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

Typical Application

LTC6905 Typical Application
LTC6905 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

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

SOT-23

LTC6905 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC6905CS5 SOT 5 C $2.28 View
LTC6905CS5#PBF SOT 5 C $2.28 View
LTC6905CS5#TR SOT 5 C $2.28 $1.65 View
LTC6905CS5#TRM SOT 5 C $2.28 $1.67 View
LTC6905CS5#TRMPBF SOT 5 C $2.28 $1.67 View
LTC6905CS5#TRPBF SOT 5 C $2.28 $1.65 View
LTC6905CS5-100 SOT 5 C $1.71 View
LTC6905CS5-100#PBF SOT 5 C $1.71 View
LTC6905CS5-100#TR SOT 5 C $1.71 $1.15 View
LTC6905CS5-100#TRM SOT 5 C $1.71 $1.17 View
LTC6905CS5-100#TRMPBF SOT 5 C $1.71 $1.17 View
LTC6905CS5-100#TRPBF SOT 5 C $1.71 $1.15 View
LTC6905CS5-133 SOT 5 C $1.71 View
LTC6905CS5-133#PBF SOT 5 C $1.71 View
LTC6905CS5-133#TR SOT 5 C $1.71 $1.15 View
LTC6905CS5-133#TRM SOT 5 C $1.71 $1.17 View
LTC6905CS5-133#TRMPBF SOT 5 C $1.71 $1.17 View
LTC6905CS5-133#TRPBF SOT 5 C $1.71 $1.15 View
LTC6905CS5-80 SOT 5 C $1.71 View
LTC6905CS5-80#PBF SOT 5 C $1.71 View
LTC6905CS5-80#TR SOT 5 C $1.71 $1.15 View
LTC6905CS5-80#TRM SOT 5 C $1.71 $1.17 View
LTC6905CS5-80#TRMPBF SOT 5 C $1.71 $1.17 View
LTC6905CS5-80#TRPBF SOT 5 C $1.71 $1.15 View
LTC6905CS5-96 SOT 5 C $1.71 View
LTC6905CS5-96#PBF SOT 5 C $1.71 View
LTC6905CS5-96#TR SOT 5 C $1.71 $1.15 View
LTC6905CS5-96#TRM SOT 5 C $1.71 $1.17 View
LTC6905CS5-96#TRMPBF SOT 5 C $1.71 $1.17 View
LTC6905CS5-96#TRPBF SOT 5 C $1.71 $1.15 View
LTC6905HS5 SOT 5 H $3.25 View
LTC6905HS5#PBF SOT 5 H $3.25 View
LTC6905HS5#TR SOT 5 H $3.25 $2.44 View
LTC6905HS5#TRM SOT 5 H $3.25 $2.46 View
LTC6905HS5#TRMPBF SOT 5 H $3.25 $2.46 View
LTC6905HS5#TRPBF SOT 5 H $3.25 $2.44 View
LTC6905HS5-100 SOT 5 H $2.45 $1.67 View
LTC6905HS5-100#PBF SOT 5 H $2.45 View
LTC6905HS5-100#TR SOT 5 H $2.45 $1.73 View
LTC6905HS5-100#TRM SOT 5 H $2.45 $1.75 View
LTC6905HS5-100#TRMPBF SOT 5 H $2.45 $1.75 View
LTC6905HS5-100#TRPBF SOT 5 H $2.45 $1.73 View
LTC6905HS5-133 SOT 5 H $2.45 View
LTC6905HS5-133#PBF SOT 5 H $2.45 View
LTC6905HS5-133#TR SOT 5 H $2.45 $1.73 View
LTC6905HS5-133#TRM SOT 5 H $2.45 $1.75 View
LTC6905HS5-133#TRMPBF SOT 5 H $2.45 $1.75 View
LTC6905HS5-133#TRPBF SOT 5 H $2.45 $1.73 View
LTC6905HS5-80 SOT 5 H $2.45 View
LTC6905HS5-80#PBF SOT 5 H $2.45 View
LTC6905HS5-80#TR SOT 5 H $2.45 $1.73 View
