[time-nuts] Experience with THS788 from TI?

Bob Camp lists at rtty.us
Wed Mar 21 16:37:22 UTC 2012


Hi

Are you after 12 ns or 12 ps? 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Ben Gamari
Sent: Wednesday, March 21, 2012 12:18 PM
To: David; Discussion of precise time and frequency measurement
Subject: [time-nuts] Experience with THS788 from TI?


On Wed, 21 Mar 2012 09:44:14 -0500, David <davidwhess at gmail.com> wrote:
> I am surprised it is not more accurate and precise.  Even old discrete
> designs can get down to 10ps or better.  I wonder what market it is
> for where space is at that much of a premium.
> 
Out of curiosity, would you happen to have an example of discrete TDC
design? Recently I've been exploring the TDC design space as these
devices are a critical part of our experiments (I do spectroscopy of
biological molecules). I'm currently (slowly) working on a FPGA TDC
design (based on the PandaDAQ[1] and CERN's Spartan 6 TDC design) but it
seems it will be non-trivial to get down to the 12 ns the commercial
offerings provide (although at great cost). What would a discrete TDC
design look like?  Are there any designs in the open?

Cheers,

- Ben

[1] http://www.keteu.org/~haunma/proj/pandadaq/
[2] http://www.ohwr.org/projects/tdc-core/wiki

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