1300 Henley Court
Pullman, WA 99163
509.334.6306
www.digilentinc.com
PmodDA2™ Reference Manual
Revised May 24, 2016
This manual applies to the PmodDA2 rev. B
DOC#: 502-113
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 1 of 2
Overview
The PmodDA2 is a 12-bit Digital-to-Analog converter powered by the Texas Instruments DAC121S101. As it is able
to simultaneously convert two separate channels of digital information provided over an interface similar to SPI,
users can easily compare the two reconstructed signals.
1 Functional Description
The PmodDA2 provides two channels of 12-bit Digital-to-Analog conversion, allowing users to achieve a resolution
up to about 1mV.
2 Interfacing with the Pmod
The PmodDA2 communicates with the host board via an SPI-like protocol. By bringing the Chip Select line to a low
voltage state, users may send a series of 16 clock pulses on the Serial Clock line (SCLK). The data is sent out with
the most significant bit (MSB) first on the last 12 clock pulses. An example data stream of how the data might look
is provided from the TI datasheet below:
The PmodDA2.
Features include:
PmodDA2™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 2 of 2
Figure 1. PmodDA2 data stream.
Pin
Signal
Description
1
~SYNC
Chip Select
2
DINA
Data In for Channel A
3
DINB
Data In for Channel B
4
SCLK
Serial Clock
5
GND
Power Supply Ground
6
VCC
Power Supply (3.3V/5V)
Any external power applied to the PmodDA2 must be within 2.7V and 5.5V; however, it is recommended that
Pmod is operated at 3.3V.
3 Physical Dimensions
The pins on the pin header are spaced 100 mil apart. The PCB is 1 inch long on the sides parallel to the pins on the
pin header and 0.8 inches long on the sides perpendicular to the pin header.
Table 1. PmodDA2 pinout table.
Figure 2. PmodDA2 circuit diagram.