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EVAL-AD5420EBZ

P1-P3P4-P6P7-P9P10-P12
Evaluation Board User Guide
UG-441
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Te l: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the AD5420 Single-Channel, 16-Bit, Serial Input, Current Source DAC
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. D | Page 1 of 12
FEATURES
Full-featured evaluation board for the AD5420
On-board reference
Link options
Direct hook-up to USB port of PC
PC software for control
EVALUATION BOARD DESCRIPTION
The EVAL-AD5420 is a full-featured evaluation board, designed to
allow the user to easily evaluate all features of the AD5420 current
source, 16-bit digital-to-analog converter (DAC). All of the
AD5420 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 AD5420 evaluation software. The
default setup is for control via the USB port.
DEVICE DESCRIPTION
The AD5420 is a low cost, precision, fully integrated 16-bit
converter, offering a programmable current source output designed
to meet the requirements of industrial process control applications.
The output current range is programmable from 4 mA to 20 mA,
0 mA to 20 mA, or an overrange function of 0 mA to 24 mA.
The output is open-circuit protected. The device is specified to
operate with a power supply range from 10.8 V to 40 V. Output
loop compliance is 0 V to AV
DD
− 2.5 V.
Complete specifications for the AD5420 are available in the
AD5420 data sheet available from Analog Devices, Inc., and
should be consulted in conjunction with this user guide when
using the evaluation board.
FUNCTIONAL BLOCK DIAGRAM
REFIN
I
OUT
ADC
AD5420
EXT REF
SELECT
INPUT/
OUTPUT
REFOUT
POWER SUPPLY INPUTS
5V
VOLTAGE
REFERENCE
USB
CONNECTOR
CONTROLLER
CY7C68013
PIN HEADER (J8)
I TO V
08160-001
Figure 1.
UG-441 Evaluation Board User Guide
Rev. D | Page 2 of 12
TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Board Description......................................................... 1
Device Description ........................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Evaluation Board Hardware ............................................................ 3
Power Supplies .............................................................................. 3
Link Options ..................................................................................3
Evaluation Board Software ...............................................................5
Software Installation .....................................................................5
Software Operation .......................................................................5
Evaluation Board Schematics and Artwork ...................................7
Ordering Information .................................................................... 10
Bill of Materials ........................................................................... 10
REVISION HISTORY
10/13—Rev. C to Rev. D
Added Text to Evaluation Board Schematics and Artwork
Section ................................................................................................ 7
Changes to C3 Supplier Number; Table 5 ................................... 10
3/13—Rev. B to Rev. C
Change to Control Register Section and Added Figure 4;
Renumbered Sequentially ................................................................ 6
11/12—Rev. A to Rev. B
Change to Table 5 ........................................................................... 10
7/12—Rev. 0 to Rev. A
Document Title Changed from EVA L -AD5420 to
UG-441 ................................................................................. Universal
Changes to Figure 3 .......................................................................... 5
Changes to Figure 4 .......................................................................... 7
Changes to Figure 5 .......................................................................... 8
Changes to Figure 6 to Figure 8 ...................................................... 9
Changes to Table 5 .......................................................................... 10
4/09—Revision 0: Initial Version
Evaluation Board User Guide UG-441
Rev. D | Page 3 of 12
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The following external supplies must be provided:
• 5 V between the 5 V and 0 V inputs for the digital supply of
the AD5420 and digital circuitry. Alternatively, place LK6
in Position A to power the digital circuitry from the USB
port (default).
• 10.8 V to 40 V between the AV
DD
and GND inputs for the
analog supply of the AD5420.
• 10.8 V to 16.5 V between the V+ and AGND inputs for the
analog supply of the AD7321 (on-board analog-to-digital
converter [ADC]) and ADR435 (on-board voltage reference).
If the analog supply connected to the AV
DD
input is less than
16.5 V, the AD7321 and ADR435 can be powered from this
by placing LK9 in Position A, and the V+ input can be left
unconnected.
The analog and digital planes are connected at one location, close
to the AD5420. It is recommended not to connect AGND and
DGND elsewhere in the system to avoid ground loop problems.
Each supply is decoupled to the relevant ground plane with 10 µF
and 0.1 µF capacitors. Each device supply pin is again decoupled
with a 10 µF and 0.1 µF capacitor pair to the relevant ground plane.
Excessive Power Supply
If a power supply in excess of 16.5 V is connected to the AV
DD
input, LK9 must be in Position B to prevent potential damage
to the 5 V voltage reference and to the ADC (see U2 and U6,
respectively, in Figure 6).
LINK OPTIONS
The position of LK7 configures the board for either PC control via
the USB port (default setup) or for control by an external source
via J8. Set the link options on the evaluation board for the required
operating setup before using the board. The functions of the link
options are described in Table 4.
Default Link Option Setup
The default setup is for control by the PC via the USB port. The
default link options are listed in Table 1.
Table 1. Link and Switch Options for PC Control
Link No. Option
LK1 Not applicable
LK2
A
LK3 Inserted
LK4 Not applicable
LK5 B
LK6 A
LK7 A
LK8
A
LK9 A
LK10 Inserted
LK11 Not applicable
LK12 Not applicable
LK13
Inserted
LK14 Not applicable
LK15 C
LK16 Not applicable
LK17 Inserted
LK18 Inserted
Connector J8 Pin Descriptions
Table 2. Connector J8
1
Pin Configuration
2 4 6 8 10
1 3 5 7 9
1
LK7 must be in Position B to enable the use of J8.
Table 3. Connector J8 Pin Descriptions
Pin No.
Description
1 SDO
2 Not applicable
3 Digital ground
4 Clear
5 Digital ground
6 Fault
7 SDIN
8 Digital ground
9 SCLK
10 Latch
P1-P3P4-P6P7-P9P10-P12

EVAL-AD5420EBZ

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Buy EVAL-AD5420EBZ
Manufacturer:
Analog Devices Inc.
Description:
Data Conversion IC Development Tools EVAL BRD AD5420
Lifecycle:
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