Evaluation Board User Guide
UG-442
One
Technology
Way
•
P.O.
Box
9106
•
Norwood,
MA
02062-9106,
U.S.A.
•
Tel:
781.329.4700
•
Fax:
781.461.3113
•
www.analog.com
Evaluating the
AD5422
Single Channel, 16-Bit, Current Source and Voltage Output
DAC, HART Connectivity
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. C | Page 1 of 16
FEATURES
Full-featured evaluation board for the
AD5422
On-board reference
Link options
Direct hook-up to USB port of PC
PC software for control
EVALUATION BOARD DESCRIPTION
The EVAL-AD5422 is a full-featured evaluation board that is
designed to allow the user to easily evaluate all features of the
16-bit
AD5422
current source and voltage output digital-to-
analog converter (DAC). All of the
AD5422
pins are accessible
at on-board connectors for external connection. The board can
be controlled by two means, via the on-board connector (J8) or via
the USB port of a Windows® 2000-, NT®-, XP®-based PC using the
AD5422
evaluation software. The default setup is for control via
the USB port.
Two separate packages exist for the
AD5422
(24-lead TSSOP and
40-lead LFCSP); therefore, two corresponding evaluation boards
are available.
DEVICE DESCRIPTION
The
AD5422
is a low cost, precision, fully integrated 16-bit
converter, offering a programmable current source and
programmable voltage output designed to meet the requirements
of industrial process control applications. The output current
range is programmable to 4 mA to 20 mA, 0 mA to 20 mA, or an
overrange function of 0 mA to 24 mA. The voltage output is
provided from a separate pin that can be configured to provide
0 V to 5 V, 0 V to 10 V, ±5 V or ±10 V output ranges; an overrange
of 10% is available for all ranges. Analog outputs are short- and
open-circuit protected and can drive capacitive loads of 1 μF. The
device is specified to operate with a power supply range from
10.8 V to 40 V. The output loop compliance is 0 V to AV
DD
− 2.5 V.
Complete specifications for the
AD5422
are available in the
AD5422
data sheet and should be consulted in conjunction
with this document when using the evaluation board.
FUNCTIONAL BLOCK DIAGRAM
USB
CONNECTOR
POWER SUPPLY INPUTS
PIN
HEADER (J8)
CONTROLLER
CY7C68013A
SELECT
ADC
REFIN
INPUT/
OUTPUT
REFOUT
AD5422
5V
VOLTAGE
REFERENCE
EXT REF
I TO V
V
OUT
I
OUT
08
230
-001
Figure 1.
