EVAL-AD5161DBZ User Guide
UG-624
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 the AD5161 Digital Potentiometer
FEATURES
GENERAL DESCRIPTION
Full featured evaluation board used in conjunction with
low voltage digiPOT motherboard (EVAL-MB-LV-SDZ)
Multiple test circuits
Multiple ac/dc input signals
PC control via a separately purchased system demonstration
platform (SDP-B or SDP-S)
PC software for control
This user guide describes the evaluation boards for evaluating the
AD5161, a 256-position SPI-/I2C-selectable digital potentiometer.
EVALUATION KIT CONTENTS
EVAL-AD5161DBZ evaluation board
EVAL-MB-LV-SDZ motherboard
CD that includes
Self-installing software that allows users to control the
board and exercise all functions of the device
Electronic version of the AD5161 data sheet
Electronic version of the EVAL-AD5161DBZ user guide
The AD5161 supports single-supply 2.7 V to 5.5 V operation,
making the device suitable for battery-powered applications and
many applications requiring superior low temperature coefficient
performance.
In addition, the AD5161 has a pin-selectable SPI- or I2Ccompatible digital interface, which can be used to control the
wiper settings or to read back the wiper register content. In SPI
mode, the device can be daisy-chained (SDO to SDI), allowing
several parts to share the same control lines. In I2C mode,
Address Pin AD0 can be used to place up to two devices on the
same bus. In this same mode, command bits are available to reset
the wiper position to midscale or to shut down the device into a
state of zero power consumption.
The EVAL-AD5161DBZ daughter board and the EVAL-MBLV-SDZ motherboard can operate in single-supply mode and
incorporate an internal power supply from the USB.
Complete specifications for the AD5161 can be found in the
AD5161 data sheet, which is available from www.analog.com
and should be consulted in conjunction with this user guide
when using the evaluation board.
11876-001
PHOTOGRAPH OF EVAL-AD5161DBZ WITH MOTHERBOARD AND SDP-B
Figure 1. Digital Picture of Evaluation Board with Low Voltage DigiPOT Motherboard and System Demonstration Platform
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 16
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EVAL-AD5161DBZ User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
Test Circuits ...................................................................................4
Evaluation Kit Contents ................................................................... 1
Evaluation Board Software ...............................................................6
General Description ......................................................................... 1
Installing the Software ..................................................................6
Photograph of EVAL-AD5161DBZ with Motherboard
and SDP-B .......................................................................................... 1
Running the Software ...................................................................6
Revision History ............................................................................... 2
Evaluation Board Schematics and Artwork ...................................8
Evaluation Board Hardware ............................................................ 3
Motherboard ..................................................................................8
Power Supplies .............................................................................. 3
Daughter Board .......................................................................... 12
Link Options ................................................................................. 3
Bill of Materials ............................................................................... 14
Operating the Software .................................................................7
Digital Interface ............................................................................ 3
REVISION HISTORY
12/13—Revision 0: Initial Version
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EVAL-AD5161DBZ User Guide
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EVALUATION BOARD HARDWARE
POWER SUPPLIES
LINK OPTIONS
The EVAL-MB-LV-SDZ supports using single power supplies.
Several link and switch options are incorporated on the EVALMB-LV-SDZ and EVAL-AD5161DBZ boards and must be set
up before using the evaluation system. The functions of these
link options are described in detail in Table 2 through Table 6.
By default, the evaluation system is set up to be controlled by a
PC via the SDP board.
The evaluation board can be powered either from the SDP port
or externally by the J1 and J2 connectors, as described in Table 1.
All supplies are decoupled to ground using 10 µF and 0.1 µF
ceramic capacitors.
DIGITAL INTERFACE
The EVAL-AD5161DBZ can be configured as an I2C or SPI
digital interface, depending on the position of the P9 jumper. If
the device is configured in I2C mode, the P10 jumper selects the
I2C address. See Table 3 for further details.
Table 1. Connector Functions
Connector No.
J1-1
J1-2
J2-1
J2-2
Label
VDD
AGND
VLOGIC
DGND
Description
Analog positive power supply, VDD
Analog ground
Digital supply
Digital ground
Voltage
Min
Max
2.7 V
5.5 V
2.7 V
VDD
Table 2. Link Functions
Link No.
