bonzer
Guest
Fri Feb 12, 2010 3:03 pm
Hi,
I am building a small computer with a 4-bit 16 colour video output
that will go into a monitor that has 1500 ohm impedance.
Please could someone tell me what resistor values I need to use to
convert the 4-bit digital o/p to the required analogue signal in the
R2R ladder?
Also, if you could explain how you work it out, that would be great!!
Many thanks,
Matthew
Dave M
Guest
Fri Feb 12, 2010 3:29 pm
bonzer wrote:
Quote:
Hi,
I am building a small computer with a 4-bit 16 colour video output
that will go into a monitor that has 1500 ohm impedance.
Please could someone tell me what resistor values I need to use to
convert the 4-bit digital o/p to the required analogue signal in the
R2R ladder?
Also, if you could explain how you work it out, that would be great!!
Many thanks,
Matthew
You can use Google to find some very good texts on R2R ladder theory and
design. Search for
R2R ladder design
The first hit describes the procedure.
http://www.eng.utah.edu/~bowen/DAC_Proj/8-bit_r2rdac_current_sources.html
--
David
dgminala at mediacombb dot net
