Single Channel, 18-Bit, Serial Input,
Voltage Output DAC Evaluation Board
EVAL-AD5680
FEATURES
GENERAL DESCRIPTION
Full-featured evaluation board for AD5680
On-board reference
On-board ADC for voltage readback
Various link options
Direct hook up to USB port of PC
PC software for control of DACs
Surface-mount and through-hole area
This data sheet describes the evaluation board for the 18-bit
AD5680 single channel DAC. The AD5680 has a maximum
output voltage span of 5 V derived from an external reference
voltage of 5 V. The reference voltage for this evaluation board is
derived from the REF195, which has an output voltage of 5 V.
Full data on the AD5680 is found in the data sheets available
from Analog Devices, Inc. and should be consulted in conjunction with this data sheet when using the evaluation board.
The evaluation board interfaces to the USB port of an IBMcompatible PC. The software available with the evaluation
board allows the user to easily program the AD5680.
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
©2007 Analog Devices, Inc. All rights reserved.
EVAL-AD5680
TABLE OF CONTENTS
Features .............................................................................................. 1
Software Installation .....................................................................4
General Description ......................................................................... 1
Software Operation .......................................................................4
Revision History ............................................................................... 2
Evaluation Board Schematics...........................................................5
Operating the AD5680 Evaluation Board ..................................... 3
Ordering Information.......................................................................9
Power Supplies .............................................................................. 3
Component Listing .......................................................................9
Filter ............................................................................................... 3
Ordering Guide .............................................................................9
Link Options ................................................................................. 3
ESD Caution...................................................................................9
Evaluation Board Software .............................................................. 4
REVISION HISTORY
11/07—Revision 0: Initial Version
Rev. 0 | Page 2 of 12
EVAL-AD5680
OPERATING THE AD5680 EVALUATION BOARD
POWER SUPPLIES
Table 1. Link Options Setup for PC Controls
The EVAL-AD5680 can be powered from the USB port. This is
the default setup. It can also be powered by an external supply
using the J6 and J7 power connectors
Link No.
LK1
LK2
LK3
LK4
LK5
LK6
LK9
Both AGND and DGND inputs are provided on the board. The
AGND and DGND planes are connected at one location close
to the AD5680. 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 also
decoupled with a 10 μF and 0.1 μF capacitor pair to the relevant ground plane.
Option
Inserted
A
Inserted
B
B
B
Inserted
LINK OPTIONS
FILTER
The AD5680 is suitable for closed-loop low bandwidth applications. Ideally, the system bandwidth acts as a filter on the
DAC output.
A number of link and switch options on the evaluation board
should be set for the required operating setup before using the
board. The functions of these link options are described in
detail in Table 2. The default setup is for control by the PC via
the USB port. The default link options are listed in Table 1.
A resistor capacitor network can be used to model the filter and
the system bandwidth. R2 and C1 are available for this RC filter
and have been left unpopulated for user flexibility.
Table 2. Link Options
Link No.
LK1
LK2
LK3
LK4
LK5
LK6
LK9
Function
This link connects the VFB pin to VOUT.
This link selects whether the AD5680 evaluation board is controlled by the PC via the USB port or by an external source via the
SMB connectors; J1, J3, J4.
Position A: the evaluation board is controlled by the PC via the USB port.
Position B: the evaluation board is controlled by an external source via the SMB connectors; J1, J3, J4.
This link connects external resistors and capacitor loads to the VOUT pin of the AD5680. See the Filter section for more details.
This link selects the reference source.
Position A: allows use of an alternative reference source.
Position B: the on-board REF195 5 V reference is the reference source
This link selects the AVDD power supply source for the analog circuitry.
Position A: J6 is the AVDD analog circuitry power supply source.
Position B: the USB 5 V power supply is the AVDD analog circuitry power supply source.
This link selects the DVDD power supply source for the digital circuitry.
Position A: J7 is the DVDD digital circuitry power supply source.
Position B: the USB 5 V power supply source is the digital circuitry power supply source.
This link connects the VOUT pin of the AD5680 to the VIN pin of the AD7476 ADC so that the DAC output value can be monitored
using the on-board ADC.
Rev. 0 | Page 3 of 12
EVAL-AD5680
EVALUATION BOARD SOFTWARE
SOFTWARE INSTALLATION
The AD5680EB evaluation kit includes self-installing software
on a CD-ROM. The software is compatible with Windows®
2000/Windows XP.
If the setup file does not run automatically when you insert the
CD, run the setup.exe file directly from the CD.