A5
Power Supply
VLOGIC
A11
VDD
A12
GND
Options
Digital supply select options:
3.3 V (from the SDP board)
VLOGIC EXT (external supply from the J2 connector)
Positive power supply select options:
5 V (from the SDP board)
3.3 V (from the SDP board)
VDD (external supply from the J1 connector)
AGND
Default Position
3.3 V
3.3 V
AGND
Table 3. Digital Interface Link Functions
Link No.
P9
P10
Options
Digital interface select options:
SPI (use SPI digital interface).
I2C (use I2C digital interface).
Chip select options (I2C mode only):
Left side: address pin is connected to AGND.
Right side: address pin is connected to VLOGIC.
This jumper is unused in SPI mode.
Rev. 0 | Page 3 of 16
Default Position
SPI
Left
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EVAL-AD5161DBZ User Guide
TEST CIRCUITS
1kHz
The EVAL-AD5161DBZ and EVAL-MB-LV-SDZ incorporate
several test circuits to evaluate the performance of the AD5161.
VDD
2
HPF
AC+
AC
AC_INPUT
DAC
R34
The RDAC can be operated as a digital-to-analog converter
(DAC), as shown in Figure 2.
VDD
2
RDAC
A
A1
W1
W
AC+
VOUT1
BUF-W1
B
B1
VDD
VDD
RDAC
A
R35
A1
W1
W
BUF-W1
Table 4. AC Signal Attenuation Link Options
11876-002
AGND
Figure 2. DAC
Link
A9
Options
AC+
A10
AC
BIAS
AGND
Table 5 shows the options available for the voltage references.
The output voltage is defined in Equation 1.
VOUT = (VA − VB ) ×
AGND
Depending on the voltage supply rails and the dc offset voltage
of the ac signal, various configurations can be used, as described
in Table 4.
R35
BIAS
2
Figure 3. AC Signal Attenuator
B1
2
BIAS
VOUT1
B
VDD
VDD
11876-003
R34
RDAC
256
(1)
where:
RDAC is the code loaded in the RDAC register.
VA is the voltage applied to the A terminal (A9 link).
VB is the voltage applied to the B terminal (A10 link).
1
Conditions
No dc offset voltage.
AC signal is outside the voltage supply rails
due to the dc offset voltage.
DC offset voltage ≠ VDD/2.1
All other conditions.
Use in conjunction with AC+ link.1
All other conditions.
Recommended to ensure optimal total harmonic distortion (THD) performance.
The signal attenuation is defined in Equation 2.
However, by using the R34 and R35 external resistors, you can
reduce the voltage of the voltage references. In this case, use the
A1 and B1 test points to measure the voltage applied to the A and
B terminals and recalculate VA and VB in Equation 1.
AC Signal Attenuation
The RDAC can be used to attenuate an ac signal, which must be
provided externally using the AC_INPUT connector, as shown
in Figure 3.
R + RW
Attenuation (dB) = 20 × log WB
REND −TO −END
where:
RWB is the resistance between the W and B terminals.
RW is the wiper resistance.
REND-TO-END is the end-to-end resistance value.
Table 5. DAC Voltage References
Terminal
A1
W1
B1
Link Settings
Daughter Board
Motherboard
P5: A1 position
A9: AC+ position
A9: VDD position
P6: W1 position
BUF-W1: inserted
P7: B1 position
A10: BIAS position
A10: AGND position
P8: inserted
Description
Connects Terminal A1 to VDD/2
Connects Terminal A1 to VDD
Connects Terminal W1 to an output buffer
Connects Terminal B1 to VDD/2
Connects Terminal B1 to analog ground
Closes the feedback loop of the second op amp in the AD8618
Rev. 0 | Page 4 of 16
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EVAL-AD5161DBZ User Guide
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The RDAC can be operated as an inverting or noninverting
signal amplifier and can support linear or pseudologarithmic
gain. Table 6 shows the available configurations.
A2
R43
C1
10nF
B2
W
A
R42
B
RDAC
RWB
R38
(3)
R41
1.7kΩ
The inverting amplifier with linear gain is shown in Figure 6,
and the gain is defined in Equation 5.
VOUT2
R38
2.7kΩ
C1
10nF
W2
G=−
B2
B
R42
RDAC
(5)
where RWB is the resistor between the W and B terminals.
11876-004
W
RWB
R38
Note that the input signal, VIN, must be negative.
Figure 4. Noninverting Amplifier with Linear Gain
R41
1.7kΩ
The noninverting amplifier with pseudologarithmic gain is
shown in Figure 5, and the gain is defined in Equation 4.
