In message f356n894epicao60crhh56g7itkofer...@4ax.com, David writes:
The DAC1220 span and offset drift versus temperature on the other hand
are 20 to 50 times worse than that of the AD5791 unless you want to
spend the $30 difference in price for deglitching so you can use the
AD5791
On Sun, 21 Apr 2013 06:41:06 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
In message f356n894epicao60crhh56g7itkofer...@4ax.com, David writes:
The DAC1220 span and offset drift versus temperature on the other hand
are 20 to 50 times worse than that of the AD5791 unless you want to
spend
In message lf47n81l7t8su75pimf6it1pfm74n3p...@4ax.com, David writes:
On Sun, 21 Apr 2013 06:41:06 +, Poul-Henning Kamp
Uhm, you lost me there, autocalibration feature ?
Sorry, I meant the DAC1220 manual self-calibration feature which
corrects for gain and offset errors.
ahh.
But those are
On Sun, 21 Apr 2013 09:20:28 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
In message lf47n81l7t8su75pimf6it1pfm74n3p...@4ax.com, David writes:
On Sun, 21 Apr 2013 06:41:06 +, Poul-Henning Kamp
Uhm, you lost me there, autocalibration feature ?
Sorry, I meant the DAC1220 manual
In message u6k7n815ugngmc185k08m7578v1kq8d...@4ax.com, David writes:
On Sun, 21 Apr 2013 09:20:28 +, Poul-Henning Kamp
How long is the PLL time constant compared to the rate of temperature
changes? Maybe I misunderstood the application.
I'm working on driving the EFC input of a double-oven
What drives the EFC?
Bert Kehren
In a message dated 4/21/2013 7:59:23 A.M. Eastern Daylight Time,
p...@phk.freebsd.dk writes:
In message u6k7n815ugngmc185k08m7578v1kq8d...@4ax.com, David writes:
On Sun, 21 Apr 2013 09:20:28 +, Poul-Henning Kamp
How long is the PLL time constant
In message 7601e.32c7850c.3ea53...@aol.com, ewkeh...@aol.com writes:
What drives the EFC?
A computer implemented PLL controls the DAC which drives the EFC
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since
the DAC1220 is definitely worth a second look. Two wire opto coupling makes
it even better. On my next PCB run there will be a test circuit. Thank you
for the hint.
Bert Kehren
In a message dated 4/19/2013 9:44:32 A.M. Eastern Daylight Time,
herb...@13thfloor.at writes:
On Fri, Apr 19,
Looked up the DAC1220 and thats a very nice chip for ~$8.
Amazing 20 bit resolution and easy to hook up.
Regards
Paul
WB8TSL
On Sat, Apr 20, 2013 at 6:00 AM, ewkeh...@aol.com wrote:
the DAC1220 is definitely worth a second look. Two wire opto coupling makes
it even better. On my next PCB run
where did you find it for $ 8?
Bert
In a message dated 4/20/2013 3:48:08 P.M. Eastern Daylight Time,
paulsw...@gmail.com writes:
Looked up the DAC1220 and thats a very nice chip for ~$8.
Amazing 20 bit resolution and easy to hook up.
Regards
Paul
WB8TSL
On Sat, Apr 20, 2013 at 6:00
I looked at the DAC1220 first, but in an EFC application it worries
me to no end that it is a Sigma-Delta DAC.
Even if I feed it a clock divided down from the OCXO you're EFC'ing,
to avoid beatfrequency effects, I would still worry about harmonic
effects and noise.
Also, the noise-spec is
On Sat, 20 Apr 2013 20:14:06 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
I looked at the DAC1220 first, but in an EFC application it worries
me to no end that it is a Sigma-Delta DAC.
Even if I feed it a clock divided down from the OCXO you're EFC'ing,
to avoid beatfrequency effects, I
On Sat, Apr 20, 2013 at 08:14:06PM +, Poul-Henning Kamp wrote:
I looked at the DAC1220 first, but in an EFC application it
worries me to no end that it is a Sigma-Delta DAC.
Even if I feed it a clock divided down from the OCXO you're
EFC'ing, to avoid beatfrequency effects, I would still
Bert
I was looking at your price in the leading email. You had ~$8. So thats
what I thought it was.
I may have misread it sorry.
Regards
Paul
WB8TSL
On Sat, Apr 20, 2013 at 7:59 PM, Herbert Poetzl herb...@13thfloor.atwrote:
On Sat, Apr 20, 2013 at 08:14:06PM +, Poul-Henning Kamp wrote:
Has anybody tried using the AD5791 20bit DAC for EFC control ?
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
As one of our digital loop projects we took a very, very close look at it,
but thought once you consider the application, requirements of external
references, its influence on temperature performance and cost, a dithered 20
bit LTC 1655 held at 0.1 C is as good a solution. Have not actually
On Fri, Apr 19, 2013 at 09:20:05AM -0400, ewkeh...@aol.com wrote:
As one of our digital loop projects we took a very, very close
look at it, but thought once you consider the application,
requirements of external references, its influence on
temperature performance and cost, a
In message 20130419134411.gb29...@mail.13thfloor.at, Herbert Poetzl writes:
On Fri, Apr 19, 2013 at 09:20:05AM -0400, ewkeh...@aol.com wrote:
Texas Instruments has a number of precision DACs for a
very reasonable price, for example the DAC1220 (20bit
low power delta-sigma, ~8 USD) and precision
Thats a great question and not to distract the thread. The modern
references seem far superior to the old ones that might be as simple as a
zener diode. However the internal references are almost always in a semi
temperature controlled environment near the oven.
Kind of interesting trade offs.
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