doc: 502-165 page 1 of 1 copyright digilent, inc. all rights reserved. other product and company names mentioned may be tradema rks of their respective owners. p p m m o o d d r r 2 2 r r ? ? r r e e f f e e r r e e n n c c e e m m a a n n u u a a l l ? ww w. d ig i l en t inc .c om revision: february 6, 2009 note: this document applies to rev b of the board. 215 e main suite d | pullman, wa 99163 (509) 334 6306 voice and fax overview the PMODR2R board provides digital-to-analog conversion using a circuit that has been a staple in engineering design for decades. the board provides an easy way to gain insight and experience with r2r circuits. features include: ? 8-bit digital to analog conversion at up to 25mhz ? easy attachment of oscilloscopes to illustrate the data conversion process ? rugged construction functional description the PMODR2R board provides an r2r resistor divider network that can convert an 8-bit digital input signal to an analog value. the board uses 20k and 10k resistors, so very little current is drawn from input source pins. separate gnd and analog signal-out connections are provided. the output analog signal is also connected to a 2-pin header at j1. j3 provides a 2-pin test point for easy measurement of analog signals. 20k 20k 20k 20k 20k 20k 20k 20k 10k 10k 10k 10k 10k 10k 10k 20k d7 d6 d5 d4 d3 d2 d1 d0 gnd output p10 p3 p4 p7 p9 p8 p2 p1 j2 pin signal signals and connector pinouts
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