Evaluation Board User Guide
UG-459
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
Evaluation Board for AD5686R/AD5686/AD5684R/AD5684
16-/12-Bit, Quad Channel Voltage Output DAC
FEATURES
The AD568x(R) is used in this user guide to refer to the AD5686R,
AD5686, AD5684R, and AD5684.
Full-featured evaluation board for the AD5686R, AD5686,
AD5684R, and AD5684
On-board references
Various link options
PC control in conjunction with Analog Devices, Inc., System
Demonstration Platform (SDP)
The evaluation board is designed to help customers quickly
prototype new AD568x(R) circuits and reduce design time.
The AD568x(R) operates from a single 2.7 V to 5.5 V supply.
The AD5686R and AD5684R incorporate an internal 2.5 V
reference to give an output voltage span of 2.5 V or 5 V. The
AD5686 and AD5684 require an external reference.
PACKAGE CONTENTS
Full data on the AD568x(R) can be found in the appropriate data
sheet available from Analog Devices and should be consulted in
conjunction with this user guide when using the evaluation board.
AD5686/AD5686R or AD5684/AD5684R evaluation board
CD includes
Self-installing software that allows users to control the
board and exercise all functions of the device
Electronic version of the AD5686R, AD5686, AD5684R, and
AD5684 data sheets
Electronic version of UG-459
The evaluation board interfaces to the USB port of a PC via the
SDP board. Software is supplied with the evaluation board to
allow the user to program the AD568x(R).
This evaluation board requires the EVAL-SDP-CB1Z board
(SDP-B controller board), which is available for order on the
Analog Devices website at www.analog.com.
GENERAL DESCRIPTION
This user guide details the operation of the evaluation board for
the AD5686R, AD5686, AD5684R, and AD5684 quad channel,
voltage output digital-to-analog converters (DACs).
The EVAL-AD5686RSDZ supports both the AD5686R and
AD5686, and the EVAL-AD5684RSDZ supports both the
AD5684R and AD5684.
EXT_REF
AGND
VDD
VLOGIC
DGND
DGND
+6V
EVALUATION BOARD BLOCK DIAGRAM
3V REF
EEPROM
VREF
SPI
VOU TA
AD5686
AD5684
VOUTC
VREF
VOUTA1
10 WAY
HEADER
SPI
AD5686R
AD5684R
VOUTB
VOUTD
VOUTB1
VOUTC1
VOUTD1
Figure 1.
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 12
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SDP CONNECTOR
5V REF
UG-459
Evaluation Board User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Board Software ...............................................................4
Package Contents .............................................................................. 1
Installing the Software ..................................................................4
General Description ......................................................................... 1
Running the Software ...................................................................4
Evaluation Board Block Diagram ................................................... 1
Software Operation .......................................................................5
Revision History ............................................................................... 2
SPI Command................................................................................5
Evaluation Board Hardware ............................................................ 3
Evaluation Board Schematics and Artwork ...................................6
Power Supplies .............................................................................. 3
Ordering Information .................................................................... 10
Link Options ................................................................................. 3
Components List ........................................................................ 10
REVISION HISTORY
9/12—Revision 0: Initial Version
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EVALUATION BOARD HARDWARE
POWER SUPPLIES
LINK OPTIONS
To use the evaluation board with the SDP board, a 6 V power
supply is required, which is connected to Connector J3. The
evaluation board can be used without the SDP board. In this case,
the J1 and J2 connectors are used as the power supply inputs.
A number of link options are incorporated in the evaluation
board and must be set for the required operating conditions
before using the board. The functions of these link options are
described in detail in Table 3. Table 2 lists the positions of the
different links controlled by PC, via the USB port, and the SDP
board in single-supply mode is required.
Both AGND and DGND inputs are provided on the board. The
AGND and DGND planes are connected at one location close
to the AD568x(R). It is recommended that AGND and DGND
not be connected elsewhere in the system to avoid ground loop
problems.
All supplies are decoupled to ground with 10 µF tantalum and
0.1 µF ceramic capacitors.
Table 1. Power Supply Connectors
Connector Number
J1
J2
J3
Voltage
External, VLOGIC supply
Analog power supply, VDD
6 V board positive power supply
Table 2. Link Options Setup for SDP Control (Default)
Link Number
LK1
LK2
LK3
LK4
LK5
LK6
Option
A
A
C
B
A
B
Table 3. Link Functions
Link Number
LK1
LK2
LK3
LK4
LK5
LK6
Option
This link selects the DAC analog voltage source.
