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DS1858
Dual Temperature-Controlled Resistors with Three Monitors

Industry's First Integrated Controller-Monitors for SFF/SFP Optical Modules


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 428kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail
The DS1858 dual temperature-controlled nonvolatile (NV) variable resistors with three monitors consists of two 50kΩ 256-position linear variable resistors, three analog monitor inputs (MON1, MON2, MON3), and a direct-to-digital temperature sensor. The device provides an ideal method for setting and temperature-compensating bias voltages and currents in control applications using minimal circuitry. The variable resistor settings are stored in EEPROM memory and can be accessed over the 2-wire serial bus.

Key Features   Applications/Uses
  • Five Total Monitored Channels (Temperature, VCC, MON1, MON2, MON3)
  • Three External Analog Inputs (MON1, MON2, MON3)
  • Internal Direct-to-Digital Temperature Sensor
  • Two 50kΩ, Linear, 256-Position, Nonvolatile Temperature-Controlled Variable Resistors
  • Resistor Settings Changeable Every 2°C
  • Access to Monitoring and ID Information Configurable with Separate Device Addresses
  • 2-Wire Serial Interface
  • Two Buffers with TTL/CMOS-Compatible Inputs and Open-Drain Outputs
  • Operates from a 3.3V or 5V Supply
  • SFF-8472 Compatible

 
  • Diagnostic Monitoring
  • Instrumentation and Industrial Controls
  • Optical Transceivers
  • Optical Transponders
  • RF Power Amps

    Key Specifications:  Fiber Monitoring and Control
    Part Number Features ADCs Resolution
    (bits)
    DACs/ Resistors FS Out
    (kΩ)
    Steps Temp. Sensor Memory VSUPPLY
    (V)
    Control Interface EV Kit Price
    See Notes
    DS1858 
    Alarm Flags
    Complies or Compatible to SFF-8472
    External Calibration
    Look-Up Table Compensation
    User EEPROM
    5-Input Muxable 12 2 Resistors 50kohms 256 Internal EEPROM
    3.3
    5
    2-Wire Yes $2.38 @1k
    See All Fiber Monitoring and Control (12)

    Diagram
    DS1858: Typical Operating Circuit
    Typical Operating Circuit

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    2006-05-18
    This page last modified: 2007-08-06


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