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## DS1086L Datasheet(HTML) 13 Page - Maxim Integrated Products

 13 / 16 page3.3V Spread-Spectrum EconOscillator____________________________________________________________________13The expected output frequency is not exactly equal to thedesired frequency of 11.0592MHz. The difference is450Hz. In terms of percentage, Equation 6 shows that theexpected error is 0.004%. The expected error assumestypical values and does not include deviations from thetypical as specified in the electrical tables.Example #2: Calculate the register values needed togenerate a desired output frequency of 50MHz.Since the desired frequency is already within the validmaster oscillator frequency range, the prescaler is setto divide by 1, and hence, PRESCALER = 0000h(currently ignoring the other setting).fMASTER OSCILLATOR = 50.0MHz x 20 = 50.0MHzNext, looking at Table 2, OS + 1 provides a range offrequencies centered around the desired frequency. Todetermine what value to write to the OFFSET register,the RANGE register must first be read. Assuming 12hwas read in this example, 13h (OS + 1) is written to theOFFSET register.Finally, the DAC value is calculated as shown inEquation 8.The result is then converted to hex (0118h) and thenleft-shifted, resulting in 4600h to be programmed intothe DAC register.In summary, the DS1086L is programmed as follows:PRESCALER = 0000hOFFSET = OS + 1 or 13h (if RANGE was read as 12h)DAC = 4600hSince the expected output frequency is equal to thedesired frequency, the calculated error is 0%.fMHzkHzMHzMHzOUTPUT(.)()..=+×==48 62805250 0150 00DAC VALUEMHzMHzkHz STEP SIZEdecimal(..).()=−=50 048 65280 00%%.....%ERRORfffERRORMHzMHzMHzHzMHzEXPECTEDDESIREDEXPECTEDDESIREDEXPECTED=−×=−×=×=10011 059211 0587511 059210045011 05921000 004STOPCONDITIONOR REPEATEDSTARTCONDITIONREPEATED IF MORE BYTESARE TRANSFERREDACKSTARTCONDITIONACKACKNOWLEDGEMENTSIGNAL FROM RECEIVERACKNOWLEDGEMENTSIGNAL FROM RECEIVERSLAVE ADDRESSMSBSCLSDAR/WDIRECTIONBIT12678912893–7Figure 4. 2-Wire Data Transfer Protocol(6)(7)(8)(9)

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