Analog Devices EVAL-AD5161DBZ User manual

EVAL-AD5161DBZ User Guide
UG-624
One Technology Way •P. O . Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluation Board for the AD5161 Digital Potentiometer
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.Rev. 0 | Page 1 of 16
FEATURES
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
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-AD5161DBZuser guide
GENERAL DESCRIPTION
This user guide describes the evaluation boards for evaluating the
AD5161, a 256-position SPI-/I2C-selectable digital potentiometer.
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 I2C-
compatible 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 E VA L -AD5161DBZ daughter board and the E VA L -MB-
LV-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.
PHOTOGRAPH OF EVAL-AD5161DBZ WITH MOTHERBOARD AND SDP-B
11876-001
Figure 1. Digital Picture of Evaluation Board with Low Voltage DigiPOT Motherboard and System Demonstration Platform
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UG-624 EVAL-AD5161DBZ User Guide
Rev. 0 | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Kit Contents................................................................... 1
General Description ......................................................................... 1
Photograph of EVAL-AD5161DBZ with Motherboard
and SDP-B.......................................................................................... 1
Revision History ............................................................................... 2
Evaluation Board Hardware ............................................................ 3
Power Supplies .............................................................................. 3
Link Options ................................................................................. 3
Digital Interface ............................................................................ 3
Test Circuits ...................................................................................4
Evaluation Board Software...............................................................6
Installing the Software ..................................................................6
Running the Software ...................................................................6
Operating the Software.................................................................7
Evaluation Board Schematics and Artwork...................................8
Motherboard ..................................................................................8
Daughter Board .......................................................................... 12
Bill of Materials............................................................................... 14
REVISION HISTORY
12/13—Revision 0: Initial Version
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EVAL-AD5161DBZ User Guide UG-624
Rev. 0 | Page 3 of 16
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The EVAL-MB-LV-SDZ supports using single power supplies.
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.
LINK OPTIONS
Several link and switch options are incorporated on the EVAL-
MB-LV-SDZ and E VA L -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.
DIGITAL INTERFACE
The E VA L -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
Voltage
Connector No. Label Description Min Max
J1-1 VDD Analog positive power supply, VDD 2.7 V 5.5 V
J1-2 AGND Analog ground
J2-1 VLOGIC Digital supply 2.7 V VDD
J2-2 DGND Digital ground
Table 2. Link Functions
Link No.
Power Supply
Options
Default Position
A5
V
LOGIC
Digital supply select options:
3.3 V
3.3 V (from the SDP board)
VLOGIC EXT (external supply from the J2 connector)
A11 VDD Positive power supply select options: 3.3 V
5 V (from the SDP board)
3.3 V (from the SDP board)
VDD (external supply from the J1 connector)
A12
GND
AGND
AGND
Table 3. Digital Interface Link Functions
Link No. Options Default Position
P9 Digital interface select options: SPI
SPI (use SPI digital interface).
I2C (use I2C digital interface).
P10 Chip select options (I2C mode only): Left
Left side: address pin is connected to AGND.
Right side: address pin is connected to VLOGIC.
This jumper is unused in SPI mode.
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UG-624 EVAL-AD5161DBZ User Guide
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TEST CIRCUITS
The E VA L -AD5161DBZ and E VA L -MB-LV-SDZ incorporate
several test circuits to evaluate the performance of the AD5161.
DAC
The RDAC can be operated as a digital-to-analog converter
(DAC), as shown in Figure 2.
VOUT1
R34
R35
A1
W1
RDAC
A
BW
VDD
VDD
AC+
VDD
2
VDD
2AGND
BIAS
B1
BUF-W1
11876-002
Figure 2. DAC
Table 5 shows the options available for the voltage references.
The output voltage is defined in Equation 1.
256
)( RDAC VVV B
A
OUT ×−=
(1)
where:
RDAC is the code loaded in the RDAC register.
VAis the voltage applied to the A terminal (A9 link).
VBis the voltage applied to the B terminal (A10 link).
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 VAand VBin 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.
VOUT1
R34
R35
A1
W1
RDAC
A
BW
AC
AC+
AGND
BIAS
B1
BUF-W1
AC_INPUT
1kHz
HPF
V
DD
2
V
DD
2
11876-003
Figure 3. AC Signal Attenuator
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.
Table 4. AC Signal Attenuation Link Options
Link Options Conditions
A9 AC+ No dc offset voltage.
AC signal is outside the voltage supply rails
due to the dc offset voltage.
