作者：Intersil 文章来源：Intersil
Intersil 公司的MegaQ ISL5960x系列是单路自适应视频均衡器,适用于长达1600米的Cat 5/6电表缆和长达6000英尺(1800米)的RG-59电缆,可以补偿电缆损耗达60dB,源放大变化±3dB.器件单电源5V工作,能为两个75欧姆负载提供2VP-P输出,能和彩色或单色,NTSC或PAL信号兼容,主要应用在视频监视和视频分配.本文介绍了ISL5960x系列主要特性,方框图, 典型应用电路图以及ISL59605-SPI-EVALZ评估板电路图和材料清单.
The ISL59601, ISL59602, ISL59603, ISL59604, and ISL59605 (the “MegaQ
” product family) are single-channel adaptive equalizers designed to automatically compensate for long runs of Cat 5/6 or RG-59 cable, producing high quality video output with no user interaction. The ISL59601 equalizes Cat 5/6 up to a distance of 1000 feet (300 meters), while the ISL59605 equalizes up to 5300 feet (1600 meters).
MegaQ compensates for high frequency cable losses of up to 60dB (ISL59605) at 5MHz as well as source amplitude variations up to ±3dB.
The ISL59601, ISL59602, ISL59603, ISL59604, and ISL59605 operate from a single +5V supply. Inputs are AC-coupled and internally DC-restored. The output can drive 2VP-P into two source-terminated 75Ω loads (AC-coupled or DC-coupled).
ISL5960x主要特性:
• ISL59605 Equalizes Up to 1 Mile (1600m) of Cat 5/6 and Up to 6000 Feet (1800m) of RG-59
• Fully Automatic, Stand-Alone Operation - No User Adjustment Required
• ±8kV ESD Protection on All Inputs
• Automatic Cable Type Compensation
• Compatible with Color or Monochrome, NTSC or PAL Signals
• Automatic Polarity Detection and Inversion
• Compensates for ±3dB Source Variation (in Addition to Cable Losses)
• Optional Serial Interface Adds Additional Functionality
• 5MHz -3dB Bandwidth
• Works with Single-Ended or Differential Inputs
• Output Drives Up to Two 150Ω Video Loads
ISL5960x应用:
• Surveillance Video
• Video Distribution
图1. ISL5960x系列方框图
图2. ISL5960x系列典型应用电路图
图3. ISL59605-SPI-EVALZ评估板采用UTP电缆的应用电路图(串行接口)
ISL59605-SPI-EVALZ评估板
The ISL59605-SPI-EVALZ board is designed to allow evaluation of the ISL5960x (MegaQ) family of parts, as well as provide the reference schematic and PCB layout of a MegaQ implementation on a 4-layer PCB. In addition to the MegaQ equalization path, the board features a USB interface that allows access to and control of MegaQ internal configuration registers, enabling a few more features than are available when using the stand-alone configuration。
图4.ISL59605-SPI-EVALZ评估板外形图
图5.ISL59605-SPI-EVALZ评估板电路图
ISL59605-SPI-EVALZ评估板材料清单(BOM):