74HC4046 Model Development

[Jim Thompson]

I have posted a first-pass attempt at a 74HC4046 model at...

http://www.analog-innovations.com/SED/HC4046_SUB.zip

This is just the VCO portion for now, and just the variable part;
suitable only for LTspice.

Please try it out and let me know your comments, etc.

Since I'm new to working with LTspice, please send me any error
messages, so I can refine my skills >:-}

-Jim Thompson

...Jim Thompson
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I love to cook with wine. Sometimes I even put it in the food.

 

[Mike Perkins]

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

 

[Jasen Betts]

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?

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