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CDCE401YS Arkusz danych(PDF) 9 Page - Texas Instruments |
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CDCE401YS Arkusz danych(HTML) 9 Page - Texas Instruments |
9 / 19 page www.ti.com REGISTER DESCRIPTION CDCE401 SCAS820 – JUNE 2006 WORD 0: BIT NAME DESCRIPTION/FUNCTION TYPE DEFAULT 0 C0 Register selection W 0 1 C1 Register selection W 0 2 CXI0 Load capacitance XIN, bit 0 W 0 3 CXI1 Load capacitance XIN, bit 1 W 0 4 CXI2 Load capacitance XIN, bit 2 W 0 5 CXI3 Load capacitance XIN, bit 3 W 0 6 CXI4 Load capacitance XIN, bit 4 W 0 7 CXI5 Load capacitance XIN, bit 5 W 1 8 CXI6 Load capacitance XIN, bit 6 W 1 9 CXI7 Load capacitance XIN, bit 7 W 0 WORD 1: BIT NAME DESCRIPTION/FUNCTION TYPE DEFAULT 0 C0 Register selection W 1 1 C1 Register selection W 0 2 CXO0 Load capacitance XOUT, bit 0 W 0 3 CXO1 Load capacitance XOUT, bit 1 W 0 4 CXO2 Load capacitance XOUT, bit 2 W 0 5 CXO3 Load capacitance XOUT, bit 3 W 0 6 CXO4 Load capacitance XOUT, bit 4 W 0 7 CXO5 Load capacitance XOUT, bit 5 W 1 8 CXO6 Load capacitance XOUT, bit 6 W 1 9 CXO7 Load capacitance XOUT, bit 7 W 0 WORD 2: BIT NAME DESCRIPTION/FUNCTION TYPE DEFAULT 0 C0 Register selection W 0 1 C1 Register selection W 1 2 PD0 Post-divider selection, bit 0 W 0 3 PD1 Post-divider selection, bit 1 W 0 4 PD2 Post-divider selection, bit 2 W 0 5 OG0 Oscillator gain definition, bit 0(1) W 1 6 OG1 Oscillator gain definition, bit 1(1) W 1 7 OP0 Oscillator operating-point adjustment, bit 0(1) W 0 8 OP1 Oscillator operating-point adjustment, bit 1(1) W 0 9 OP2 Oscillator operating-point adjustment, bit 2(1) W 0 (1) The oscillator gain bits have impact on the capacitance CBASE. See the table for input capacitance values. The oscillator operating-point bits OP[2:0] are used to set the bias point of the oscillator core stage. In combination with setting the post-divider ratio PD[2:0] = 111, the current consumption can be optimized to set oscillator core current consumption for lower frequencies and higher frequencies. This ensures that the oscillator core is in operating optimally for phase noise and low XTAL-drive power. Setting core power too high impacts XTAL-drive power, which affects the lifetime of the crystal. 9 Submit Documentation Feedback |
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