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AD5170:  256-Position, Two-Time Programmable, I2C Compatible Digital Potentiometer

Product Details


The AD5170 is a 256-position, two-time programmable, digital potentiometer1 that employs fuse link technology, giving users two opportunities to permanently program the resistance setting. For users who do not need to program the digital potentiometer setting in memory more than once, the OTP feature is a cost-effective alternative to EEMEM. The AD5170 performs the same electronic adjustment function as mechanical potentiometers or variable resistors with enhanced resolution, solid-state reliability, and superior low temperature coefficient performance.

The AD5170 is programmed using a 2-wire, I2C®-compatible digital interface. Unlimited adjustments are allowed before permanently setting the resistance value, and there are two opportunities for permanent programming. During OTP activation, a permanent blow fuse command freezes the wiper position (analogous to placing epoxy on a mechanical trimmer).

Unlike traditional OTP digital potentiometers, the AD5170 has a unique temporary OTP overwrite feature that allows for new adjustments even after the fuse is blown. However, the OTP setting is restored during subsequent power-up conditions. This feature allows users to treat these digital potentiometers as volatile potentiometers with a programmable preset.

For applications that program the AD5170 at the factory, Analog Devices, Inc., offers device programming software that runs on Windows NT®, Windows® 2000, and Windows XP operating systems. This software effectively replaces any external I2C controllers, thus enhancing the time-to-market of the systems of the user.

Applications

  • Systems calibration
  • Electronics level setting
  • Mechanical trimmers replacement in new designs
  • Permanent factory PCB settings
  • Transducer adjustment of pressure, temperature, position, chemical, and optical sensors
  • RF amplifier biasing
  • Automotive electronics adjustments
  • Gain control and offset adjustments
  • * The terms digital potentiometer, VR, and RDAC are used interchangeably.

    Data Sheet, Rev. D, 7/08

    FEATURES and BENEFITS

    • 256-position digital potentiometer
    • Two-time programmable (TTP) set-and-forget resistance setting allows second-chance permanent programming
    • Unlimited adjustments prior to one-time programming (OTP) activation
    • OTP overwrite allows dynamic adjustments with user-defined preset
    • End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
    • Compact 10-Lead MSOP (3 mm × 4.9 mm) package
    • Fast settling time: tS = 5 μs typical in power-up
    • See Data Sheet for Additional Information

    Functional Block Diagram for AD5170

    Similar Products

    • AD5171: 64 Position OTP Digital Potentiometer
    • AD5172: 256-Position, One-Time Programmable, Dual Channel, I2C Digital Potentiometer
    • AD5173: 256-Position, One-Time Programmable, Dual Channel, I2C Digital Potentiometer
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    Documentation

