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DS1841
Temperature-Controlled, NV, I²C, Logarithmic Resistor

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


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Data Sheet
FULL DATA SHEET (PDF, 300kB)
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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.

Key Features   Applications/Uses
  • 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

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

    Key Specifications:   Digital Potentiometers
    Part Number Taper POTs Per Pkg. Control Interface Wiper Memory Number of Steps End-to-End Resistance (kΩ) Res. Tol. (%) Temp. Coeff. (typ)(ppm/°C) Wiper Resistance (typ) (Ω) Max. Idle State Supply Current @5V (µA) Applications Features Supply Voltage (V) RoHS Available Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C) Price**
    DS1841  Log 1 I2C Non-Volatile 128 22 20 250 370 1
    Audio Control
    Fiber Communications
    Fibre Optic Modules
    72 Byte Lookup Table
    On-Chip Temperature Sensor and ADC
    2.7 to 5.5 Yes TDFN/10 10 -40 to +95 $0.80 @ 1k
    See All Digital Potentiometers (121)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Diagram
    DS1841: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  • Application Note 4221: How to Optimize Avalanche Photodiode (APD) Bias Range Using a DS1841 Logarithmic Resistor - DS1841

    Evaluation Kits
    none

    Design Guides
  • D/A CONVERTERS (PDF)
  • FIBER (PDF)
  • DIGITAL POTENTIOMETERS (PDF)

    Reliability Reports
  • Reliability Report: DS1841.pdf

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-2 of 2

    DS1841 Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS1841N+  
    TDFN;10 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T1033+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1841N+T&R  
    TDFN;10 pin;10 mm²
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T1033+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    Notes and Comments
    Tyically used with MAX5026 or MAX1523 DC-DC Converters. Can be used with a DS1865 or DS1863 for Triplexor applications.

    More Information
  • New Product Press Release 2008-02-07 

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    2008-05-13
    This page last modified: 2008-05-13



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