Re: Other LVDS Benefits
Very good point the economics also comes into it.
JezmoSSL
7/7/2012 3:31:24 PM
User Rank Blogger
Re: Other LVDS Benefits
I use 100 Mhz LVDS serdes links to tranfer multiplexed audio and control data to peripheral cards driven by our mixing desks, we actualy use two bidirectional links and two word clock/sync channels. Tranfering the same data over two parallel channels would take a 'lot' of io pins and would require far more resources.
Other LVDS Benefits
Great article, it is often easy as a designer to get stuck in the mindset of I need more pins therefore a larger device. Of course higher pin counts can cause qulaification and relaibility issues for some high rel applications so this provides a very simple method to get around those issues.
As with LVDS you are sending data serially it is also easier to detect phyiscal layer faults with the connection than a parallel bus. For example on a parallel ADC you would have difficulty spotting the lsb was stick high or low. However, if the LVDS pair goes short or open circuit the end application normally prety quickly can determine there is an error.
Re: Who would have thunk?
@William: I honestly bet that there are going to be a lot of designers who run across this column and say "Duh!" to themselves, realizing that they could have used this technique to solve a problem they had been beating their brains over...
Re: Who would have thunk?
Thanks Max -- It's also a good way to cut down on the need for a bulky parallel cable. Just an LVDS Cat-5 cable like Fire-Wire will work.
Who would have thunk?
Hi William -- thanks so much for this -- it reminds me once again that there's always something new to learn. I knew about the FPGA LVDS outputs, of course, but it had bever struck me that you could purchase off-the-shelf LVDS to regular output de-multiplecers and regular input to LVDS multiplexers ... GREAT ARTICLE!!!
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