An update: Got another set of ABM8G. Those worked directly with the Piccolo DSP controller. I guess that was a batch of bad crystals, what I got previously. Will update this thread, as more light is shed into it. Cheers, Manu On Sat, Sep 22, 2018 at 1:47 AM Bob Blick wrote: > > Hi Manu, > > I have long suspected that the reasons certain types of crystals and reso= nators don't work in every application are the amount of phase shift or els= e the impedance, so it all ends up being too lossy to oscillate. But if you= add more capacitance to push the phase, then you need more gain, which you= may not have had enough to begin with. > > By using multiple gates in series, you get both more gain and more phase = shift, and it may work perfectly. > > Cheerful regards, Bob > > ________________________________________ > From: piclist-bounces@mit.edu on behalf of Manu= Abraham > Sent: Friday, September 21, 2018 10:42 AM > To: Microcontroller discussion list - Public. > Subject: Re: [EE] testing a crystal > > Hi Bob, > > Thanks for the quick reply. I was wondering something like that, > but could not really get a foot on the topic where to start looking. > > Why would it need more gates ? Larger delay ? > > Additionally, I tried another 12MHz crystal with the 4060, that does appe= ar > to work. NX5032GA-12MHZ-STD-CSK-4 > > http://www.ndk.com/images/products/catalog/c_NX5032GA_e.pdf > > But unfortunately, I cannot replace the ABM8G with the NX5032, since it h= as > a different footprint. Feel really frustrated. :-/ > > That said, using a Piccolo http://www.ti.com/lit/ds/symlink/tms320f28069m= ..pdf > > I cannot really add any gates in there as it has a built in oscillator. > Have been trying to debug why the oscillator block wont become alive. :-) > > This was the whole scenario, that I've trying to debug with the 4060. > > Scratching my head still. > > Thanks, > > Manu > > > > On Fri, Sep 21, 2018 at 10:53 PM, Bob Blick wrote: > > Hi Manu, > > > > I did a survey of resonators a few years back, and basically there are = some resonator types that require more oscillator gain to operate. > > > > If you need it to work with your 4060 you might need to make a separate= oscillator using multiple gate sections in series. > > > > Cheerful regards, > > > > Bob > > > > P.S. fixed tag. You need a beginning square bracket. > > ________________________________________ > > From: piclist-bounces@mit.edu on behalf of Ma= nu Abraham > > Sent: Friday, September 21, 2018 9:55 AM > > To: Microcontroller discussion list - Public. > > Subject: EE testing a crystal > > > > Hi, > > > > I have the following crystal, with a frequency of 12MHz. > > > > https://abracon.com/Resonators/ABM8G.pdf > > > > Soldered one of these onto the desired PCB, thought of testing the > > crystal using a HEF4060B by connecting between pins 9 and 10, the > > crude test which has worked over the years. > > > > Sadly there were no oscillations at all. > > > > The next thought was to do a dead bug style, the crystal. Did that > > too, but there seems to be no life at all. > > > > As a result, thinking that the crystal could be dead, tried a brand > > new exactly same ABM8G crystal in the dead bug style, which also > > showed no signs of life. > > > > Tried a 7.3728MHx crystal in it's position, that does show a clean > > 7.3728MHz oscillation > > > > > > I am just scratching my head, lost in thoughts. > > > > Any suggestions, anyone ? > > > > Thanks, > > > > Manu > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .