reducing external component count. It is suitable for industrial temperature ranges from -40°C to +85°C.

Replacement Considerations

Cross-reference with Motorola MC145480 and MC14LC5480 for functional compatibility. Verify pinout and electrical characteristics match before substitution.