AD5235

PRODUCTION

Nonvolatile Memory, Dual 1024-Position Digital Potentiometer

Data Sheet (Rev. F) Product Selection Table
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Overview

  • 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
  • SPI-compatible serial interface
  • Nonvolatile memory stores wiper settings
  • Power-on refreshed with EEMEM settings
  • Permanent memory write protection
  • Resistance tolerance stored in EEMEM
  • See data sheet for additional features

AD5235-EP supports defense and aerospace applications (AQEC standard)

  • Download AD5235-EP data sheet (pdf)
  • Temperature range:  −40°C to +125°C
  • Controlled manufacturing baseline
  • 1 assembly/test site
  • 1 fabrication site
  • Enhanced product change notification
  • Qualification data available on request
  • V62/11605 DSCC Drawing Number

The AD5235 is a dual-channel, nonvolatile memory, digitally controlled potentiometer with 1024-step resolution, offering guaranteed maximum low resistor tolerance error of ±8%. The device performs the same electronic adjustment function as a mechanical potentiometer with enhanced resolution, solid state reliability, and superior low temperature coefficient performance. The versatile programming of the AD5235 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 EEMEM 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 RDAC register, which sets the resistance between Terminal W and Terminal A and 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 AD5235 patterned resistance tolerance is stored in the EEMEM. The actual end-to-end 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 AD5235 is available in a thin, 16-lead TSSOP package. The part is guaranteed to operate over the extended industrial temperature range of −40°C to +85°C.

APPLICATIONS

  • DWDM laser diode driver, optical supervisory systems
  • Mechanical potentiometer replacement
  • Instrumentation: gain, offset adjustment
  • Programmable voltage-to-current conversion
  • Programmable filters, delays, time constants
  • Programmable power supply
  • Low resolution DAC replacement
  • Sensor calibration
AD5235
Nonvolatile Memory, Dual 1024-Position Digital Potentiometer
AD5235-fbl AD5235-pc
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Documentation

Data Sheet 3

User Guide 1

Application Note 6

Frequently Asked Question 1

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Software Resources

Device Drivers 3

Tools & Simulations

IBIS Model 1

Evaluation Kits

eval board
schematic 1
EVAL-AD5235

AD5235 Evaluation Board

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Features and Benefits

  • Full featured evaluation board for the AD5235
  • Several test circuits
  • Various ac/dc input signals
  • PC control via a separately purchased system demonstration platform (SDP)
  • PC control software
  • 26 extra bytes in EEMEM for user-defined information
  • Resistor tolerance error stored in EEMEM

Product Details

With versatile programmability, the AD5235 allows multiple modes of operation, including read/write access in the RDAC and EEMEM registers, increment / decrement of resistance, resistance changes in ±6 dB scales, wiper setting read-back, and extra EEMEM for storing user-defined information, such as memory data for other components or a lookup table.

The AD5235 supports dual-supply ±2.25 V to ±2.75 V operation and single-supply 2.7 V to 5.5 V operation, making the device suited for battery-powered applications and many other applications. In addition, the AD5235 uses a versatile SPI-compatible serial interface, allowing speeds of up to 50 MHz .

The EVAL-AD5235SDZ can operate in single-supply and dual-supply mode and incorporates an internal power supply from the USB.

Complete specifications for the AD5235 part can be found in the AD5235 data sheet.
EVAL-AD5235
AD5235 Evaluation Board
EVAL-AD5235SDZ

Latest Discussions

1 Years Ago
Asymmetric supply voltage support
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ad5235 A to B resistance measurement not stable with Ohm meter
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Bias Current Generation
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