Analog Devices Inc./Maxim Integrated MAX3880ECB+TD

Overview

MAX3880ECB+TD from Maxim Integrated is a 2.488Gbps SDH/SONET 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 extraction, operates from a single +3.3V supply, consumes 910mW, and supports system loopback diagnostics via dual serial inputs - deployed in add/drop multiplexers and digital cross-connects.

For engineers reviewing the MAX3880ECB+TD datasheet, MAX3880ECB+TD pinout, MAX3880ECB+TD application, or MAX3880ECB+TD equivalent, key selection criteria include its 2.488Gbps serial input compliance, LVDS parallel output timing (tCLK-Q = 200–450ps), >2000 consecutive identical digits tolerance, -40°C to +85°C extended temperature range, and 64-pin TQFP-EP package with exposed thermal pad.

Technical Context

The MAX3880ECB+TD implements a fully differential architecture with an on-chip LC VCO running at 2.488GHz, phase/frequency detector (PFD), and digital frequency detector (FD) for rapid lock acquisition. Its PLL recovers clock from serial data without external reference, enabling retiming with sub-UI jitter performance.

It supports two independent 2.488Gbps differential inputs (SDI± and SLBI±), TTL-controlled signal selection (SIS), and LVDS synchronization inputs (SYNC±) that realign output data within two PCLK cycles by dropping one bit. The LOL monitor provides TTL-active-low loss-of-lock indication valid only when data is present.

Key Specifications

Pinout & Package

MAX3880ECB+TD is housed in a 64-pin TQFP-EP (exposed pad) package measuring 10mm × 10mm × 1.0mm, with the exposed pad soldered to PCB ground for thermal conduction and EMI control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX3880ECB+ and MAX3881ECB+, the MAX3880ECB+TD offers identical core functionality and reliability but includes enhanced thermal management via the exposed pad - critical for sustained operation in fanless telecom chassis where junction temperature must stay below 115°C.

Availability

MAX3880ECB+TD is available at Aetrix Electronics and suitable for SDH/SONET transmission systems, add/drop multiplexers, and digital cross-connects requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX3880ECB+TD 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) designs precision analog, mixed-signal, and high-speed communication ICs for industrial, telecom, and computing markets.

The MAX3880ECB+TD belongs to Maxim's high-speed communications product line, engineered specifically for SDH/SONET physical layer interfacing with emphasis on jitter performance, power efficiency, and system-level diagnostic capability.

FAQ

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

The MAX3880ECB+TD functions as a 2.488Gbps serial-to-16-bit-parallel deserializer with integrated clock recovery. It extracts timing from the incoming NRZ data stream using an on-chip PLL, then retimes and outputs low-jitter LVDS parallel data and clock for framer or switch fabric interface. This enables direct connection to ASICs or FPGAs without external clock clean-up circuitry - a core requirement in STM-16/OC-48 line cards.

Does the MAX3880ECB+TD support system-level loopback testing?

Yes, the MAX3880ECB+TD includes dedicated SLBI+ and SLBI- inputs for system loopback diagnostics. When the TTL SIS pin is driven high, the device routes the loopback input instead of the main SDI± stream. This allows full end-to-end validation of transceiver chains - for example, connecting a MAX3890 serializer output directly to the MAX3880ECB+TD SLBI± pins - without modifying PCB routing or adding external switches.

How does the SYNC± functionality improve data alignment in the MAX3880ECB+TD?

The SYNC± inputs on the MAX3880ECB+TD provide hardware-assisted data realignment: pulsing SYNC high for ≥4 serial bit periods (≥1.6ns) causes the device to drop one bit and shift the 16-bit parallel word alignment relative to PCLK. Realignment completes within two PCLK cycles, enabling hitless frame repositioning during network reconfiguration - essential for maintaining service continuity in SONET ADMs and DCS platforms.

What thermal considerations apply to the MAX3880ECB+TD's exposed pad?

The MAX3880ECB+TD's exposed pad (EP) must be soldered to a PCB ground plane to ensure proper thermal dissipation. With 910mW typical power consumption, the pad reduces junction-to-board thermal resistance, preventing overheating in compact telecom modules. Failure to connect the EP compromises both thermal performance and EMI shielding - the datasheet specifies mandatory soldering and recommends multiple thermal vias to inner ground layers.

Can the MAX3880ECB+TD operate with input signals below 50mV_p-p?

Yes, the MAX3880ECB+TD maintains BER < 1×10⁻¹⁰ down to 9.5mV_p-p differential input amplitude, though jitter tolerance degrades below 50mV_p-p. At 25mV_p-p, jitter tolerance remains above SDH/SONET specification (0.15UI), making it viable for links with significant optical attenuation. Input sensitivity is enabled by its low-noise differential amplifier architecture and adaptive threshold design.