Analog Devices Inc./Maxim Integrated MAX3880ECB

Overview

MAX3880ECB from Maxim Integrated is a 2.488Gbps SDH/SONET 1:16 deserializer with integrated clock recovery, converting serial NRZ data to 16-bit LVDS parallel outputs at 155.52Mbps. It features a fully integrated PLL for jitter-clean clock recovery, operates from a single +3.3V supply, consumes 910mW, and supports system loopback diagnostics via dedicated SLBI± inputs. Used in add/drop multiplexers and digital cross-connects.

For engineers reviewing the MAX3880ECB datasheet, MAX3880ECB pinout, MAX3880ECB application, or MAX3880ECB equivalent, key selection considerations include its 2.488Gbps serial input compliance, -40°C to +85°C extended temperature range, 64-pin TQFP-EP package with exposed pad, LVDS output timing alignment capability, and TTL-compatible loss-of-lock monitoring.

Technical Context

The MAX3880ECB implements a fully differential architecture with an on-chip LC VCO running at 2.488GHz, phase/frequency detector (PFD/FD), and digital frequency acquisition logic that eliminates false locking. Its PLL recovers clock from serial data without external reference, achieving jitter tolerance of 0.46 UI_p-p at >10MHz.

It includes dual high-speed differential inputs (SDI± and SLBI±), LVDS synchronization inputs (SYNC±) enabling bit-level realignment within two PCLK cycles, and phase-adjust pins (PHADJ±) for fine-tuning sampling point alignment to optimize BER. The device tolerates >2000 consecutive identical digits while maintaining BER <1×10⁻¹⁰.

Key Specifications

Pinout & Package

MAX3880ECB is housed in a 64-pin TQFP-EP (exposed pad) package measuring 10mm × 10mm × 1.0mm, with thermal pad soldered to PCB ground for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar deserializer-with-clock-recovery applications.

Compared with MAX3880ECB, the MAX3880ECB+TD offers identical performance with RoHS compliance, while MAX3890ECB serves as a functional complement-not a substitute-for transmit-side serialization in matched transceiver systems.

Availability

MAX3880ECB is available at Aetrix Electronics and suitable for OC-48 add/drop multiplexers, digital cross-connect systems, and SDH/SONET line cards requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX3880ECB 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

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.

The MAX3880ECB belongs to Maxim's high-speed communications interface product line, designed specifically for SDH/SONET OC-48/STM-16 receive-side clock recovery and deserialization in carrier-grade optical transport equipment.

FAQ

What is the primary function of the MAX3880ECB in SDH/SONET systems?

The MAX3880ECB functions as a 2.488Gbps 1:16 deserializer with integrated clock recovery, converting serial OC-48/STM-16 data into 16-bit-wide LVDS parallel outputs at 155.52Mbps. It recovers timing directly from the NRZ data stream using an on-chip PLL, eliminating external clock sources. This makes the MAX3880ECB essential for receive-side signal conditioning in telecom line cards, add/drop multiplexers, and digital cross-connects where jitter performance and deterministic data alignment are critical.

Does the MAX3880ECB support system-level loopback testing?

Yes, the MAX3880ECB supports system-level loopback testing via dedicated SLBI+ and SLBI- inputs. When the TTL-level SIS pin is driven high, the device switches from main SDI± input to the SLBI± path, allowing direct connection to a serializer output (e.g., MAX3890ECB) for end-to-end link validation. This capability enables in-circuit diagnostics without external test equipment, improving manufacturing test coverage and field serviceability of the MAX3880ECB-based system.

What is the role of the SYNC+ and SYNC- pins on the MAX3880ECB?

The SYNC+ and SYNC- pins on the MAX3880ECB are LVDS inputs that trigger deterministic data realignment. A pulse applied to these pins shifts the parallel data word alignment by dropping one bit, guaranteeing realignment within two PCLK cycles. This feature allows precise frame synchronization with downstream logic such as framer ASICs or FPGA-based overhead processors. The MAX3880ECB uses this capability to maintain correct byte/word boundaries in SDH/SONET frames, especially after pointer adjustments or network reconfigurations.

How does the MAX3880ECB handle long strings of identical bits (CIDs)?

The MAX3880ECB tolerates more than 2000 consecutive identical digits (CIDs) while maintaining a bit error rate below 1×10⁻¹⁰. This is achieved through low phase/frequency drift in its LC-VCO-based PLL architecture and robust phase detector design. The MAX3880ECB's CID tolerance ensures reliable operation during SONET/SDH idle periods, overhead fields, and maintenance signals-scenarios where data transitions are infrequent and traditional clock recovery circuits may lose lock or degrade jitter performance.

What package type and thermal considerations apply to the MAX3880ECB?

The MAX3880ECB is packaged in a 64-pin TQFP-EP (exposed pad) measuring 10mm × 10mm × 1.0mm, with the exposed pad required to be soldered to a PCB ground plane for thermal conduction. Its 910mW typical power dissipation necessitates proper copper pour and thermal vias under the pad. The MAX3880ECB's specified operating range of -40°C to +85°C makes it suitable for uncontrolled environments like outdoor cabinets or central office shelves, provided board-level thermal design meets JEDEC JESD51-7 guidelines.