RWB
R AW
VIN
(4)
VOUT2
R38
2.7kΩ
C1
10nF
W2
B2
W
where:
RWB is the resistance between the W and B terminals.
RAW is the resistance between the A and W terminals.
B
R42
RDAC
NOTES
1. THE INPUT SIGNAL, VIN, MUST BE NEGATIVE.
11876-006
VIN
Figure 5. Noninverting Amplifier with Pseudologarithmic Gain
R43 and R42 can be used to set the maximum and minimum
gain limits.
where RWB is the resistance between the W and B terminals.
G =1+
VOUT2
W2
The noninverting amplifier with linear gain is shown in Figure 4,
and the gain is defined in Equation 3.
G =1+
R41
1.7kΩ
VIN
11876-005
Signal Amplifier
Figure 6. Inverting Amplifier with Linear Gain
Table 6. Amplifier Selection Link Settings
Amplifier
Noninverting
Gain
Linear
Pseudologarithmic
Inverting
Linear
Daughter Board
P5: A2 position,
P6: W2 position,
P7: B2 position,
P8: not inserted
P5: A2 position,
P6: W2 position,
P7: B2 position,
P8: not inserted
P5: A2 position,
P6: W2 position,
P7: B2 position,
P8: not inserted
Rev. 0 | Page 5 of 16
Link Settings
Motherboard
A7: LIN position,
A6: N-INV position,
A8: N-INV position
VIN Range
0 V to VDD
A7: LOG position,
A6: N-INV position,
A8: N-INV position
0 V to VDD
A7: LIN position,
A6: INV position,
A8: INV position
−VDD to 0 V
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EVAL-AD5161DBZ User Guide
EVALUATION BOARD SOFTWARE
2.
INSTALLING THE SOFTWARE
The EVAL-AD5161DBZ kit includes evaluation board software
provided on a CD. The software is compatible with Windows® XP,
Windows Vista, and Windows 7 (both 32-bit and 64-bit versions).
Install the software before connecting the SDP board to the
USB port of the PC to ensure that the SDP board is recognized
when it is connected to the PC.
3.
4.
5.
Start the Windows operating system and insert the CD.
The installation software opens automatically. If it does
not, run the setup.exe file from the CD.
After the installation is complete, power up the evaluation
board as described in the Power Supplies section.
Connect the EVAL-AD5161DBZ and EVAL-MB-LV-SDZ to
the SDP board and the SDP board to the PC.
When the software detects the evaluation board, follow the
instructions that appear to finalize the installation.
11876-007
1.
2.
Figure 7. Pop-Up Window Error
RUNNING THE SOFTWARE
To run the program, do the following:
Click Start > All Programs > Analog Devices > AD5161
> AD5161 Eval Board. (To uninstall the program, click
Start > Control Panel > Add or Remove Programs >
AD5161 Eval Board.)
The main window of the EVAL-AD5161DBZ software then
opens, as shown in Figure 8.
11876-008
1.
If the SDP board is not connected to the USB port when
the software is launched, a connectivity error displays (see
Figure 7). If a connectivity error is displayed, connect the
evaluation board to the USB port of the PC and wait a few
seconds, and then click Rescan and follow the instructions
that appear on-screen.
Figure 8. EVAL-AD5161DBZ Software Main Window, Visual Control Tab
Rev. 0 | Page 6 of 16
EVAL-AD5161DBZ User Guide
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OPERATING THE SOFTWARE
Manual Control Tab
The main window of the EVAL-AD5161DBZ software is
divided into two tabs: Visual Control and Manual Control.
The Manual Control tab, as shown in Figure 9, allows customizing
an I2C or SPI data-word by manually switching each serial dataword from 0 to 1 or from 1 to 0, as desired, and then clicking
I2C Write or SPI Write/Read. Similarly, data can also be read
from either I2C or SPI using the corresponding controls.
Visual Control Tab
The I2C Data Written or SPI Data Written box shows the
value that is written to the evaluation board. It is set using the
sliders in the I2C – Write or SPI – Write / Read section.
Exiting the window closes the program.
11876-009
The Visual Control tab, as shown in Figure 8, contains a block
diagram that allows inputting data in hexadecimal format to be
written to or read from the device. To write data to the device, type
a hexadecimal value into the Data to write box and click Write.
To read data from the device, click Read; the data is displayed
in hexadecimal format in the Data read box. A slider control,
located on the right side of the window, allows changing the
wiper setting.
