® PmodR2R™ Reference Manual 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. J2 Pin Signal 20K P10 D7 P9 20K 20K 10K 20K 10K D6 P8 D5 P7 D4 20K P4 P3 P2 10K D3 20K 10K 20K 10K D2 D1 20K P1 Output 10K 10K D0 20K GND Signals and Connector Pinouts Doc: 502-165 page 1 of 1 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.