VFJA911 25 MHz Jitter Attenuator LVPECL Output Features ¾ ¾ ¾ ¾ ¾ RoHS Status LVPECL output Ultra Low Jitter: 0.25ps RMS Phase Noise: -138 dBc/Hz @ 1KHz Free-run mode No external components required Applications ¾ Synchronous Ethernet Description The VFJA911 is a Jitter Attenuator that provides an LVPECL output with a frequency of 25MHz. With less than 0.4 dBc of jitter peaking the device allows for cascading multiple stages within the network. A select input [Sel] allows the user to switch from the external input reference to a free-run mode. In free-run mode the device outputs a 25MHz clock that is not locked to the input reference frequency. Operating with a +3.3 volt power supply the device typically consumes 135mW. The VFJA911 is available in a 15.0mm x 13.0mm surface mount package. Filter Fout F in R-Divider VCXO PFD nFout OD Sel N- Divider Block Diagram 75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • www.valpeyfisher.com • RevA0508 1 VFJA911 25 MHz Jitter Attenuator LVPECL Output Absolute Maximum Ratings Parameter Supply Break Down Voltage Storage Temperature Symbol Condition Min Typ Max Unit Vcc -0.5 5.5 V Ts -55 +105° °C Note Electrical Specifications Parameter Output Frequency Range Input Frequency Range Input Level Output Level Logic “1” Output Level Logic “0” Jitter RMS Symbol SSB Phase Noise Фn APR Free-run Accuracy Modulation BW Duty Cycle Rise / Fall Time Start up time Condition Min Fout Slew Rate 2.5V / ns (min) Vin AC coupled internally Vol Max 25.0 Fin Voh Typ MHz 0.4 3.3 V p-p Vcc-0.96 Vcc-0.81 V Vcc-1.85 Vcc-1.65 V 12KHz to 20MHz 100Hz 1KHz 10KHz 100KHz 0.25 -118 -138 -145 -153 ps dBc/Hz ± 100 -40ºC to +85ºC ppm 30 Tr/Tf Select Input Sel Output Disable Supply Voltage Input Current Operating Temperature Range OD 45 @ 25 MHz ppm 60 @ 50% Note MHz 25.0 50 Ohm to Vcc-2V or Thevenin Equivalent Unit Hz 50 20% to 80% 55 % 0.6 ns Note 1 2 10 ms Logic “1” = Free Run Mode Logic “0” = External Input Reference Logic “1” = Output Disabled Logic “0” or Floating = Output Enabled Vcc 3.15 Icc 3.30 40 Ta -40° 3.45 V 45 mA +85° °C 75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • www.valpeyfisher.com • RevA0508 2 LVCMOS LVCMOS VFJA911 25 MHz Jitter Attenuator LVPECL Output Environmental and Mechanical Parameter Mechanical Shock Thermal Shock Specification Per MIL-STD-202, Method 213, Condition E Per MIL-STD-883, Method 1011, Condition A Vibration Per MIL-STD-883, Method 2007, Condition A Soldering Conditions 260°C for 10s max Hermetic Seal -8 Leak rate less than 5x10 atm.cc/s of helium (crystal only) Mechanical Outline Connection Diagram Vcc = +3.3V OD .1 uF 9 4 8 .1 uF Fin 1 7 Fout 1 Sel 3 6 Fout 2 5 10 Gnd Pin # 1 2 3 4 5 6 7 8 9 10 Description Fin N/C Sel Vcc Gnd nFout Fout Output Disable Vcc Gnd Sel 0 1 Input Frequency (MHz) 25.00 MHz Free-run Mode Output Frequency (MHz) 25.00 25.00 Table 1 75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • www.valpeyfisher.com • RevA0508 3