Analog Devices Inc./Maxim Integrated 78P2241B-IGT/F

Overview

78P2241B-IGT/F from Teridian Semiconductor is a single-chip E3/DS3/STS-1 line interface transceiver IC with integrated clock recovery, adaptive equalization, B3ZS/HDB3 ENDEC, and line-code violation detection. It operates at 34.368 Mbps (E3), 44.736 Mbps (DS3), or 51.84 Mbps (STS-1), supports 75-Ω coaxial cable up to 1100 ft, and delivers <0.1 UI transmit jitter while meeting ANSI T1.102-1993, ITU-T G.703, and Telcordia GR-499-CORE standards. It serves in DSLAMs, SONET add/drop multiplexers, and ATM WAN access routers.

For engineers reviewing the 78P2241B-IGT/F datasheet, 78P2241B-IGT/F pinout, 78P2241B-IGT/F application, or 78P2241B-IGT/F equivalent, key selection criteria include its dual-voltage (3.3 V/5 V) operation, 28-pin PLCC and 48-pin TQFP package options, selectable RFO-based rate configuration, MON-enabled DSX3 monitor signal reception, and diagnostic loop-back modes for AMI and digital signals.

Technical Context

The 78P2241B-IGT/F implements a phase-locked loop (PLL) with auxiliary frequency-sensitive acquisition for reference-free clock recovery from B3ZS- or HDB3-coded AMI signals. Its adaptive equalizer compensates for >12 dB cable loss and 6 dB flat loss, enabling robust reception over long coaxial runs.

Transmit functionality includes programmable pulse shaping via E# pin selection (E3/DS3/STS-1), LBO-controlled amplitude scaling for cable lengths ≥225 ft, and selectable ENDEC for NRZ-to-AMI encoding. The IC supports transformer- or capacitor-coupled inputs and outputs differential AMI signals on LOUT+/LOUT− with 301-Ω termination and 1:2 center-tapped transformer drive.

Key Specifications

Pinout & Package

The 78P2241B-IGT/F is housed in a 48-pin TQFP (JEDEC LQFP) package, RoHS-compliant and lead-free, with exposed pad for thermal management. Pin 1 is marked by index corner; body dimensions are 9.3 × 9.3 mm, 1.6 mm max height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar line interface transceiver applications.

Compared with 78P2241-IGT, the 78P2241B-IGT/F adds RoHS compliance without performance trade-offs; compared with 78P7200L, it delivers enhanced diagnostics, flexible interfacing, and broader standard support-making it suitable for next-generation telecom infrastructure where reliability, regulatory compliance, and feature density are critical.

Availability

78P2241B-IGT/F is available at Aetrix Electronics and suitable for DSLAM line cards, SONET add/drop multiplexers, and ATM WAN access routers requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 78P2241B-IGT/F 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

Teridian Semiconductor Corporation was a fabless analog/mixed-signal IC designer specializing in precision timing, power measurement, and telecom interface solutions before its acquisition by Maxim Integrated in 2010.

The 78P2241B-IGT/F belongs to Teridian's high-speed line interface product line, engineered specifically for carrier-grade E3/DS3/STS-1 physical layer implementation in access and aggregation equipment.

FAQ

What data rates does the 78P2241B-IGT/F support, and how are they selected?

The 78P2241B-IGT/F supports 34.368 Mbps (E3), 44.736 Mbps (DS3), and 51.84 Mbps (STS-1). Rate selection is determined by the RFO bias resistor value (6.81 kΩ for E3, 5.23 kΩ for DS3, 4.53 kΩ for STS-1) and the E# pin state (low for E3, high for DS3, float for STS-1). These settings configure the PLL center frequency and transmitter pulse shape to meet respective standard templates.

Does the 78P2241B-IGT/F require an external crystal or reference clock?

No, the 78P2241B-IGT/F uses a unique reference-free clock recovery architecture with a phase-locked loop and auxiliary acquisition circuit. It recovers clock and data directly from the incoming B3ZS- or HDB3-coded AMI signal without any external crystal oscillator or reference clock source-reducing system cost and complexity.

How does the MON pin affect receiver sensitivity in the 78P2241B-IGT/F?

When the MON pin is driven high, the 78P2241B-IGT/F activates an additional 20 dB gain stage in the receiver path, enabling detection of low-amplitude DSX3 or E3 monitor signals (25–80 mV_pk). In normal mode (MON low), the input range is 90–1200 mV_pk for DS3/STS-1 or 104–1200 mV_pk for E3, allowing flexible use across live line and test port applications.

What loop-back modes does the 78P2241B-IGT/F support, and how are they configured?

The 78P2241B-IGT/F supports local loop-back (LLB) and remote loop-back (RLB) via the LPBK pin. LLB (LPBK low) routes LOUT+/LOUT− internally to LIN+/LIN− for transmitter-path validation. RLB (LPBK float) connects RPOS/RNEG/RCLK to TPOS/TNEG/TCLK for end-to-end bit continuity testing. LPBK high disables loop-back for normal operation.

Is the 78P2241B-IGT/F pin-compatible with earlier Teridian line interface ICs?

Yes-the 78P2241B-IGT/F in 48-pin TQFP is pin-compatible with the 78P2241 in the same package. Its 28-pin PLCC variant (78P2241B-IH/F) is pin- and functionally compatible with the 78P7200L and original 78P2241 (28-pin PLCC), enabling drop-in upgrades with added features including ENDEC, line-code violation detection, and MON functionality.