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Temperature-Controlled, NV, I²C, Logarithmic Resistor

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

Product Details

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.

Key Features

  • 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

Applications/Uses

  • Instrumentation and Industrial Controls
  • Linear and Nonlinear Compensation
  • Mechanical Potentiometer Replacement
  • Optical Transceivers
Parametric specs for Digital Potentiometers
Steps 128
# Potentiometers 1
Control Interface I2C
Taper Log
Wiper Memory Non-Volatile
REND-TO-END (kΩ) 22
Res. Tol. (%) 20
Temp. Coeff. (ppm/°C) (typ) 250
Wiper Resistance (Ω) (typ) 370
ICC @5V (µA) (max) 1
Package/Pins TDFN/10
Budgetary
Price (See Notes)
$1.03 @1k
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Simplified Block Diagram

DS1841: Typical Operating Circuit DS1841: Typical Operating Circuit Zoom icon

Technical Docs

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Parameters

Parametric specs for Digital Potentiometers
Steps 128
# Potentiometers 1
Control Interface I2C
Taper Log
Wiper Memory Non-Volatile
REND-TO-END (kΩ) 22
Res. Tol. (%) 20
Temp. Coeff. (ppm/°C) (typ) 250
Wiper Resistance (Ω) (typ) 370
ICC @5V (µA) (max) 1
Package/Pins TDFN/10
Budgetary
Price (See Notes)
$1.03 @1k

Key Features

  • 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

Applications/Uses

  • Instrumentation and Industrial Controls
  • Linear and Nonlinear Compensation
  • Mechanical Potentiometer Replacement
  • Optical Transceivers

Description

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.

Simplified Block Diagram

DS1841: Typical Operating Circuit DS1841: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal