Evaluation Board for 12-/14-Bit, Serial
Input, Dual Channel, Current Output DACs
EVAL-AD5444/AD5446
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes.
Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or
statutory including, but not limited to, any implied warranty of merchantability or fitness for a
particular purpose. No license is granted by implication or otherwise under any patents or other
intellectual property by application or use of evaluation boards. Information furnished by Analog
Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result
from its use. Analog Devices reserves the right to change devices or specifications at any time
without notice. Trademarks and registered trademarks are the property of their respective owners.
Evaluation boards are not authorized to be used in life support devices or systems.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2008 Analog Devices, Inc. All rights reserved.
FEATURES
Operates from dual ±12 V and +5 V supplies
On-board reference and output amplifiers
Direct hookup to the printer port of a PC
PC software for control of the DAC
GENERAL DESCRIPTION
This data sheet describes the evaluation board for the
AD5444/AD5446 DACs. The AD5444/AD5446 are, respect-
ively, CMOS 12-/14-bit current output, digital-to-analog
converters (DACs). They operate from a +2.5 V to +5.5 V
power supply, making them suited to battery-powered and
other applications.
These DACs use data readback, allowing the user to read the
contents of the DAC register via the DB pins. On power-up, the
internal register and latches are filled with zeros and the DAC
output is at zero scale.
Because the DACs are manufactured on a CMOS submicron
process, they offer excellent four-quadrant multiplication
characteristics.
The applied external reference input voltage (VREF) determines
the full-scale output current. An integrated feedback resistor
(RFB) provides temperature tracking and full-scale voltage
output when combined with an external I-to-V precision amplifier.
Complete information about the DAC can be found in the
AD5444/AD5446 data sheet that is available from Analog
Devices, Inc.; it should be consulted in conjunction with this data
sheet when using the evaluation board.
PACKAGE CONTENTS
The board consists of the AD5444/AD5446 and a current-to-
voltage amplifier (AD8065). Included on the evaluation board is
a 10 V reference (ADR01). Also, an external reference can be
applied via an SMB input connector, and the SDO readback
function can be enabled. The LDAC function is not available
with the AD5444/AD5446.
Included in the evaluation kit is a CD ROM with self-installing
software to control the DAC. The software allows the user to
exercise all functions of the AD5444/AD5446.
FUNCTIONAL BLOCK DIAGRAM
05519-001
36-WAY CENTRONICS
CONNECTOR
SYNC SCLKSDIN
AD8065
I-TO-V
V
REF
V
OUT
VDDA VDD AGND VSS
ADR01
REFERENCE
AD5444/AD5446
12-/14-BIT DAC
Figure 1.
EVAL-AD5444/AD5446
Rev. 0 | Page 2 of 8
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description......................................................................... 1
Package Contents.............................................................................. 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Evaluation Board Hardware and Software.................................... 3
Evaluation Board Hardware........................................................ 3
Evaluation Board Software...........................................................3
Evaluation Board Schematics and Artwork...................................4
Ordering Information.......................................................................7
Bill of Materials..............................................................................7
Ordering Guide .............................................................................7
ESD Caution...................................................................................7
REVISION HISTORY
2/08—Revision 0: Initial Version
EVAL-AD5444/AD5446
Rev. 0 | Page 3 of 8
EVALUATION BOARD HARDWARE AND SOFTWARE
EVALUATION BOARD HARDWARE
The board requires ±12 V and +5 V supplies. The +12 V VDD
and the −12 V VSS power the output amplifier, whereas the +5 V
VDD1 powers the DAC. All supplies are decoupled to ground
with 10 μF tantalum and 0.1 μF ceramic capacitors.
Link LK1 can be used to connect the on-board reference to the
VREF input, and Link LK2 can be used to enable the SDO
readback function on-board.
EVALUATION BOARD SOFTWARE
Software Installation
The evaluation kit includes self-installing software on a
CD ROM. The software is compatible with Windows® 95,
Windows 97, Windows 2000, Windows NT, and Windows XP.
If the setup file does not run automatically when you insert the
CD, run the setup.exe file directly from the CD.
Software Operation
1. Ensure that the Centronics cable connects the PC to the
evaluation board.
2. From the Analog Devices menu, click Start > All
Programs > Analog Devices >AD5444_46 >AD5444_46
Evaluation Software.
For older PCs, click Start > Programs > Analog Devices
>AD5444_46 >AD5444_46 Evaluation Software.
The AD5444/46 Evaluation Software dialog box opens, as
shown in Figure 2.
0
5519-002
Figure 2. AD5444/46 Evaluation Software Dialog Box
3. To have the data clocked on the rising edge, select the
Clock Data on Rising Edge check box.
Deselect this option for the default setting (data is clocked
on the falling edge).
4. To disable daisy chaining, select the Disable SDO check
box.
Deselect this option for the default setting (daisy chaining
enabled).
5. To select the resolution of the part on the evaluation board,
click the appropriate option button under Select Device.
