ETC PMODR2R

®
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.
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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
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