Overview

Description

The ISL23328 is a volatile, low voltage, low noise, low power, 128-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 (64 tap position). The low voltage, low power consumption, and small package of the ISL23328 make it an ideal choice for use in battery operated equipment. In addition, the ISL23328 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 ISL23328 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.

Features

  • Two potentiometers per package
  • 128 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
  • Power supply
  • VCC = 1.7V to 5.5V analog power supply
  • VLOGIC = 1.2V to 5.5V I2C bus/logic power supply
  • 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
  • Wiper resistance: 70Ω typical @ VCC = 3.3V
  • Power-on preset to mid-scale (64 tap position)
  • Extended industrial temperature range: -40°C to +125°C
  • 14 Ld TSSOP or 16 Ld UTQFN packages
  • Pb-free (RoHS Compliant)

Applications

Applications

  • Power supply margining
  • Trimming sensor circuits
  • Gain adjustment in battery powered instruments
  • RF power amplifier bias compensation

Documentation

Title Type Date
PDF1.17 MB
Datasheet
PDF251 KB
Application Note
PDF503 KB
Application Note
PDF287 KB
Application Note
PDF1.17 MB
End Of Life Notice
PDF1.40 MB
Manual - Development Tools
PDF430 KB
Manual - Development Tools
PDF1.21 MB
Manual - Development Tools
PDF208 KB
Price Increase Notice
PDF414 KB
Product Advisory
PDF121 KB
Product Change Notice
PDF120 KB
Product Change Notice

Design & Development

Software & Tools

Software Downloads

Title Type Date
PDF1.17 MB
End Of Life Notice
EXE2.56 MB
Library
ZIP4.38 MB
PCB Design Files
ZIP4.56 MB
PCB Design Files

Models

Support