6. Click OK to open the main window with drop-down
menus (File, Printer Port, and Help), as shown in Figure 3.
05519-003
Figure 3. Main Window
The main window allows you to write a data-word to the
DAC. You must enter the 12- or 14-bit word in
hexadecimal. The main window also allows you to select
the control functions of the AD5444/AD5446, as follows:
• No Operation: The DAC is not being used.
• Load and Update: Loads the DAC register with the
entered data-word and displays the output in the
Readback Value field, also in the main window.
The Printer Port menu allows you to select the printer
port address to be used from a list of available addresses.
EVAL-AD5444/AD5446
Rev. 0 | Page 4 of 8
EVALUATION BOARD SCHEMATICS AND ARTWORK
05519-004
V
REF
U1
AD5444/AD5446
P1–19
P1–20
P1–21
P1–22
P1–23
P1–24
P1–25
P1–26
P1–27
P1–28
P1–29
P1–30
P2–3
P2–2
P2–1
P2–4
AGND
V
SS
V
DD
1
C11
0.1µF C12
10µF
C13
0.1µF C14
10µF
C15
0.1µF C16
10µF
+
+
+
V
DD
V
SS
U3
C7 10µF
C8 0.1µF
7
4
3
26
–VS
+VS
+
C9 10µF
C10 0.1µF
+
TP1
J1
V
OUT
J3
J4
J5
J6
LK2A
B
GND
I
OUT
2
I
OUT
1
R
FB
V
DD
SDO
SYNC
SDIN
SCLK 10
1
2
3
9
4
5
6
7
SDO/LDAC
SYNC
SDIN
SCLK
SDO
LDAC
SYNC
SDIN
SCLK
P1–2
P1–3
P1–4
P1–5
P1–13
V
IN
V
OUT
TRIM GND
U2
ADR01AR
4
26
5
C4
0.1µF
C1
0.1µF
V
DD
1
C2
10µF
C6
4.7pF
R1
J2
V
REF
V
REF
C3
10µF
V
DD
1
C5
0.1µF
V
DD
1
8
LK1
AD8065AR
Figure 4. Evaluation Board Schematic
EVAL-AD5444/AD5446
Rev. 0 | Page 5 of 8
05519-005
Figure 5. Component-Side Artwork
05519-006
Figure 6. Silkscreen
—
Component-Side View (Top)
EVAL-AD5444/AD5446
Rev. 0 | Page 6 of 8
05519-007
Figure 7. Solder-Side Artwork
EVAL-AD5444/AD5446
Rev. 0 | Page 7 of 8
ORDERING INFORMATION
BILL OF MATERIALS
Table 1.
Qty.
Reference
Designator Part Description PCB Decal Supplier/Part Number1SMD
Layer
Name
8 C1, C4, C5, C8, C10,
C11, C13, C15
0.1 μF, 10%, X7R ceramic capacitor 0603 FEC 499-675 Yes Top
1 C2 10 μF, 10 V, 10% Tantalum
capacitor, Taj series
CAP\TAJ_A FEC 197-130 Yes Top
6 C3, C7, C9, C12,
C14, C16
10 μF, 20 V, 10% Tantalum
capacitor, Taj series
CAP\TAJ_B FEC 197-427 Yes Top
1 C6 4.7 pF, 10% NPO ceramic capacitor 0603 FEC 721-920 Yes Top
6 J1 to J6 SMB socket SMB FEC 310-682 No Top
1 LK1 2-pin header (2 × 1) SIP-2P FEC 511-705 and FEC 140-411 No Top
1 LK2 3-pin header (3 × 1) LINK-3P-
NOTEXTSIP-2P
FEC 511-717 and FEC 140-411 No Top
1 P1 36-pin Centronics connector 36WAY FEC 147-753 No Top
1 P2 4-pin terminal block CON\POWER6 FEC151-791 No Top
1 R1 0 Ω, 0.063 W resistor 0603 FEC 772-227 Yes Top
6 SCLK, SDIN, SYNC,
TP1, SDO, VREF
Red testpoint TESTPOINT FEC 240-345 (Pack) No Top
1 U1 AD5444/AD5446 MSO10 Analog Devices
AD5444YRM/AD5446YRM
Yes Top
1 U2 ADR01 SO8NB Analog Devices ADR01AR Yes Top
11 U3 AD8065 SO8NB Analog Devices AD8065AR Yes Top
N/A Rubber stick-on feet, each corner FEC 148-922
1 FEC indicates the Farnell Electronic Components company.
ORDERING GUIDE
Model Description
EVAL-AD5444EBZ1 AD5444 Evaluation Board
EVAL-AD5446EBZ1 AD5446 Evaluation Board
1Z = RoHS Compliant Part.
ESD CAUTION
EVAL-AD5444/AD5446
Rev. 0 | Page 8 of 8
NOTES
©2008 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
EB05519-0-2/08(0)
