On 10/22/2012 03:08 PM, Mike Perkins wrote:> On 22/10/2012 16:42, Jim Thompson wrote: >> >> Quite frankly I don't give a rat's ass whether you use the model or >> not. I find the 74HC4046 a piece-a-crap, a rather poor CMOS copy of >> my original design, the quite linear MC4024 of nearly 50 years ago. >> >> ...Jim Thompson >> > > I have found that the variation of parameters the 74HC4046 from one > manufacturer to another is such that I cannot agree with such a sweeping > statement. I found the Philips/NXP variant a very well behaved device, > whereas others had/have poor VCO control linearity etc. >If you read the datasheet carefully, that good performance only exists over a certain range of parameters, and is only typical, not guaranteed. See the list of datasheet references I posted in the other HC4046 thread a few days ago. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
74HC4046 Model Development
Started by ●October 20, 2012
Reply by ●October 22, 20122012-10-22
Reply by ●October 22, 20122012-10-22
On 22/10/2012 21:38, Phil Hobbs wrote:> On 10/22/2012 03:08 PM, Mike Perkins wrote: > > On 22/10/2012 16:42, Jim Thompson wrote: > >> > >> Quite frankly I don't give a rat's ass whether you use the model or > >> not. I find the 74HC4046 a piece-a-crap, a rather poor CMOS copy of > >> my original design, the quite linear MC4024 of nearly 50 years ago. > >> > >> ...Jim Thompson > >> > > > > I have found that the variation of parameters the 74HC4046 from one > > manufacturer to another is such that I cannot agree with such a sweeping > > statement. I found the Philips/NXP variant a very well behaved device, > > whereas others had/have poor VCO control linearity etc. > > > If you read the datasheet carefully, that good performance only exists > over a certain range of parameters, and is only typical, not guaranteed. > See the list of datasheet references I posted in the other HC4046 > thread a few days ago. >Whilst I agree that each manufacturer gives a range for each parameter, my experience is that each manufacturer produced devices which were amazingly consistent, but wildly changing from one manufacturer to another. I recall that each manufacturer specified their 74HC4046 very differently to show theirs in the best light. One problem I had years ago was that one version produced over 25MHz irrespective of R and C with a control voltage at +5V, causing my counters to fail and the whole PLL to fall over! -- Mike Perkins Video Solutions Ltd www.videosolutions.ltd.uk
Reply by ●October 23, 20122012-10-23
On 2012-10-22, amdx <amdx@knology.net> wrote:> Someone needs to make a living... and pay the taxes for the 47% that > don't! Or someone needs to work to pay the taxes required to fill the > welfare kitty with that 1.032 trillion dollars every year. > The government says we have 46 million people in poverty in 2012. > If you divide 1.032 trillion by 46 million that is $22,434 per person. > Minimum wage is about $15,000. Hmm...perhaps minimum wage isn't enough to live on? -- ⚂⚃ 100% natural --- news://freenews.netfront.net/ - complaints: news@netfront.net ---
Reply by ●October 23, 20122012-10-23
amdx <amdx@knology.net> wrote:>On 10/22/2012 9:04 AM, Phil Hobbs wrote: >> On 10/22/2012 07:26 AM, G�nter Haarmann wrote: >>> Am 22.10.2012 01:28, schrieb Jim Thompson: >>> >>>> >>>> I really do hope someone will try out the model and let me know how it >>>> simulates... rather than blathering that it's encrypted. >>>> >>>> ...Jim Thompson >>>> >>> >>> No. if you don�t want to give you won�t receive. >>> >>> You want to earn money with it, then spend some money for testers. >> >> I dunno. Making the model will probably help some folks, if they don't >> expect its horrible nonlinearity to be horrible in quite the same way as >> the production parts. (For a variety of reasons, I'm also in favor of >> people being able to make a living.) >> >> Cheers >> >> Phil Hobbs >> > Someone needs to make a living... and pay the taxes for the 47% that >don't! Or someone needs to work to pay the taxes required to fill the >welfare kitty with that 1.032 trillion dollars every year. > The government says we have 46 million people in poverty in 2012. >If you divide 1.032 trillion by 46 million that is $22,434 per person. >Minimum wage is about $15,000. Hmm...Which means a lot of people are being employed AND make good money to help the unemployed :-) -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