Figure 9. EVAL-AD5161DBZ Software Main Window, Manual Control Tab
Rev. 0 | Page 7 of 16
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EVAL-AD5161DBZ User Guide
EVALUATION BOARD SCHEMATICS AND ARTWORK
11876-010
MOTHERBOARD
Figure 10. SDP Connector and Power Supply
Rev. 0 | Page 8 of 16
EVAL-AD5161DBZ User Guide
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11876-011
Figure 11. Schematic of Test Circuits
Rev. 0 | Page 9 of 16
EVAL-AD5161DBZ User Guide
11876-012
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Figure 12. Schematic of Connectors to Daughter Board
Rev. 0 | Page 10 of 16
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11876-013
EVAL-AD5161DBZ User Guide
11876-014
Figure 13. Component Side View
11876-015
Figure 14. Component Placement Drawing
Figure 15. Layer 2 Side PCB Drawing
Rev. 0 | Page 11 of 16
DIS
13
15
11
16
SDI
1
SDA
3
SCLK
4
SCL
SYNC_N 9
ADDR0 8
12
SDO
ADDR0
VLOGIC
1
2
3
1
2
3
PAD
6 PAD
GND
DIS
VLOGIC
IN
EN_N
S4B
S4A
S3B
S3A
S2B
S2A
S1B
S1A
VDD
14
10
7
5
SDO_NC
SYNC_N_ADDR0
SCLK_SCL
M20-9990345
P10
M20-9990345
1-2 = SPI
2-3 = I2C
P9
PLEASE PUT LINKS TO
P5, P6, P7, AND P8
P9 AND P10
SDI_SDA
ADG774ABCPZ
D4
D3
D2
2
U2
D1
VLOGIC
1
2
3
1
2
3
1
2
3
M20-9990345
P7
M20-9990345
P6
M20-9990345
P5
B2
W2
1
2
69157-102
P8
OP AMP PROTECTION
B1
B
B2
W1
W
W2
A1
A
A2
CIRCUIT CONNECTION
1-2 = DAC + ATTENUATOR
2-3 = AMPLIFIER
7
4
P1
1
2
3
4
5
6
7
8
A
W
B
C1
0.1UF
P4
C2
10UF
C3
0.1UF
VDD
B2
W2
A2
B1
W1
A1
1
2
3
4
5
6
7
8
9
10
11
12
P2
SSW-106-01-T-D
B4
W4
A4
B3
W3
A3
INSERT P1, P2, P3, AND P4
ON THE SOLDER SIDE OF THE BOARD
VSS
VDD
TSW-105-08-G-S
TSW-105-08-G-S
P3
AD5161BRMZ10
W
1
10
2
B
U1
A
SDO/NC
GND
CS_N/AD0
DIS
CLK/SCL
SDI/SDA
VDD
9
ADDR0
ADDR1
SDA
SCL
SYNC_N
SDO
SDI
SCLK
5
SDI_SDA
SCLK_SCL 6
8
DIS
3
SYNC_N_ADDR0
SDO_NC
22-03-2081
VDD
RESET_N
WP_N
LRDAC_N
DIS
INDEP
1
2
3
4
5
VLOGIC
Rev. 0 | Page 12 of 16
1
2
3
4
5
Figure 16. Schematic of Daughter Board
VSS
VDD
C4
10UF
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EVAL-AD5161DBZ User Guide
DAUGHTER BOARD
11876-016
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11876-017
EVAL-AD5161DBZ User Guide
11876-018
Figure 17. Component Side View
11876-019
Figure 18. Component Placement Drawing
Figure 19. Layer 2 Side PCB Drawing
Rev. 0 | Page 13 of 16
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EVAL-AD5161DBZ User Guide
BILL OF MATERIALS
Table 7. Motherboard Bill of Materials
Qty
3
3
5
1
2
1
1
1
2
17
1
1
1
1
1
1
3
5
1
8
4
2
4
2
1
1
1
1
1
1
1
1
1
18
5
1
Reference Designator
BUF-3, BUF-4, BUF-W1
A6, A7, A8
A5, A9, A10, A11, A12
J1
J7, J8
J4
J10
J5
J2, J3
R1, R3, R6, R7, R8, R9, R10, R11, R12,
R13, R20, R22, R23, R34, R35, R42,
R43
R2
R41
R21
R38
R14
R4
R5, R25, R26
R15, R16, R17, R18, R19
C1
C4, C9, C10, C11, C12, C17, C19, C21
C2, C6, C7, C14
C8, C13
C18, C20, C22, C5
C3, C15
C16
C34
L2
D1
U1
U2
U3
U4
U5
LRDAC, RESET, SYNC, WP, A1, A2, A3,
