ISL22429: Dual Digitally Controlled Potentiometer; Low Noise, Low Power, SPI® Bus, 128 Taps, Wiper Only

The ISL22429 integrates two digitally controlled potentiometers (DCP) and non-volatile memory on a monolithic CMOS integrated circuit.

The digitally controlled potentiometers are implemented with a combination of resistor elements and CMOS switches. The position of the wipers are controlled by the user through the SPI serial interface. Each potentiometer has an associated volatile Wiper Register (WR) and a non-volatile Initial Value Register (IVR) that can be directly written to and read by the user. The contents of the WR controls the position of the wiper. At power-up the device recalls the contents of the DCP's IVR to the corresponding WR.

The DCP can be used as a voltage divider in a wide variety of applications including control, parameter adjustments, AC measurement and signal processing.

Key Features
  • Two potentiometers in one package
  • 128 resistor taps
  • SPI serial interface
  • Non-volatile storage of wiper position
  • Wiper resistance: 70Ω typical @ 3.3V
  • Shutdown mode
  • Shutdown current 5µA max
  • Power supply: 2.7V to 5.5V
  • 50kΩ or 10kΩ total resistance
  • High reliability
    • Endurance: 1,000,000 data changes per bit per register
    • Register data retention: 50 years @ T ≤ +55°C
  • 10 Lead MSOP
  • Pb-free (RoHS compliant)
Typical Diagram
Application Notes
TitleTypeUpdatedSizeOther Languages
AN9705: A Theoretical View of Coherent SamplingPDF13 Nov 201425 KB
AN9675: Coherent and Windowed Sampling with A/D ConvertersPDF13 Nov 2014160 KB
AN1699: Digital Control Potentiometers Offer Hidden Benefits for Many DesignsPDF13 Nov 2014129 KB
AN1425: Get Precision Performance from a Digitally Controlled Potentiometer (DCP)PDF13 Nov 201456 KB
AN002: Principles of Data Acquisition and ConversionPDF13 Nov 2014257 KB
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL22429 DatasheetPDF17 Nov 2014328 KB
Software
TitleTypeUpdatedSizeOther Languages
DCP Evaluation Board Software v5.2.0EXE20 Mar 20152.73 MB
Tech Briefs
TitleTypeUpdatedSizeOther Languages
TB458: Converting a Fixed PWM to an Adjustable PWMPDF19 Nov 2014147 KB
User Guides
TitleTypeUpdatedSizeOther Languages
Digital Potentiometer (DCP) Evaluation USB Kit User GuidePDF12 May 2015330 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL22429UFU10Z10 Ld MSOP0.02610260RoHS
ISL22429UFU10Z-TK10 Ld MSOP T+R0.02610260RoHS
ISL22429WFU10Z10 Ld MSOP0.02610260RoHS
ISL22429WFU10Z-TK10 Ld MSOP T+R0.02610260RoHS
ISL22429 Datasheet 17 Nov 2014
AN9705: A Theoretical View of Coherent Sampling 13 Nov 2014
AN9675: Coherent and Windowed Sampling with A/D Converters 13 Nov 2014
AN1699: Digital Control Potentiometers Offer Hidden Benefits for Many Designs 13 Nov 2014
AN1425: Get Precision Performance from a Digitally Controlled Potentiometer (DCP) 13 Nov 2014
AN002: Principles of Data Acquisition and Conversion 13 Nov 2014
DCP Evaluation Board Software v5.2.0 20 Mar 2015
TB458: Converting a Fixed PWM to an Adjustable PWM 19 Nov 2014
Digital Potentiometer (DCP) Evaluation USB Kit User Guide 12 May 2015