AD5227BUJ10-RL7 ,64-Position Digital Up/Down Control PotentiometerFEATURES FUNCTIONAL BLOCK DIAGRAM V64-position digital potentiometer DD10 kΩ, 50 kΩ, 100 kΩ end-to- ..
AD5227BUJ50-RL7 ,64-Position Digital Up/Down Control PotentiometerGENERAL DESCRIPTION The AD5227 is Analog Devices’ latest 64-step up/down control The AD5227 is avai ..
AD5227BUJZ100-RL7 ,64-Position Digital Up/Down Control PotentiometerSpecifications subject to change without notice. No license is granted by implication www.analog.c ..
AD5227BUJZ10-R2 ,64-Position Digital Up/Down Control PotentiometerCharacteristics 7 Adjustable Current Source for LED Driver . 12 Theory of Operation ....... 10 Aut ..
AD5227BUJZ10-RL7 ,64-Position Digital Up/Down Control PotentiometerCHARACTERISTICS RHEOSTAT MODE 2Resistor Differential Nonlinearity R-DNL R , A = no connect ..
AD5227BUJZ50-RL7 ,64-Position Digital Up/Down Control PotentiometerApplications.... 12 Absolute Maximum Ratings...... 5 Manual Control with Toggle and Pushbutton Swit ..
AD8842ARZ ,8-Bit Octal, 4-Quadrant Multiplying, CMOS TrimDACSpecifications subject to change without notice.–2– REV. 0AD88421SDI A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 ..
AD890JP ,V(cc): +-7.5V; precision, wideband channel processing element. For high performance disk subsystem useSPECIFICATIONS (@ +2IPil and t5 y de, unless otherwise noted)
Parameter
Conditions
VARIABL ..
AD890JQ ,V(cc): +-7.5V; precision, wideband channel processing element. For high performance disk subsystem useSpecifications in boldface are tested on all production units at fiaal electrical test. Results fro ..
AD890JQ ,V(cc): +-7.5V; precision, wideband channel processing element. For high performance disk subsystem useFEATURES
An 80 MHz Bandwidth Permitting a so Mbls Data
Transfer Rate
A Variable Gain Amplifi ..
AD891JP ,RIGID DISK DATA CHANNEL QUALIFIERSPECIFICATIONS
Propagation Delay
20 mV Overdrive
200 mV Overdrive ns
Comparator Mismatch 30 ..
AD891JQ ,RIGID DISK DATA CHANNEL QUALIFIERSPECIFICATIONS
Propagation Delay3 Differentiator Input
to Data Output 6.8 ns
Additional Puls ..
AD5227BUJ100-RL7-AD5227BUJ10-RL7-AD5227BUJ50-RL7-AD5227BUJZ100-RL7-AD5227BUJZ10-R2-AD5227BUJZ10-RL7-AD5227BUJZ50-RL7
64-Position Digital Up/Down Control Potentiometer
64-Position Up/Down
Control Digital Potentiometer
Rev. 0
FEATURES
64-position digital potentiometer
10 kΩ, 50 kΩ, 100 kΩ end-to-end terminal resistance
Simple up/down digital or manual configurable control
Midscale preset
Low potentiometer mode tempco = 10 ppm/°C
Low rheostat mode tempco = 35 ppm/°C
Ultralow power, IDD = 0.4 µA typ and 3 µA max
Fast adjustment time, ts = 1 µs
Chip select enable multiple device operation
Low operating voltage, 2.7 V to 5.5 V
Automotive temperature range, −40°C to +105°C
Compact thin SOT-23-8 (2.9 mm × 3 mm) Pb-free package
APPLICATIONS
Mechanical potentiometer and trimmer replacements
LCD backlight, contrast, and brightness controls
Portable electronics level adjustment
Programmable power supply
Digital trimmer replacements
Automatic closed-loop control
FUNCTIONAL BLOCK DIAGRAM U/D
CLK
GND
VDD
Figure 1.
GENERAL DESCRIPTION The AD5227 is Analog Devices’ latest 64-step up/down control
digital potentiometer1. This device performs the same electronic
adjustment function as a 5 V potentiometer or variable resistor.
Its simple 3-wire up/down interface allows manual switching or
high speed digital control. The AD5227 presets to midscale at
power-up. When CS is enabled, the devices changes step at
every clock pulse. The direction is determined by the state of
the U/D pin (see Table 1). The interface is simple to activate by
any host controller, discrete logic, or manually with a rotary
encoder or pushbuttons. The AD5227’s 64-step resolution, small
footprint, and simple interface enable it to replace mechanical
potentiometers and trimmers with typically 6× improved
resolution, solid-state reliability, and design layout flexibility,
resulting in a considerable cost savings in end users’ systems.
1 The terms digital potentiometer and RDAC are used interchangeably.
The AD5227 is available in a compact thin SOT-23-8 (TSOT-8)
Pb-free package. The part is guaranteed to operate over the
automotive temperature range of −40°C to +105°C.
Users who consider EEMEM potentiometers should refer to
some recommendations in the Applications section.
