LTC6902 - Multiphase Oscillator with Spread Spectrum Frequency Modulation

Features

  • 2-, 3- or 4-Phase Outputs
  • Optional Spread Spectrum Frequency Modulation for Improved EMC Performance
  • 5kHz to 20MHz Frequency Range
  • One External Resistor Sets the Frequency
  • One External Resistor Sets Percent Frequency Spreading
  • 400µA Typical Supply Current, VS = 3V, 1MHz
  • Frequency Error <=1.5% Max, 5kHz to 10MHz (TA = 25°C)
  • Frequency Error <= 2% Max, 5kHz to 10MHz (TA = 0°C to 70°C)
  • ±40ppm/°C Temperature Stability
  • Fast Start-Up Time: 50µs to 1.5ms
  • 100 Ohm CMOS Output Driver
  • Operates from a Single 2.7V to 5.5V Supply
  • Available in 10-Lead MS Package
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LTC6902 Typical Application
LTC6902 Typical Application

Description

The LTC6902 is a precision, low power and easy-to-use oscillator that provides multiphase outputs in a small package. The oscillator frequency is set by a single external resistor (RSET). The LTC6902 also provides an optional spread spectrum frequency modulation (SSFM) capability that can be activated and controlled by an additional external resistor (RMOD).

The LTC6902's master oscillator is controlled by the RSET resistor and has a range of 100kHz and 20MHz. In order to accommodate a wider output frequency range, a programmable divider (divide by 1, 10 or 100) is included. The integrated programmable multiphase circuit provides either 2-, 3- or 4-phase waveforms.

The LTC6902's SSFM capability modulates the oscillator?s frequency by a pseudorandom noise (PRN) signal to spread the oscillator?s energy over a wide frequency band. This spreading decreases the peak electromagnetic radiation level and improves electromagnetic compatibility (EMC) performance. The amount of frequency spreading is programmable by a single additional external resistor (RMOD) and is disabled by grounding the MOD pin.

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
LTC6902CMS#PBF MS-10 MS C 05-08-1661 Yes
LTC6902CMS#TRPBF MS-10 MS C 05-08-1661 Yes
LTC6902IMS#PBF MS-10 MS I 05-08-1661 Yes
LTC6902IMS#TRPBF MS-10 MS I 05-08-1661 Yes


LTC6902 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
LTC6902CMS#PBF MS-10 C $2.90 $2.20 Yes
LTC6902CMS#TRPBF MS-10 C $2.25 Yes
LTC6902IMS#PBF MS-10 I $3.63 $2.75 Yes
LTC6902IMS#TRPBF MS-10 I $2.80 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.

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
LTC6902IMS#PBF MS-10 I $3.63 $2.75 Yes
LTC6902IMS#TRPBF MS-10 I $2.80 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

  • Switching Power Supply Clock Reference
  • Portable and Battery-Powered Equipment
  • PDAs
  • Cell Phones
  • Clocking Switched Capacitor Filters

Product Notifications

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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:
LTC6902

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