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Digilent PmodAD5™ Analog to

Digital Voltage Converter

Revision: January 24, 2013

Note: This document applies to REV A of the board

1300 Henley Court | Pullman, WA 99163

(509) 334 6306 Voice and Fax

Doc: 502-243 page 1 of 2

Overview

The PmodAD5 is a high resolution analog-to-

digital converter built around the Analog

Devices AD7193 Sigma-Delta ADC.

Features include:

• SPI communication interface

• 24-bit resolution

• fast settling filter

• conversion synchronization

• five filter options

• four differential analog inputs or eight

pseudo-differential inputs

• two SMA connector inputs

Functional Description

The PmodAD5 has ten analog inputs that

correspond to eight data lines. The two SMA

female connectors route to inputs one and two,

while eight standard female header pins route

to inputs one through eight.

Customers can set the PmodAD5 into single or

continuous conversion mode. The PmodAD5

powers up by default in continuous conversion

mode. You can set the mode to start a

conversion by either writing to the appropriate

registers or on the rising edge of SYNC.

Note: Please see the AD7193 data sheet,

available from www.analog.com, for more

detailed information on controlling the A/D

Converter.

Serial Interface

The PmodAD5 has a 4-wire SPI

communication interface. (See Table 1 for

signal descriptions.)

Analog Inputs

The analog inputs (AIN) on the PmodAD5 are

configurable as four differential inputs or as

eight pseudo-differential inputs. AINCOM

serves as a common reference for AIN

channels 1 through 8 under the eight pseudo-

differential input configuration setting.

When operating the PmodAD5 analog inputs

as four differential inputs, the adjacent inputs

correspond to positive and negative differential

signals. For example, AIN1/ AIN2 represent

one positive/negative differential pair and

AIN3/AIN4 represent the second

positive/negative differential pair.

Connectors J5 and J6 are SMA female analog

inputs that correspond to AIN1 and AIN2

respectively.

Reference Supply and GPO

The PmodAD5 has a maximum of four general

purpose output (GPO) signals. Operators can

access these signals from headers J2 or J3.

Please see Table 1 for signal descriptions.

GPO pins 1 and 0 also correspond to REFIN2+

and REFIN2-. These pins can be configured to

supply the conversion/calibration reference

voltage for the PmodAD5.

1 2

Resumo do Conteúdo

Página 1 - Digital Voltage Converter

Digilent PmodAD5™ Analog to Digital Voltage Converter Revision: January 24, 2013 Note: This document applies to REV A of the board 1300 Henley Court

Página 2 - Analog Supply Voltage

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