Infineon Technologies PEF 3304 EL V2.1-G

Overview

PEF 3304 EL V2.1-G from Infineon Technologies is a 4-channel analog voice access IC with integrated DSP, designed for VoIP residential gateways and ATAs. It supports G.729A/B/E, G.726 ADPCM (32/16/24/40 kbit/s), G.711, T.38 fax relay, and line echo cancellation up to 128 ms per channel per ITU-T G.168-2002.

For engineers reviewing the PEF 3304 EL V2.1-G datasheet, PEF 3304 EL V2.1-G pinout, PEF 3304 EL V2.1-G application, or PEF 3304 EL V2.1-G equivalent, this device delivers full VoIP packet processing-including AAL2/RTP packetization, adaptive jitter buffer (≤200 ms), integrated DTMF receiver, caller-ID generator/detector (FSK/DTMF), and programmable balanced ringing (up to 85 VRMS).

Technical Context

The PEF 3304 EL V2.1-G implements a dedicated voice-processing DSP core supporting simultaneous operation of four vocoders (e.g., G.729A + G.726 + G.711 + T.38) and real-time AITDF-based line testing per GR-909. Its architecture integrates TDM interface logic, serial PCM I/O, and parallel host interface for direct connection to MIPS-based routers like ADM5120.

It operates in conjunction with Infineon SLIC devices (e.g., PEB 4265, PEB 4264, PEF 4268) via configurable digital interfaces and supports country-independent AC/DC line parameter programming per ITU-T Q.552 and LSSGR specifications.

Key Specifications

Pinout & Package

PEF 3304 EL V2.1-G is housed in a 176-pin Low-Profile Ball Grid Array (LFBGA) package with 0.8 mm ball pitch and 12 × 12 mm body size. Pin assignments are defined in Infineon's PEF3304EL_V21_DS document (Rev. 2.1, Section 3.1), supporting parallel host interface (16-bit data + 22-bit address), serial PCM (TDM), JTAG debug, and SLIC control buses.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel VoIP codec applications.

Compared with PEB 3324 EL and PEF 3314 EL, the PEF 3304 EL V2.1-G offers optimal balance of channel density, external memory independence, and thermal efficiency for single-board 4-line residential gateways-without sacrificing G.168 compliance or T.38 support.

Availability

PEF 3304 EL V2.1-G is available at Aetrix Electronics and suitable for residential VoIP gateways, cable eMTAs, and central office DLC terminals requiring stable component supply, long-lifecycle support, and documented G.168-2002 conformance.

Supply support for PEF 3304 EL V2.1-G 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 MCUs, and wired communications ICs, with global R&D centers and ISO/TS 16949-certified manufacturing.

The VINETIC product line was developed specifically for carrier-class analog telephony over packet networks, targeting CPE and CO infrastructure where deterministic real-time voice processing, regulatory compliance (GR-909, LSSGR), and multi-vocoder concurrency are mandatory.

FAQ

Does PEF 3304 EL V2.1-G require external SDRAM or Flash memory?

No. The device contains 256 KB on-chip code RAM for firmware download and 128 KB data RAM for voice processing buffers. External memory is optional only for non-real-time logging or extended feature sets beyond standard VoIP stack.

What SLIC devices are compatible with PEF 3304 EL V2.1-G?

It supports Infineon's full SLIC portfolio: PEB 4266 (SLIC-P), PEB 4265 (SLIC-E), PEB 4265-2 (SLIC-E2), PEB 4264 (SLIC-S), PEB 4264-2 (SLIC-S2), PEB 4365 (TSLIC-E), PEB 4364 (TSLIC-S), PEB 4262 (SLIC-LCP), and PEF 4268 (SLIC-DC), all via its 3-wire SLIC control bus.

Is T.38 fax relay supported in hardware or firmware?

T.38 fax relay is implemented in the integrated DSP core with hardware-accelerated V.17/V.21/V.27ter/V.29 modulation/demodulation engines. Firmware handles protocol framing, redundancy, and UDP/TCP transport-no host CPU involvement required for real-time fax pass-through.

How is line echo cancellation calibrated for different loop lengths?

Calibration is automatic during initialization using AITDF test sequences. The DSP measures loop impedance and adjusts filter coefficients dynamically; tail length is fixed at 128 ms but convergence time adapts to line characteristics per G.168-2002 Annex D.