    Title Content Type File Type
    AD5170: 256-Position Two-Time Programmable I2C Digital Potentiometer Data Sheet  (Rev G, 05/2011) (pdf, 914 kB) Data Sheets PDF
    AN-1291: Digital Potentiometers: Frequently Asked Questions  (pdf, 805 kB) Application Notes PDF
    AN-686: Implementing an I2C® Reset  (pdf, 44 kB) Application Notes PDF
    Choosing the Correct digiPOT for Your Application  (pdf, 431 kB) Design Handbooks PDF
    Understanding and Applying Digital Potentiometers
    In this webcast our experts will explain the differences between Pots and DigiPots and DACs, and present considerations for successful designs for many applications.
    Webcasts WEBCAST
    Choosing the Correct digiPOT for Your Application  (pdf, 431 kB) Overview PDF
    Is there a power up sequence I should follow? FAQs/RAQs HTML
    For dual supply digital potentiometers, if VDD/VSS are +2.5V/-2.5V respectively, can digital inputs be fed from a standard 3.3V CMOS logic component without logic level translation? What are the logic level thresholds when VDD is +2.5V and VSS is -2.5V? FAQs/RAQs HTML
    Is there a dependency between the logic level and power consumption? FAQs/RAQs HTML
    Is digital potentiometer a real replacement for mechanical potentiometer or are there restrictions regarding voltage potentials? FAQs/RAQs HTML
    Are all digital potentiometers limited to |5V|? FAQs/RAQs HTML
    Do digital potentiometers handle bipolar and AC operations? FAQs/RAQs HTML
    Can I achieve a 15V signal swing when using a 5V digital potentiometer? FAQs/RAQs HTML
    For digital potentiometers that do not have nonvolatile memory, what is the state during power up? FAQs/RAQs HTML
    Is there a particularly low-power digital potentiometer? FAQs/RAQs HTML
    Does the memory allow the device to return to the last stored value without an update from a micro? FAQs/RAQs HTML
    Will the data in the EEMEM need to be refreshed after 15 yrs when it is operated at 55°C? FAQs/RAQs HTML
    How many write cycles can the EEMEM go through before it fails? FAQs/RAQs HTML
    After the specified EEMEM data retention timeout period, can the power be turned off and back on so that the part is considered "refreshed"? FAQs/RAQs HTML
    Why are some digital potentiometers' maximum operating temperature only 85°C instead of the standard 125°C? FAQs/RAQs HTML
    How good is the resistance matching between Ch1 and Ch2 in the dual digital potentiometer? FAQs/RAQs HTML
    How is the resistance matching device to device? FAQs/RAQs HTML
    What is the resistance tolerance of the digital potentiometers? FAQs/RAQs HTML
    Can I cascade, serialize, or parallel multiple digital potentiometers to get the resistance or resolution I need? My requirement is for a 250 Ω digital potentiometer with approximately 1 Ω/step. I plan to use four 1 kΩ AD8403 in parallel with each set to nominally the same value. FAQs/RAQs HTML
    I would like to know how the digital potentiometer is built. How ideal are the wiper switches? FAQs/RAQs HTML
    What is the tempco of the digital potentiometer? FAQs/RAQs HTML
    What is the maximum current I can force into the digital potentiometer? FAQs/RAQs HTML
    Can a digitally controlled variable resistor withstand greater than 20mA? FAQs/RAQs HTML
    Can a digipot be used to construct a programmable high current source? FAQs/RAQs HTML
    If I use the digital potentiometer in a "dry" circuit (current through wiper < 1 pA), will it behave as a linear resistor in rheostat mode? FAQs/RAQs HTML
    Are ADI's digital potentiometers suitable for use in photodetector amplifiers and will they suffer from leakage currents which could affect the gain of the circuit? FAQs/RAQs HTML
    Regarding the spec on R-DNL, I am only concerned with relative adjustments. I'm not concerned with the actual value of the resistor in the digipot but need the digipot to be monotonic. FAQs/RAQs HTML
    Can I adjust the digital potentiometer for frequencies around 1MHz to 10MHz for adjusting the gain of a video signal? FAQs/RAQs HTML
    What is the maximum frequency that can be applied to the digital potentiometer CLK input? FAQs/RAQs HTML
    Is there crosstalk between Ch1 and Ch2 of a dual digital potentiometer such that a sine wave applied to Ch1 will occur in Ch2 as well? FAQs/RAQs HTML
    If I program Ch 1 from zero to full scale, will I expect Ch 2 to be disturbed? FAQs/RAQs HTML
    Digital Feedthrough FAQs/RAQs HTML
    How is the THD performance of digital potentiometer? FAQs/RAQs HTML
    If I use the digital potentiometer in audio volume control, will I experience zipper noise? FAQs/RAQs HTML
    For a digital potentiometer that requires 6-bit word length, what happens if I have 8-bit word length from my PC? FAQs/RAQs HTML
    For a digital potentiometer that requires 12-bit word length, how can I control with only 8-bit word length from my micro? FAQs/RAQs HTML
    Do you provide any software to control the digital potentiometers? FAQs/RAQs HTML
    How do I daisy-chain multiple potentiometers? How does the serial interface work for multiple AD8403's when there are still only two address bits? Are there multiple /CS lines, one for each individual chip? FAQs/RAQs HTML
    Can I program two channels of a multi-channel digital potentiometer at the same time? FAQs/RAQs HTML
    Can I read back the wiper setting of the digital potentiometers? FAQs/RAQs HTML
    Can I read back the contents of the two RDAC registers of AD5242 or AD5282 (dual I2C compatible digital potentiometer)? FAQs/RAQs HTML
    Is there a digital potentiometer controlled by a parallel input? FAQs/RAQs HTML
    Can digital potentiometers do log taper adjustment? FAQs/RAQs HTML
    I'm unsure about how to use pin 13 write protect (/WP), pin 14 preset (/PR), and pin 16 ready (RDY)? FAQs/RAQs HTML
    Why Should I replace mechanical potentiometers with digiPOT? FAQs/RAQs HTML
    What should I watch out for when I replace mechanical potentiometers with digital potentiometers? FAQs/RAQs HTML
    What is the ESD rating of digital potentiometers? FAQs/RAQs HTML
    How do I tell the end-to-end RAB resistance value? FAQs/RAQs HTML
    What are the common failure modes of digital potentiometers? FAQs/RAQs HTML
    Are there any evaluation boards for the digital potentiometers? FAQs/RAQs HTML
    Are PB-free digital potentiometers available? FAQs/RAQs HTML
    Can I use the new PB-free DigiPOTs in my traditional solder based PCB assembly process? FAQs/RAQs HTML
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    Level Shifting Digital Inputs from 3.3V to 5V or Vice Versa FAQs/RAQs HTML
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    Multiple I2C Slave Devices Addressing FAQs/RAQs HTML
    Resolution Enhancement FAQs/RAQs HTML
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    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    Digital Potentiometer Linux Driver Device Drivers HTML

