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LTC6908 2-Output Precision Oscillator

Analog Devices’ time devices for switching power supplies, battery equipment, and charge pump drivers

Image of Linear Technologies' LTC6908 Precision OscillatorADI’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.

Image of Linear Technologies' LTC6908 Precision Oscillator
  Image of Linear Technologies' LTC6908 Precision Oscillator
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

LTC6908 Precision Oscillator Eval Board

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
DEMO BOARD OSC PROGRAMABLEDC2073A-JDEMO BOARD OSC PROGRAMABLE0View Details
LTC6908-1 SILICON OSCILLATOR DEMDC2073B-JLTC6908-1 SILICON OSCILLATOR DEM2 - ImmediateView Details
LTC6908-2 SILICON OSCILLATOR DEMDC2073B-KLTC6908-2 SILICON OSCILLATOR DEM16 - ImmediateView Details

LTC6908 Precision Oscillator ICs

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC OSC SILICON PROG TSOT23-6LTC6908CS6-1#TRMPBFIC OSC SILICON PROG TSOT23-66072 - ImmediateView Details
IC OSC SILICON PROG 6-DFNLTC6908IDCB-2#TRMPBFIC OSC SILICON PROG 6-DFN561 - ImmediateView Details
IC OSC SILICON PROG TSOT23-6LTC6908HS6-1#TRMPBFIC OSC SILICON PROG TSOT23-65696 - ImmediateView Details
IC OSC SILICON PROG TSOT23-6LTC6908CS6-2#TRMPBFIC OSC SILICON PROG TSOT23-6561 - ImmediateView Details
IC OSC SILICON PROG 6-DFNLTC6908CDCB-1#TRMPBFIC OSC SILICON PROG 6-DFN1922 - ImmediateView Details
IC OSC SILICON PROG TSOT23-6LTC6908HS6-2#TRMPBFIC OSC SILICON PROG TSOT23-6514 - ImmediateView Details
IC OSC SILICON PROG TSOT23-6LTC6908IS6-1#TRMPBFIC OSC SILICON PROG TSOT23-60View Details
Published: 2018-08-15