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AD5161BRM50
256-Position SPI/I2C Selectable Digital Potentiometer
PRELIMINARY TECHNICAL DATA a 256-Position SPI/I
2C Selectable Digital Potentiometer FEATURES •
256 Position •
End-to-End Resistance 5k, 10k, 50k, 100kΩ •
Compact uSOIC-10 (3 x 4.9mm) Package •
Pin Selectable I2C or SPI Compatible Interface •
Extra Package address decode pin A0 •
Full Read/write of wiper register •
Power ON Reset to Midscale •
Single Supply +2.7V to +5.5V •
Low Temperature Coefficient 35ppm/°C •
Low power, IDD=5µA •
Wide Operating Temperature –40°C to +125°C
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 GENERAL DESCRIPTION The AD5161 provides a compact 3x4.9mm packaged solution for 256 position adjustment applications. This
device performs the same electronic adjustment function as a mechanical potentiometer or a variable
resistor. Available in four different end-to-end resistance values (5k, 10k, 50k, 100kΩ) these low
temperature coefficient devices are ideal for high accuracy and stability variable resistance
adjustments. The wiper settings are controllable through a pin
selectable SPI or I2C compatible digital interface, which can also be used to read back the present
wiper register control word. When the SPI mode is used the device can be daisy-chained (SDO to SDI)
allowing several parts to share the three micro controller lines. A command bit is available to reset
the wiper position to center value, and another
Notes:
1. The terms digital potentiometers, VR, and RDAC are used
interchangeably.
command bit causes the wiper to be positioned into
shutdown mode. Operating from a 2.7 to 5.5 volt power supply
consuming less than 5uA allows for usage in portable battery operated applications.
FUNCTIONAL DIAGRAM DD
CS/A0
SDI/SDA
CLK/SCL
GND
SDO/NC
I2C/SPI
PIN CONFIGURATION REV PrB, 13 DEC’02
PRELIMINARY TECHNICAL DATA 256 Position Digital PotentiometerAD5161
AD5161 ELECTRICAL CHARACTERISTICS 5K, 10K, 50K, 100KΩ VERSION (VDD = +5V ± 10%, or +3V ± 10%, VA = +VDD, VB = 0V, -40°C < TA < +125°C unless otherwise noted.)
Parameter Symbol Conditions Min Typ1 Max Units PRELIMINARY TECHNICAL DATA 256 Position Digital PotentiometerAD5161
AD5161 ELECTRICAL CHARACTERISTICS 5K, 10K, 50K, 100KΩ VERSION (VDD = +5V ± 10%, or +3V ± 10%, VA = +VDD, VB = 0V, -40°C < TA < +125°C unless otherwise noted.)
Parameter Symbol Conditions Min Typ1 Max Units NOTES:
1. Typicals represent average readings at +25°C and VDD = +5V. 2. Resistor position nonlinearity error R-INL is the deviation from an ideal value measured between the maximum resistance and the minimum resistance wiper positions. R-DNL measures the relative step change from ideal between successive tap positions. Parts are guaranteed monotonic. 3. VAB = VDD, Wiper (VW) = No connect 4. INL and DNL are measured at VW with the RDAC configured as a potentiometer divider similar to a voltage output D/A converter. VA = VDD and VB = 0V. DNL specification limits of ±1LSB maximum are Guaranteed Monotonic operating conditions. 5. Resistor terminals A,B,W have no limitations on polarity with respect to each other. 6. Guaranteed by design and not subject to production test. 7. Measured at the A terminal. A terminal is open circuited in shutdown mode. 8. PDISS is calculated from (IDD x VDD). CMOS logic level inputs result in minimum power dissipation
9. All dynamic characteristics use VDD = +5V. 10. See timing diagram for location of measured values. All input control voltages are specified with tR=tF=2ns(10% to 90% of +3V) and timed from a voltage level of 1.5V. Switching characteristics
are measured using VLOGIC = +5V. 11. The AD5161 contains 2532 transistors. Die Size: 30.7mil x 76.8 mil, 2358sq. mil. 12. See timing diagram for location of measured values.
CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
AD5161 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
PRELIMINARY TECHNICAL DATA 256 Position Digital PotentiometerAD5161
ABSOLUTE MAXIMUM RATINGS1 (TA = +25°C, unless
otherwise noted) VDD to GND......................................................-0.3, +7V
VA, VB, VW to GND...................................................VDD
IMAX.....................................................................±20mA2
Digital Inputs & Output Voltage to GND..............0V, +7V
Operating Temperature Range..............-40°C to +125°C Maximum Junction Temperature (TJ MAX)..............+150°C
Storage Temperature.............................-65°C to +150°C
Lead Temperature (Soldering, 10 sec)................+300°C
Thermal Resistance3 θJA,
µSOIC-10...............................................200°C/W
NOTES 1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2. Maximum terminal current is bounded by the maximum current handling of the switches, maximum power dissipation of the package, and maximum applied voltage across any two of the A, B, and W terminals at a given resistance
3. Package Power Dissipation (TJMAX-TA)/ θJA
ORDERING GUIDE PRELIMINARY TECHNICAL DATA 256 Position Digital PotentiometerAD5161
SPI Interface
TABLE 1: AD5161 Serial-Data Word Format
B7 B6 B5 B4 B3 B2 B1 B0 SDI
CLK
VOUTFigure 1A. AD5161 Timing Diagram(VA = 5V, VB = 0V, VW =
VOUT)
tCSH0
tCSS
tCH
tCL
tDStDH
tCSH1
tCSW
±1LSB
SDI
(DataIn)0
VDD
CLK
VOUTDx
tCS1
Figure 1B. Detail Timing Diagram(VA = 5V, VB = 0V, VW = VOUT)
PRELIMINARY TECHNICAL DATA 256 Position Digital PotentiometerAD51612C Interface
Write Mode:
Read Mode:
S = Start Condition
P = Stop Condition A = Acknowledge X = Don’t Care
W = Write R = Read
RS = Reset wiper to Midscale 80H
SD = Shutdown connects wiper to B terminal and open circuits A terminal. It does not change contents of wiper register. D7,D6,D5,D4,D3,D2,D1,D0 = Data Bits
SDA
SCL P 1 3 t58 10
Figure 2. Detail Timing Diagram
Figure 2. Writing to the RDAC Register
Figure 3. Reading Data from a Previously Selected RDAC Register in Write Mode
