ADI公司的AD8120是三路寬帶抖動(dòng)補(bǔ)償視頻延遲線,可以進(jìn)行模擬和數(shù)字控制.AD8120包括有三個(gè)延遲通路,寬帶延遲高達(dá)50ns,增量0.8ns,采用64個(gè)數(shù)控點(diǎn)或模擬控制調(diào)整,從而在輸出端最小化噪音和失調(diào)(±30mVRTI).AD8120的帶寬從150MHz到200MHz,增益匹配在0.8%,主要用于UTP電纜傳輸RGB信號(hào),專業(yè)的視頻投映儀和分配,HD視頻,安防視頻和通用寬帶延遲線與鍵盤視頻鼠標(biāo)(KVM).本文介紹了AD8120主要特性,方框圖和典型應(yīng)用電路.TripleSkew-Comp
ADI 公司的AD8120是三路寬帶抖動(dòng)補(bǔ)償視頻延遲線,可以進(jìn)行模擬和數(shù)字控制. AD8120包括有三個(gè)延遲通路,寬帶延遲高達(dá)50ns,增量0.8ns,采用64個(gè)數(shù)控點(diǎn)或模擬控制調(diào)整,從而在輸出端最小化噪音和失調(diào)(±30 mV RTI ).AD8120的帶寬從
150MHz到
200MHz,增益匹配在0.8%,主要用于UTP電纜傳輸RGB信號(hào),專業(yè)的視頻投映儀和分配,HD視頻,安防視頻和通用寬帶延遲線與鍵盤視頻鼠標(biāo)(KVM).本文介紹了AD8120主要特性,方框圖和典型應(yīng)用電路.
Triple Skew-Compensating Video Delay Line with Analog and Digital C
ontrol
The AD8120 is a triple broadband skew-compensating delay line that corrects for time mismatch between video signals incurred by transmission in unshielded twisted pairs of Category 5 and Category 6 type cables. Skew between the individual pairs exists in most types of multipair UTP cables due to the different twist rates that are used for each pair to minimize crosstalk between pairs. For this reason, some pairs are longer than others, and in long cables, the difference in propagation time between two pairs can be well into the tens of nanoseconds.
The AD8120 contains three delay paths that provide broadband delays up to 50 ns, in 0.8 ns increments, using 64 digital control steps or analog control adjustment. The delay technique used in the AD8120 minimizes noise and off
setat the outputs.
The bandwidth of the AD8120 ranges from 150 MHz to 200 MHz, depending on the delay setting. This wide bandwidth makes the AD8120 ideal for use in applications that receive high resolution video over UTP cables.
The logic circuitry of the AD8120 provides individual delay con-trols for each channel. The delay times are set independently using a standard 4-wire SPI bus or a standard I2C bus, or by applying analog control voltages to the VCR, VCG, and VCB pins. Analog control offers a simple solution for systems that do not have digital control available.
The AD8120 is designed to be used with the AD8123 triple UTP equalizer in video over UTP applications,
butit can also be used in other applications where similar controllable broadband delays are required.
The AD8120 is available in a 5 mm × 5 mm, 32-lead LFCSP and is rated to o
perate over the industrial temperature range of −
40℃ to +85℃.
