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AD808 Folha de dados(PDF) 8 Page - Analog Devices |
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AD808 Folha de dados(HTML) 8 Page - Analog Devices |
8 / 12 page REV. 0 –8– AD808 1 2 5 6 7 3 4 8 VEE SDOUT NIN AVCC1 THRADJ AVEE AD808 PIN 16 15 12 11 10 14 13 9 R10 154 R9 154 R6 100 C7 R5 100 R1 100 R2 100 C1 0.1 F DATAOUTN DATAOUTP CLKOUTN CLKOUTP C5 0.1 F C2 0.1 F R4 100 R8 100 R7 100 R3 100 C8 R12 154 TP1 TP2 R11 154 CD TP7 SDOUT TP5 TP6 RTHRESH C11 10 F C10 GND R14 49.9 R15 49.9 C12 0.1 F C4 0.1 F C3 0.1 F C6 0.1 F J1 J2 J3 J4 +5V TP3 TP4 NOTE: INTERCONNECT RUN UNDER DUT VECTOR PINS SPACED FOR RN55C TYPE RESISTOR; COMPONENT SHOWN FOR REFERENCE ONLY VECTOR PINS SPACED THROUGH-HOLE CAPACITOR ON VECTOR CUPS; COMPONENT SHOWN FOR REFERENCE ONLY TP8 J5 C9 R13 301 R16 3.65k J6 J7 C13 0.1 F C14 0.1 F PIN NIN 50 STRIP LINE EQUAL LENGTH NOTE: C7–C10 ARE 0.1µF BYPASS CAPACITORS RIGHT ANGLE SMA CONNECTOR OUTER SHELL TO GND PLANE ALL RESISTORS ARE 1% 1/8 WATT SURFACE MOUNT TPxo TEST POINTS ARE VECTORBOARD K24A/M PINS DATAOUTN DATAOUTP VCC2 CLKOUTN CLKOUTP VCC1 CF1 CF2 AVCC2 Figure 15. Evaluation Board Schematic Center Frequency Clamp (Figure 13) An N-channel FET circuit can be used to bring the AD808 VCO center frequency to within ±10% of 622 MHz when SDOUT indicates a Loss of Signal (LOS). This effectively re- duces the frequency acquisition time by reducing the frequency error between the VCO frequency and the input data frequency at clamp release. The N-FET can have “on” resistance as high as 1 k Ω and still attain effective clamping. However, the chosen N-FET should have greater than 10 M Ω “off” resistance and less than 100 nA leakage current (source and drain) so as not to alter normal PLL performance. 1 2 5 6 7 3 4 8 16 15 12 11 10 14 13 9 VEE SDOUT AVCC2 PIN NIN AVCC1 THRADJ AVEE DATAOUTN DATAOUTP CLKOUTN CLKOUTP VCC1 CF1 CF2 VCC2 AD808 N_FET CD Figure 13. Center Frequency Clamp Schematic RBW: 30Hz ST: 3.07 min RANGE: R= 0, T= 0dBm DIV 20.00m CD PEAK 0.047 0.11 0.10 0.07 0.47 0.04 DIV 36.00m START STOP 500.000Hz 100 000.000Hz Figure14. Jitter Transfer vs. CD |
Nº de peça semelhante - AD808 |
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Descrição semelhante - AD808 |
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