    Evaluation Kits & Symbols & Footprints

    Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

    SampleSample & Buy

    Price, packaging, availability

    AD5170 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD5170BRM10 Status: Production 10 ld MSOP 10 Ind Tube, 50 $1.28 $1.16 N  Material Info PCN Purchase
    AD5170BRM10-RL7 Status: Production MICRO SOIC 8 Ind Reel, 1000 - $1.16 N  Material Info PCN Purchase
    AD5170BRM100 Status: Last Time Buy 10 ld MSOP 10 Ind Tube, 50 $1.28 $1.16 N  Material Info PCN/PDN Purchase
    AD5170BRM100-RL7 Status: Last Time Buy 10 ld MSOP 10 Ind Reel, 1000 - $1.16 N  Material Info PCN/PDN Purchase
    AD5170BRM2.5 Status: Last Time Buy 10 ld MSOP 10 Ind Tube, 50 $1.28 $1.16 N  Material Info PCN/PDN Purchase
    AD5170BRM2.5-RL7 Status: Last Time Buy 10 ld MSOP 10 Ind Reel, 1000 - $1.16 N  Material Info PCN/PDN Purchase
    AD5170BRM50 Status: Last Time Buy 10 ld MSOP 10 Ind Tube, 50 $1.28 $1.16 N  Material Info PCN/PDN Purchase
    AD5170BRM50-RL7 Status: Last Time Buy 10 ld MSOP 10 Ind Reel, 1000 - $1.16 N  Material Info PCN/PDN Purchase
    AD5170BRMZ10 Status: Production 10 ld MSOP 10 Ind Tube, 50 $1.11 $1.00 Y  Material Info PCN Purchase Sample
    AD5170BRMZ10-RL7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $1.00 Y  Material Info PCN Purchase
    AD5170BRMZ100 Status: Production 10 ld MSOP 10 Ind Tube, 50 $1.11 $1.00 Y  Material Info PCN Purchase Sample
    AD5170BRMZ100-RL7 Status: Last Time Buy MICRO SOIC 10 Ind Reel, 1000 - $1.00 Y  Material Info PDN Purchase
    AD5170BRMZ2.5 Status: Production 10 ld MSOP 10 Ind Tube, 50 $1.11 $1.00 Y  Material Info PCN Purchase Sample
    AD5170BRMZ2.5-RL7 Status: Production MICRO SOIC 10 Ind Reel, 1000 - $1.00 Y  Material Info Notify Me Purchase
    AD5170BRMZ50 Status: Production 10 ld MSOP 10 Ind Tube, 50 $1.11 $1.00 Y  Material Info PCN Purchase Sample
    AD5170BRMZ50-RL7 Status: Last Time Buy 10 ld MSOP 10 Ind Reel, 1000 - $1.00 Y  Material Info PDN Purchase
    Price Table Help

    The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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