1.
2.
After the installation from the CD-ROM has completed,
connect the AD5680 evaluation board to the PC’s USB
port using the cable supplied.
When the software detects the evaluation board,
proceed through any dialog boxes that appear to
finalize the installation.
06273-001
Install the software before connecting the evaluation board
to the PC’s USB port to ensure that the evaluation board is
correctly recognized when connected to the PC.
Figure 1. Main Window
SOFTWARE OPERATION
To program the DAC, under Enter Data Word type in the data
word in hexadecimal format, and click Program DAC.
From the Analog Devices menu, click Start > All Programs >
Analog Devices >AD5680 >AD5680 Evaluation Software.
To read back the output voltage using the on-board ADC, click
Read Voltage.
For older PCs, click Start > Programs > Analog Devices >
AD5680 > AD5680 Evaluation Software.
The DAC output voltage for the AD5680 is given by
D ⎞
VOUT = VREF × ⎛⎜
⎟
⎝ 262144 ⎠
The main window opens, as shown in Figure 1.
Rev. 0 | Page 4 of 12
EVAL-AD5680
EVALUATION BOARD SCHEMATICS
3.3V
3.3V
R6
1kΩ
D1
A
K
LED
ADP3303-3.3
8
IN
7
IN
5
SD
USB_5V
C22
22pF
0603
C24 +
10µF
C7
10µF
C23
22pF
0603
GND
4
DGND
OUT
OUT
ERR
NR
+
C20
22pF
0603
1
2
6
3
C19
22pF
0603
U7
R9
0Ω
C18
22pF
0603
C17
22pF
0603
DGND
DGND
42
44
J10
USB-MINI-B
VBUS
D–
D+
IO
GND
SHIELD
DGND
54
1
2
3
4
5
3
7 11 17 27 32 43 55
33
34
35
36
37
38
39
40
ADC_CS
DIN
SCLK
SYNC
PB0/FD0
PB1/FD1
PB2/FD2
PB3/FD3
PB4/FD4
PB5/FD5
PB6/FD6
PB7/FD7
PD0/FD8
PD1/FD9
PD2/FD10
PD3/FD11
PD4/FD12
PD5/FD13
PD6/FD14
PD7/FD15
RESET
*WAKEUP
CLKOUT
U8
CY7C68013-CSP
9
D–
8
D+
DGND
PA0/INT0
PA1/INT1
PA2/*SLOE
PA3/*WU2
PA4/FIFOADR0
PA5/FIFOADR1
PA6/*PKTEND
PA7/*FLD/SLCS
C33
22pF
C34
22pF
C35
22pF
C36
22pF
XTALIN
6
DGND
ADC_SDATA
TP20
TP19
10 12 26 28 41 53 56
4
5
Y1
24MHz
C15
22pF
0603
C16
22pF
0603
DGND
DGND
DGND
3.3V
TP15
TP16
TP18
TP17
06273-002
C32
22pF
XTALOUT
GND
GND
GND
GND
GND
GND
GND
R18
10kΩ
18
19
20
21
22
23
24
25
45
46
47
48
49
50
51
52
16
SDA
15
SCL
IFCLK
RSVD
AGND
13
14
3.3V
C30
22pF
DGND
29
CTL0/*FLAGA
30
CTL1/*FLAGB
31
CTL2/*FLAGC
1
RDY0/*SLRD
2
RDY1/*SLWR
C28
22pF
R3
2.2kΩ
DGND
VCC
VCC
VCC
VCC
VCC
VCC
VCC
R5
100kΩ
R4
2.2kΩ
3.3V
AVCC
R7
100kΩ
8
7
6
5
DGND
C21
22pF
0603
3.3V
DGND
1
A0
VCC
2
U6
A1
WP
3
24LC01
A2
SCL
4
VSS
SDA
3.3V
C25
2.2µF
3.3V
3.3V
3.3V
DGND
Figure 2. Schematic of Controller Circuitry
Rev. 0 | Page 5 of 12
Figure 3. Schematic of AD5680 Circuitry
Rev. 0 | Page 6 of 12
C37
22pF
0603
DVDD
J3
LK2
A B
DGND
DVDD
J4
SYNC
C3
10µF
TP4 TP5 TP6
+
R8
1.5Ω
VDD
8
GND
AD5680
1
VOUT
VREF
C6
0.1µF
LK1
4
2
