LTC6905 - 17MHz to 170MHz Resistor Set SOT-23 Oscillator
Features
- One External Resistor Sets the Frequency
- Fast Start-Up Time: 100µs Typical
- Frequency Range: 17MHz to 170MHz
- Frequency Error ±0.5% Typ 17MHz to 170MHz
(TA = 0°C to 70°C, Over All Settings) - ±20ppm/°C Temperature Stability
- Rise Time: 0.5ns, CL = 5pF
- Timing Jitter: 7.2ps RMS at 170MHz
- 50% ±2.5% Duty Cycle
- 6mA Typical Supply Current, fOSC = 100MHz
- CMOS Output Drives 500Ω Load (VS = 3V)
- Operates from a Single 2.7V to 5.5V Supply
- Low Profile (1mm) ThinSOT Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC6905 precision, programmable silicon oscillator is easy to use and occupies very little board space. It requires only a single resistor to set the output frequency from 17MHz to 170MHz with a typical frequency error of 0.5% or less.
The LTC6905 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. Operation is simple: A single resistor, RSET, between 10K to 25K is used to set the frequency, and an internal three-state divider (DIV input) allows for division of the master clock by 1, 2 or 4, providing three frequencies for each RSET value.
The LTC6905 features a proprietary feedback loop that linearizes the relationship between RSET and frequency, eliminating the need for tables to calculate frequency. The oscillator can be easily programmed using the simple formula outlined below:
See first page of Data Sheet for formula
For higher accuracy, fixed frequency versions that include
an internal frequency-setting resistor, see the LTC6905-XXX Series datasheet.
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 |
|---|---|---|---|---|---|
| LTC6905CS5#PBF | SOT-23 | S5 | C | 05-08-1635 | Yes |
| LTC6905CS5#TRMPBF | SOT-23 | S5 | C | 05-08-1635 | Yes |
| LTC6905CS5#TRPBF | SOT-23 | S5 | C | 05-08-1635 | Yes |
| LTC6905HS5#PBF | SOT-23 | S5 | H | 05-08-1635 | Yes |
| LTC6905HS5#TRMPBF | SOT-23 | S5 | H | 05-08-1635 | Yes |
| LTC6905HS5#TRPBF | SOT-23 | S5 | H | 05-08-1635 | Yes |
| LTC6905IS5#PBF | SOT-23 | S5 | I | 05-08-1635 | Yes |
| LTC6905IS5#TRMPBF | SOT-23 | S5 | I | 05-08-1635 | Yes |
| LTC6905IS5#TRPBF | SOT-23 | S5 | I | 05-08-1635 | Yes |
| LTC6905MPS5#PBF | SOT-23 | S5 | MP | 05-08-1635 | Yes |
| LTC6905MPS5#TRMPBF | SOT-23 | S5 | MP | 05-08-1635 | Yes |
| LTC6905MPS5#TRPBF | SOT-23 | S5 | MP | 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 | |
|---|---|---|---|---|---|---|
| LTC6905CS5#PBF | SOT-23 | C | $2.28 | Yes | ||
| LTC6905CS5#TRMPBF | SOT-23 | C | $2.28 | $1.67 | Yes | |
| LTC6905CS5#TRPBF | SOT-23 | C | $2.28 | $1.65 | Yes | |
| LTC6905HS5#PBF | SOT-23 | H | $3.25 | Yes | ||
| LTC6905HS5#TRMPBF | SOT-23 | H | $3.25 | $2.46 | Yes | |
| LTC6905HS5#TRPBF | SOT-23 | H | $3.25 | $2.44 | Yes | |
| LTC6905IS5#PBF | SOT-23 | I | $2.71 | Yes | ||
| LTC6905IS5#TRMPBF | SOT-23 | I | $2.71 | $2.06 | Yes | |
| LTC6905IS5#TRPBF | SOT-23 | I | $2.71 | $2.04 | Yes | |
| LTC6905MPS5#PBF | SOT-23 | MP | $7.02 | Yes | ||
| LTC6905MPS5#TRMPBF | SOT-23 | MP | $7.02 | $5.09 | Yes | |
| LTC6905MPS5#TRPBF | SOT-23 | MP | $5.04 | 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 |
|---|---|---|---|
| DC2073A-A | LTC6905 Silicon Oscillator Demo Board | $50.00 | |
| 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 | |
|---|---|---|---|---|---|---|
| LTC6905HS5#PBF | SOT-23 | H | $3.25 | Yes | ||
| LTC6905HS5#TRMPBF | SOT-23 | H | $3.25 | $2.46 | Yes | |
| LTC6905HS5#TRPBF | SOT-23 | H | $3.25 | $2.44 | Yes | |
| LTC6905IS5#PBF | SOT-23 | I | $2.71 | Yes | ||
| LTC6905IS5#TRMPBF | SOT-23 | I | $2.71 | $2.06 | Yes | |
| LTC6905IS5#TRPBF | SOT-23 | I | $2.71 | $2.04 | Yes | |
| LTC6905MPS5#PBF | SOT-23 | MP | $7.02 | Yes | ||
| LTC6905MPS5#TRMPBF | SOT-23 | MP | $7.02 | $5.09 | Yes | |
| LTC6905MPS5#TRPBF | SOT-23 | MP | $5.04 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- High Frequency Precision Oscillator
- High Speed Data Bus Clock
- Fixed Crystal Oscillator Replacement
- Ceramic Oscillator Replacement
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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:
LTC6905
LTC6905-100
LTC6905-133
LTC6905-80
LTC6905-96
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.
