3.3V EconOscillator Frequency Synthesizer

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The DS1085L 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 33MHz to 66MHz with three resolution options of 5kHz, 12.5kHz, and 25kHz. 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 4.13MHz to 66MHz. A second independent prescaler and a 1-to-1025 divider allow the generation of a main oscillator output (OUT1) from 4.1kHz to 66MHz. 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 DS1085L can be used with factory- or user-programmed values.

External control inputs, CTRL1 and CTRL0, enable or disable the two oscillator outputs. Both outputs feature a synchronous enable that ensures no output glitches when the output is enabled and a constant time interval (for a given frequency setting) from an enable signal to the first output transition. These inputs can also be configured to disable the master oscillator, putting the device into a low-power mode for power-sensitive applications.
DS1085L: Block Diagram DS1085L: Block Diagram Enlarge+

Key Features

  • User-Programmable Frequency Synthesizer
  • Programmable From 4.1kHz to 66MHz
  • Dual Synchronous Outputs
  • 4.13MHz to 66MHz Reference Oscillator Output
  • 4.1kHz to 66MHz Main Oscillator Output
  • Single 3.0 to 3.6V Supply
  • Three Resolution Options
  • 2-Wire Serial Interface
  • 0.75% Absolute Accuracy
  • Nonvolatile (NV) Frequency Settings
  • No External Timing Components
  • Power-Down Mode
  • Applications/Uses

    • Cable Modems
    • Cell Phones
    • Computer Peripherals
    • Copiers
    • PCs
    • Printers
    Part NumberfOUT
    User Prog. fOUTSpread SpectrumVCC
    Reset OutOper. Temp.
    maxminmaxSee Notes
    DS1085L 664.1±1.5 (0 to 70°C)I2CNo3.0 to 3.6No0 to +70
    SOIC (N)/8
    $3.31 @1k
    See All Silicon Oscillators (17)
    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.

    DS1070K: Oscillator Evaluation Kit

    Technical Documents

    App Note 182 Frequency Calculator for the DS1085/DS1085L EconOscillator

    Quality and Environmental Data

    Product Reliability Reports: DS1085L.pdf 
    Lead-Free Package Tin (Sn) Whisker Reports
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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.

    Quality Management System >
    Environmental Management System >


    Related Resources

    Type ID Title
    Evaluation Board4969DS1070K Oscillator Evaluation Kit