Infineon Technologies PEB 20954 HT V1.1

Overview

PEB 20954 HT V1.1 from Infineon Technologies is a Smart Integrated Digital Echo Canceller (SIDEC) IC designed for real-time two-wire/four-wire hybrid echo cancellation in voice-over-circuit-emulation and VoIP gateway systems. It supports 32-channel PCM interface, adaptive filter length up to 128 ms, A-law/μ-law conversion, and features integrated NLP, double-talk detection, and stability protection mechanisms. Used in PBX, ATM-based CES, and wireless infrastructure voice processing.

For engineers reviewing the PEB 20954 HT V1.1 datasheet, PEB 20954 HT V1.1 pinout, PEB 20954 HT V1.1 application, or PEB 20954 HT V1.1 equivalent, key selection criteria include echo tail length support, PCM channel count, UCC interface compatibility, microprocessor interface mode (Intel/Motorola), and clock synchronization flexibility across T1/E1 and VoIP timing domains.

Technical Context

The PEB 20954 HT V1.1 implements a fully digital adaptive echo canceller with 128 ms maximum echo path compensation, using LMS-based coefficient adaptation and auxiliary supervision for divergence prevention. Its functional block includes dedicated speech highway control, universal control communication (UCC) interface, and dual-mode microprocessor interface (Intel/Motorola).

It operates with synchronous PCM I/O at 2.048 MHz, 8.192 MHz, or 32.768 MHz reference clocks, supports CAS signaling for T1 systems, and integrates JTAG boundary scan and RAM BIST for testability. The device requires external VCO capture within ±100 ppm for stable clock recovery.

Key Specifications

Pinout & Package

PEB 20954 HT V1.1 is available in two RoHS-compliant packages: P-TQFP-144-8 (144-pin thin quad flat pack, 20 × 20 mm, 0.5 mm pitch) and P-LFBGA-160-2 (160-ball low-profile fine-pitch BGA, 12 × 12 mm, 0.8 mm ball pitch). Both packages support identical functionality and pin mapping per signal group.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital echo cancellation applications.

Compared with PEF 20954 E V1.1, PEB 20954 HT V1.1 adds extended temperature range and thermal reliability for carrier-class deployments; compared with PEB 20955 HT, it offers proven field stability and simpler firmware integration at the cost of shorter echo tail and higher static power draw.

Availability

PEB 20954 HT V1.1 is available at Aetrix Electronics and suitable for VoIP gateways, PBX voice cards, and ATM circuit emulation systems requiring stable component supply, long-term lifecycle assurance, and qualified high-temperature operation.

Supply support for PEB 20954 HT V1.1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive, industrial, and communications ICs, with global R&D and manufacturing infrastructure.

The SIDEC product line targets wireline voice infrastructure, delivering integrated digital echo cancellation optimized for carrier-grade TDM and VoIP interworking applications with minimal external component count.

FAQ

What clock configurations does PEB 20954 HT V1.1 support?

The device supports three primary clock modes: Master Clock (external 32.768 MHz or 8.192 MHz), Slave Clock (synchronized to incoming PCM frame sync), and Reference Clock (2.048 MHz). It also accommodates external VCO capture within ±100 ppm for jitter-tolerant operation in packet-based timing environments.

Does PEB 20954 HT V1.1 require external memory for coefficient storage?

No. All adaptive filter coefficients, configuration registers, and internal state variables are stored in on-chip SRAM. The device contains 128 kbit of embedded RAM dedicated to echo path modeling and control logic, eliminating need for external memory components.

How is double-talk detection implemented in this device?

Double-talk detection uses a dual-threshold energy comparison algorithm comparing near-end and far-end PCM sample power levels across multiple sub-bands. It dynamically adjusts sensitivity based on background noise estimates and includes hysteresis to prevent rapid toggling during transitional speech segments.

Can PEB 20954 HT V1.1 operate in both A-law and μ-law domains simultaneously?

Yes. Channelwise law selection allows independent assignment of A-law or μ-law encoding/decoding per PCM time slot. This enables mixed-law operation on a single device - for example, supporting European (A-law) and North American (μ-law) trunks within the same E1 frame.