Infineon Technologies PEF 24902 H V2.1

Overview

PEF 24902 H V2.1 from Infineon Technologies is a quad-channel ISDN analog front-end (AFE) with integrated echo cancellation, designed for splitterless FDD ADSL-over-ISDN linecards in central office, DSLAM, and DLC systems. It supports both 4B3T (PSD mask down to 138 kHz) and 2B1Q (PSD mask down to 120 kHz) ADSL-friendly signaling, includes a digital transmit low-pass filter eliminating external passive splitters, and operates with a 15.36 MHz master clock derived from an on-chip PLL.

For engineers reviewing the PEF 24902 H V2.1 datasheet, PEF 24902 H V2.1 pinout, PEF 24902 H V2.1 application, or PEF 24902 H V2.1 equivalent, key selection criteria include ISDN port impedance matching (Z_ISDN = 135 Ω || 12 nF), ADSL port spectral compliance, boundary-scan testability (IEEE 1149.1), and serial control interface (SCI) compatibility with GEMINAX MAX host controllers.

Technical Context

The IEC-4-AFE-X implements four independent ISDN B-channel analog signal paths, each with differential line interface, 12-bit ADC (72 dB SNR), 12-bit DAC, and programmable gain amplifiers. Its digital low-pass filter meets ITU-T G.992.1 (ADSL) spectral masks when paired with GEMINAX MAX, enabling full-duplex operation without external analog splitters.

PLL-based clock generation locks to a 2.048 MHz reference to produce 15.36 MHz (×7.5) for digital signal processing, with jitter transfer gain ≤ –30 dB at 1 kHz and phase deviation < 2° for sinusoidal input jitter up to 100 kHz. Boundary scan support enables IEEE 1149.1-compliant production testing across all 64 pins.

Key Specifications

Pinout & Package

PEF 24902 H V2.1 is housed in a P-MQFP-64-9 HS (Plastic Metric Quad Flat Package), 64-pin, 10 mm × 10 mm body, 0.5 mm pitch, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad ISDN AFE applications.

Compared with PEF 24902 H V2.1, the V3.2 revision adds verified 2B1Q power metrics and clarifies reset behavior of the digital LPF, while PEB 24902 offers identical electrical performance with alternate part-numbering for logistics segmentation - both retain full compatibility with GEMINAX MAX-based systems.

Availability

PEF 24902 H V2.1 is available at Aetrix Electronics and suitable for DSLAM linecards, central office gateways, DLC remote terminals, and ISDN/ADSL hybrid CPE requiring stable component supply across extended product lifecycles.

Supply support for PEF 24902 H V2.1 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, and wireline communications ICs, with global R&D centers and wafer fabs.

The IEC-4-AFE-X product line delivers integrated analog front-ends for splitterless ADSL-over-ISDN systems, targeting carrier infrastructure where spectral compliance, echo cancellation accuracy, and testability are critical.

FAQ

What is the purpose of the CL15 pin?

The CL15 pin outputs the internally generated 15.36 MHz master clock, derived from a PLL locked to the 2.048 MHz reference input. This clock synchronizes the ADC/DAC sampling, digital filter operation, and serial interface timing. It drives external devices such as the GEMINAX MAX DSP and must be terminated with a 50 Ω resistor to avoid signal integrity issues.

Does PEF 24902 H V2.1 support both 2B1Q and 4B3T ISDN line coding?

Yes - the device supports both 2B1Q and 4B3T modes via configurable digital interface framing and corresponding PSD mask compliance. Electrical characteristics for 2B1Q operation (e.g., average transmit power, power consumption) are explicitly specified in Revision 1 of the datasheet, confirming full dual-mode capability.

How does the integrated digital low-pass filter eliminate the need for external splitters?

The on-chip FIR-based digital low-pass filter shapes the transmit spectrum to meet ITU-T G.992.1 ADSL US bandplan requirements (≤ –60 dBm/Hz at 138 kHz for 4B3T, 120 kHz for 2B1Q), replacing the traditional analog LC splitter. This removes insertion loss, component tolerance drift, and board space associated with discrete passive networks.

Is boundary scan supported, and what standards does it comply with?

Yes - PEF 24902 H V2.1 includes a full IEEE 1149.1-compliant boundary scan test controller with TCK, TMS, TDI, TDO, and TST pins. The 64-pin scan chain supports INTEST, EXTEST, SAMPLE/PRELOAD, and BYPASS instructions, enabling automated PCB test and interconnect verification during manufacturing.