Datasheet

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodDA3™ Reference Manual

Revised April 22, 2015

This manual applies to the PmodDA3 rev. B

DOC#: 502-241

Other product and company names mentioned may be trademarks of their respective owners.

Page 1 of 2

Overview

The PmodDA3 is a 16-bit digital-to-analog converter (DAC) with an SMA connector for high resolution and low

noise analog output.

1 Functional Description

The PmodDA3 utilizes Analog Devices AD5541A to provide analog output with 16-bit resolution.

2 Interfacing with the Pmod

The PmodDA3 communicates with the host board via a SPI-like protocol. This interface is different than the

traditional SPI protocol in the fact that the pin normally designated to the host receiving data (MISO), is now used

for a Load DAC (LDAC) function so that the output of the DAC can be updated immediately once the module is

loaded with the incoming 16 bits of data.

To send data to the Pmod, users must drive the Chip Select (CS) line to a logic level low voltage and then send the

16 clock pulses and 16 bits of data in SPI Mode 0; that is, placing the most significant bit (MSB) of data on the data

line right after the Serial Clock line (SCLK) has been brought to a logic level low voltage.

When all of the data has been latched into, i.e. prepared for, the internal serial input register, bringing the CS line

back to a logic level high voltage will transfer all of the data from the shift register to the serial input register if

The PmodDA3.

 SPI-like communication interface

 Uses the Analog Devices AD5541A

 16-bit DAC

 2.5V reference voltage

 Very low noise

Features include:

PAGE 1
300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodDA3™ Reference Manual Revised April 22, 2015 This manual applies to the PmodDA3 rev. B Overview The PmodDA3 is a 16-bit digital-to-analog converter (DAC) with an SMA connector for high resolution and low noise analog output. Features include:      SPI-like communication interface Uses the Analog Devices AD5541A 16-bit DAC 2.5V reference voltage Very low noise The PmodDA3.
PAGE 2
PmodDA3™ Reference Manual LDAC is at a high voltage state. Pulsing the LDAC pin low and then high will asynchronously transfer all of the data into the DAC register, resulting in the appropriate analog voltage on the SMA connector. Alternatively, users may hold the LDAC pin at a logic level low voltage when bringing the CS pin high to directly transfer the data from the shift register to the DAC register.