DC offset voltage ≠ VDD/2.1
AC All other conditions.
A10 BIAS Use in conjunction with AC+ link.1
AGND All other conditions.
1Recommended to ensure optimal total harmonic distortion (THD) performance.
The signal attenuation is defined in Equation 2.







+
×=
−− ENDTO
END
WWB
R
RR
nAttenuatio log20)dB(
(2)
where:
RWB is the resistance between the W and B terminals.
RWis the wiper resistance.
REND-TO-END is the end-to-end resistance value.
Table 5. DAC Voltage References
Link Settings
Terminal Daughter Board Motherboard Description
A1 P5: A1 position A9: AC+ position Connects Terminal A1 to VDD/2
A9: VDD position Connects Terminal A1 to VDD
W1 P6: W1 position BUF-W1: inserted Connects Terminal W1 to an output buffer
B1 P7: B1 position A10: BIAS position Connects Terminal B1 to VDD/2
A10: AGND position Connects Terminal B1 to analog ground
P8: inserted Closes the feedback loop of the second op amp in the AD8618
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EVAL-AD5161DBZ User Guide UG-624
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Signal Amplifier
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.
The noninverting amplifier with linear gain is shown in Figure 4,
and the gain is defined in Equation 3.
R38
R
G
WB
+
=1
(3)
where RWB is the resistance between the W and B terminals.
VOUT2
V
IN
RDAC
R42
C1
10nF
W2
B2
W B
R41
1.7kΩ
R38
2.7kΩ
11876-004
Figure 4. Noninverting Amplifier with Linear Gain
The noninverting amplifier with pseudologarithmic gain is
shown in Figure 5, and the gain is defined in Equation 4.
AW
WB
R
R
G+=1
(4)
where:
RWB is the resistance between the W and B terminals.
RAW is the resistance between the A and W terminals.
VOUT2
V
IN
RDAC
R42
C1
10nF
W2
B2
A B
W
R41
1.7kΩ
A2
R43
11876-005
Figure 5. Noninverting Amplifier with Pseudologarithmic Gain
R43 and R42 can be used to set the maximum and minimum
gain limits.
The inverting amplifier with linear gain is shown in Figure 6,
and the gain is defined in Equation 5.
R38
R
GWB −=
(5)
where RWB is the resistor between the W and B terminals.
Note that the input signal, VIN, must be negative.
11876-006
VOUT2
V
IN
RDAC
R42
C1
10nF
W2
B2
W B
R41
1.7kΩ
R38
2.7kΩ
NOTES
1. THE INPUT SIGNAL, V
IN
, MUST BE NEGATIVE.
Figure 6. Inverting Amplifier with Linear Gain
Table 6. Amplifier Selection Link Settings
Link Settings
Amplifier Gain Daughter Board Motherboard VIN Range
Noninverting Linear P5: A2 position, A7: LIN position, 0 V to VDD
P6: W2 position, A6: N-INV position,
P7: B2 position,
A8: N-INV position
P8: not inserted
Pseudologarithmic P5: A2 position, A7: LOG position, 0 V to VDD
P6: W2 position, A6: N-INV position,
P7: B2 position, A8: N-INV position
P8: not inserted
Inverting Linear P5: A2 position, A7: LIN position, −VDD to 0 V
P6: W2 position, A6: INV position,
P7: B2 position, A8: INV position
P8: not inserted
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UG-624 EVAL-AD5161DBZ User Guide
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EVALUATION BOARD SOFTWARE
INSTALLING THE SOFTWARE
The E VA L -AD5161DBZ kit includes evaluation board software
provided on a CD. The software is compatible with Windows® X P,
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.
1. Start the Windows operating system and insert the CD.
2. The installation software opens automatically. If it does
not, run the setup.exe file from the CD.
3. After the installation is complete, power up the evaluation
board as described in the Power Supplies section.
4. Connect the E VA L -AD5161DBZ and E VA L -MB-LV-SDZ to
the SDP board and the SDP board to the PC.
5. When the software detects the evaluation board, follow the
instructions that appear to finalize the installation.
RUNNING THE SOFTWARE
To run the program, do the following:
1. 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.)
2. 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.
11876-007
Figure 7. Pop-Up Window Error
The main window of the E VA L -AD5161DBZ software then
opens, as shown in Figure 8.
11876-008
Figure 8. EVAL-AD5161DBZ Software Main Window, Visual Control Tab
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EVAL-AD5161DBZ User Guide UG-624
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OPERATING THE SOFTWARE
The main window of the E VA L -AD5161DBZ software is
divided into two tabs: Visual Control and Manual Control.
