LTC1799 - 1kHz to 33MHz Resistor Set SOT-23 Oscillator

The LTC1799 is a precision oscillator that is easy to use and occupies very little PC board space. The oscillator frequency is programmed by a single external resistor (RSET). The LTC1799 has been designed for high accuracy operation (≤1.5% frequency error) without the need for external trim components.

The LTC1799 operates with a single 2.7V to 5.5V power supply and provides a rail-to-rail, 50% duty cycle square wave output. The CMOS output driver ensures fast rise/fall times and rail-to-rail switching. The frequency-setting resistor can vary from 3k to 1M to select a master oscillator frequency between 100kHz and 33MHz (5V supply). The three-state DIV input determines whether the master clock is divided by 1, 10 or 100 before driving the output, providing three frequency ranges spanning 1kHz to 33MHz (5V supply). The LTC1799 features a proprietary feedback loop that linearizes the relationship between RSET and frequency, eliminating the need for tables to calculate frequency.

  • One External Resistor Sets the Frequency
  • Fast Start-Up Time: <1ms
  • 1kHz to 33MHz Frequency Range
  • Frequency Error ≤1.5% 5kHz to 20MHz (TA = 25°C)
  • Frequency Error ≤ 2% 5kHz to 20MHz (TA = 0°C to 70°C)
  • ±40ppm/°C Temperature Stability
  • 0.05%/V Supply Stability
  • 50% ±1% Duty Cycle 1kHz to 2MHz
  • 50% ±5% Duty Cycle 2MHz to 20MHz
  • 1mA Typical Supply Current
  • 100 Ohm CMOS Output Driver
  • Operates from a Single 2.7V to 5.5V Supply
  • Low Profile (1mm) SOT-23 (ThinSOT Package)
Typical Application
LTC1799 Typical Application
LTC1799 Typical Application
  • Low Cost Precision Oscillator
  • Charge Pump Driver
  • Switching Power Supply Clock Reference
  • Clocking Switched Capacitor Filters
  • Fixed Crystal Oscillator Replacement
  • Ceramic Oscillator Replacement
  • Small Footprint Replacement for Econ Oscillators
LTC1799 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
Demo Boards
Part NumberDescriptionPrice
DC2073B-BLTC1799 Silicon Oscillator Demo Board$50.00
Application Note
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LTC1799 Footprints and Symbols