ISL23325: Dual, 256-Tap, Low Voltage Digitally Controlled Potentiometer (XDCP™)

The ISL23325 is a volatile, low voltage, low noise, low power, 256-Tap, dual digitally controlled potentiometer (DCP) with an I2C Bus™ interface. It integrates two DCP cores, wiper switches and control logic on a monolithic CMOS integrated circuit.

Each digitally controlled potentiometer is implemented with a combination of resistor elements and CMOS switches. The position of the wipers are controlled by the user through the I2C bus interface. Each potentiometer has an associated volatile Wiper Register (WRi, i = 0, 1) that can be directly written to and read by the user. The contents of the WRi controls the position of the wiper. When powered on, the wiper of each DCP will always commence at mid-scale (128 tap position).

The low voltage, low power consumption, and small package of the ISL23325 make it an ideal choice for use in battery operated equipment. In addition, the ISL23325 has a VLOGIC pin allowing down to 1.2V bus operation, independent from the VCC value. This allows for low logic levels to be connected directly to the ISL23325 without passing through a voltage level shifter.

The DCP can be used as a three-terminal potentiometer or as a two-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.

Key Features
  • Two potentiometers per package
  • 256 resistor taps
  • 10kΩ 50kΩ or 100kΩ total resistance
  • I2C serial interface
    • No additional level translator for low bus supply
    • Three address pins allow up to eight devices per bus
  • Maximum supply current without serial bus activity (standby)
    • 3µA @ VCC and VLOGIC = 5V
    • 1.7µA @ VCC and VLOGIC = 1.7V
  • Shutdown Mode
    • Forces the DCP into an end-to-end open circuit and RWi is connected to RLi internally
    • Reduces power consumption by disconnecting the DCP resistor from the circuit
  • Power supply
    • VCC = 1.7V to 5.5V analog power supply
    • VLOGIC = 1.2V to 5.5V I2C bus/logic power supply
  • Wiper resistance: 70Ω typical @ VCC = 3.3V
  • Power-on preset to mid-scale (128 tap position)
  • Extended industrial temperature range: -40°C to +125°C
  • 14 Ld TSSOP or 16 Ld µTQFN packages
  • Pb-free (RoHS Compliant)
Applications
  • Power supply margining
  • Trimming sensor circuits
  • Gain adjustment in battery powered instruments
  • RF power amplifier bias compensation
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
AN002: Principles of Data Acquisition and ConversionPDF13 Nov 2014257 KB
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL23325 DatasheetPDF23 Sep 2015751 KB
Software
TitleTypeUpdatedSizeOther Languages
DCP Evaluation Board Software v5.2.0EXE20 Mar 20152.73 MB
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
ISL23325TFRUZ-T7A16 Ld uTQFN T+R0.0062161260RoHS
ISL23325TFRUZ-TK16 Ld uTQFN T+R0.0062161260RoHS
ISL23325TFVZ14 Ld TSSOP0.054143260RoHS
ISL23325TFVZ-T7A14 Ld TSSOP T+R0.054143260RoHS
ISL23325TFVZ-TK14 Ld TSSOP T+R0.054143260RoHS
ISL23325UFRUZ-T7A16 Ld uTQFN T+R0.0062161260RoHS
ISL23325UFRUZ-TK16 Ld uTQFN T+R0.0062161260RoHS
ISL23325UFVZ14 Ld TSSOP0.054143260RoHS
ISL23325UFVZ-T7A14 Ld TSSOP T+R0.054143260RoHS
ISL23325UFVZ-TK14 Ld TSSOP T+R0.054143260RoHS
ISL23325WFRUZ-T7A16 Ld uTQFN T+R0.0062161260RoHS
ISL23325WFRUZ-TK16 Ld uTQFN T+R0.0062161260RoHS
ISL23325WFVZ14 Ld TSSOP0.054143260RoHS
ISL23325WFVZ-T7A14 Ld TSSOP T+R0.054143260RoHS
ISL23325WFVZ-TK14 Ld TSSOP T+R0.054143260RoHS
ISL23325 Datasheet 23 Sep 2015
16 Ld uTQFN T+R ISL54057
14 Ld TSSOP T+R ISL12023
ISL23325
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
AN002: Principles of Data Acquisition and Conversion 13 Nov 2014
DCP Evaluation Board Software v5.2.0 20 Mar 2015
Digital Potentiometer (DCP) Evaluation USB Kit User Guide 12 May 2015