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256-Position SPI/I
2
C Selectable
Digital Potentiometer
AD5161
FEATURES
256-position
End-to-end resistance 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Compact MSOP-10 (3 mm × 4.9 mm) package
Pin selectable SPI/I
2
C compatible interface
Extra package address decode pin AD0
Full read/write of wiper register
Power-on preset to midscale
Single supply 2.7 V to 5.5 V
Low temperature coefficient 45 ppm/°C
Low power, I
DD
= 8 μA
Wide operating temperature −40°C to +125°C
SDO output allows multiple device daisy-chaining
Evaluation board available
FUNCTIONAL BLOCK DIAGRAM
V
DD
SDI/SDA
A
CLK/SCL
DIS
CS/AD0
SPI OR
INTERFACE
W
I
2
C
SDO/NC
WIPER
REGISTER
B
GND
Figure 1.
APPLICATIONS
Mechanical potentiometer replacement in new designs
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
PIN CONFIGURATION
A 1
B 2
CS/ADO 3
SDI/SDA 5
10 W
AD5161
TOP VIEW
SDO/NC 4 (Not to Scale) 7 GND
6 CLK/SCL
9 VDD
8 DIS
Figure 2.
GENERAL DESCRIPTION
The AD5161 provides a compact 3 mm × 4.9 mm packaged
solution for 256-position adjustment applications. These
devices perform the same electronic adjustment function as
mechanical potentiometers or variable resistors, with enhanced
resolution, solid-state reliability, and superior low temperature
coefficient performance.
The wiper settings are controllable through a pin selectable SPI
or I
2
C compatible digital interface, which can also be used to
read back the wiper register content. When the SPI mode is
used, the device can be daisy-chained (SDO to SDI), allowing
several parts to share the same control lines. In the I
2
C 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.
Operating from a 2.7 V to 5.5 V power supply and consuming
less than 5 μA allows for usage in portable battery-operated
applications.
Rev. A
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
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 ©2003–2009 Analog Devices, Inc. All rights reserved.
AD5161
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Pin Configuration ............................................................................. 1
Revision History ............................................................................... 2
Electrical Characteristics—5 kΩ Version ...................................... 3
Electrical Characteristics—10 kΩ, 50 kΩ, 100 kΩ Versions....... 4
Timing Characteristics—5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ Versions 5
Absolute Maximum Ratings .......................................................... 6
ESD Caution .................................................................................. 6
Pin Configuration and Function Descriptions ............................. 7
Typical Performance Characteristics ............................................. 8
Test Circuits ..................................................................................... 12
SPI Interface .................................................................................... 13
I
2
C Interface .................................................................................... 14
Theory of Operation ...................................................................... 15
Programming the Variable Resistor ......................................... 15
Programming the Potentiometer Divider ............................... 16
Pin Selectable Digital Interface................................................. 16
Level Shifting for Bidirectional Interface ................................ 18
ESD Protection ........................................................................... 18
Terminal Voltage Operating Range ......................................... 18
Power-Up Sequence ................................................................... 18
Layout and Power Supply Bypassing ....................................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 19
REVISION HISTORY
4/09—Rev. 0 to Rev. A
Changes to Ordering Guide .......................................................... 19
5/03—Revision 0: Initial Version
Rev. A | Page 2 of 20
AD5161
ELECTRICAL CHARACTERISTICS—5 kΩ VERSION
V
DD