Position A selects the internal voltage source (INT_VDD) from the ADP3331.
Position B selects an external supply voltage (EXT_VDD).
This link selects the DAC digital voltage source.
Position A selects the digital voltage source from the SDP board (V_IO).
Position B selects an external digital supply voltage (EXT_VLOGIC).
This link selects the reference source.
Position A selects the on-board 2.5 V reference as the reference source. Do not use this option with the AD5686R/AD5684R.
Position B selects the on-board 5 V reference as the reference source. Do not use this option with the AD5686R/AD5684R.
Position C selects the internal reference of the AD5686R/AD5684R as the reference source for the AD5686/AD5684.
Position D selects an off board voltage reference via the EXT_REF connector.
This link selects the gain setting of the AD5686/AD5684 (not populated).
Position A selects gain of 2.
Position B selects gain of 1.
This link selects the gain setting of the AD5686R/AD5684R.
Position A selects gain of 2.
Position B selects gain of 1.
This link selects whether the AD5686R/AD5684R or AD5686/AD5684 is accessed by the software.
Position A selects the AD5686/AD5684.
Position B selects the AD5686R/AD5684R.
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Evaluation Board User Guide
EVALUATION BOARD SOFTWARE
INSTALLING THE SOFTWARE
3.
The evaluation kit for the AD568x(R) includes self-installing
software on the CD. The software is compatible with Windows® XP,
Windows Vista (32-bit) and Windows 7 (32-bit). If users need drivers
for 64-bit operating systems, contact Linear.Apps@analog.com.
Click Start > All Programs > Analog Devices > AD56x(R).
Each of the AD5686R, AD5686, AD5684R, and AD5684 has
its own version of software. Click the appropriate one to run
the software. As the software connects to the evaluation
board, the message in Figure 2 displays.
10954-002
The software must be installed before connecting the SDP board to
the USB port of the PC to ensure that the SDP board is recognized
when it connects to the PC.
To install the software, take the following steps:
1.
2.
3.
4.
5.
Start the Windows operating system and insert the CD.
The installation software should open automatically. If it does
not open automatically, run the setup.exe file from the CD.
After installation is completed, power up the evaluation
board as described in the Power Supplies section.
Connect the evaluation board to the SDP board and the SDP
board into the PC using the USB cable included in the box.
When the software detects the evaluation board, proceed
through any dialog boxes that appear to finalize the
installation.
Figure 2. Connection Message
If the SDP board is not connected to the USB port when
the software is launched, a connectivity error displays (see
Figure 3 ). Simply connect the evaluation board to the USB
port of the PC, wait a few seconds, click Rescan, and follow
the instructions.
RUNNING THE SOFTWARE
1.
2.
Connect the evaluation board to the SDP board and connected
the USB cable between the SDP board and the PC.
Power the SDP and evaluation board by connecting 6 V to
the J3 connector.
Rev. 0 | Page 4 of 12
10954-003
To run the program, do the following:
Figure 3. Connectivity Error
Alternatively, the software can be used without an evaluation
board. The software runs in simulation mode displaying
expected outputs based on the input data. The main
window of the AD568x(R) evaluation software then
opens, as shown in Figure 4.
UG-459
10954-004
Evaluation Board User Guide
Figure 4. AD568x(R) Evaluation Board Software Main Window
GAIN Control
SOFTWARE OPERATION
The software for the AD568x(R) allows the user to program
values to the input and DAC registers of each DAC individually
or collectively.
The logic level of the GAIN pin is set externally by LK4 or LK5.
To display the correct voltage, the gain selection must be set to
match the level of the pin.
Write to Input Register
Reference Control
Select Write to Input Register to load the value in the input
data control to the input register of any DACs selected in the
Select DACs to Use box.
The AD5686R and AD5684R have an on-chip reference that
can be disabled to reduce power consumption. The AD5686R
and AD5684R software has a control that allows this function to
be used.
Write to DAC Register
Select Write to DAC Register to load the value in the input data
control to the DAC register of any DACs selected in the Select
DACs to Use box. The DAC outputs are automatically updated
with the appropriated voltage.
The AD5686 and AD5684 require an external reference. The
software for the AD5686 and AD5684 has a control that allows
the user to set the reference voltage.
Update DAC Register from Input Register
Each of the DACs can be powered down individually. Each of the
DACs has an associated selection box allowing the part to operate
in normal mode, powered down with either a 1 kΩ or a 100 kΩ
resistor to ground or tristate. When the power-down setting for
each DAC are selected, click Write to Part to write the appropriate
values to the AD568x(R).