A4, AGND, B1, VOUT_C1, VOUT_C2,
VOUT3, VOUT4, W1, W2, W3, W4
+3.3V, +5V, EXT_VDD, VLOGIC,
EXT_VSS
Description
2-pin (0.1" pitch) header and shorting shunt
3-pin SIL header and shorting link
6-pin (3 × 2), 0.1" header and shorting block
3-pin terminal block (5 mm pitch)
4-pin SIL header
Receptacle, 0.6 mm, 120-way
8-pin inline header; 100 mil centers
12-pin (2 × 6), 0.1" pitch header
2-pin terminal block (5 mm pitch)
SMD resistor, 0 Ω, 0.01, 0603
Supplier 1/Part Number
FEC 1022247 and FEC 150411
FEC 1022248 and FEC 150410
FEC 148535 and FEC 150411 (36-pin strip)
FEC 151790
FEC 1098035
Digi-Key H1219-ND
FEC 1098038
FEC 1098051
FEC 151789
FEC 9331662
SMD resistor, 2.2 kΩ, 0.01, 0603
SMD resistor, 1.7 kΩ, 1%, 0603
Resistor, surge, 1.6 Ω, 1%, 0603
SMD resistor, 2.7 kΩ, 1%, 0603
SMD resistor, 100 Ω, 1%, 0603
SMD resistor, 1 kΩ, 0.01, 0603
SMD resistor, 100 kΩ, 1%, 0603
SMD resistor, 33 kΩ, 1%, 0603
SMD capacitor, 100 nF, 10%, 0805
SMD capacitor, 0.1 µF, ±10%, 0603
SMD capacitor, 0.1 µF, ±10%, 0603
SMD capacitor, 10 µF, ±10%
Capacitor, 10 µF, ±20%
Capacitor, 470 nF, ±10%, 0603
Capacitor, 4.7 nF, ±10%, 0603
Capacitor, 4.7 nF, ±20%
Inductor, SMD, 600Z
Green SMD LED
Two-port level translating bus switch
Dual op amp
Precision low dropout voltage regulator
Operational amplifier
I2C serial EEPROM, 64k, 2.5 V, MSOP-8
Terminal, PCB, black, PK100, test point
FEC 1750676
FEC 1170811
FEC 1627674
FEC 1750678
FEC 9330364
FEC 9330380
FEC 9330402
FEC 9331034
FEC 1650863
FEC 1759122
FEC 3019482
FEC 197130
FEC 1190107
FEC 1414037
FEC 1414642
FEC 1432350
FEC 9526862
FEC 5790852
ADG3247BCPZ
AD8652ARZ
ADP3303ARZ-3.3
AD8618ARZ
FEC 1331335
FEC 8731128
Terminal, PCB, red, PK100
FEC 8731144
FEC refers to Farnell Electronic Component Distributors; Digi-Key refers to Digi-Key Corporation.
Rev. 0 | Page 14 of 16
EVAL-AD5161DBZ User Guide
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Table 8. Daughter Board Bill of Materials
Qty
1
1
1
5
2
2
1
1
2
1
Reference Designator
U1
U2
P8
P5, P6, P7, P9, P10
C2, C4
C1, C3
P1
P2
P3, P4
Description
256-position digital potentiometer
Quad 2:1 multiplexer
2-pin (0.1" pitch) header and shorting shunt
3-pin SIL header and shorting link
6.3 V, X5R, ceramic capacitor, 10 µF, ±20%
50 V, X7R, ceramic capacitor, 0.1 µF, ±10%
Header, 2.54 mm, PCB, 1 × 8-way
12-pin (2 × 6), 0.1" pitch header
5-pin SIL header
FEC refers to Farnell Electronic Component Distributors.
Rev. 0 | Page 15 of 16
Supplier 1/Part Number
AD5161BRMZ10
ADG774ABCPZ
FEC 1022247 and FEC 150411
FEC 1022248 and FEC 150410
GRM188R60J106ME47D
GRM188R71H104KA93D
FEC 1766172
FEC 1804099
FEC 1929016
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EVAL-AD5161DBZ User Guide
NOTES
I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).
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
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