Will a user have to own a specific DMM to perform this procedure - I'm thinking of this potential board product + the Lite for DAM owners?
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Please discuss the topic, not each other. OT posts removed.After covid, we should have that listening session... in Belgium, or we come to France if you prefer. I'm really curious...
Edit: oops, sorry for the kind of off topic...
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Yes, I will write the Windows application to interface my DMM via GPIB.
So if one would the DAM calibrated should send me the board for calibration.
At the beginning we thought to build a custom DMM using a precise ADC but the project is complex and the cost is high, and we haven't enough free time to design the instrument, so we moved to a commercial DMM.
Indeed in our DAC Lite we are planning to use higher tolerance resistors but with low thermal drift (10 ppm or lower).
The DAM is not one of our projects so we cannot replace the resistors.
Or we will ask to Gentlevoice member to organise us a dac meeting in North Italy to met all each others and benchmark our ... tweaks and more (or less) clever designs 🙂 ... I'm not sure to have better speakers than Dany's !
OK! So you will use e.g. 0,1% resistors but with very good temp co and calibrate. Interesting approach. Nice to offer DAM calibration!
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Yes, in the DAC Lite we will use 0.1% resistors with 10 ppm temp co. or better.
The measurements and the correction algorithm implemented in the FIFO Lite allow a calibration to real 24 bit.
The same with the DAM1021, except for the thermal drift of the resistors used, I don't know what kind of resistors have been used.
The measurements and the correction algorithm implemented in the FIFO Lite allow a calibration to real 24 bit.
The same with the DAM1021, except for the thermal drift of the resistors used, I don't know what kind of resistors have been used.
Well if one cases the DAC in and adequate way - I see you use wool 🙂 the temp drift would be equal over the resistors at least - maybe it zeroes out?
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The top version of the DAC will keep long time development.
Substantially it's not only the DAC but the whole system including the front end (the top version of the FIFO).
The architecture is the same of the FIFO and DAC Lite, but with improved solutions in all the aspects.
For example we will use optic fiber cables to connect the dirty signals from the FIFO to the DAC, we will use different dividers for the LRCK, we will use different sine to square converters, the first 5 MSB of the DAC are thermometer decoded (instead of the first 3 MSB of the DAC Lite), and so on.
Maybe the main difference is that the FIFO Lite is a open system compliant with almost all DACs while the Top version is a closed system, the Top end of the FIFO works with the Top end DAC only, no way to use it with other DACs.
Ok, then no way.
In the FIFO Lite the latency is configurable setting the portion of the SRAM to be used, from 8Mbit (max) to 100Kbit (min), but the minimal latency will be at least 30-40 ms.
It could be useful if the designer told us what kind of resistors have been used in the DAM so we could take a look at the datasheet to know the thermal drift.
BTW, you can use wool for thermal stabilization of the resistors and also of the 595s, but I think a copper sheet will be better.
BTW, you can use wool for thermal stabilization of the resistors and also of the 595s, but I think a copper sheet will be better.
Cooper sheet sound scary to bring close to electronics. Is there coated versions or how do one do it?
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Yes, I have seen somewhere copper sheet with isolating biadhesive but I don't remember exactly where, try a Google search.
The copper sheet would be better because of its larger thermic mass.
The copper sheet would be better because of its larger thermic mass.