I wonder what is the minimal latency of a digital-to-analog converter (DAC). What is the minimal clock cycle the DAC takes between the arrival of the digital signal to the output of analog signal?
6
-
\$\begingroup\$ It depends on how rich you are. I am a poor hobbyist. My favourite DAC/ADC module is this: aliexpress.com/w/wholesale-pcf8591.html \$\endgroup\$– tlfong01Jul 30 at 3:51
-
\$\begingroup\$ And conversion rate is about 10kHz: PCF8591 8-bit A/D and D/A converter (I2C, Conversio frequncy ~= 11kHz) - NXP 2013 nxp.com/docs/en/data-sheet/PCF8591.pdf \$\endgroup\$– tlfong01Jul 30 at 3:57
-
1\$\begingroup\$ It doesn't have to take any clock cycles at all. If you make the DAC out of a chain of resistors, how could it? \$\endgroup\$– user_1818839Jul 30 at 10:57
-
\$\begingroup\$ After the arrival of DAC data, you have a settling time of 90us for the PCF8591. Latency is generally used in systems that "delays" data samples while converting. Latency can also be defined with N samples ... that is to say that the results of the actual conversions will be "delayed" by N samples (example N =1). \$\endgroup\$– Antonio51Jul 30 at 12:03
-
\$\begingroup\$ @tlfong01, if budget is unlimited? \$\endgroup\$– RickyimJul 31 at 11:52
|
Show 1 more comment
1 Answer
\$\begingroup\$
\$\endgroup\$
I used an AD9742 12-bit DAC in a recent project. No doubt far from the fastest, but fast enough to synthesize some clean low MHz signals when fed fast digital data.
Settling time is ~11ns. Something like $12 in 100's, so not crazy expensive.
When you develop your specific requirements you can do parametric searches at the suppliers such as analog.com, ti.com etc. and distributors and narrow down your search.
answered Jul 30 at 4:13