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

Features

  • 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)
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LTC1799 Typical Application
LTC1799 Typical Application

Description

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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC1799CS5#PBF SOT-23 S5 C 05-08-1635 Yes
LTC1799CS5#TRMPBF SOT-23 S5 C 05-08-1635 Yes
LTC1799CS5#TRPBF SOT-23 S5 C 05-08-1635 Yes
LTC1799HS5#PBF SOT-23 S5 H 05-08-1635 Yes
LTC1799HS5#TRMPBF SOT-23 S5 H 05-08-1635 Yes
LTC1799HS5#TRPBF SOT-23 S5 H 05-08-1635 Yes
LTC1799IS5#PBF SOT-23 S5 I 05-08-1635 Yes
LTC1799IS5#TRMPBF SOT-23 S5 I 05-08-1635 Yes
LTC1799IS5#TRPBF SOT-23 S5 I 05-08-1635 Yes


LTC1799 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC1799CS5#PBF SOT-23 C $2.65 Yes
LTC1799CS5#TRMPBF SOT-23 C $2.65 $1.57 Yes
LTC1799CS5#TRPBF SOT-23 C $2.65 $1.55 Yes
LTC1799HS5#PBF SOT-23 H $3.90 Yes
LTC1799HS5#TRMPBF SOT-23 H $3.90 $2.01 Yes
LTC1799HS5#TRPBF SOT-23 H $3.90 $1.99 Yes
LTC1799IS5#PBF SOT-23 I $3.57 Yes
LTC1799IS5#TRMPBF SOT-23 I $3.57 $1.83 Yes
LTC1799IS5#TRPBF SOT-23 I $3.57 $1.81 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2073B-B LTC1799 Silicon Oscillator Demo Board $50.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC1799HS5#PBF SOT-23 H $3.90 Yes
LTC1799HS5#TRMPBF SOT-23 H $3.90 $2.01 Yes
LTC1799HS5#TRPBF SOT-23 H $3.90 $1.99 Yes
LTC1799IS5#PBF SOT-23 I $3.57 Yes
LTC1799IS5#TRMPBF SOT-23 I $3.57 $1.83 Yes
LTC1799IS5#TRPBF SOT-23 I $3.57 $1.81 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

  • 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

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC1799

OscCalc, an Excel based selection and synthesis tool, allows you to choose and configure the Silicon Oscillator best suited for your application.

  • Download and open OscCalc
  • Enable Macros
  • Enter your desired switching frequency. Suitable silicon oscillators will be highlighted in green. Clicking on a part will show you the external component values and settings required to achieve your desired switching frequency.

Technical Support