基于LMH0395设计的3Gbps HD SDI自适应均衡方

本文介绍了LMH0395主要特性，以及多种应用电路。NS 公司的LMH0395 是3Gbps HD/SD SDI双输出低功耗自适应电缆均衡器，数据速率从125 Mbps 到2.97Gbps，支持SMPTE 424M, SMPTE 292M, SMPTE 344M, SMPTE 259M和DVB-ASI标准，270Mbps时Belden 1694A电缆长度达220米，Belden 1694A电缆长度达400米。双输出的功耗145 mW，单输出的功耗115 mW，主要用在SMPTE 424M, SMPTE 292M, SMPTE 344M和SMPTE 259M串行数字接口以及宽带视频路由器，交换器和分布放大器。

LMH0395主要特性：

■ SMPTE 424M, SMPTE 292M, SMPTE 344M, SMPTE 259M, and DVB-ASI compliant

■ Equalizes up to 200 meters of Belden 1694A at 2.97 Gbps, up to 220 meters of Belden 1694A at 1.485 Gbps, or up to 400 meters of Belden 1694A at 270 Mbps

■ Ultra low power consumption: 145 mW (dual outputs), 115 mW (single output)

■ Dual differential outputs; second output can be independently powered down

■ Power save mode with auto sleep control (16 mW typical power consumption in power save mode)

■ Output de-emphasis to compensate for FR4 board trace losses

■ Digital and analog programmable MUTEREF threshold control

■ Optional SPI register access

■ Wide range of data rates: 125 Mbps to 2.97 Gbps

■ Internally terminated 100Ω LVDS outputs with programmable output common mode voltage and swing

■ Programmable launch amplitude optimization

■ Cable length indicator

■ Single 2.5V supply operation

■ 24-pin LLP package

■ Industrial temperature range: −40℃ to +85℃

LMH0395应用：

■ SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE 259M serial digital interfaces

■ Broadcast Video routers, switchers, and distribution Amplifiers


图1。LMH0395方框图（Pin 模式）

图2。LMH0395典型应用方框图（Pin 模式）

图3。LMH0395 DC输出和时钟恢复器LMH0346接口框图

图4。LMH0395 DC输出和时钟恢复器LMH0356接口框图

图5。LMH0395 SPI菊花链接系统架构图

图6。LMH0395 应用电路图（SPI模式）