= 5 V ± 10%, or 3 V ± 10%; V
A
= +V
DD
; V
B
= 0 V; –40°C < T
A
< +125°C; unless otherwise noted.
Table 1.
Parameter
Symbol
Conditions
DC CHARACTERISTICS—RHEOSTAT MODE
Resistor Differential Nonlinearity
2
R-DNL
R
WB
, V
A
= no connect
Resistor Integral Nonlinearity
2
R-INL
R
WB
, V
A
= no connect
3
Nominal Resistor Tolerance
∆R
AB
T
A
= 25°C
Resistance Temperature Coefficient
∆R
AB
/∆T
V
AB
= V
DD
, Wiper = no connect
Wiper Resistance
R
W
DC CHARACTERISTICS—POTENTIOMETER DIVIDER MODE (Specifications apply to all VRs)
Resolution
N
4
Differential Nonlinearity
DNL
4
Integral Nonlinearity
INL
Voltage Divider Temperature Coefficient
∆V
W
/∆T
Code = 0x80
Full-Scale Error
V
WFSE
Code = 0xFF
Zero-Scale Error
V
WZSE
Code = 0x00
RESISTOR TERMINALS
Voltage Range
5
V
A,B,W
6
Capacitance A, B
C
A,B
f = 1 MHz, measured to GND,
Code = 0x80
6
Capacitance W
C
W
f = 1 MHz, measured to GND,
Code = 0x80
Shutdown Supply Current
7
I
DD_SD
V
DD
= 5.5 V
Common-Mode Leakage
I
CM
V
A
= V
B
= V
DD
/2
DIGITAL INPUTS AND OUTPUTS
Input Logic High
V
IH
Input Logic Low
V
IL
Input Logic High
V
IH
V
DD
= 3 V
Input Logic Low
V
IL
V
DD
= 3 V
Input Current
I
IL
V
IN
= 0 V or 5 V
Input Capacitance
6
C
IL
POWER SUPPLIES
Power Supply Range
V
DD RANGE
Supply Current
I
DD
V
IH
= 5 V or V
IL
= 0 V
Power Dissipation
8
P
DISS
V
IH
= 5 V or V
IL
= 0 V, V
DD
= 5 V
Power Supply Sensitivity
PSS
∆V
DD
= +5 V ± 10%,
Code = Midscale
DYNAMIC CHARACTERISTICS
6, 9
Bandwidth –3dB
BW_5K
R
AB
= 5 kΩ, Code = 0x80
Total Harmonic Distortion
THD
W
V
A
= 1 V rms, V
B
= 0 V, f = 1 kHz
V
W
Settling Time
t
S
V
A
= 5 V, V
B
= 0 V, ±1 LSB error band
Resistor Noise Voltage Density
e
N_WB
R
WB
= 2.5 kΩ, RS = 0
Min
−1.5
–4
–30
Typ
1
±0.1
±0.75
45
50
Max
+1.5
+4
+30
120
8
+1.5
+1.5
0
+6
V
DD
45
60
0.01
1
2.4
0.8
2.1
0.6
±1
5
2.7
3
±0.02
5.5
8
0.2
±0.05
1
Unit
LSB
LSB
%
ppm/°C
Ω
Bits
LSB
LSB
ppm/°C
LSB
LSB
V
pF
pF
μA
nA
V
V
V
V
μA
pF
V
μA
mW
%/%
–1.5
–1.5
–6
0
GND
±0.1
±0.6
15
–2.5
+2
1.2
0.05
1
6
MHz
%
μs
nV/√Hz
Rev. A | Page 3 of 20
AD5161
ELECTRICAL CHARACTERISTICS—10 kΩ, 50 kΩ, 100 kΩ VERSIONS
V
DD
= 5 V ± 10%, or 3 V ± 10%; V
A
= V
DD
; V
B
= 0 V; –40°C < T
A
< +125°C; unless otherwise noted.
Table 2.
Parameter
DC CHARACTERISTICS—RHEOSTAT MODE
Resistor Differential Nonlinearity
2
Resistor Integral Nonlinearity
2
Nominal Resistor Tolerance
3
Resistance Temperature Coefficient
Symbol
R-DNL
R-INL
∆R
AB
∆R
AB
/∆T
Conditions
Min
–1
–2
–30
Typ
1
±0.1
±0.25
45
50
120
8
+1
+1
0
3
V
DD
45
60
0.01
1
2.4
0.8
2.1
0.6
±1
5
2.7
3
5.5
8
0.2
±0.05
1
Max
+1
+2
+30
Unit
LSB
LSB
%
ppm/°C
Ω
Bits
LSB
LSB
ppm/°C
LSB
LSB
V
pF
pF
μA
nA
V
V
V
V
μA
pF
V
μA
mW
%/%
R
WB
, V
A
= no connect
R
WB
, V
A
= no connect
T
A
= 25°C
V
AB
= V
DD
,
Wiper = no connect
Wiper Resistance
R
W
V
DD
= 5 V
DC CHARACTERISTICS—POTENTIOMETER DIVIDER MODE (Specifications apply to all VRs)
Resolution
N
4
Differential Nonlinearity
DNL
4
Integral Nonlinearity
INL
Voltage Divider Temperature Coefficient
∆V
W
/∆T
Code = 0x80
Full-Scale Error
V
WFSE
Code = 0xFF
Zero-Scale Error
V
WZSE
Code = 0x00
RESISTOR TERMINALS
Voltage Range
5
V
A,B,W
Capacitance
6
A, B
C
A,B
f = 1 MHz, measured to
GND, Code = 0x80
6
Capacitance W
C
W
f = 1 MHz, measured to
GND, Code = 0x80
7
Shutdown Supply Current
I
DD_SD
V
DD
= 5.5 V
Common-Mode Leakage
I
CM
V
A
= V
B
= V
DD
/2
DIGITAL INPUTS AND OUTPUTS
Input Logic High
V
IH
Input Logic Low
V
IL
Input Logic High
V
IH
V
DD
= 3 V
Input Logic Low
V
IL
V
DD
= 3 V
Input Current
I
IL
V
IN
= 0 V or 5 V
6
Input Capacitance
C
IL
POWER SUPPLIES
Power Supply Range
V
DD RANGE
Supply Current
I
DD
V
IH
= 5 V or V
IL
= 0 V
8
Power Dissipation
P
DISS
V
IH
= 5 V or V
IL
= 0 V,
V
DD
= 5 V
Power Supply Sensitivity
PSS
∆V
DD
= +5 V ± 10%,
Code = Midscale
6, 9
DYNAMIC CHARACTERISTICS
Bandwidth –3dB
BW
R
AB
= 10 kΩ/50 kΩ/100 kΩ,
Code = 0x80
Total Harmonic Distortion
THD
W
V
A
=1 V rms, V
B
= 0 V,
f = 1 kHz, R
AB
= 10 kΩ
V
W
Settling Time (10 kΩ/50 kΩ/100 kΩ)
t
S
V
A
= 5 V, V
B
= 0 V,
±1 LSB error band
Resistor Noise Voltage Density
e
N_WB
R
WB
= 5 kΩ, RS = 0
–1
–1
–3
0
GND
±0.1
±0.3
15
–1
1
±0.02
600/100/40
0.05
2
9
kHz
%
μs
nV/√Hz
Rev. A | Page 4 of 20
Embedded System
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