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the lmh12x9 (lmh1229, lmh1239) is a long reach adaptive cable equalizer with integrated reclocker, dual outputs, and 75ω loop-through output. the device is designed to equalize data transmitted over 75ω coaxial cable and operates across smpte data rates ranging from 125mbps to 11.88gbps.
the adaptive equalizer at the sdi input enables automatic loss compensation for up to 100m belden 1694a cable reach in 4k/8k video applications where 12g-sdi (11.88gbps) is used. the integrated reclocker attenuates high frequency jitter and fully regenerates the data using a clean, low-jitter clock. the loop filter of the reclocker is adjustable with optional external capacitor for sdi cascade applications.
for routing simplicity and debug, the lmh12x9 features a 1:3 output mux consisting of two 100ω fanouts with vod and de-emphasis control and one 75ω loop-through sdi output. the 75ω loop-through output is provided to extend the signal reach or enable system-level diagnostics.
the lmh12x9 features internal integrated return loss networks that meet stringent smpte specifications across all data rates. the lmh12x9 also has an internal eye opening monitor and a programmable pin for cdr lock indication, input carrier detect, cable fault detection, or hardware interrupts to support system diagnostics and board bring-up.
the lmh1229 is pin compatible with the lmh1297 (12g uhd-sdi bidirectional i/o with integrated reclocker) when used in cable equalizer applications. for system-level redundancy, the lmh1239 is offered with an additional integrated sdi input mux.
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
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* | 数据表 | | | 2024年 6月 1日 |
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lmh1239 是一款具有集成时钟恢复器、双输入、双输出和 75ω 环通输出的远距离自适应电缆均衡器。该器件旨在均衡通过 75ω 同轴电缆传输的数据,并可在 125mbps 至 11.88gbps 的 smpte 数据速率范围内运行。sdi 输入端的自适应均衡器可在使用 12g-sdi (11.88gbps) 的 4k 和 8k 视频应用中,自动补偿长达 100m belden1694a 电缆的信号损耗。集成时钟恢复器可减弱高频抖动并使用纯净的低抖动时钟完全重新生成数据。时钟恢复器环路滤波器可供调节,并且针对 sdi 级联应用提供了可选外部电容器。
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封装 | 引脚 | cad 符号、封装和 3d 模型 |
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