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LTC6908 2-Output Precision Oscillator

By Linear Technology 42

LTC6908 2-Output Precision Oscillator

ADI’s LTC6908 is a 2-output precision oscillator 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 2.7 V to 5.5 V supply and provides rail-to-rail, 50% duty cycle square-wave outputs. A single resistor from 10 k to 2 M is used to select an oscillator frequency from 50 kHz to 10 MHz (5 V supply). The oscillator can be easily programmed using the simple formula:

fOUT = 10 MHz • 10 k/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. The LTC6908 is ideal for switching power supplies, battery equipment, and charge pump drivers.


  
Features
  • LTC6908-1: complementary outputs (0°/180°)
  • LTC6908-2: quadrature outputs (0°/90°)
  • 50 kHz to 10 MHz frequency range
  • One external resistor sets the frequency
  • Optional spread spectrum frequency modulation for improved EMC performance
  • ±10% frequency spreading
  • 400 µA supply current typical (V+ = 5 V, 50 kHz)
  • Frequency error ≤1.5% max. (TA = 25°C, V+ = 3 V)
  • ±40 ppm/°C temperature stability
  • Fast start-up time: 260 µs typical (1 MHz)
  • Outputs muted until stable
  • Operates from a single 2.7 V to 5.5 V supply
  • Available in ThinSOT and DFN packages
Applications
  
  • Switching power supply clock reference
  • Portable and battery-powered equipment
  
  • Precision programmable oscillator
  • Charge pump driver

नयाँ सामानहरू:

DC2073A-JDC2073B-JDC2073B-KLTC6908CS6-1#TRMPBFLTC6908IDCB-2#TRMPBFLTC6908HS6-1#TRMPBFLTC6908CS6-2#TRMPBFLTC6908CDCB-1#TRMPBFLTC6908HS6-2#TRMPBFLTC6908IS6-1#TRMPBF

ट्यागहरू:

Timing & Clock ManagementSemiconductors & Dev ToolsLinear Technology

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