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1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodAD5™ Reference Manual

Revised April 10, 2015

This manual applies to the PmodAD5 rev. A

DOC#: 502-243

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

Page 1 of 4

Overview

The Digilent PmodAD5 is an analog-to-digital converter (ADC) that utilizes a fourth order Σ-Δ modulator, a

programmable gain array, and on-chip digital filtering including a variety of sinc filters and zero latency features.

1 Functional Description

The PmodAD5 utilizes Analog Devices AD7193 to provide 4 differential or 8 pseudo differential analog inputs. With

24-bit resolution and rms noise as low as 11 nV, highly accurate voltage measurements can be taken.

2 Interfacing with the Pmod

The PmodAD5 communicates with the host board via the SPI protocol. By driving the Chip Select line low, users can

transfer information to and from the device with the most significant bit (MSB) first.

The default setting of the AD7193 upon power-up is that a single analog-to-digital conversion is made comparing

the voltage difference between pins A1 (+) and A2 (-) on header J2. The input voltage that is allowed with the

default settings is ±19.53 mV with respect to the on-board reference voltage of 2.5V. Users are able to receive the

24 bits of data by first pulling the chip select line low and waiting the required conversion and settling time (100

ms by default). Users can then write to the communications register to indicate that they want to read the data

The PmodAD5.

 24-bit resolution

 4 differential or 8 pseudo differential input channels

 Simultaneous 50 Hz/60 Hz rejection

Features include:

Summary of content (4 pages)

PAGE 1
300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodAD5™ Reference Manual Revised April 10, 2015 This manual applies to the PmodAD5 rev. A Overview The Digilent PmodAD5 is an analog-to-digital converter (ADC) that utilizes a fourth order Σ-Δ modulator, a programmable gain array, and on-chip digital filtering including a variety of sinc filters and zero latency features.
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PmodAD5™ Reference Manual and then clock in the 24 bits of data from the data register and finally pull the chip select line back to a high voltage state. An example of what the data stream might look like is given below: Communications Register ~Wen R/~W 0 1 Data Register Address 0 1 CREAD 0 0 0 0 0 1 Data Register Read Bits D23-D0 Table 1. Example data stream of the measured differential voltage. Some users may wish to have a wider voltage range than 2.5V ±19.
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PmodAD5™ Reference Manual 2.1 Pinout Description Table Pin Signal Description 1 CS Chip Select 2 MOSI Master-Out-Slave-In 3 MISO Master-In-Slave-Out 4 SCK Serial Clock 5 GND Power Supply Ground 6 VCC Power Supply (3.3V/5V) Table 3. Pmod header J1.
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PmodAD5™ Reference Manual 3 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 1.9 inches long on the sides parallel to the pins on the pin header and 0.8 inches long on the sides perpendicular on the pin header. Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.