Hello Bob,
Thanks for the suggestions - these sound a bit beyond my current level of
skills and kit. But I do have people to call on in the office who may be
able to rig something like that up for me should the coax route fail.
Best regards,
Thomas.
----- Original Message -----
From: "Robert LaJeunesse" <[email protected]>
To: <[email protected]>
Sent: Tuesday, November 24, 2015 6:25 PM
Subject: Re: [time-nuts] ACAM GP22 Chip
If the goal is to create two signals consistently spaced near 70us apart
why not use a good, fast 8-bit serial-in, parallel out shift register,
clocked cleanly at 100kHz? Using the outputs from stages 1 and 8 would
result in a 70us delay between signals. The data in would be fed 100KHz
divided by 10 (or 16, or anything greater than 8) at whatever duty cycle
is available. This allows the GP22 to see the combined instabilities of
the clock and the shift register, which could be down in the nanosecond
range, possibly less since the shift register delays would inherently
cancel all but their differences.
Bob LaJeunesse
Sent: Tuesday, November 24, 2015 at 9:04 AM
From: "Thomas Allgeier" <[email protected]>
To: [email protected]
Subject: [time-nuts] ACAM GP22 Chip
Hello,
I have an ACAM GP22 TDC chip and evaluation board which I am looking at
for “work” purposes – I work for a company active in the weighing and
force measurement world.
...
We want to use this chip to measure the period of a square wave, of
around 13 kHz i.e. in the 70 µs range. As the application is potentially
high-accuracy we need to know the period to within 1 ns or better.
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