ANALOG DEVICES DC1446A

DC1446A demonstration circuit features the LTC6909 multiple output oscillator with spread spectrum frequency modulation (SSFM). The LTC6909 is an easy to use precision oscillator that can provide 1-, 2-, 3-, 4-, 5-, 6-, 7- or 8-phase synchronized outputs. The LTC6909 spread spectrum frequency modulation (SSFM), can be enabled to improve electromagnetic compatibility (EMC) performance. Eight separate outputs provide up to eight rail-to-rail, 50% duty cycle clock signals. Using three logic inputs, the outputs are configured for phase separation, ranging from 45° to 120° (three to eight phases). The clock outputs can also be held low or configured for Hi-Z. on-board jumpers are provided to set the LTC6909 phase inputs (PH0, PH1 and PH2) and the SSFM modulation. The on-board frequency setting resistor (RSET) is pre-loaded with a 100k surface mount resistor (in addition, two pin receptacles are provided for using a leaded RSET resistor).