LTC6905HS5-80#TRM SOT 5 H $2.45 $1.75 View
LTC6905HS5-80#TRMPBF SOT 5 H $2.45 $1.75 View
LTC6905HS5-80#TRPBF SOT 5 H $2.45 $1.73 View
LTC6905HS5-96 SOT 5 H $2.45 View
LTC6905HS5-96#PBF SOT 5 H $2.45 View
LTC6905HS5-96#TR SOT 5 H $2.45 $1.73 View
LTC6905HS5-96#TRM SOT 5 H $2.45 $1.75 View
LTC6905HS5-96#TRMPBF SOT 5 H $2.45 $1.75 View
LTC6905HS5-96#TRPBF SOT 5 H $2.45 $1.73 View
LTC6905IS5 SOT 5 I $2.71 View
LTC6905IS5#PBF SOT 5 I $2.71 View
LTC6905IS5#TR SOT 5 I $2.71 $2.04 View
LTC6905IS5#TRM SOT 5 I $2.71 $2.06 View
LTC6905IS5#TRMPBF SOT 5 I $2.71 $2.06 View
LTC6905IS5#TRPBF SOT 5 I $2.71 $2.04 View
LTC6905IS5-100 SOT 5 I $2.04 View
LTC6905IS5-100#PBF SOT 5 I $2.04 View
LTC6905IS5-100#TR SOT 5 I $2.04 $1.44 View
LTC6905IS5-100#TRM SOT 5 I $2.04 $1.46 View
LTC6905IS5-100#TRMPBF SOT 5 I $2.04 $1.46 View
LTC6905IS5-100#TRPBF SOT 5 I $2.04 $1.44 View
LTC6905IS5-133 SOT 5 I $2.04 View
LTC6905IS5-133#PBF SOT 5 I $2.04 View
LTC6905IS5-133#TR SOT 5 I $2.04 $1.44 View
LTC6905IS5-133#TRM SOT 5 I $2.04 $1.46 View
LTC6905IS5-133#TRMPBF SOT 5 I $2.04 $1.46 View
LTC6905IS5-133#TRPBF SOT 5 I $2.04 $1.44 View
LTC6905IS5-80 SOT 5 I $2.04 View
LTC6905IS5-80#PBF SOT 5 I $2.04 View
LTC6905IS5-80#TR SOT 5 I $2.04 $1.44 View
LTC6905IS5-80#TRM SOT 5 I $2.04 $1.46 View
LTC6905IS5-80#TRMPBF SOT 5 I $2.04 $1.46 View
LTC6905IS5-80#TRPBF SOT 5 I $2.04 $1.44 View
LTC6905IS5-96 SOT 5 I $2.04 View
LTC6905IS5-96#PBF SOT 5 I $2.04 View
LTC6905IS5-96#TR SOT 5 I $2.04 $1.44 View
LTC6905IS5-96#TRM SOT 5 I $2.04 $1.46 View
LTC6905IS5-96#TRMPBF SOT 5 I $2.04 $1.46 View
LTC6905IS5-96#TRPBF SOT 5 I $2.04 $1.44 View
LTC6905MPS5#PBF SOT 5 MP $7.02 View
LTC6905MPS5#TRMPBF SOT 5 MP $7.02 $5.09 View
LTC6905MPS5#TRPBF SOT 5 MP $5.04 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-A LTC6905 DEMO BOARD; BUFFER BOARD W/ ASSOCIATED DIP8 CLOCK BOARD. $50.00
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Applications

  • High Frequency Precision Oscillator
  • High Speed Data Bus Clock
  • Fixed Crystal Oscillator Replacement
  • Ceramic Oscillator Replacement

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Design Tools

LTspiceIV

LTspice IV 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 IV

Models for the following parts are available in LTspice IV:
LTC6905

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.

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