Hi Bob, Your comment makes perfect sense. So, I suppose the equivalent series resistance is the key player that's acting in such a situation, Probably ? In the case of the ABM8G it has about 120 ohms, while the NDK NX5032GA has about 100 ohms. But that said, the datasheet spec says that the ABM8G needs a drive level of 10uW, while the NX5032 needs about 50uW. The NX5032 works while the ABM8G does not. Slightly confusing, at least the datasheets does not make any parameter look in a much contrasting way, confusing when you look at the datasheet. Instead of the 4060, let me try wiring a few gates instead and try the veroboard method of testing the crystal. Thanks, Manu On Sat, Sep 22, 2018 at 1:46 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 s= ome 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 Man= u 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 .