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ML145145 bảng dữ liệu(PDF) 9 Page - LANSDALE Semiconductor Inc. |
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ML145145 bảng dữ liệu(HTML) 9 Page - LANSDALE Semiconductor Inc. |
9 / 12 page www.lansdale.com Page 9 of 12 LANSDALE Semiconductor, Inc. ML145145 RECOMMENDED READING Technical Note TN–24, Stated Corp. Technical Note TN–\7, Stated Corp. E. Hafner, “The Piezoelectric Crystal Unit – Definitions and Method of Measurement”, Proc IEEE, Vol. 57, No. 2 Feb., 1969 D. Kemper, L. Rosine, “Quartz Crystals for Frequency Control”, Electro–Technology, June, 1969. P.J. Ottowitz, “A Guide to Crystal Selection”, Electronic Design, May, 1966. LEGACY APPLICATIONS The features of the ML145145 permit bus operation with a dedicated wire needed only for the strobe input. In a micro- processor–controlled system this strobe input is accessed when the PLL is addressed. The remaining data and address inputs will directly interface to the microprocessor’s data and address buses. The ÷ R programability is used to advantage in Figure 10. Here, the nominal ÷ R value is 3667, but by programming small changes in this value, fine tuning is accomplised. Better tuning resolution is achievable with this method than by chang- ing the ÷ N due to the use of the large fixed prescaling value of ÷ 256 provided by the ML12079. The two–loop synthesizer, in Figure 11, takes advantage of these features to control the phase–locked loop with a minu- mum of dedicated lines while preserving optimal loop per- formance. Both 25 Hz and 100 Hz steps are provided while the relatively large reference frequencies of 10 Khz or 10.1 kHz are maintained. Issue b |
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