Select Update DAC Register from Input Register to copy the
value in a DAC input register to the corresponding DAC register.
DAC outputs are automatically updated with the appropriated
voltage.
LDAC CONTROL
Select Pulse LDAC to bring the LDAC pin low and then back
high. Do this copies the data from the input registers to the DAC
registers, and the outputs update accordingly. Any DAC updates
disabled by the LDAC mask settings are ignored.
The LDAC pin can also be set high or low by clicking the
appropriate radio button.
Power-Down Control
LDAC Mask Register
Each of the DACs can be set to accept or ignore LDAC pulses.
When the LDAC selections are completed, click Write to Part
to write the appropriate values to the AD568x(R).
SPI COMMAND
On both control tabs of the software, the SPI commands sent to the
DAC display. This shows what must be written to the AD568x(R)
to replicate the function of the evaluation board.
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Evaluation Board User Guide
EVALUATION BOARD SCHEMATICS AND ARTWORK
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Figure 5. AD568x(R) Schematic (Page 1 of 2)
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Figure 6. AD568x(R) Schematic (Page 2 of 2)
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Evaluation Board User Guide
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Figure 7. AD568x(R) Component Silkscreen
Figure 8. AD568x(R) Top Side Routing
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Evaluation Board User Guide
Figure 9. AD568x(R) Bottom Side Routing
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Evaluation Board User Guide
ORDERING INFORMATION
COMPONENTS LIST
Table 4.
Qty
1
1
Reference Designator
U7
U5
1
1
U1
U3
1
U6
1
U4
8
VOUTA,VOUTA1, VOUTB, VOUTB2,
VOUTC, VOUTC1, VOUTD, VOUTD1
L1
R1
R2
J4
U2
1
1
1
1
1
1
1
2
2
2
3
3
4
8
9
10
17
C14
R3
R8, R9
R17, R18
R4, R11
J5, LK3, LK6
J1, J2, J3
LK1, LK2, LK4, LK5
C1, C3, C5, C7, C8, C9, C16, C20
TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9
C2, C4, C6, C10, C11, C12, C15, C21, C22, C23
C13, C17, C18, C19, C24, C25, C26, C27,
R5, R6, R7, R10, R12, R13, R14, R15, R16
Description
Quad, 16-bit/12-bit nanoDAC+ with SPI interface
Quad, 16-bit/12-bit nanoDAC+ with 2 ppm/°C
on-chip reference and SPI interface
High accuracy, ultralow quiescent current LDO, SOT-23
5 V fixed, adjustable low dropout linear voltage
regulator
Ultralow noise XFET 2.5 V voltage reference with
current sink and source capability
Ultralow noise XFET 5.0 V voltage reference with
current sink and source capability
50 Ω SMB jack
Supplier/Part Number
Analog Devices AD5686/AD5684
Analog Devices AD5686R/AD5684R
Ferrite bead, 600 Ω at 100 MHz
0603, 300 kΩ resistor
Resistor, 1 MΩ, 1%, 0.063W, 0603
120-pin female connector
32K, I2C serial EEPROM (24LC32)
Digi-Key 490-1024-1-ND
Digi-Key 541-300KHCT-ND
Digi-Key RMCF1/161MFRCT-ND
FEC 1324660 or Digi-Key H1219-ND
FEC 1331330
Capacitor, 0603, 1 µF, 10 V
Resistor, 1.5 Ω, 5%, 0.063W, 0603
10 kΩ SMD resistor
100 kΩ SMD resistor
0 Ω resistor, 0805
Terminal block, 8-pin (4 × 2) 0.1" header
2-pin terminal block
Jumper block using 3-pin SIP header
Case A, 10 µF capacitor
Red test point
Capacitor, 0.1 µF, 50 V, 0603
Do not populate (DNP)
FEC 318-8840
FEC 9331832
FEC 9330399
FEC 9330402
FEC 9333681
FEC 1022244
FEC 151789
FEC 1022248 and FEC 150410
FEC 197-130
FEC 8731144 (pack)
FEC 8820023
Not Inserted
Rev. 0 | Page 10 of 12
Analog Devices ADP3331
Analog Devices ADP3367
Analog Devices ADR431
Analog Devices ADR435
FEC 1206013
Evaluation Board User Guide
UG-459
NOTES
Rev. 0 | Page 11 of 12
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Evaluation Board User Guide
NOTES
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions
set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you
have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice
to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF
THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE
AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable
United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
©2012 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG10954-0-9/12(0)
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