W6811IR

Overview

The W6811IR is a single-channel PCM CODEC manufactured by Nuvoton Technology Corporation, designed for voiceband signal processing. It supports pin-selectable μ-Law and A-Law companding compliant with ITU G.711 standards. The device operates on separated analog (4.5–5.5V) and digital (2.7–3.3V) power supplies, with typical power dissipation of 25 mW and 0.5 mW in power-down mode. It features fully-differential analog circuits, an on-chip 1.575 V precision reference, and push-pull amplifiers capable of driving 300 Ω loads. Supported master clock rates range from 256 kHz to 4.096 MHz. The component meets ITU G.712 filtering specifications and functions within an industrial temperature range of –40°C to +85°C.

Feature Summary

• Supports pin-selectable μ-Law and A-Law companding for standardized voice digitization
• Integrates fully-differential analog design with on-chip precision voltage reference
• Includes push-pull power amplifiers with external gain adjustment capabilities
• Complies with ITU G.712 specifications for A/D and D/A filtering

Applications

• Digital telephone systems and central office equipment gateways
• PBX and PABX/SOHO system implementations
• VoIP terminals and enterprise telephones
• Analog line cards and ISDN terminals

Procurement Notes

Verify the manufacturer designation as Nuvoton Technology Corporation, noting that Winbond also produces a functionally identical part under the same model number. Confirm the suffix 'IR' corresponds to the specified industrial temperature range and package type. Request the official datasheet to validate pin configurations and electrical characteristics against specific system requirements before procurement.

Selection Notes

Select this component for applications requiring a single-channel voiceband codec with low power consumption. Ensure the system design accommodates separate analog and digital power rails. Verify compatibility with required companding laws and master clock frequencies. Consider the available package options and ensure the operating environment falls within the specified industrial temperature limits.

Part Context

The W6811 series serves as a general-purpose PCM CODEC for voice signal processing. It is widely utilized in telecommunications infrastructure to handle digitization and reconstruction of voice signals. The device integrates necessary band-limiting and smoothing filters, reducing the need for external components in standard PCM system designs.

Replacement Considerations

The W6811 produced by Winbond is a direct functional equivalent. Verify pinout compatibility and electrical parameter alignment when substituting between manufacturers.