Features and Benefits
- 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
- AEC-Q100 Qualified for Automotive Applications
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 fixed 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.
- Switching Power Supply Clock Reference
- Portable and Battery-Powered Equipment
- Precision Programmable Oscillator
- Charge Pump Driver
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
DC2073B demo board features Linear Technology's SOT23 packaged silicon oscillators. The DC2073B demo board is available in eleven different options: DC2073B-A through DC2073B-K. These eleven options provide for the evaluation of resistor-set oscillator ICs and fixed frequency ICs.
DC2073B demo board features Linear Technology's SOT23 packaged silicon oscillators. The DC2073B demo board is available in eleven different options; DC2073B-A through DC2073B-K. These eleven options provide for the evaluation of resistor-set oscillator ICs and fixed frequency ICs.
Documentation & Resources
R494 Reliability Data3/22/2018
Reducing Noise by Synchronizing Switching Regulators4/4/2022
Spread Spectrum Frequency Modulation Reduces EMI11/4/2015
Dual Output µModule DC/DC Regulator Produces High Efficiency 4A Outputs from a 4.5V to 26.5V Input12/1/2009 LT Journal
High Power, Single Inductor, Surface Mount Buck-Boost µModule Regulators Handle 36VIN, 10A Loads3/1/2008 LT Journal
Internal 2A, 42V Switch, Adjustable 2.5MHz Operating Frequency and 3mm × 3mm Package Allow Boost Regulator to Fit Numerous Applications1/1/2008 LT Journal
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTC6908-1 Companion Parts
Recommended Related Parts
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Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.