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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DAC5687IPZP датащи(PDF) 42 Page - Texas Instruments |
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DAC5687IPZP датащи(HTML) 42 Page - Texas Instruments |
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42 / 72 page  www.ti.com CLK2 DA[15:0] DB[15:0] th(DATA) ts(DATA) A0 A1 A2 A3 AN AN+1 B0 B1 B2 B3 BN BN+1 B0053-02 CLK Buffer CLK Buffer PFD Charge Pump VCO /1 /2 /4 /8 00 01 10 11 1 0 /2 Data Latch 1 ´2 ´1 0 00 01 10 11 /2 /2 0 1 CLK1 CLK1C CLK2 LPF DIV[1:0] PLLVDD PLLLOCK PLLVDD D[15:0] INTERL SEL[1:0] Fdac Fdac/2 2 ´ Fdac/4 ´4 Fdac/4 ´4L Fdac/8 ´8 Data Lock CLK2C DAC5687 SLWS164B – FEBRUARY 2005 – REVISED JUNE 2005 Figure 45. Dual Bus Mode Timing Diagram (PLL Mode) Figure 46. Clock Generation Architecture in PLL Mode Power for the internal PLL blocks (PLLVDD and PLLGND) are separate from the other clock generation blocks power (CLKVDD and CLKGND), thus minimizing PLL phase noise. 3) PLLVDD = 0 V and dual_clk = 1: DUAL CLOCK MODE In DUAL CLOCK MODE, the DAC is driven at the DAC sample rate through CLK2/CLK2C and the input data rate through CLK1/CLK1C. There are two options in dual clock mode: with FIFO (inv_plllock set) and without FIFO (inv_plllock clear). If the FIFO is not used, the CLK1/CLK1C input is used to set the phase of the internal clock divider. In this case, the edges of CLK1 and CLK2 must be aligned to within ±t_align (Figure 47), defined as 42 |
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