[time-nuts] Sub Pico Second Phase logger

Joe Gwinn joegwinn at comcast.net
Mon Dec 22 17:44:53 UTC 2008


Ulrich,

At 7:57 AM +0000 12/22/08, time-nuts-request at febo.com wrote:
>
>Message: 7
>Date: Mon, 22 Dec 2008 08:56:55 +0100
>From: "Ulrich Bangert" <df6jb at ulrich-bangert.de>
>Subject: Re: [time-nuts] Sub Pico Second Phase logger
>To: "'Discussion of precise time and frequency measurement'"
>	<time-nuts at febo.com>
>
>Joe and Bruce,
>
>>  Ulrich has built a circuit that takes a sampling frequency
>>  input derived from a 10MHz GPSDO output and produces an
>>  S/PDIF output for this application. Its certainly worth
>>  trying since all the specs for the sound card aren't readily
>>  available.
>
>I use a cheap and easy to use CRYSTAL CS8402 S/PDIF transmitter to
>generate the S/PDIF signal for the sound card. Data input just tight to
>ground. The balanced output is done with a Minicircuits T1-1T
>transformer. The chip needs an 12.844 MHz clock for 96 kHz sample rate
>and 6.144 MHz for 48 kHz sample rate. However, these two frequencies are
>generated by an old HP3330 locked to 10 MHz in my case. If the circuit
>had to be designed new I would have used a ANALOG DEVICES dds circuit
>with a built in clock multiplier.

Thanks for the pointer.  I'll look at the datasheet of the CS8406, 
which replaces the CS8402.

<http://www.cirrus.com/en/products/pro/detail/P1009.html>

Joe




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