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AD5161 - Analog Devices - 256-Position SPI/I2C Selectable Digital Potentiometer

Номер произв AD5161
Описание 256-Position SPI/I2C Selectable Digital Potentiometer
Производители Analog Devices
логотип Analog Devices логотип 
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AD5161 Даташит, Описание, Даташиты
Data Sheet
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/I2C 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, IDD = 8 µA
Wide operating temperature −40°C to +125°C
SDO output allows multiple device daisy-chaining
Evaluation board available
APPLICATIONS
Mechanical potentiometer replacement in new designs
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
Gain control and offset adjustment
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 I2C 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 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.
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.
256-Position SPI/I2C Selectable
Digital Potentiometer
AD5161
FUNCTIONAL BLOCK DIAGRAM
VDD SDO/NC
SDI/SDA
CLK/SCL
DIS
CS/AD0
SPI OR I2C
INTERFACE
A
W
WIPER
REGISTER
B
GND
Figure 1.
PIN CONFIGURATION
A1
10 W
B 2 AD5161 9 VDD
CS/ADO 3 TOP VIEW 8 DIS
SDO/NC 4 (Not to Scale) 7 GND
SDI/SDA 5
6 CLK/SCL
Figure 2.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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 ©2003–2012 Analog Devices, Inc. All rights reserved.
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AD5161 Даташит, Описание, Даташиты
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 Ratings1 .......................................................... 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Test Circuits..................................................................................... 12
REVISION HISTORY
8/12—Rev. A to Rev. B
Changes to Applications Section .................................................... 1
Updated Outline Dimensions ....................................................... 19
4/09—Rev. 0 to Rev. A
Changes to Ordering Guide .......................................................... 19
5/03—Revision 0: Initial Version
Data Sheet
SPI Interface .................................................................................... 13
I2C 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
Rev. B | Page 2 of 20
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AD5161 Даташит, Описание, Даташиты
Data Sheet
AD5161
ELECTRICAL CHARACTERISTICS—5 kΩ VERSION
VDD = 5 V ± 10%, or 3 V ± 10%; VA = +VDD; VB = 0 V; –40°C < TA < +125°C; unless otherwise noted.
Table 1.
Parameter
Symbol Conditions
DC CHARACTERISTICS—RHEOSTAT MODE
Resistor Differential Nonlinearity2
R-DNL
RWB, VA = no connect
Resistor Integral Nonlinearity2
R-INL
RWB, VA = no connect
Nominal Resistor Tolerance3
∆RAB
TA = 25°C
Resistance Temperature Coefficient
∆RAB/∆T VAB = VDD, Wiper = no connect
Wiper Resistance
RW
DC CHARACTERISTICS—POTENTIOMETER DIVIDER MODE (Specifications apply to all VRs)
Resolution
N
Differential Nonlinearity4
DNL
Integral Nonlinearity4
INL
Voltage Divider Temperature Coefficient
Full-Scale Error
Zero-Scale Error
RESISTOR TERMINALS
∆VW/∆T
VWFSE
VWZSE
Code = 0x80
Code = 0xFF
Code = 0x00
Voltage Range5
Capacitance6 A, B
VA,B,W
CA,B
f = 1 MHz, measured to GND,
Code = 0x80
Capacitance6 W
CW f = 1 MHz, measured to GND,
Code = 0x80
Shutdown Supply Current7
Common-Mode Leakage
DIGITAL INPUTS AND OUTPUTS
IDD_SD
ICM
VDD = 5.5 V
VA = VB = VDD/2
Input Logic High
Input Logic Low
Input Logic High
Input Logic Low
Input Current
Input Capacitance6
POWER SUPPLIES
VIH
VIL
VIH VDD = 3 V
VIL VDD = 3 V
IIL VIN = 0 V or 5 V
CIL
Power Supply Range
Supply Current
Power Dissipation8
Power Supply Sensitivity
VDD RANGE
IDD
PDISS
PSS
VIH = 5 V or VIL = 0 V
VIH = 5 V or VIL = 0 V, VDD = 5 V
∆VDD = +5 V ± 10%,
Code = Midscale
DYNAMIC CHARACTERISTICS6, 9
Bandwidth –3dB
Total Harmonic Distortion
VW Settling Time
Resistor Noise Voltage Density
BW_5K
THDW
tS
eN_WB
RAB = 5 kΩ, Code = 0x80
VA = 1 V rms, VB = 0 V, f = 1 kHz
VA= 5 V, VB= 0 V, ±1 LSB error band
RWB = 2.5 kΩ, RS = 0
Min
−1.5
–4
–30
–1.5
–1.5
–6
0
GND
2.4
2.1
2.7
Typ 1
±0.1
±0.75
45
50
±0.1
±0.6
15
–2.5
+2
45
60
0.01
1
5
3
±0.02
1.2
0.05
1
6
Max
+1.5
+4
+30
120
8
+1.5
+1.5
0
+6
VDD
1
0.8
0.6
±1
5.5
8
0.2
±0.05
Unit
LSB
LSB
%
ppm/°C
Bits
LSB
LSB
ppm/°C
LSB
LSB
V
pF
pF
µA
nA
V
V
V
V
µA
pF
V
µA
mW
%/%
MHz
%
µs
nV/√Hz
Rev. B | Page 3 of 20
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