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)
AEC-Q100 data available for specific packages
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 |
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 Now • Request Samples | ||||||
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 | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports 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 Now • Request Samples | ||||||
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
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
