NS 公司的DS50EV401 是低功耗高速PCI Express可编程均衡器，器件提供两种均衡设置，以降低由于各种媒体内部连接所引起的内部符号干扰(ISI)：一种设定用于PCIe Gen1 和Gen2，另一种用于未来的Gen3数据速率。它能对10米PCIe电缆或40英寸FR-4 PCB导线对速率高达5 Gbps的信号提升20 dB接收性能，广泛应用于网络存储设备（SAN），交换架构，通信基础设备以及自动测试设备（ATE）。本文介绍了DS50EV401的主要性能，技术參数，方框图以及典型应用电路。
The DS50EV401 is a low power, programmable equalizer specifically designed for PCI Express applications. The device provides 2 equalization settings to reduce inter-symbol interference (ISI) induced by a variety of interconnect media. One setting is optimized for PCIe Gen1 and Gen2 applications; the other is optimized for future Gen3 data rates. In all modes, the equalizer can operate, error free, with an input eye that is completely closed by interconnect ISI. A single pin, MODE, allows the user to change between these two modes.
The DS50EV401 enables PCI Express compatible link extension by supporting transmit electrical idle, and Beacon signal pass through on a per lane basis. Current-mode logic (CML) is used on both input and output terminals, which provide constant 50 ohm single-ended impedance to AC ground. Differential signaling is implemented through out the entire signal path to minimize supply induced jitter. The DS50EV401 is available in a 7mm x 7mm 48-pin leadless LLP package, and is powered from a single power supply of either 3.3 or 2.5V. 
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