Design Con 2015
Home    Bloggers    Blogs    Article Archives    Messages    About Us   
Tw  |  Fb  |  In  |  Rss
Jonathan Harris

Understanding JESD204B Link Parameters

Jonathan Harris
jonharris0
jonharris0
9/22/2013 9:07:20 PM
User Rank
Blogger
Re: JESD204B's application
Thanks Brad, perhaps another idea for future blog...

50%
50%
B_Albing
B_Albing
9/22/2013 7:14:24 PM
User Rank
Editor
Re: JESD204B's application
@JH - thanks for providing a bit of addendum material regarding these different methods of outputing data streams.

50%
50%
jonharris0
jonharris0
9/13/2013 3:36:21 PM
User Rank
Blogger
Re: JESD204B's application
These are all great comments and questions!  The progression of output technology in ADCs has gone from CMOS to LVDS as the mainstream technology today.  The JESD204 standard is emerging as the technology of choice for the output interface of ADCs.  In the wealth of ADC applications where sample rate is 250 MSPS and below, you see mainly LVDS.  Some ADCs up to the GSPS range still use LVDS but it gets very ugly in terms of number of I/O and routing.  The real advantage for JESD204 (especially JESD204B) comes from ADCs with sample rates that go above 500 MSPS and into the GSPS range.  It allows the data to be output on much fewer outputs than that required for LVDS.  The trend is looking eerily similar to what happened when things transitioned from CMOS to LVDS.  It is all about speed and the higher sample rate converters need a faster, more efficient interface.  I have a recent article in the Xilinx Xcell journal that discuss some of this.  It is at: http://issuu.com/xcelljournal/docs/xcell_journal_issue_84/48?mode=window&viewMode=doublePage

50%
50%
samicksha
samicksha
9/13/2013 3:33:24 AM
User Rank
Student
Re: JESD204B's application
@Daej: That is where JESD204B helps us in overcoming the limitations possesed like CMOS or LVDS, such as synchronization across multiple channels or board design complexity.

50%
50%
DaeJ
DaeJ
9/11/2013 9:26:14 PM
User Rank
Master
Re: JESD204B's application
Any application requiring any high speed data transfer such as wireless communication in the automotive industry might require JESD204B. But, when module is integrated to other modules such as EMS and BCM, data transfer rate might be mismatched in the gateway between subsystem. Integration implementation should be carefully reviewed in the vehicle architecture.

50%
50%
samicksha
samicksha
9/11/2013 5:14:15 AM
User Rank
Student
Re: JESD204B's application
I guess this help addressing cost constraints of a range of high speed ADC applications such as LTE.

50%
50%
eafpres1
eafpres1
9/11/2013 12:32:33 AM
User Rank
Blogger
Re: JESD204B's application
I'm wondering a similar question to DaeJ: I have noted that LVDS is used in automotive (which typically is slow to adopt technologies).  Do you think automtove applications will pursue JESD204B devices?

50%
50%
DaeJ
DaeJ
9/10/2013 7:17:37 PM
User Rank
Master
JESD204B's application
I am wondering what type application need to use this type protocol in detail. It might require more than 10GHz frequency band. For example, Video based system might require the fast data transmission to avoid the picture resolution distortion.

50%
50%
More Blogs from Jonathan Harris
Previously in this blog series we looked at using a DC/DC converter (switching regulator) in combination with an LDO to drive the power supply inputs to an ADC. What we found was that using the DC/DC converter to step down the input voltage for the LDO was a much more efficient way to drive the power supply inputs to an ADC.
We look at using a DC/DC converter along with an LDO to drive the ADC power supply inputs.
I thought it would be good to continue looking at the example I gave in my last blog where we looked using fewer LDOs and combining power supply rails on an ADC while maintaining isolation with ferrite beads.
There are some disadvantages when driving low input supply voltages, where multiple LDOs may be required.
Keeping the power supply inputs on separate domains can minimize crosstalk and make it much harder for noise to interfere with ADC performance.
flash poll
educational resources
 
follow Planet Analog on Twitter
Planet Analog Twitter Feed
like us on facebook
our partners
Planet Analog
About Us     Contact Us     Help     Register     Twitter     Facebook     RSS