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| NS低抖动LVDS FPGA接口方案 | |||||
作者：NS 文章来源：NS 点击数： 更新时间：2008-6-3  |
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The DS32EL0421/DS32ELX0421 is a 125 MHz to 312.5 MHz (DDR) serializer for high-speed serial transmission over FR-4 printed circuit board backplanes, balanced cables, and optical fiber. This easy-to-use chipset integrates advanced signal and clock conditioning functions, with an FPGA friendly interface. The DS32EL0421/DS32ELX0421 serializes up to 5 parallel input LVDS channels to create a maximum data payload of 3.125 Gbps. If the integrated DC-balance encoding is enabled, the maximum data payload achievable is 2.5 Gbps. The DS32EL0421/DS32ELX0421 serializers feature remote sense capability to automatically detect and negotiate link status with its companion DS32EL0124/DS32ELX0124 deserializers without requiring an additional feedback path. The parallel LVDS interface reduces FPGA I/O pins, board trace count and alleviates EMI issues, when compared to traditional single-ended wide bus interfaces. The DS32EL0421/DS32ELX0421 is programmable through a SMBus interface as well as through control pins. 主要特性: ■ 5-bit LVDS parallel data interface ■ Programmable transmit de-emphasis ■ Configurable output levels (VOD) ■ Selectable DC-balanced encoder ■ Selectable data scrambler ■ Remote Sense for automatic detection and negotiation of link status ■ On chip LC VCOs ■ Redundant serial output (ELX device only) ■ Data valid signaling to assist with synchronization of multiple receivers ■ Supports AC- and DC-coupled signaling ■ Integrated CML and LVDS terminations ■ Configurable PLL loop bandwidth ■ Programmable output termination (50Ω or 75Ω). ■ Built-in test pattern generator ■ Loss of lock and error reporting ■ Configurable via SMBus ■ 48-pin LLP package with exposed DAP  关键的指标: ■ 1.25 to 3.125 Gbps serial data rate ■ 125 to 312.5 MHz DDR parallel clock ■ -40° to +85°C temperature range ■ >8 kV ESD (HBM) protection ■ Low Intrinsic Jitter — 35ps at 3.125 Gbps 目标应用: ■ Imaging: Industrial, Medical Security, Printers ■ Displays: LED walls, Commercial ■ Video Transport ■ Communication Systems ■ Test and Measurement ■ Industrial Bus  图1.典型应用  图2. DS32ELX0421典型的接口电路 详情请见: >http://cache.national.com/ds/DS/DS32EL0421.pdf |
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