Analog Products

Overview

The ISL23418 is a volatile, low voltage, low noise, low power, SPI™ bus, 128 taps, single digitally controlled potentiometer (DCP), which integrates DCP core, wiper switches, and control logic on a monolithic CMOS integrated circuit. The digitally controlled potentiometer is implemented with a combination of resistor elements and CMOS switches. The position of the wiper is controlled by the user through the SPI bus interface. The potentiometer has an associated volatile Wiper Register (WR) that can be directly written to and read by the user. The contents of the WR controls the position of the wiper. When powered on, the ISL23418 wiper always commences at mid-scale (64-tap position). The low voltage, low power consumption, and small package size of the ISL23418 make it an ideal choice for use in battery operated equipment. The ISL23418 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 ISL23418 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.

ISL23418 Functional Diagram
ISL23418 Functional Diagram
  • 128 Resistor Taps
  • SPI Serial Interface
  • No Additional Level Translator for Low Bus Supply
  • Daisy Chaining of Multiple DCP
  • Wiper Resistance: 70Ω Typical @ VCC = 3.3V
  • Shutdown Mode: Forces DCP into End-to-end Open Circuit; RW Shorted to RL Internally
  • Power-on Preset to Mid-scale (64-tap Position)
  • Shutdown and Standby Current <2.8µA Max
  • Power Supply
  • VCC = 1.7V to 5.5V Analog Power Supply
  • VLOGIC = 1.2V to 5.5V SPI Bus/Logic Power Supply
  • DCP Terminal Voltage from 0V to VCC
  • 10kΩ, 50kΩ or 100kΩ Total Resistance
  • Extended Industrial Temperature Range: -40°C to +125°C
  • 10 Ld MSOP or 10 Ld uTQFN Packages
  • Pb-free (RoHS compliant)

Applications

  • Power Supply Margining
  • RF Power Amplifier Bias Compensation
  • LCD Bias Compensation
  • Gain Adjustment in Battery Powered Instruments
  • Portable Medical Equipment Calibration

Documentation

Type Title Date
Datasheet
ISL23418 Datasheet
PDF 1.17 MB
Manual - Development Tools
Digital Potentiometer (DCP) Evaluation USB Kit Manual
PDF 1.40 MB
Price Increase Notice
PIN19028 - Q3 Cy 19 Price Increase Notice
PDF 208 KB
End Of Life Notice
PLC18009 - Q2 Standard EOL Notice
PDF 345 KB
Product Advisory
PA14042 - Minimum Line Quantity Change
PDF 363 KB
Product Change Notice
PCN11059 - Shipping Tube Change for Intersil MSOP Packaged Products
PDF 117 KB
Application Note
AN1699: Digital Control Potentiometers Offer Hidden Benefits for Many Designs
PDF 251 KB
Application Note
AN9675: A Tutorial in Coherent and Windowed Sampling with A/D Converters
PDF 503 KB
Application Note
AN9705: A Theoretical View of Coherent Sampling
PDF 287 KB
9 items

Design & Development

Software Downloads
Type Title Date
End Of Life Notice
PLC18009 - Q2 Standard EOL Notice
PDF 345 KB
Library
DCP Evaluation Board Software v6.03
EXE 2.56 MB
2 items

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

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    ISL23418UFUZ
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    		 MSOP Tube 4000 Get Samples,
    ISL23418UFUZ-TK
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    		MSOP Reel 4000
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