Are schematics available?
Ralph
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Hi All, I interested in discussion about 4046, in lars GPSDO he use 4046 as
phase comparator must I replace this Chip for CD74HCT4046A btw I also have many
TC5081 I wonder how to test the circuit use this chip if have same problem with
4046.Thank YouAnton
>On 4/18/2018 4:34 AM, John Miles wrote:
>> Ulrich Rohde's book indicates that this problem was first documented in 1978
>> in an EDN article by some authors named Egan and Clark. Newer PFDs
>> implement the 'antibacklash' logic that Rohde mentions. If you really must
>> use a 4046, I'd look
On 4/18/2018 3:15 PM, Magnus Danielson wrote:
The real benefit of the 4044 and 4046 lies in that they where CMOS
devices and integrated well with other CMOS devices, and could help to
The original MC4044 is TTL, not CMOS. There is a CMOS "CD4044"
but it is something completely different,
Hi,
On 04/18/2018 10:57 PM, Charles Steinmetz wrote:
> Rick wrote:
>
>> The book is incorrect. A patent issued in 1976 (US4023116A)
>> covering the Fairchild 11C44 developed by Eric Breeze predates
>> the EDN article by several years. I still remember the big
>> splash the 11C44 made when it
Hi Ole Petter,
On 04/16/2018 12:12 PM, Ole Petter Ronningen wrote:
> Hi, All
>
> This will be a bit long, and I apologize for it. Perhaps someone else also
> struggle with the same.
>
> One of the properties of the familiar ADEV-plots are the slopes - and how
> the slope identify the dominant
Rick wrote:
The book is incorrect. A patent issued in 1976 (US4023116A)
covering the Fairchild 11C44 developed by Eric Breeze predates
the EDN article by several years. I still remember the big
splash the 11C44 made when it was introduced in 1976. The Fairchild
ECL data book had a famous
On 04/18/2018 03:17 PM, Charles Steinmetz wrote:
> donald wrote:
>
>> HEF4046BCN`s, but have
>> recently read that this CMOS IC has a design flaw. What would be a better
>> chip to retrofit?
>
> As Bill said, the HCT9046 is the improved version of the 4046.
>
> The "flaw" in the 4046 is a
I too would recommend the 74HCT9046A instead of the 4046.
The data sheet is here;
https://assets.nexperia.com/documents/data-sheet/74HCT9046A.pdf
*Ms. Tisha Hayes*
On Wed, Apr 18, 2018 at 8:27 AM, Bob kb8tq wrote:
> Hi
>
> If this is a new build, why use a 4046 in the first
On 4/18/2018 6:27 AM, Bob kb8tq wrote:
Hi
If this is a new build, why use a 4046 in the first place? There are many newer
parts
that will do all sorts of things. If this is a repair of something that has
been running
for years, is it > 5V supply to the chips? If so, you are pretty much
On 4/18/2018 4:34 AM, John Miles wrote:
Ulrich Rohde's book indicates that this problem was first documented in 1978 in
an EDN article by some authors named Egan and Clark. Newer PFDs implement the
'antibacklash' logic that Rohde mentions. If you really must use a 4046, I'd
look for a
Hi
If this is a new build, why use a 4046 in the first place? There are many newer
parts
that will do all sorts of things. If this is a repair of something that has
been running
for years, is it > 5V supply to the chips? If so, you are pretty much stuck
with 4000
series CMOS.
There are no
donald wrote:
HEF4046BCN`s, but have
recently read that this CMOS IC has a design flaw. What would be a better
chip to retrofit?
As Bill said, the HCT9046 is the improved version of the 4046.
The "flaw" in the 4046 is a dead zone around zero error in Phase
Comparator 2 (the PC one generally
There is no dead time issue at all with 4046 PLL's using the built-in XOR
(Type I) phase detector.
There can be a dead-time issue with 4046 PLL's using the built-in type II
(flip-flop) edge detector.
The 74HCT9046A uses current sources instead of voltage sources in its type
II (flip-flop) edge
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of
> donald collie
> Sent: Wednesday, April 18, 2018 2:40 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 4046 replacement
>
> Thankyou Attila. I remember reading
Hi Donald,
I've just had this problem - the 'signal' input (p14) to the phase detectors is
a 'bodge' linear amplifier built around standard CMOS stages and it doesn’t
work right. A resistor around a CMOS inverter was a good old recipe to get a
'linear' amplifier stage but this design appears
Thankyou Attila. I remember reading a book on PLL theory, recently,writen
by a very knowledgable fellow, but I didn`t think to make a copy of his
critique of the 4046. I recall that the nub of it was that the 4046 isn`t
suitable for some applications because of a design flaw. Perhaps somebody
in
Why not try one, the 74HC4046 is pin compatible I think, you may need to
make some changes to use the '7046 version but you can then make a value
judgement if the flaw had in fact mainfested itself as a problem in your
design?
On 18 April 2018 at 09:04, donald collie
On Wed, 18 Apr 2018 20:04:02 +1200
donald collie wrote:
> I have 4 frequency synthesiser projects, each using HEF4046BCN`s, but have
> recently read that this CMOS IC has a design flaw. What would be a better
> chip to retrofit? I`m thinking perhaps a HEF74HC4046AN
I have 4 frequency synthesiser projects, each using HEF4046BCN`s, but have
recently read that this CMOS IC has a design flaw. What would be a better
chip to retrofit? I`m thinking perhaps a HEF74HC4046AN [that`s if it
doesn`t have the same bug], or a 74HC7046AN - which is similar. Both these
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