Infineon PEF22628EV2: A Comprehensive Technical Overview

The Infineon PEF22628EV2 is a highly integrated, single-chip Subscriber Line Interface Circuit (SLIC) designed for a broad range of telecommunications applications. This component is a cornerstone in modern line card designs for both analog Plain Old Telephone Service (POTS) and Voice over IP (VoIP) terminal adapters and Integrated Access Devices (IADs). Its architecture is engineered to deliver robust performance, superior voice quality, and significant design simplification.

At its core, the PEF22628EV2 is built using Infineon's advanced Bipolar-CMOS (BiCMOS) technology. This process technology enables a unique combination of high-voltage handling capabilities, essential for interfacing with telephone lines, and low-power digital logic for control and programmability. The device integrates all necessary battery feed, overvoltage protection, ringing, supervision, and codec interfacing functions, drastically reducing the external component count and board space required for a complete solution.

A key feature of this SLIC is its programmable feed characteristics. It supports multiple battery voltages and can be configured for various international telephony standards, providing designers with exceptional flexibility. The device offers a complete on-chip ringing solution, including programmable ring-trip detection, which eliminates the need for external ringing generators and associated circuitry, simplifying design and improving reliability.

The interface to the digital world is handled via a PCM system interface, which is compatible with standard PCM highways (2.048 Mbps or 1.544 Mbps). This allows for seamless connection to digital signal processors (DSPs) or voice codecs for processing and packetization of voice data in VoIP systems. Furthermore, the PEF22628EV2 incorporates sophisticated built-in diagnostics and test functions. These capabilities enable remote testing of subscriber lines for faults such as shorts, opens, and leakage, which is critical for maintaining network integrity and reducing operational costs.

Thermal management is another critical aspect addressed by the design. The chip includes thermal overload protection circuitry that safeguards it and the surrounding components under fault conditions, such as excessive current draw or short circuits on the line.

In application, the PEF22628EV2 is typically deployed in central office line cards, digital loop carriers, and VoIP gateways. Its ability to operate with a minimal set of external components makes it an economically attractive and reliable solution for high-density line card designs where space and power efficiency are paramount.

ICGOOODFIND: The Infineon PEF22628EV2 stands out as a highly versatile and integrated SLIC solution. Its blend of programmability, comprehensive feature integration, and robust protection mechanisms makes it an exceptional choice for modern telecommunication infrastructure, enabling designers to create compact, efficient, and reliable line interfaces for both legacy and next-generation networks.

Keywords:

1. SLIC (Subscriber Line Interface Circuit)

2. Programmable Feed

3. PCM Interface

4. On-Chip Ringing

5. Thermal Protection