VFJA922 Jitter Attenuator with 25MHz and 156.25 MHz Output Frequencies Features RoHS Status 2 LVCMOS outputs at 25 MHz 1 LVPECL output at 156.25 MHz Ultra Low Jitter 0.25ps RMS Free-run mode No external components required Applications Synchronous Ethernet Description The VFJA922 is a Jitter Attenuator that provides two LVCMOS outputs at 25MHz and one LVPECL output at 156.25 MHz. 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 nominal output frequency and is not locked to the input reference clock. The VFJA922 is available in a 19.5 mm x 15.5 mm surface mount package. Filter Fout 1 F in R-Divider VCXO PFD Fout 2 Sel N- Divider Multiplier Fout 3 Block Diagram 75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • www.valpeyfisher.com • Rev_1014 1 VFJA922 Jitter Attenuator with 25MHz and 156.25 MHz Output Frequencies Absolute Maximum Ratings Parameter Supply Break Down Voltage Storage Temperature Symbol Condition Min Typ Max Unit Vcc -0.5 +4.6 V Ts -55 +95 C Electrical Specifications 75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • www.valpeyfisher.com • Rev_1014 2 Note VFJA922 Jitter Attenuator with 25MHz and 156.25 MHz Output Frequencies Parameter Output Frequency Output Frequency Symbol Fout 1 Fout 2 Input Frequency Fin Input Level Fout 1 & 2 Output Level Logic “1” Fout 1 & 2 Output Level Logic “0” Fout 3 Output Level Logic “1” Fout 3 Output Level Logic “0” Condition Min Fout 3 Typ Max Unit 25.0 MHz 156.25 MHz 25.0 MHz Vin Slew Rate 2.5V / ns (min) AC coupled internally 0.4 3.3 V p-p Voh 1,2 IOH = 8 mA Vcc-.1 Vcc V Vol 1,2 IOL = 8 mA 0.0 0.3 V Vcc-1.145 Vcc-0.845 V Vcc-1.945 Vcc-1.645 V Voh 3 50 Ohm to Vcc-2V or Thevenin Equivalent Vol 3 0.3 Jitter RMS 12KHz to 20MHz SSB Phase Noise 100Hz 1KHz 10KHz 100KHz Фn 0.3 -120 -140 -150 -160 100 APR Free-run Accuracy Modulation BW -40ºC to +85ºC Duty Cycle @ 50% Rise / Fall Time Note Tr/Tf Select Input Sel Supply Voltage Vcc Input Current Operating Temperature Range Icc dBc/Hz @ 25 MHz ppm 10 Start up time @ 25 MHz @ 156.25MHz ppm 60 45 ps Hz 50 20% to 80% 55 % 0.6 ns 2 3 s Logic “1”( > 2.5 V) = Free Run Mode Logic “0”( < .4 V) = External Input Reference 3.15 3.30 3.45 V 100 Ta -40 130 mA +85 C 75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • www.valpeyfisher.com • Rev_1014 3 Table 1 VFJA922 Jitter Attenuator with 25MHz and 156.25 MHz Output Frequencies 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 260C for 10s max Hermetic Seal Leak rate less than 5x10-8 atm.cc/s of helium (crystal only) Pin Assignments Connection Diagram Vcc = 3.3V C1 .1 uF Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Vcc=3.3V 4, 13 11 C2 .1 uF Fout 1 Fin 1 6 Sel 3 7 Fout 2 R1 180 Ω Fout 3 10 Description Fin Gnd Sel Vcc Gnd Fout 1 Fout 2 Gnd nFout 3 Fout 3 Vcc N/C Vcc Gnd 9 nFout 3 2, 5, 8, 14 R2 180 Ω Gnd Table 1 Sel 0 1 Input Frequency (MHz) 25.00 MHz Free-run Mode Output Frequency (MHz) 25.00 & 156.25 25.00 & 156.25 75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • www.valpeyfisher.com • Rev_1014 4 VFJA922 Jitter Attenuator with 25MHz and 156.25 MHz Output Frequencies Mechanical Outline Recommended Pad Layout 75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • www.valpeyfisher.com • Rev_1014 5