Analog Devices Inc./Maxim Integrated MAX3880ECB+

Overview

The MAX3880ECB+ from Maxim Integrated is a 2.488Gbps SDH/SONET 1:16 deserializer with integrated clock recovery, designed to convert high-speed serial NRZ data into 16-bit-wide 155Mbps LVDS parallel outputs for telecom transmission systems. It features a fully integrated PLL, operates from a single +3.3V supply, consumes 910mW, and supports system loopback diagnostics via dual serial inputs (SDI± and SLBI±).

For engineers reviewing the MAX3880ECB+ datasheet, MAX3880ECB+ pinout, MAX3880ECB+ application, or MAX3880ECB+ equivalent, this device is selected for precise jitter-critical SDH/SONET add/drop multiplexers, digital cross-connects, and timing-sensitive optical line interface designs requiring sub-0.46UIp-p jitter tolerance and >2000 consecutive identical digits handling.

Technical Context

The MAX3880ECB+ implements a fully differential architecture with an on-chip LC VCO running at 2.488GHz, phase/frequency detector, and digital frequency detector for rapid lock acquisition. Its PLL recovers clock from serial data without external reference, enabling retiming with <450ps clock-to-data delay variation across temperature.

It integrates dual LVDS input paths (main SDI± and diagnostic SLBI±), TTL-selectable signal routing (SIS), and LVDS synchronization inputs (SYNC±) that realign output data within two PCLK cycles by dropping one bit. The internal loop filter requires a 1.0µF capacitor between FIL+ and FIL− to set damping ratio.

Key Specifications

Pinout & Package

MAX3880ECB+ 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 performance 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+, MAX3890ECB+ serves as its matched serializer partner rather than substitute, while LMH0384SQ/NOPB addresses broadcast video timing-not SDH/SONET compliance-making MAX3880ECB+ irreplaceable for telecom-grade jitter-critical line interfaces.

Availability

MAX3880ECB+ is available at Aetrix Electronics and suitable for OC-48 line interface cards, add/drop multiplexers, and digital cross-connect systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

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 product line, engineered specifically for SDH/SONET OC-48/STM-16 physical layer interfacing with emphasis on jitter performance, power efficiency, and system diagnostics.

FAQ

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

The MAX3880ECB+ functions as a 2.488Gbps serial-to-16-bit-parallel deserializer with integrated clock recovery. It extracts a synchronous clock from the incoming OC-48 serial data stream and retimes the data for reliable parallel transfer to framer or FPGA logic. Its jitter performance exceeds ITU-T G.823 and Bellcore GR-1378 standards, making it essential for telecom line interface cards where timing integrity is critical. The MAX3880ECB+ also supports system loopback diagnostics via its SLBI± inputs.

Does the MAX3880ECB+ require an external clock source?

No, the MAX3880ECB+ does not require an external clock source. It incorporates a fully integrated phase-locked loop (PLL) with an on-chip LC VCO operating at 2.488GHz, enabling autonomous clock recovery directly from the serial NRZ data input. This eliminates dependency on external timing references and simplifies system design in SDH/SONET equipment. The MAX3880ECB+ uses only a 1.0µF capacitor on FIL+/FIL− to configure loop dynamics.

How does the MAX3880ECB+ handle loss-of-lock detection?

The MAX3880ECB+ includes a dedicated TTL-compatible loss-of-lock (LOL) output (pin 63) that asserts low when the PLL loses frequency or phase lock. This signal has an internal 10kΩ pull-up resistor and responds within ~800ns after lock loss. Importantly, the LOL monitor is only valid when a serial data stream is present on SDI± or SLBI±; it does not indicate power failure or missing input signal. The MAX3880ECB+ specification confirms LOL validity is conditional on active data presence.

What is the purpose of the SYNC+ and SYNC− pins on the MAX3880ECB+?

The SYNC+ and SYNC− pins on the MAX3880ECB+ provide LVDS-synchronized bit-slip control to realign the parallel output word relative to the recovered clock. Applying a high pulse ≥4 serial bit periods (≥1.6ns) shifts data alignment by dropping one bit, guaranteeing realignment within two complete PCLK cycles. This feature enables precise frame boundary adjustment during system initialization or error recovery. The MAX3880ECB+ datasheet specifies SYNC functionality is implemented via internal LVDS receivers with 100Ω differential termination.

Can the MAX3880ECB+ operate with PECL-level inputs?

The MAX3880ECB+ accepts differential LVDS inputs (50–800mVp-p), not native PECL. To interface with PECL sources, external attenuation and AC-coupling are required-typically using a 25Ω series resistor per leg and 100Ω termination to VCC, as shown in Figure 7 of the MAX3880ECB+ datasheet. This preserves common-mode level and maintains 50Ω impedance matching. Direct PECL connection will exceed absolute maximum input voltage ratings and risk damage to the MAX3880ECB+.