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DAC5687MPZPEP датащи(PDF) 61 Page - Texas Instruments |
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DAC5687MPZPEP датащи(HTML) 61 Page - Texas Instruments |
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61 / 75 page ![]() www.ti.com (a) X2 Mode (b) X4L Mode fDAC − MHz 0 10 20 30 40 50 60 70 80 90 0 100 200 300 400 500 G032 fDAC/2 fDAC − MHz 0 10 20 30 40 50 60 70 80 90 100 0 100 200 300 400 500 G033 fDAC/2 fDAC/4 (c) X4 Mode (d) X8 Mode fDAC − MHz 0 10 20 30 40 50 60 70 80 90 100 0 100 200 300 400 500 G034 fDAC/2 fDAC/4 fDAC x 3/4 fDAC − MHz 0 10 20 30 40 50 60 70 80 90 100 0 100 200 300 400 500 G035 fDAC/2 fDAC/4 fDAC x 3/4 fDAC/8 fDAC x 7/8 DAC5687-EP SGLS333 – JUNE 2006 Figure 71 and Figure 72 show the typical worst case spurious signal amplitudes vs fDAC for a signal frequency fSIG = 11 × fDAC/32 in each mode for PLL on (PLL clock mode) and PLL off (external and dual clock modes). Each spurious signal (fDAC/2, fDAC/4 and fDAC/8) has its own curve. The spurious signal amplitudes can then be adjusted for the exact signal frequency fSIG by applying the amplitude adjustment factor shown in Figure 73. The amplitude adjustment factor is the same for each spurious signal (fDAC/2, fDAC/4, and fDAC/8) and is normalize for fSIG = 11 × fDAC/32. Figure 71. Clock Related Spurious Signal Amplitude With PLL Off for fSIG = 11 × fDAC / 32 61 Submit Documentation Feedback |
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