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42781AG-08TT Datasheet(PDF) 2 Page - PulseCore Semiconductor |
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42781AG-08TT Datasheet(HTML) 2 Page - PulseCore Semiconductor |
2 / 11 page October 2006 P2781/82/84 rev 1.6 General Purpose EMI Reduction IC 2 of 11 Notice: The information in this document is subject to change without notice. Pin Configuration Pin Description (P278xA) Pin# Pin Name Type Description 1 XIN/CLKIN I Connect to crystal or clock input. This pin has dual functions. It can be connected either to an external crystal or an external reference clock. 2 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected. 3 FS1 I Digital logic input used to select input frequency range (see the Input Frequency Selection Table). This pin has an internal pull-up resistor. 4 LF I External Loop Filter for the PLL. By changing the value of the CRC circuit, the percentage spread can be adjusted accordingly. See the Loop Filter Selection Table for detail value. 5 VSS I Ground Connection. Connect to system ground. 6 ModOUT O Spread Spectrum Clock Output. 7 FS0 I Digital logic input used to select input frequency range (see the Input Frequency Selection Table). This pin has an internal pull-up resistor. 8 VDD P Connect to +3.3 V Input Frequency Selection Table Output Frequency Scaling (MHz) FS1 FS0 Input (MHz) P2781A P2782A P2784A Modulation Rate (KHz) 0 0 3 to 9 3 to 9 6 to 18 12 to 36 Fin / 128 0 1 10 to 19 10 to 19 20 to 38 40 to 76 Fin / 256 1 0 20 to 38 20 to 38 40 to 76 80 to 152 Fin / 512 1 1 39 to 78 39 to 78 78 to 156 156 to 312 Fin / 1024 Standard pin Configuration offered in both 8 pin SOIC and TSSOP Packages FS1 LF FS0 VDD VSS 1 2 3 4 5 6 7 8 P278xA XIN / CLKIN ModOUT XOUT |
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