[time-nuts] Help understanding an ADEV
bob at evoria.net
Sat Sep 13 17:36:25 EDT 2014
It's an odd situation. From the datasheet:
"Note: The DAC module is designed specifically for audio applications and is not recommended for control type applications."
I had hoped that it wouldn't be a problem for driving an OCXO, but my mistake. The datasheet also notes that the DAC has 16-bit resolution but only 14-bit accuracy. It didn't seem to have even that at DC. The PWM version doesn't have any escape clauses. You set "x" parameters and it's supposed to be 16-bits wide. Maybe "audio" means within the human auditory passband?
From: Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk>
To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Saturday, September 13, 2014 4:27 PM
Subject: Re: [time-nuts] Help understanding an ADEV
On 11 Sep 2014 04:35, "Bob Stewart" <bob at evoria.net> wrote:
> I've ordered the PWM version of the PIC, and hopefully, since it's the motor control version (as opposed to the audio version) it will have much better noise performance.
I don't know the PIC but I would have thought chips for audio would be optimised for low noise far less than one for driving motors.
Dr David Kirkby
Kirkby Microwave Ltd
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