[time-nuts] ACAM GP22 Chip

Thomas Allgeier th.allgeier at gmail.com
Wed Nov 25 09:21:23 EST 2015

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,
----- Original Message ----- 
From: "Robert LaJeunesse" <lajeunesse at mail.com>
To: <time-nuts at febo.com>
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" <th.allgeier at gmail.com>
>> To: time-nuts at febo.com
>> 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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