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NB2779A Datasheet(PDF) 2 Page - ON Semiconductor |
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NB2779A Datasheet(HTML) 2 Page - ON Semiconductor |
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2 / 8 page  NB2779A http://onsemi.com 2 Figure 1. Block Diagram ModOUT Crystal Oscillator Frequency Divider Feedback Divider Phase Detector Loop Filter XIN/CLKIN XOUT Modulation VDD VCO Output Divider PLL VSS PD Table 1. KEY SPECIFICATIONS Description Specification Supply Voltages VDD = 3.3 V / 2.5 V Frequency Range For 2.5 V Supply For 3.3 V Supply 13 MHz < CLKIN < 30 MHz 13 MHz < CLKIN < 30 MHz Cycle−to−Cycle Jitter 200 ps (maximum) Output Duty Cycle 45/55% (worst case) Modulation Rate Equation FIN/640 Frequency Deviation "1% (TYP) @ 16 MHz VDD 1 2 3 6 5 4 XOUT XIN/CLKIN ModOUT NB2779A VSS PD Figure 2. Pin Configuration Table 2. PIN DESCRIPTION Pin # Pin Name Type Description 1 PD I Powerdown control pin. Pull low to enable powerdown mode. Connect to VDD if not used. 2 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected. 3 XIN/CLKIN I Crystal connection or external reference frequency input. This pin has dual functions. It can be connected either to an external crystal or an external reference clock. 4 VDD P Power supply for the entire chip. 5 ModOUT O Spread spectrum clock output. 6 VSS P Ground connection. |
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