Visual Control Tab
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 Wr ite .
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.
Manual Control Tab
The Manual Control tab, as shown in Figure 9, allows customizing
an I2C or SPI data-word by manually switching each serial data-
word 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.
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 – Wr ite or SPI – Write / Read section.
Exiting the window closes the program.
11876-009
Figure 9. EVAL-AD5161DBZ Software Main Window, Manual Control Tab
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UG-624 EVAL-AD5161DBZ User Guide
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EVALUATION BOARD SCHEMATICS AND ARTWORK
MOTHERBOARD
11876-010
Figure 10. SDP Connector and Power Supply
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EVAL-AD5161DBZ User Guide UG-624
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11876-011
Figure 11. Schematic of Test Circuits
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UG-624 EVAL-AD5161DBZ User Guide
Rev. 0 | Page 10 of 16
11876-012
Figure 12. Schematic of Connectors to Daughter Board
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EVAL-AD5161DBZ User Guide UG-624
Rev. 0 | Page 11 of 16
11876-013
Figure 13. Component Side View
11876-014
Figure 14. Component Placement Drawing
11876-015
Figure 15. Layer 2 Side PCB Drawing
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UG-624 EVAL-AD5161DBZ User Guide
Rev. 0 | Page 12 of 16
DAUGHTER BOARD
11876-016
CIRCUIT CONNECTION 1-2 = DAC + ATTENUATOR
P9 AND P10
P5, P6, P7, AND P8
2-3 = AMPLIFIER
2-3 = I2C 1-2 = SPI
PLEASE PUT LINKS TO
OP AMP PROTECTION
U2
SDO_NC
A
VLOGIC
VLOGIC
M20-9990345
ADDR0
DIS
VLOGIC
SDI SCLK SDO SDA SCL ADDR0
M20-9990345
SDI_SDA
DIS
SCLK_SCL
SYNC_N
M20-9990345
W1 W A1 B1 B B2 A2
P5
1 2 3
P6
1 2 3
P8
1 2
2 5 7 10
13
6
15
PAD
16
1 3 4 9 8
12 11
14
P9
1 2 3
P10
1 2 3
SYNC_N_ADDR0
W2
M20-9990345
3
B2
2
M20-9990345 P7
W2
69157-102
1
ADG774ABCPZ
PAD
S1A IN
VDD
EN_N S4A S4B D4 S3A S3B D3
GND
D2
S2B S2A
D1
S1B
7
AD5161BRMZ10
9
SDI_SDA SCLK_SCL
3
C2
6W
1
VSS
0.1UF
VDD VDD
0.1UF 10UF
SYNC_N_ADDR0
A B
VDD
DIS
C3 C4
2
8 5
4
10
U1
SDO_NC
C1 10UF
GND
SDO/NCVDD
B
W
A
CS_N/AD0 DIS CLK/SCL SDI/SDA
ON THE SOLDER SIDE OF THE BOARD INSERT P1, P2, P3, AND P4
P2
ADDR1 SYNC_N SCLK SDO
LRDAC_N
DIS
SDI
1 4 5 6 7 8
1
3
1
2
3
4
5
SDA
VLOGIC
VSS
VDD
P4
2
22-03-2081
2 3
SCL
SSW-106-01-T-D
1 2 3 4 5 6 7 9
10 11 12
A3 A1 W3 W1 B3 B1 A4 A2 W4 B4 B2
TSW-105-08-G-S
P3
INDEP
ADDR0
P1
RESET_N
WP_N
4
5
8
W2
TSW-105-08-G-S
Figure 16. Schematic of Daughter Board
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EVAL-AD5161DBZ User Guide UG-624
Rev. 0 | Page 13 of 16
11876-017
Figure 17. Component Side View
11876-018
Figure 18. Component Placement Drawing
11876-019
Figure 19. Layer 2 Side PCB Drawing
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UG-624 EVAL-AD5161DBZ User Guide
Rev. 0 | Page 14 of 16
BILL OF MATERIALS
Table 7. Motherboard Bill of Materials
Qty Reference Designator Description Supplier1/Part Number
3 BUF-3, BUF-4, BUF-W1 2-pin (0.1" pitch) header and shorting shunt FEC 1022247 and FEC 150411
3 A6, A7, A8 3-pin SIL header and shorting link FEC 1022248 and FEC 150410
