Thanks Jim,
The Abercon AP3S was what I had used in the past but I had to dig deep
to find a reference to that family there on the web page.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
-------- Forwarded Message --------
Subject: [time-nuts] Re: Preprogrammed fixed-frequency relatively lower
noise oscillator chip
Date: Sat, 4 Dec 2021 12:05:07 -0800
From: Lux, Jim <[email protected]>
Reply-To: Discussion of precise time and frequency measurement
<[email protected]>
To: [email protected]
On 12/4/21 10:31 AM, Jeff Blaine wrote:
I'm wondering what the modern version of a fixed-frequency oscillator
module is.
I had used the Silicon Labs (now Skyworks) Si570 in the past which has
a great close-in noise footprint - but that requires I2C and some
glue. The Seiko distributor-programmable type of generic parts are
functionally ideal - comes preprogrammed and requires minimal
connections to function - but they have miserable close in noise
characteristics. I realize that "miserable" here is subjective of course.
The project at hand is a single frequency oscillator to serve as a LO
in a receiver. The noise profile I'm looking for would be in the
range of "better than the generic PLL type $5 oscillators" and "not as
good as the modern equivalent to the Si570 & similar." Absolutely
non-critical but the Seiko part in there now looks terrible starting
to flatten out at -40 dBc a Khz or so spaced.
This answer seemed (from my recollection) easy to find back in the
early 2010s when I had messed with it last. Then Abercon had some
decent offerings - but that is a long time ago in Electronics Progress
Time scale.
Probably you're thinking Abracon -they're still in business - and all
sorts of oscillators, including MEMS.
I don't know if they make a programmable one (even "program at
factory/distributor")
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