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P2027AG-08TR Datasheet(PDF) 2 Page - ON Semiconductor |
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P2027AG-08TR Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 7 page P2027A http://onsemi.com 2 VCO PLL VSS ModOUT VDD Output Divider Loop Filter XIN XOUT Crystal Oscillator Frequency Divider Feedback Divider Phase Detector Modulation MRA SR0 SSON Figure 1. Block Diagram Table 1. PIN DESCRIPTION Pin# Pin Name Type Description 1 XIN / CLKIN I Crystal connection or external reference frequency input. This pin has dual functions. It can be connected to either an external crystal or an external reference clock. 2 XOUT O Crystal connection. Input connection for an external crystal. If using an external reference, this pin must be left unconnected. 3 MRA I Digital logic input used to select Modulation Rate (see Table 2). This pin has an internal pull−up resistor. 4 VSS P Ground Connection. Connect to system ground. 5 SSON I Digital logic input used to enable Spread Spectrum function (Active Low). Spread Spectrum function enable when low. This pin has an internal pull−low resistor. 6 ModOUT O Spread Spectrum Clock Output. 7 SR0 I Digital logic input used to select Spreading Range (see Table 2). This pin has an internal pull−up resistor. 8 VDD P Connect to +3.3 V Power Supply. Table 2. MODULATION AND SPREADING SELECTION MRA SR0 Spread Range Modulation Rate 0 0 Reserve Reserve 0 1 ±0.30% (Fin/10)*34.72 KHz 1 0 ±0.20% (Fin/10)*20.83 KHz 1 1 ±0.60% (Fin/10)*20.83 KHz |
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