I would assume it is only a question of resistor values. Perhaps thermal considerations prevent the use of low value resistors/high current in integrated chips. Just speculating.
No, it depends on how you use the R2R network, forward or backwards, i.e. which pins you use as input or resp. output. Depending on that you have the output as voltage or current, see e.g.
https://www.analog.com/media/en/training-seminars/tutorials/MT-015.pdf
Well, according to the tutorial zfe linked, an R2R implementation has a very stable output impedance and the chosen implementation in the DAMs is a pure voltage source. No need for I/V. The ‘old R2R chips’ that needed I/V must have been current sources. Just speculating 😀
hi everybody again,
please could someone tell me (newbie), if i would be satisfied with a (used) rev.2 board for building my first dac, or if i should better buy the newest version rev5. thanks in advance.
please could someone tell me (newbie), if i would be satisfied with a (used) rev.2 board for building my first dac, or if i should better buy the newest version rev5. thanks in advance.
Why are you asking as you seem to be decided, already?
Guess it fully depends on you.
BTW:
Soekris dam1021 Sign Magnitude R-2R DAC | Dimdim's Blog:
Update (Nov 2015): Soekris has released a Rev 2 of the board, with improved Vref power supplies and a better muting circuit. It is available in just two resistor grades, a 0.01%/0.02% mix and 0.05%.
Update (Feb 2016): Soekris has released a Rev 3 of the board, with further improved Vref power supplies (more capacitance). It is available only with 0.02% resistors.
Update (Feb 2016): Soekris has released a Rev 3 of the board, with further improved Vref power supplies (more capacitance). It is available only with 0.02% resistors.
I would have bought the 1941(21) and run it over USB. Maybe with an optical isolated USB.
This is probably the best sounding option today. Myself, I own one 1021 and two 1121.
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This is probably the best sounding option today. Myself, I own one 1021 and two 1121.
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yet another Q
Sorry, this has been asked a thousand times already, I'm sure...
before I ask the obvious one question—is there sort of a FAQ / assembly-guide for newbies?
because, as a newbie, I'd like to see (or read, if pictures aren't available) wether I'd be able to assemble one, what parts are required, if it could be integrated in a pre, etc...
I'm kinda scared of those multi-thousand-posts-threads, sorry!
david
Sorry, this has been asked a thousand times already, I'm sure...
before I ask the obvious one question—is there sort of a FAQ / assembly-guide for newbies?
because, as a newbie, I'd like to see (or read, if pictures aren't available) wether I'd be able to assemble one, what parts are required, if it could be integrated in a pre, etc...
I'm kinda scared of those multi-thousand-posts-threads, sorry!
david
1941 = 4 banks of R2R, running in differential mode
1921 = 2 banks of R2R, running in single ended mode
