基于LMH0395設(shè)計的3Gbps HD SDI自適應(yīng)均衡方

本文介紹了LMH0395主要特性，以及多種應(yīng)用電路。NS 公司的LMH0395 是3Gbps HD/SD SDI雙輸出低功耗自適應(yīng)電纜均衡器，數(shù)據(jù)速率從125 Mbps 到2.97Gbps，支持SMPTE 424M, SMPTE 292M, SMPTE 344M, SMPTE 259M和DVB-ASI標(biāo)準(zhǔn)，270Mbps時Belden 1694A電纜長度達(dá)220米，Belden 1694A電纜長度達(dá)400米。雙輸出的功耗145 mW，單輸出的功耗115 mW，主要用在SMPTE 424M, SMPTE 292M, SMPTE 344M和SMPTE 259M串行數(shù)字接口以及寬帶視頻路由器，交換器和分布放大器。

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應(yīng)用：

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

■ Broadcast Video routers, switchers, and distribution Amplifiers


圖1。LMH0395方框圖（Pin 模式）

圖2。LMH0395典型應(yīng)用方框圖（Pin 模式）

圖3。LMH0395 DC輸出和時鐘恢復(fù)器LMH0346接口框圖

圖4。LMH0395 DC輸出和時鐘恢復(fù)器LMH0356接口框圖

圖5。LMH0395 SPI菊花鏈接系統(tǒng)架構(gòu)圖

圖6。LMH0395 應(yīng)用電路圖（SPI模式）