Timing Silicon Oscillators
Timing Extended Temperature (H & MP) Timing

LTC6909 - 1 to 8 Output, Multiphase Oscillator with Spread Spectrum Modulation

LTC6908 - Dual Output Oscillator with Spread Spectrum Modulation

Features

  • LTC6908-1: Complementary Outputs (0°/180°)
  • LTC6908-2: Quadrature Outputs (0°/90°)
  • 50kHz to 10MHz Frequency Range
  • One External Resistor Sets the Frequency
  • Optional Spread Spectrum Frequency Modulation for Improved EMC Performance
  • ±10% Frequency Spreading
  • 400µA Supply Current Typical (V+ = 5V, 50kHz)
  • Frequency Error ≤1.5% Max (TA = 25°C, V+ = 3V)
  • ±40ppm/°C Temperature Stability
  • Fast Start-Up Time: 260µs Typical (1MHz)
  • Outputs Muted Until Stable
  • Operates from a Single 2.7V to 5.5V Supply
  • Available in Low Profile (1mm) ThinSOT and DFN (2mm × 3mm) Packages

Typical Application

LTC6908 Typical Application
LTC6908 Typical Application

Description

The LTC6908 is an easy-to-use precision oscillator that provides 2-outputs, shifted by either 180° or 90°. The oscillator frequency is programmed by a single external resistor (RSET) and spread spectrum frequency modulation (SSFM) can be activated for improved electromagnetic compatibility (EMC) performance. The LTC6908 operates with a single 2.7V to 5.5V supply and provides rail-to-rail, 50% duty cycle square wave outputs. A single resistor from 10k to 2M is used to select an oscillator frequency from 50kHz to 10MHz (5V supply). The oscillator can be easily programmed using the simple formula outlined below:

fOUT =10MHz • 10k/RSET

The LTC6908’s SSFM capability modulates the output frequency by a pseudorandom noise (PRN) signal to decrease the peak electromagnetic radiation level and improve EMC performance. The amount of frequency spreading is fi xed at ±10% of the center frequency. When SSFM is enabled, the rate of modulation is selected by the user. The three possible modulation rates are fOUT/16, fOUT/32 and fOUT/64.

