DS1841

NOT RECOMMENDED FOR NEW DESIGNS

Temperature-Controlled, NV, I²C, Logarithmic Resistor

Industry's Only Temperature-Compensated Resistor Optimized for APD Bias in Fiber Optic Modules

Data Sheet (Rev. 2) Product Selection Table
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Overview

  • 22kΩ to 3.7kΩ Adjustable Logarithmic Resistor with a 3.6kΩ Fixed Resistor
  • 128 Wiper Tap Points
  • On-Chip Temperature Sensor and ADC
  • 72-Byte Lookup Table (LUT)
  • I²C-Compatible Serial Interface
  • Address Pins Allow Up to Four DS1841s to Share the Same I²C Bus
  • Digital Supply of 2.7V to 5.5V
  • -40°C to +100°C Operating Range
  • 3mm x 3mm, 10-Pin TDFN Package

The DS1841 is a 7-bit, logarithmic, nonvolatile (NV) digital resistor that features an on-chip temperature sensor and associated analog-to-digital converter (ADC). The integrated temperature sensor indexes a 72-byte NV lookup table (LUT) encompassing a temperature range from -40°C to +100°C. The LUT output can drive the resistor directly or be added to an NV initial-value register (IVR) to drive the resistor. This flexible LUT-based architecture allows the DS1841 to provide a temperature-compensated resistor output with arbitrary slope. Programming is accomplished by an I²C-compatible interface, which can operate at speeds of up to 400kHz.

Applications

  • Instrumentation and Industrial Controls
  • Linear and Nonlinear Compensation
  • Mechanical Potentiometer Replacement
  • Optical Transceivers
DS1841
Temperature-Controlled, NV, I²C, Logarithmic Resistor
DS1841: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 2

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