I mentioned the need to be careful with grounding in mixed-signal
circuits. This Analog Devices tutorial is a useful introduction to
the subject, for those interested:
Grounding Data Converters and Solving the Mystery of AGND and DGND
On Sat, Mar 15, 2014 at 9:21 PM, d0ct0r t...@patoka.org wrote:
Many thanks indeed for detailed answer ! Yes, I will using Evaluation
Board for my project.
Then it is already done for you. They have added all the bypass caps
already on the board. Not much left for you to do. In fact you
-boun...@febo.com] På vegne
af d0ct0r
Sendt: 16. marts 2014 05:22
Til: time-nuts@febo.com
Emne: Re: [time-nuts] Power Supply for AD9852 / AD9854
Many thanks indeed for detailed answer ! Yes, I will using Evaluation Board
for my project.
Regards,
V.P.
On 2014-03-16 00:06, Charles Steinmetz wrote
-nuts@febo.com
Subject: Re: [time-nuts] Power Supply for AD9852 / AD9854
On Sat, Mar 15, 2014 at 9:21 PM, d0ct0r t...@patoka.org wrote:
Many thanks indeed for detailed answer ! Yes, I will using Evaluation
Board for my project.
Then it is already done for you. They have added all
On 3/16/14 8:13 AM, d0ct0r wrote:
Thanks ! Looks like I am on the right track.
I've attached couple of documents which could be useful. I'am going to
use two separated voltage regulators for VCC/AVDD and DVDD. And use 10
Ohm / 100Mhz ferrite board and few capacitors to separate VCC and AVDD.
Sorry, I forgot to add the link:
http://www.wenzel.com/documents/finesse.html
Thomas Knox
From: act...@hotmail.com
To: time-nuts@febo.com
Date: Sun, 16 Mar 2014 09:46:04 -0600
Subject: Re: [time-nuts] Power Supply for AD9852 / AD9854
I do not know if this is of interest or would
I would assume that using two voltage regulators will spread the load.
For the AD9851 I'am planning to put external radiator glued on top of
it.
Regards,
V.P.
those parts dissipate a fair amount of heat, and they're not very big.
If you turn on everything in the 9854 AND run it at 300
I would assume that using two voltage regulators will spread the load.
For the AD9851 I'am planning to put external radiator glued on top of
it.
One of my commercial projects used eight x AD9852. During development
they definitely needed small heat sinks glued on top of each chip.
I
My versions of a DDS using two AD9910 in Quadrature
http://members.wideband.net.au/gzimmer/QuadDDS/default.html
regards ... Zm
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On 3/16/14 9:34 AM, d0ct0r wrote:
I would assume that using two voltage regulators will spread the load.
For the AD9851 I'am planning to put external radiator glued on top of it.
It's not the power dissipation of the regulators that's the concern,
it's the dissipation of the 9854. A
Hi
If you use multiple regulators for the same supply and they don’t come up at
the same time, odd things can happen. On some chips those odd things include
smoke. In most cases where it fails, the more common effect is the internal
reset does not work properly and you can’t talk to the chip.
Unless it’s already on a board, this is not a simple chip to use in a home
environment.
Nevertheless, some of us do manage.
But it's true, the AD9852/AD9854 does run very hot.
It's worth mentioning that the AD9910/AD9912 family runs much cooler.
Mine aren't even warm to the touch. This of
You have not said any thing as to what you expect to get out of the DDS
and how important certain parameters are. We recently did a AD 9913 that Tom
tested extensively http://www.leapsecond.com/pages/ad9913/ using a single
supply for the DDS. Some may take exception but it works for us. The
Correction I did put pin 4 on the same regulator as the PIC. Had to have
one for the PIC so why not use it. Do not know if it made a difference.
Bert
In a message dated 3/16/2014 3:58:20 P.M. Eastern Daylight Time,
ewkeh...@aol.com writes:
You have not said any thing as to what you
Hello,
By design, DDS stones like AD9852 from Analog Devices, required
separated power lines for AVDD, DVDD and VCC.
What will is simple solution for that ? I am planing to use following
approach: +5V from linear PS, then three LC filters, then three 3.3V
voltage regulators (Ex.: MC33269T)
I think most people use just one regular and then use bypass caps that are
physically close to the power pins. Being really close is likely the most
important point.
What matters as much or even more is the design of the ground system. The
Vcc pins are actually easier to take care of, I think,
By design, DDS stones like AD9852 from Analog Devices, required
separated power lines for AVDD, DVDD and VCC. What will is simple
solution for that ? I am planing to use following approach: +5V
from linear PS, then three LC filters, then three 3.3V voltage
regulators (Ex.: MC33269T)
Many thanks indeed for detailed answer ! Yes, I will using Evaluation
Board for my project.
Regards,
V.P.
On 2014-03-16 00:06, Charles Steinmetz wrote:
By design, DDS stones like AD9852 from Analog Devices, required
separated power lines for AVDD, DVDD and VCC. What will is simple
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