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Typical control systems refer to the acquisition time or lock time as the reaction time of Decode Freescale MC68HC711EA9 Heximal Program, within specified tolerances, to a step input. In a PLL, the step input occurs when the PLL is turned on or when it suffers a noise hit.

The tolerance is usually specified as a percentage of the step input or when the output settles to the desired value plus or minus a percentage of the frequency change. Therefore, the reaction time is constant in this definition, regardless of the size of the step input. For example, consider a system with a 5% acquisition time tolerance.

If a command instructs the system to change from 0Hz to 1MHz, the acquisition time is the time taken for the frequency to reach 1MHz ± 50kHz. 50kHz = 5% of the 1MHz step input. If the system is operating at 1MHz and suffers a –100kHz noise hit, the acquisition time is the time taken to return from 900kHz to 1MHz ± 5kHz. 5kHz = 5% of the 100kHz step input.

Decode Freescale MC68HC711EA9 Heximal Program

Other systems refer to acquisition and lock times as the time the system takes to reduce the error between the actual output and the desired output to within specified tolerances.

Therefore, the acquisition or lock time varies according to the original error in the output. Minor errors may not even be registered. Typical PLL applications prefer to use this definition because the system requires the output frequency to be within a certain tolerance of the desired frequency regardless of the size of the initial error.