TP13 TP14
VFB
U1
AVDD
J6-2
AGND
AVDD
J6-1
3
SYNC
DIN
SCLK
DGND
5
7
6
TP7
J8
C2
22pF
0603
LK5
B A
THROUGH HOLE AREA
4
D1
7
D2
9
D3
12
D4
IN EN GND
1 15
8
2
S1A
U9
5
S2A ADG774
11
S3A
14
S4A
VDD
L2
BEAD
6 10 13
SURFACE MOUNT AREA
SCLK
DIN
SYNC
DVDD
3
DGND
J1
DGND
DIN
DGND
C4
10µF
SCLK
16
C5
+
22pF
0603
S2B
J7-2
DGND
S1B
DVDD AVDD
S3B
LK6
A B
S4B
DVDD
J7-1
LK9
TP10
VREF
J5
R1
TP1
C8
10µF
ADC_CS
ADC_SDATA
+
TP11
SCLK
R2
LK4
A B
DAC_V OUT
LK3
TP2
TP12
VS
3
2
1
U3
4
SCLK VDD
5
SDATA
6
CS
GND
2
AD7476_ADC
AVDD
SLEEP
GND
4
U4
REF195
OUTPUT
TP8
TP9
C1
J2
6
VIN
3
+
C12
0.1µF
C11
10µF
C10
1µF
C13
0.1µF
TP3
AVDD
DAC_V OUT
06273-003
USB_5V
EVAL-AD5680
06273-004
EVAL-AD5680
06273-005
Figure 4. Component Placement Drawing
Figure 5. Component Side PCB Drawing
Rev. 0 | Page 7 of 12
06273-006
EVAL-AD5680
Figure 6. Solder Side PCB Drawing
Rev. 0 | Page 8 of 12
EVAL-AD5680
ORDERING INFORMATION
COMPONENT LISTING
Table 3. Component Listing
Qty
1
1
1
1
1
1
1
1
Reference Designator
U1
U3
U4
U6
U7
U8
U9
Y1
1
C1
6
4
1
19
1
1
1
6
1
2
3
4
1
1
1
2
2
1
1
1
19
C3, C4, C7, C8, C11, C24
C6, C12, C13
C10
C2, C5, C15 to C23, C28, C30, C32 to C37
C25
D1
J10
J1 to J5, J8
L2
J6, J7
LK1, LK3, LK9
LK2, LK4 to LK6
R1
R2
R9
R3, R4
R5, R7
R6
R8
R18
TP1 to TP20
1
Description
AD5680BRJ-1 (8-lead SOT-23 package)
AD7476ART (ADC)
REF195
24LC01
ADP3303AR-3.3
CY7C68013-CSP
ADG774BRQ
24 MHz crystal
C1 (not inserted)
10 μF tantalum cap (TAJ-A package)
0.1 μF multilayer ceramic cap
1 μF (0805 package)
22 pF (0603 package)
2.2 μF (0603 package)
LED
USB-Mini-B
Gold 50 Ω SMB jack
Ferrite Bead
Power connectors
Header (2 × 1 pin)
Header (3 × 1 pin)
R1 (not inserted)
R2 (not inserted)
0 Ω (0805 package)
2.2 kΩ (0603 package)
100 kΩ (0603 package)
1 kΩ (0603 package)
1.5 Ω
10 kΩ (0603 package)
Testpoint
FEC = Farnell Electronics Components.
ESD CAUTION
ORDERING GUIDE
Model
EVAL-AD5680EBZ
Package Description
AD5680 Evaluation Board Kit
Rev. 0 | Page 9 of 12
Supplier/Part Number 1
Analog Devices, Inc.
Analog Devices, Inc.
Analog Devices, Inc.
FEC 9758070
Analog Devices, Inc.
CY7C68013-56LFC
Analog Devices, Inc.
FEC 950-9658
FEC 197-130
FEC 1216538
FEC 318-8899
FEC 722-005
Digikey 490-1552-1-ND
FEC 5790852
FEC 476-8309
FEC 1206013
FEC 9526862
FEC 151-789
FEC 1022247 & 150-411
FEC 1022249 & 150-411
FEC 9331662
FEC 9330810
FEC 933-0402
FEC 933-0380
FEC 9330640
FEC 933-0399
FEC 8731128
EVAL-AD5680
NOTES
Rev. 0 | Page 10 of 12
EVAL-AD5680
NOTES
Rev. 0 | Page 11 of 12
EVAL-AD5680
NOTES
©2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
EB06273-0-11/07(0)
Rev. 0 | Page 12 of 12