5 A5, A9, A10, A11, A12 6-pin (3 × 2), 0.1" header and shorting block FEC 148535 and FEC 150411 (36-pin strip)
1 J1 3-pin terminal block (5 mm pitch) FEC 151790
2 J7, J8 4-pin SIL header FEC 1098035
1 J4 Receptacle, 0.6 mm, 120-way Digi-Key H1219-ND
1 J10 8-pin inline header; 100 mil centers FEC 1098038
1
J5
12-pin (2 × 6), 0.1" pitch header
FEC 1098051
2 J2, J3 2-pin terminal block (5 mm pitch) FEC 151789
17 R1, R3, R6, R7, R8, R9, R10, R11, R12,
R13, R20, R22, R23, R34, R35, R42,
R43
SMD resistor, 0 Ω, 0.01, 0603 FEC 9331662
1 R2 SMD resistor, 2.2 kΩ, 0.01, 0603 FEC 1750676
1 R41 SMD resistor, 1.7 kΩ, 1%, 0603 FEC 1170811
1 R21 Resistor, surge, 1.6 Ω, 1%, 0603 FEC 1627674
1 R38 SMD resistor, 2.7 kΩ, 1%, 0603 FEC 1750678
1 R14 SMD resistor, 100 Ω, 1%, 0603 FEC 9330364
1 R4 SMD resistor, 1 kΩ, 0.01, 0603 FEC 9330380
3
R5, R25, R26
SMD resistor, 100 kΩ, 1%, 0603
FEC 9330402
5 R15, R16, R17, R18, R19 SMD resistor, 33 kΩ, 1%, 0603 FEC 9331034
1 C1 SMD capacitor, 100 nF, 10%, 0805 FEC 1650863
8 C4, C9, C10, C11, C12, C17, C19, C21 SMD capacitor, 0.1 µF, ±10%, 0603 FEC 1759122
4 C2, C6, C7, C14 SMD capacitor, 0.1 µF, ±10%, 0603 FEC 3019482
2 C8, C13 SMD capacitor, 10 µF, ±10% FEC 197130
4 C18, C20, C22, C5 Capacitor, 10 µF, ±20% FEC 1190107
2 C3, C15 Capacitor, 470 nF, ±10%, 0603 FEC 1414037
1 C16 Capacitor, 4.7 nF, ±10%, 0603 FEC 1414642
1 C34 Capacitor, 4.7 nF, ±20% FEC 1432350
1 L2 Inductor, SMD, 600Z FEC 9526862
1
D1
Green SMD LED
FEC 5790852
1 U1 Two-port level translating bus switch ADG3247BCPZ
1 U2 Dual op amp AD8652ARZ
1 U3 Precision low dropout voltage regulator ADP3303ARZ-3.3
1 U4 Operational amplifier AD8618ARZ
1 U5 I2C serial EEPROM, 64k, 2.5 V, MSOP-8 FEC 1331335
18 LRDAC, RESET, SYNC, WP, A1, A2, A3,
A4, AGND, B1, VOUT_C1, VOUT_C2,
VOUT3, VOUT4, W1, W2, W3, W4
Terminal, PCB, black, PK100, test point FEC 8731128
5 +3.3V, +5V, EXT_VDD, VLOGIC,
EXT_VSS
Terminal, PCB, red, PK100 FEC 8731144
1FEC refers to Farnell Electronic Component Distributors; Digi-Key refers to Digi-Key Corporation.
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EVAL-AD5161DBZ User Guide UG-624
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Table 8. Daughter Board Bill of Materials
Qty Reference Designator Description Supplier1/Part Number
1 U1 256-position digital potentiometer AD5161BRMZ10
1 U2 Quad 2:1 multiplexer ADG774ABCPZ
1 P8 2-pin (0.1" pitch) header and shorting shunt FEC 1022247 and FEC 150411
5 P5, P6, P7, P9, P10 3-pin SIL header and shorting link FEC 1022248 and FEC 150410
2 C2, C4 6.3 V, X5R, ceramic capacitor, 10 µF, ±20% GRM188R60J106ME47D
2 C1, C3 50 V, X7R, ceramic capacitor, 0.1 µF, ±10% GRM188R71H104KA93D
1 P1 Header, 2.54 mm, PCB, 1 × 8-way FEC 1766172
1 P2 12-pin (2 × 6), 0.1" pitch header FEC 1804099
2 P3, P4 5-pin SIL header FEC 1929016
1FEC refers to Farnell Electronic Component Distributors.
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UG-624 EVAL-AD5161DBZ User Guide
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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 Ag
reement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
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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
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