Digilent 410-243P - Manual

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