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ADN2850:  Nonvolatile Memory, Dual 1024-Position Digital Resistor

Product Details


The ADN2850 is a dual-channel, nonvolatile memory1, digitally controlled resistors2 with 1024-step resolution, offering guaranteed maximum low resistor tolerance error of ±8%. The device performs the same electronic adjustment function as a mechanical rheostat with enhanced resolution, solid state reliability, and superior low temperature coefficient performance. The versatile programming of the ADN2850 via an SPI®-compatible serial interface allows 16 modes of operation and adjustment including scratchpad programming, memory storing and restoring, increment/decrement, ±6 dB/step log taper adjustment, wiper setting readback, and extra EEMEM1 for user-defined information such as memory data for other components, look-up table, or system identification information.

In the scratchpad programming mode, a specific setting can be programmed directly to the RDAC2 register, which sets the resistance between Terminal W and Terminal B. This setting can be stored into the EEMEM and is restored automatically to the RDAC register during system power-on.

The EEMEM content can be restored dynamically or through external PR strobing, and a WP function protects EEMEM contents. To simplify the programming, the independent or simultaneous linear-step increment or decrement commands can be used to move the RDAC wiper up or down, one step at a time. For logarithmic ±6 dB changes in the wiper setting, the left or right bit shift command can be used to double or halve the RDAC wiper setting.

The ADN2850 patterned resistance tolerance is stored in the EEMEM. The actual full scale resistance can, therefore, be known by the host processor in readback mode. The host can execute the appropriate resistance step through a software routine that simplifies open-loop applications as well as precision calibration and tolerance matching applications.

The ADN2850 is available in the 5 mm × 5 mm 16-lead frame chip scale LFCSP and thin, 16-lead TSSOP package. The part is guaranteed to operate over the extended industrial temperature range of −40°C to +85°C.


1 The terms nonvolatile memory and EEMEM are used interchangeably.
2 The terms digital resistor and RDAC are used interchangeably.

Applications

  • SONET, SDH, ATM, Gigabit Ethernet, DWDM laser diode driver, optical supervisory systems
  • Mechanical rheostat replacement
  • Instrumentation gain adjustment
  • Programmable filters, delays, time constants
  • Sensor calibration

FEATURES and BENEFITS

  • Dual-channel, 1024-position resolution
  • 25 kΩ, 250 kΩ nominal resistance
  • Maximum ±8% nominal resistor tolerance error
  • Low temperature coefficient: 35 ppm/°C
  • 2.7 V to 5 V single supply or ±2.5 V dual supply
  • Current monitoring configurable function
  • SPI-compatible serial interface
  • Nonvolatile memory stores wiper settings
  • Power-on refreshed with EEMEM settings
  • Permanent memory write protection
  • Resistance tolerance stored in EEMEM
  • 26 bytes extra nonvolatile memory for user-defined information
  • 1M programming cycles
  • 100-year typical data retention

Functional Block Diagram for ADN2850

Similar Products

  • AD5232: Nonvolatile Memory, Dual, 256-Position Digital Potentiometer
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  • AD5251: I2C, Nonvolatile Memory, Dual 64-Position Digital Potentiometer
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Additional Evaluation Board Information

If you purchase the evaluation board model of this product, you will also need the System Demonstration Platform (SDP). They are used in conjunction as part of a customer evaluation environment.

Documentation

Title Content Type File Type
ADN2850:Nonvolatile Memory, Dual 1024-Position Digital Resistor Data Sheet (Rev E, 06/2012) (pdf, 473 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
AN-628: ADN2850 Evaluation Kit User Manual  (pdf, 385 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
UG-276: Evaluation Board for the ADN2850 Digital Rheostat  (pdf, 580 kB) User Guides PDF
Single-Chip Digitally Controlled Data-Acquisition as Core of Reliable DWDM Communication Systems
(Analog Dialogue, Vol. 36, No. 5, September-October, 2002)
Analog Dialogue HTML
Choosing the Correct digiPOT for Your Application  (pdf, 431 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
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
Programmable 5-30V Power Supply FAQs/RAQs HTML
Programmable LDO with Precision FAQs/RAQs HTML
Manual Push Button LED Driver FAQs/RAQs HTML
Adjustable Voltage Source for Driving LED FAQs/RAQs HTML
Adjustable Current Source for Driving Single LED FAQs/RAQs HTML
Adjustable Current Source for Driving Multiple LEDs FAQs/RAQs HTML
Programmable Bidirectional Current Source FAQs/RAQs HTML
High Power RGB LEDs Driver FAQs/RAQs HTML
Automatic LED Brightness Control FAQs/RAQs HTML
High Voltage DAC FAQs/RAQs HTML
Bipolar DAC with EEPROM FAQs/RAQs HTML
Voltage-to-Current Conversion FAQs/RAQs HTML
Programmable Low Pass Filter FAQs/RAQs HTML
Programmable State-Variable Filter FAQs/RAQs HTML
Programmable Oscillator FAQs/RAQs HTML
Audio Volume Control FAQs/RAQs HTML
Audio Amplifier Volume Control FAQs/RAQs HTML
LCD Panel VCOM Adjustment FAQs/RAQs HTML
Laser Bias and Modulation Current Biasing FAQs/RAQs HTML
Manual Rotary Control FAQs/RAQs HTML
Bipolar Programmable Gain Amplifier FAQs/RAQs HTML
Programmable Current-Sensing Amplifier FAQs/RAQs HTML
6-Bit Controller FAQs/RAQs HTML
Level Shifting Digital Inputs from 3.3V to 5V or Vice Versa FAQs/RAQs HTML
Level Shifting Digital Signals from 0V to +5V to -5V to 0V FAQs/RAQs HTML
Multiple I2C Slave Devices Addressing FAQs/RAQs HTML
Resolution Enhancement FAQs/RAQs HTML
Pseudo Memory Retention FAQs/RAQs HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADN2850 IBIS Model  (ibs) IBIS Models IBS
ADN2850 - Microcontroller No-OS Driver Device Drivers HTML
Digital Potentiometer Linux Driver Device Drivers HTML
ADN2850 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design FPGA HDL HTML
BeMicro FPGA Project for ADN2850 with Nios driver FPGA HDL HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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

ADN2850 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADN2850BCPZ25 Status: Contact ADI 16 ld LFCSP (5x5mm) 16 Ind Tray, 490 $3.91 $3.52 Y  Material Info PCN Purchase
ADN2850BCPZ25-RL7 Status: Production 16 ld LFCSP (5x5mm) 16 Ind Reel, 1500 - $3.52 Y  Material Info PCN Purchase
ADN2850BCPZ250 Status: Production 16 ld LFCSP (5x5mm) 16 Ind Tray, 490 $3.91 $3.52 Y  Material Info PCN Purchase Sample
ADN2850BCPZ250-RL7 Status: Last Time Buy 16 ld LFCSP (5x5mm) 16 Ind Reel, 1500 - $3.52 Y  Material Info PCN/PDN Purchase
ADN2850BRUZ25 Status: Production 16 ld TSSOP 16 Ind Tube, 96 - - Y  Material Info PCN Contact ADI
ADN2850BRUZ25-RL7 Status: Production 16 ld TSSOP 16 Ind Reel, 1000 - - Y  Material Info PCN Contact ADI
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.

ADN2850 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-ADN2850SDZ Status: Production Evaluation Board $59.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Controller Boa $99.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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