Packaging

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

SOT-23, DFN-6

LTC6908 Package Drawing
LTC6908 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC6908CDCB-1 DFN 6 C $2.45 View
LTC6908CDCB-1#PBF DFN 6 C $2.45 View
LTC6908CDCB-1#TR DFN 6 C $2.45 $1.65 View
LTC6908CDCB-1#TRM DFN 6 C $2.45 $1.67 View
LTC6908CDCB-1#TRMPBF DFN 6 C $2.45 $1.67 View
LTC6908CDCB-1#TRPBF DFN 6 C $2.45 $1.65 View
LTC6908CDCB-2 DFN 6 C $2.45 View
LTC6908CDCB-2#PBF DFN 6 C $2.45 View
LTC6908CDCB-2#TR DFN 6 C $2.45 $1.65 View
LTC6908CDCB-2#TRM DFN 6 C $2.45 $1.67 View
LTC6908CDCB-2#TRMPBF DFN 6 C $2.45 $1.67 View
LTC6908CDCB-2#TRPBF DFN 6 C $2.45 $1.65 View
LTC6908CS6-1 SOT-23 6 C $2.43 View
LTC6908CS6-1#PBF SOT-23 6 C $2.43 View
LTC6908CS6-1#TR SOT-23 6 C $2.43 $1.65 View
LTC6908CS6-1#TRM SOT-23 6 C $2.43 $1.67 View
LTC6908CS6-1#TRMPBF SOT-23 6 C $2.43 $1.67 View
LTC6908CS6-1#TRPBF SOT-23 6 C $2.43 $1.65 View
LTC6908CS6-2 SOT-23 6 C $2.43 View
LTC6908CS6-2#PBF SOT-23 6 C $2.43 View
LTC6908CS6-2#TR SOT-23 6 C $2.43 $1.65 View
LTC6908CS6-2#TRM SOT-23 6 C $2.43 $1.67 View
LTC6908CS6-2#TRMPBF SOT-23 6 C $2.43 $1.67 View
LTC6908CS6-2#TRPBF SOT-23 6 C $2.43 $1.65 View
LTC6908HS6-1 SOT-23 6 H $3.46 View
LTC6908HS6-1#PBF SOT-23 6 H $3.46 View
LTC6908HS6-1#TR SOT-23 6 H $3.46 $2.44 View
LTC6908HS6-1#TRM SOT-23 6 H $3.46 $2.46 View
LTC6908HS6-1#TRMPBF SOT-23 6 H $3.46 $2.46 View
LTC6908HS6-1#TRPBF SOT-23 6 H $3.46 $2.44 View
LTC6908HS6-2 SOT-23 6 H $3.46 View
LTC6908HS6-2#PBF SOT-23 6 H $3.46 View
LTC6908HS6-2#TR SOT-23 6 H $3.46 $2.44 View
LTC6908HS6-2#TRM SOT-23 6 H $3.46 $2.46 View
LTC6908HS6-2#TRMPBF SOT-23 6 H $3.46 $2.46 View
LTC6908HS6-2#TRPBF SOT-23 6 H $3.46 $2.44 View
LTC6908IDCB-1 DFN 6 I $2.92 View
LTC6908IDCB-1#PBF DFN 18 I $2.92 View
LTC6908IDCB-1#TR DFN 6 I $2.92 $2.04 View
LTC6908IDCB-1#TRM DFN 6 I $2.92 $2.06 View
LTC6908IDCB-1#TRMPBF DFN 6 I $2.92 $2.06 View
LTC6908IDCB-1#TRPBF DFN 6 I $2.92 $2.04 View
LTC6908IDCB-2 DFN 6 I $2.92 View
LTC6908IDCB-2#PBF DFN 6 I $2.92 View
LTC6908IDCB-2#TR DFN 6 I $2.92 $2.04 View
LTC6908IDCB-2#TRM DFN 6 I $2.92 $2.06 View
LTC6908IDCB-2#TRMPBF DFN 6 I $2.92 $2.06 View
LTC6908IDCB-2#TRPBF DFN 6 I $2.92 $2.04 View
LTC6908IS6-1 SOT-23 6 I $2.90 View
LTC6908IS6-1#PBF SOT-23 6 I $2.90 View
LTC6908IS6-1#TR SOT-23 6 I $2.90 $2.04 View
LTC6908IS6-1#TRM SOT-23 6 I $2.90 $2.06 View
LTC6908IS6-1#TRMPBF SOT-23 6 I $2.90 $2.06 View
LTC6908IS6-1#TRPBF SOT-23 6 I $2.90 $2.04 View
LTC6908IS6-2 SOT-23 6 I $2.90 View
LTC6908IS6-2#PBF SOT-23 6 I $2.90 View
LTC6908IS6-2#TR SOT-23 6 I $2.90 $2.04 View
LTC6908IS6-2#TRM SOT-23 6 I $2.90 $2.06 View
LTC6908IS6-2#TRMPBF SOT-23 6 I $2.90 $2.06 View
LTC6908IS6-2#TRPBF SOT-23 6 I $2.90 $2.04 View
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* 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
DC814A2-J LTC6908-1 DEMO BOARD; BUFFER BOARD (DIP8 CLOCK BOARD NOT INCLUDED) $50.00
DC814D-J LTC6908-1 DIP8 CLOCK BOARD $25.00
DC814D-K LTC6908-2 DIP8 CLOCK BOARD $25.00
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Click here to view our complete list of demo boards

Applications

  • Switching Power Supply Clock Reference
  • Portable and Battery-Powered Equipment
  • Precision Programmable Oscillator
  • Charge Pump Driver

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Related models available in LTspice IV
LTC6908-1
LTC6908-2

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