The user can specify a fixed integer multiple of the reference clock to lock onto using CTRLA[5:2], where CTRLA should be set to the data rate/DIV_FREF, where DIV_FREF represents the divided-down reference referred to the 10 MHz to 20 MHz band. For example, if the reference clock frequency is 38.88 MHz and the input data rate is 622.08 Mb/s, then CTRLA[7:6] is set to [01] to give a divided-down reference clock of 19.44 MHz. CTRLA[5:2] is set to [0101], that is, 5, because 622.08 Mb/s/19.44 MHz = 25 In this mode, if the ADN2816 loses lock for any reason, it relocks onto the reference clock and continues to output a stable clock
While the ADN2816 is operating in lock-to-reference mode, if the user ever changes the reference frequency, the FREF range (CTRLA[7:6]) or the FREF ratio (CTRLA[5:2]), this must be followed by writing a 0 to 1 transition into the CTRLA[0] bit to initiate a new lock-to-reference command
Using the Reference Clock to Measure Data Frequency
The user can also provide a reference clock to measure the recovered data frequency. In this case, the user provides a reference clock, and the ADN2816 compares the frequency of the incoming data to the incoming reference clock and returns a ratio of the two frequencies to 0.01% (100 ppm). The accuracy error of the reference clock is added to the accuracy of the ADN2816 data rate measurement. For example, if a 100 ppm accuracy reference clock is used, the total accuracy of the measurement is within 200 ppm.
The reference clock can range from 10 MHz and 160 MHz.
The ADN2816 expects a reference clock between 10 MHz and 20 MHz by default. If it is between 20 MHz and 40 MHz, 40 MHz and 80 MHz, or 80 MHz and 160 MHz, the user needs to configure the ADN2816 to use the correct reference frequency range by setting two bits of the CTRLA register, CTRLA[7:6]. Using the reference clock to determine the frequency of the incoming data does not affect the manner in which the part locks onto data. In this mode, the reference clock is used only to determine the frequency of the data. For this reason, the user does not need to know the data rate to use the reference clock in this manner.
Company introduction
Temporal Ming sheng automation equipment co., LTD. Was established in April 02, 2021, registered jiujiang ruichang city in jiangxi province, east yi road no. 23 lake farmers 401 mall, the legal representative person Zhou Zuochen.
[Main Products]
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