PEF 20954 HT V1.1

Telecom Overview

The Infineon PEF 20954 HT V1.1 is a Smart Integrated Digital Echo Canceller (SIDEC) designed for telecommunication networks to suppress electrical and acoustical echoes. It supports PCM input/output interfaces at 2.048 MHz with selectable µ- and A-Law coding per ITU G.711. The device provides independent voiceband echo cancellation compliant with ITU G.165 and G.168, handling up to 32 channels with end echo path delays under 63.75 ms, or 16 channels with delays under 127.75 ms. It features an integrated Universal Control and Communication Interface (UCCI), a flexible microprocessor interface, and boundary scan capabilities. Operating on a 3.3 V supply with 5V tolerant inputs, it dissipates approximately 900 mW and is available in P-TQFP-144-8 and P-LFBGA-160-2 packages.

Telecom Feature Summary

• Patented adaptive algorithm ensures rapid convergence even during background noise presence.
• Integrated Non Linear Processor controlled by echoloss, echo path delay, and background noise levels.
• Supports Channel Associated Signaling (CAS) BR transparency in the send path.
• Includes maskable disabling functions for tone detection and continuity checks.

Telecom Applications

• Circuit Emulation Service (CES) carried over Asynchronous Transfer Mode (ATM).
• Voice over IP (VoIP) gateways requiring echo suppression for packetized voice signals.
• Private Branch Exchange (PBX) systems for near-end echo cancellation.

Telecom Procurement Notes

Verify the specific suffix against the ordering table to confirm package type and temperature range. The HT variant denotes commercial or extended industrial ranges in the P-TQFP-144-8 package, while the E variant utilizes the P-LFBGA-160-2 package. Ensure compatibility with existing system clock modes and power supply requirements before integration.

Telecom Selection Notes

Select the PEF 20954 HT for applications requiring the plastic quad flat pack package. Choose based on the required operating temperature range and channel count constraints. Verify that the host system supports the necessary serial or microprocessor interfaces for configuration and monitoring of the internal states and coefficients.

Telecom Part Context

This component belongs to the SIDEC family of digital signal processing devices from Infineon Technologies. It is engineered using CMOS technology specifically for high-performance echo suppression in terrestrial and wireless communication links. The device addresses transmission quality issues caused by hybrid splits and imperfect terminations as defined by ITU-T recommendations.

Telecom Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official Infineon resources for legacy replacement guidance or cross-reference with newer generations of echo cancellers if pin compatibility is not required.

Telecom FAQ

What is the maximum echo path delay supported by the device?

The device can cancel end echo paths with delays of less than 63.75 ms for 32 channels, or less than 127.75 ms for 16 channels.

How does the device handle double talk scenarios?

It incorporates detection of double talk to control adaptive convergence, ensuring stable performance when both parties speak simultaneously.

Is the device compatible with standard telephony coding laws?

Yes, it supports selectable µ- and A-Law coding according to ITU G.711, with options for global or per-channel conversion.