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TA8552AFN Datasheet(PDF) 9 Page - Toshiba Semiconductor |
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TA8552AFN Datasheet(HTML) 9 Page - Toshiba Semiconductor |
9 / 16 page TA8552AFN 2002-10-30 9 Function Description: The angular frequency (ωn) and dumping facter (ζ) are adjusted by external devices. The setting procedure is shown as following. The setting conditions to lock PLL inside a constant time; · Data transfer rate: 28.224Mbps (fM = 28.244MHz) · The capturing signal of PLL: The rectangle wave of 14.112MHz (data pattern is 101010...), The term of this data is continuous 180 bits. · The capturing time of PLL: 1 / (14.114×106) ×180 = 12.75×10-6s 12.75×10-6×0.9 = 11.5µs (this 0.9 is a factor of margin.) 【 The transfer function of PLL】 The transfer function (F (S)), the angular frequency (ωn), and the dumping facter (ζ) of the above composition are defined as following (However CL2 is ignored as CL2≪CL1): 2 1 / = w ) L1 C K ( n 2 n L1 C L R w = z 【 Calculation of ζ】 The dumping factor (ζ) is set to 0.7 as the most stable response characteristic. Besides ωn t is assumed to set as 6. Phase comparater Loop filter VCO 1 / 2 counter K0 / s Z (s) K f 1 / 2 θi θo − + CL1 CL2 RL Z (s) |
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