描述 Description

The MAX3877/MAX3878 are compact, low-power clock recovery and data retiming ICs for 2.488Gbps SONET/ SDH applications. The fully integrated phase-locked loop (PLL) recovers a synchronous clock signal from the serial NRZ data input, which is retimed by the recovered clock. An additional 2.488Gbps serial input is available for system loopback diagnostic testing, or this input can be connected to a 155MHz reference clock to maintain a valid clock output in the absence of data transitions. The MAX3877/MAX3878 provide vertical threshold and phase-adjust control to optimize system BER in DWDM applications.
These devices provide both loss-of-lock (active-low LOL) and loss-of-signal (LOS) monitors. Differential CML outputs are provided for both clock and data signals on the MAX3877, and differential PECL outputs are provided for clock and data signals on the MAX3878.
The MAX3877/MAX3878 are designed for both section-regenerator and terminal-receiver applications in OC-48/STM-16 transmission systems. Their jitter performance exceeds all of the SONET/SDH specifications. These devices operate from a single +3.0V to +3.6V supply over a -40°C to +85°C temperature range. Typical power consumption is only 540mW with a +3.3V supply (MAX3878). They are available in a 32-pin TQFP-EP package with an exposed pad, as well as in die form.

特性 Features

? Exceeds ANSI, ITU, and Bellcore SONET/SDH Specifications
? Adjustable Input Threshold (±180mV)
? 10mVp-p to 1.2Vp-p Differential Input Range
? 540mW Power Dissipation (at +3.3V)
? Fully Integrated Clock Recovery and Data Retiming
? Optional Holdover Capability (Using External Reference Clock)
? 0.003UIRMS Clock Jitter Generation
? Tolerates >2000 Consecutive Identical Digits
? Additional 2.488Gbps Input for Diagnostic Loopback Testing
? Differential PECL or CML Data and Clock Outputs
? Loss-of-Signal Indicator
? Loss-of-Lock Indicator

應(yīng)用 Application

? 控制器

簡介

MAX3877屬于集成電路（IC）的應(yīng)用特定時鐘/定時。由制造生產(chǎn)的MAX3877應(yīng)用特定時鐘/定時專用時鐘和計時 IC（集成電路）產(chǎn)品族中的產(chǎn)品主要用于執(zhí)行與時間或頻率信息生成和分配相關(guān)的各種操作，適合的設(shè)計環(huán)境較特定，例如 AMD 和 Intel 的中央處理單元 (CPU) 或圖形處理單元 (GPU)、DVD 音頻設(shè)備、藍(lán)光光盤播放器、以太網(wǎng)設(shè)備、PCIe、SATA、光纖通道接口、車載娛樂總線等。