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CDCF5801A 数据表(PDF) 5 Page - Texas Instruments |
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CDCF5801A 数据表(HTML) 5 Page - Texas Instruments |
5 / 18 page www.ti.com PLL DIVIDER/MULITPLIER SELECTION CDCF5801A SCAS816 – MARCH 2006 Table 1. Input-to-Output Settings INPUT OUTPUT PREDIVIDER POST DIVIDER INPUT-TO-OUTPUT FREQUENCY (MHz) FREQUENCY (MHz) NOTE MULTIPLICATION-RATIO FROM TO FROM TO MULT0 MULT1 P0 P1 P2 8 12.5 35 100 280 1 0 1 1 12.5 39 50 156 1 0 1 0 4 25 70 100 280 1 1 1 1 12.5 39 25 78 1 0 0 1 2 25 78 50 156 1 1 0 1 0 Normal operation(1) 50 140 100 280 0 0 1 1 25 78 25 78 1 1 0 1 1 50 156 50 156 0 0 1 0 100 240 100 240 0 1 1 1 CLKOUT high-impedance X X 0 0 CLOUOTB high-impedance CLKOUT = high X X 1 0 1 Special mode of operation CLKOUTB = high CLKOUT = P2 X X 1 X CLKOUTB = P2 (1) There is some overlapping of the input frequency ranges for multiplication ratios of 1, 2, and 4. For example, an input frequency of 30 MHz for a multiplication ratio of four falls within both the 12.5 to 39-MHz range and the 25 to 70-MHz range. For best device operation in a case such as this, always select the input frequency range nearer to the top of the table. Table 2. Power Down Modes STATE PWRDNB STOPB CLKOUT and CLKOUTB Power down 0 X GNDO Clock stop 1 0 VO, STOP Normal 1 1 See Table 1 Table 3. Programmable Delay and Phase Alignment DLYCTR NOTE LEADLAG CLKOUT and CLKOUTB Advanced by one step: For every 32 edges, there are one or two Each rising step size: 1/768 of the CLKOUT period (1.3 mUI) at P[1:2] = 11 HI edges for which the phase aligner does not edge+ 1/1536 of the CLKOUT period (0.65 mUI) at P[1:2] = 10 update the phase. Therefore, CLKOUT 1/3072 of the CLKOUT period (0.325 mUI) at P[1:2] = 01 phase is not updated for every 32nd edge. Delayed by one step: The frequency of the DLYCTRL pin should Each rising step size: 1/768 of the CLKOUT period (1.3 mUI) at P[1:2] = 11 always be equal to or less than the LO edge+ 1/1536 of the CLKOUT period (0.65 mUI) at P[1:2] = 10 frequency of the LEADLAG pin. 1/3072 of the CLKOUT period (0.325 mUI) at P[1:2] = 01 5 Submit Documentation Feedback |
类似零件编号 - CDCF5801A |
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类似说明 - CDCF5801A |
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