Spread Spectrum Clock suits switching regulators.
May 30, 2006 -
Using single resistor, Model LTC6908 is programmable to any frequency from 50 kHz to 10 MHz. Outputs of version LT6908-1 are 180° out of phase while outputs of LTC6908-2 model are 90° out of phase. In event that switcher bandwidth is limited, oscillator's modulation rate can be adjusted to 1 of 3 settings. Housed in 2 x 3 mm, 6-lead ThinSOT(TM) package, Model LTC6908 features 2.7-5.5 V operation and is specified over temperature range of -40 to 125°C.
Original Press release
Linear Technology Corp.
1630 McCarthy Blvd.
Milpitas, CA, 95035
SOT-23 Spread Spectrum Clock for Switching Regulators
MILPITAS, CA - April 10, 2006 - Linear Technology Corporation announces the LTC6908, a tiny spread spectrum silicon oscillator optimized for switching regulators. Using a single resistor, the LTC6908 is programmable to any frequency from 50kHz to 10MHz. The LTC6908 comes in two configurations, each with dual outputs. The LT6908-1's outputs are 180° out of phase and the LTC6908-2's outputs are 90° out of phase.
Enabling the pseudo-random spread-spectrum provides a simple, effective way to reduce EMI. In the event that the switcher bandwidth is limited, the LTC6908 modulation rate can be adjusted to one of three settings. "Implementing spread-spectrum for switchers is now trivial" says Doug LaPorte, design section lead for Linear Technology. "The user sets the frequency with one resistor and selects a modulation rate."
Fully specified over the temperature range of -40°C to 125°C, the LTC6908 offers the same outstanding features available with Linear Technology's silicon oscillator family; rugged and reliable operation under extreme conditions, fast startup and low power consumption. These parts are available in a compact 6-lead ThinSOT(TM) package and a 2mm x 3mm DFN. The LTC6908 is in full production with prices starting at $1.65 each in 1,000-piece quantities.
Summary of Features: LTC6908
LTC6908-1: Complementary Outputs (0°/180°)
LTC6908-2: Quadrature Outputs (0°/90°)
50kHz to 10MHz Frequency Range
One Resistor Sets the Frequency
Optional ±10% Frequency Spreading
Frequency Error less than or equal to 1.5% Max
±40ppm/°C Temperature Stability
Operating Temperature Range: -40°C to 125°C
Fast Start-Up Time: <1.5ms
Outputs Muted Until Stable
2.7V to 5.5V Operation
Available in Low Profile ThinSOT and DFN (2mm x3mm) Packages
Tiny Clock Optimized for Switchers
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems. For more information, visit www.linear.com.
LT and LTC are registered trademarks and ThinSOT is a trademark of Linear Technology Corp.
North America and General Information
Tel: (408) 432-1900 ext. 2419
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