EconOscillator Frequency Synthesizer

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The DS1085 is a dual-output frequency synthesizer requiring no external timing components for operation. It can be used as a standalone oscillator or as a dynamically programmed, processor-controlled peripheral device. An internal master oscillator can be programmed from 66MHz to 133MHz with three resolution options of 10kHz, 25kHz, and 50kHz. A programmable, 3-bit prescaler (divide-by-1, 2, 4, or 8) permits the generation of a reference oscillator output (OUT0) from the master, ranging from 8.2MHz to 133MHz. A second independent prescaler and a 1-to-1025 divider allows the generation of a main oscillator output (OUT1) from 8.1kHz to 133MHz. The two outputs, although synchronous with the master, can be independently programmed. The combination of programmable master oscillator, prescalers, and dividers allows the generation of thousands of user-specified frequencies. All master oscillator, prescaler, and divider settings are stored in NV (EEPROM) memory, providing a default value on power-up that allows it to be used as a standalone oscillator. A 2-wire serial interface allows in-circuit, on-the-fly programming of the master oscillator, prescalers (P0 and P1), and divider (N). This allows dynamic frequency modification, if required, or, for fixed-frequency applications, the DS1085 can be used with factory- or user-programmed values.
DS1085: Block Diagram DS1085: Block Diagram Enlarge+

Key Features

  • User-Programmable Frequency Synthesizer
  • Programmable From 8.1kHz to 133MHz
  • Dual Synchronous Outputs
  • 8.2MHz to 133MHz Reference Oscillator Output
  • 8.1kHz to 133MHz Main Oscillator Output
  • Three Resolution Options
  • 2-Wire Serial Interface
  • 0.75% Absolute Accuracy
  • Nonvolatile (NV) Frequency Settings
  • Single 5V Supply
  • No External Timing Components
  • Power-Down Mode
  • Applications/Uses

    • Cable Modems
    • Cell Phones
    • Computer Peripherals
    • Copiers
    • PCs
    • Printers

    See parametric specs for Silicon Oscillators (17)

    Part NumberfOUT
    User Prog. fOUTSpread SpectrumVCC
    Reset OutOper. Temp.
    maxminmaxSee Notes
    DS1085 1338.1±1 (0 to 70°C)I2CNo4.75 to 5.25No0 to +70
    SOIC (N)/8
    $5.08 @1k

    Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
    Product Reliability Reports: DS1085.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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