LTC6902 Datasheet | Linear Technology

LTC6902 Multiphase Oscillator with Spread Spectrum Frequency Modulation Features 2-, 3- or 4-Phase Outputs s Optional Spread Spectrum Frequency Modulation for Improved EMC Performance s 5k Hz to 20MHz Frequency Range .. s One External Resistor Sets the Frequency s One External Resistor Sets Percent Frequency Spreading s 400µA Typical Supply Current, V = 3V, 1MHz S s Frequency Error ≤ 1.5% Max, 5k Hz to 10MHz (TA = 25°C) s Frequency Error ≤ 2% Max, 5k Hz to 10MHz (TA = 0°C to 70°C) s ± 40ppm/°C Temperature Stability s Fast Start-Up Time: 50µs to 1.5ms s 100Ω CMOS Output Driver s Operates from a Single 2.7V to 5.5V Supply s Available in 10-Lead MS Package s DESCRIPTIO The LTC®6902 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 100k Hz and 20MHz. In order to acmodate 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 patibility (EMC) performance. The amount of frequency spreading is programmable by a single additional external resistor (RMOD) and is disabled by grounding the MOD pin. , LTC and LT are registered trademarks of Linear Technology Corporation. U APPLICATIO S s s s s s Switching Power Supply Clock Reference Portable and Battery-Powered Equipment PDAs Cell Phones...