843034AY-01LFT

DATA SHEET PRELIMINARY Integrated ICS843034-01 FEMTOCLOCKS™ MULTI-RATE LVPECL FREQUENCYICS843034-01 Circuit F EMTOCLOCKS™ SYNTHESIZERSystems, Inc. MULTI-RATE LVPECL FREQUENCY SYNTHESIZER GENERAL DESCRIPTION FEATURES The ICS843034-01 is a general purpose, low ICS phase noise LVPECL synthesizer which can HiPerClockS™ generate frequencies for a wide variety of applications. The ICS843034-01 has a 4:1 input Multiplexer from which the following inputs can be selected: 1 differential input, 1 single-ended input, or one of two crystal oscillators, thus making the device ideal for frequency translation or generation. Each differential LVPECL output pair has an output divider which can be independently set so that two different frequencies can be generated. Additionally, each LVPECL output pair has a dedicated power supply pin so the outputs can run at 3.3V or 2.5V. The ICS843034-01 also supplies a buffered copy of the reference clock or crystal frequency on the single-ended REF_CLK pin which can be enabled or disabled (disabled by default). The output frequency can be programmed using either a serial or parallel programming interface. • Dual differential 3.3V LVPECL outputs which can be set independently for either 3.3V or 2.5V • 4:1 Input Mux: 1 differential input 1 single-ended input 2 crystal oscillator interfaces • CLK, nCLK pair can accept the following differential input levels: LVPECL, LVDS, LVHSTL, HCSL, SSTL • TEST_CLK accepts LVCMOS or LVTTL input levels • Output frequency range: 30.625MHz to 640MHz • Crystal input frequency range: 12MHz to 40MHz • VCO range: 490MHz to 640MHz • Parallel or serial interface for programming feedback divider and output dividers • RMS phase jitter at 106.25MHz, using a 25.5MHz crystal (637kHz to 5MHz): 0.61ps (typical) The ICS843034-01 has excellent