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XRT8020 Datasheet(PDF) 6 Page - Exar Corporation |
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XRT8020 Datasheet(HTML) 6 Page - Exar Corporation |
6 / 12 page XRT8020 REV. 1.0.2 650 MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS 5 FIGURE 3. LVDS OUTPUT WAVEFORMS AND TEST CIRCUITS 1.0 CALIBRATION TABLE 1: FREQUENCY SELECTION TABLE FS0 PIN 10 FS1 PIN 9 CRYSTAL OR CLOCK FREQUENCY INTERNAL CAPACITOR MULTIPLY RATIO OUTPUT DIVIDE OUTPUT FREQUENCY 1 1 78.0 MHz Clock NA 8x 1 624 MHz 0 1 39.0 MHz 12 pF 16x 1 624 MHz 1 0 19.5 MHz 20 pF 32x 1 624 MHz 0 0 19.5 MHz 20 pF 32x 2 312 MHz NOTES: 1. Use Parallel Fundamental mode crystal 2. FS0 has an internal 50K Ω pull-up resistor to VDD 3. FS1 has an internal 50K Ω pull-down resistor to GND TABLE 2: POWER-DOWN AND OUTPUT TRI-STATE SELECTION TABLE PD PIN 8 OE PIN 7 STATUS NOTES: 1 X Outputs tri-stated and chip Powered-down 1. “X" = Don't care 2. PD and OE have an internal 50K Ω pull-down resis- tor to ground. 0 1 Output tri-stated V OUT C L =5 pF C L =5 pF R L = 100Ω OUTP OUTN V OUT V CM OUTP OUTN 50 Ω 50 Ω LDVS Levels Test Circuit LDVS Switching Test Circuit OUTP OUTN T R T F 80% 20% 80% 20% 0V VCM (Differential) LDVS Transition Time Waveform 0V (Differential) VOUT 50% 50% t skew |
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Similar Description - XRT8020 |
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