Table 1. Truth Table RWA increments if RWB decrements and vice versa.
TABLE OF CONTENTS Electrical Characteristics.................................................................3
Interface Timing Diagrams.........................................................4
Absolute Maximum Ratings............................................................5
ESD Caution..................................................................................5
Pin Configuration and Function Descriptions.............................6
Typical Performance Characteristics.............................................7
Theory of Operation......................................................................10
Programming the Digital Potentiometers...............................10
Digital Interface..........................................................................11
Terminal Voltage Operation Range..........................................11
Power-Up and Power-Down Sequences..................................11
Layout and Power Supply Biasing............................................11
Applications.....................................................................................12
Manual Control with Toggle and Pushbutton Switches........12
Manual Control with Rotary Encoder.....................................12
Adjustable LED Driver..............................................................12
Adjustable Current Source for LED Driver............................12
Automatic LCD Panel Backlight Control................................13
6-Bit Controller..........................................................................13
Constant Bias with Supply to Retain Resistance Setting......14
Outline Dimensions.......................................................................15
Ordering Guide..........................................................................15
REVISION HISTORY Revision 0: Initial Version
ELECTRICAL CHARACTERISTICS 10 kΩ, 50 kΩ, 100 kΩ versions: VDD = 3 V ± 10% or 5 V ± 10%, VA = VDD, VB = 0 V, −40°C < TA < +105°C, unless otherwise noted.
Table 2. Footnotes on the next page.
1 Typicals represent average readings at 25°C, VDD = 5 V. 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. NL 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 = 0 V. DNL specification limits of ±1 LSB maximum are guaranteed monotonic operating conditions.
5 Resistor Terminals A, B, W have no limitations on polarity with respect to each other. Guaranteed by design and not subject to production test.
7 PDISS is calculated from (IDD × VDD). CMOS logic level inputs result in minimum power dissipation. Bandwidth, noise, and settling time are dependent on the terminal resistance value chosen. The lowest R value results in the fastest settling time and highest
bandwidth. The highest R value results in the minimum overall power consumption. All dynamic characteristics use VDD = V.
10 All input control voltages are specified with tR = tF = 1 ns (10% to 90% of VDD) and timed from a voltage level of 1.6 V. Switching characteristics are measured using
VDD = 5 V.
INTERFACE TIMING DIAGRAMS CS = LOW
U/D = HIGH
CLK
RWB
Figure 2. Increment RWB
CS = LOW
U/D = 0
CLK
RWB
Figure 3. Decrement RWB
CLK
U/D
RWB
ABSOLUTE MAXIMUM RATINGS
Table 3. 1 Maximum terminal current is bounded by the maximum applied voltage
across any two of the A, B, and W terminals at a given resistance, the
maximum current handling of the switches, and the maximum power
dissipation of the package. VDD = 5 V. Package power dissipation = (TJmax – TA) / θJA.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD 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 this product 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.
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS CLK
U/D
VDD
Figure 5. SOT-23-8 Pin Configuration
Table 4. Pin Function Descriptions TYPICAL PERFORMANCE CHARACTERISTICS
0645648403224168CODE (Decimal)
EOSTA
IN
L (
Figure 6. R-INL vs. Code vs. Temperature, VDD = 5 V
0645648403224168CODE (Decimal)
RHE
TAT MODE
DNL (LS
Figure 7. R-DNL vs. Code vs. Temperature, VDD = 5 V
0645648403224168CODE (Decimal)
NTIOME
R MODE
INL (LS
Figure 8. INL vs. Code, VDD = 5 V
0645648403224168CODE (Decimal)
NTIOME
R MODE
DNL (LS
Figure 9. DNL vs. Code vs. Temperature, VDD = 5 V
–40–20020406010080TEMPERATURE (°C)
FSE (
Figure 10. Full-Scale Error vs. Temperature
–40–20020406010080TEMPERATURE (°C)
ZSE (
Figure 11. Zero-Scale Error vs. Temperature
0.1–40–20020406010080TEMPERATURE (°C)
CURRE
NT (
Figure 12. Supply Current vs. Temperature
0.1–40–20020406010080TEMPERATURE (°C)
NOMINAL RE
ANCE
, R
(k
Figure 13. Nominal Resistance vs. Temperature
–40–20020406010080TEMPERATURE (°C)
WIP
RE
ANCE
, R
Figure 14. Wiper Resistance vs. Temperature
–10816243240485664CODE (Decimal)
RHEOSTAT MODE TEMPCO (ppm/
°C)
Figure 15. Rheostat Mode Tempco ∆RWB/∆T vs. Code
–10816243240485664CODE (Decimal)
NTIOME
R MODE
TEMPCO (ppm/
°C)
Figure 16. Potentiometer Mode Tempco ∆RWB/∆T vs. Code
–1210k1M
START 1 000.000HzSTOP 1 000 000.000Hz
REF LEVEL0dB6.0dBMAG (A/R)–8.957dB
100k04419-0-042
Figure 17. Gain vs. Frequency vs. Code, RAB = 10 kΩ
