[introduction] on the tradition, the demand increases signal to keep apart on high speed interface is a very main task. The data rate that exceeds 250 Mbps commonly exceeded the capacity of smooth Ou and most number isolator. To link of a video, 24 color are transmitted below 60Hz, resolution is 1920 × 1080 (1080p) . If want to undertake to this video link signal is kept apart, we need the isolator of 4.4 Gbps total bandwidth, what just can assure video is fluent transmit.
On the tradition, the demand increases signal to keep apart on high speed interface is a very main task. The data rate that exceeds 250 Mbps commonly exceeded the capacity of smooth Ou and most number isolator.
To link of a video, 24 color are transmitted below 60Hz, resolution is 1920 × 1080 (1080p) . If want to undertake to this video link signal is kept apart, we need the isolator of 4.4 Gbps total bandwidth, what just can assure video is fluent transmit.
Fiber-optic signal keeps apart a solution
Cupreous medium needs to fiber-optic changeover serial implement, one is turned over serial implement with report – smooth converter. The requirement is fiber-optic at the same time have enough bandwidth. Rate of this kind of program is rapid, transmission distance is long, can Sunday run transmits 4K video, but relative cost is very high also.
Signal of graph 1 HDMI arrives fiber-optic (the picture originates ADI)
Special signal keeps apart chip
Use isolator of criterion numeral word to also can come true of course. We move with the speed of 150 Mbps of isolator of every criterion numeral word. This plan still needs serial implement, a solution is strung together implement, if want to realize the total bandwidth of 4.4 Gbps, be equivalent to needing isolator of figure of 30 many levels. Apparent, this kind of plan is not quite sound, we do not continue to discuss went down.
Signal of graph 2 HDMI arrives digital isolator (the picture originates ADI)
Appropriative chip can solve this problem
For instance, difference of low voltage of series of use ADI ADN4654 distributes signal (LVDS) number isolator
Signal of graph 3 HDMI arrives thousand LVDS isolator (the picture originates ADI)
Through using ADN4654 thousand according to rate, can reduce systematic complexity, and use two ADN4654 only can realize 4.4 Gbps bandwidth. Every equipment has two channels, have 4 channels in all, the working rate on every passageway can be as high as 1.1 Gbps.
ADN4654 Demo board
EVAL-CN0422-EBZ is a Plug and Play, be aimed at HDMI 1.3a port, can realize signal segregation. ICoupler? Segregation technology is united in wedlock together, transmit necessary power source and high speed video and control signal through insulation protective screen.
Graph 4 ADN4654 Demo board EVAL-CN0422-EBZ (The picture originates ADI)
The video data in HDMI 1.3a agreement passes 4 TMDS(the smallest change transmission difference to divide) the passageway transmits: 3 data passageway (corresponding Gong Lula) with passageway of a clock. Every driveway must be kept apart alone.
Graph 5 HDMI inspects frequency to be transmitted according to 4 TMDS passageway
If pursue 6, although low voltage of TMDS and LVDS (needs branch) have a bit different, but can use CML (voltaic pattern is logical) , namely the compatibility that a few simple passive component will come to realize as compatible as LVDS equipment.
Graph 6 use simple passive component to realize TMDS and LVDS compatible (the picture originates ADI)
LVDS of thousand ADN4654 segregation sends and receive these passive component and two double passageways implement union is used, in order to keep apart 4 TMDS passageway. Can realize those who be as high as 110 MHz to resemble element clock frequency, support 720 P resolution with the frame rate of 60 Hz.
The method that use signal keeps apart, can lengthen the transmission distance of HDMI. Use special signal to keep apart chip especially, carry HDMI source effectively and between HDMI sink can the safe, join that do not have a confusion of voices, offerred the new option that keeps apart tall bandwidth interface.
Article origin: Get nimble electron DigiKey
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