1. Identify sampling-edge uncertainty
A sampling edge identifies the time at which the converter captures the input. If that edge occurs earlier or later than intended, a changing input can have a different amplitude at the instant captured. ADI uses this relationship to explain aperture-jitter noise. The relevant disturbance is uncertainty about timing, rather than a separate change deliberately applied to the analog signal.
This gives the clock question a specific connection to the input waveform. The same input is being observed at slightly different instants, so its rate of change matters to the amplitude difference. A clock description that omits the input context leaves this relationship unexplained. The converter's nominal resolution or a general high-speed category cannot supply that missing context.
Keep this effect separate from uncertainty about which channel is sampled. The simultaneous-versus-multiplexed decision concerns the converter's channel architecture, while jitter concerns the instant of a capture. A design may need both decisions reviewed, but resolving the sampling arrangement does not state how much timing uncertainty the application can tolerate.
2. Keep analog input frequency in the requirement
ADI explains that a given amount of aperture jitter has an effect dependent on signal frequency. In its discussion of a changing AC input, higher frequency is associated with a steeper signal slope and a larger amplitude consequence from a given timing change. The practical requirement must therefore retain the analog input-frequency context to which the clock question applies.
The sample rate is a different quantity. It describes the converter's sampling context but cannot stand in for the frequency of the analog signal being captured. A requirement containing only a throughput label leaves out the input coordinate used in ADI's jitter explanation. Keep both descriptions understandable rather than calling either one simply the operating frequency.
For an application with several relevant signal conditions, associate the required performance context with the appropriate input condition. This is a way to frame the engineering question, not a calculation of an allowable clock value. It avoids comparing two jitter descriptions as though a single number had the same consequence for every analog input the converter might encounter.
3. Distinguish converter and application jitter sources
The converter's own timing uncertainty is not the entire application contribution. ADI distinguishes sources inside the converter from those arising in the application circuit, including the clock-generation context. A published ADC characteristic therefore has a defined role in the comparison, but it does not describe every timing contribution of the assembled signal chain.
Identify which source a cited jitter statement describes. An ADC aperture-jitter description and a clock-related statement are not interchangeable labels for the complete system. Keeping their origins visible prevents an individual component characteristic from being presented as an achieved converter result. This distinction remains useful even when the application assessment will eventually consider the contributions together.
The physical implementation also belongs to the system context. ADI notes that clock generation and board layout affect the performance achieved. That observation is a reason to preserve the scope of the available evidence; it is not a layout prescription. A manufacturer component description cannot document how the customer's clock path has actually been implemented or evaluated.
4. Keep clock requirements separate from validation
A useful clock requirement links the intended analog input condition, the converter's relevant performance objective and the source of each timing statement. These are technical inputs to the assessment, rather than a shopping description for a generally low-jitter clock. They explain what the selected clock must help the circuit accomplish without claiming that a particular headline establishes the completed result.
Keep the acquisition-settling question separate. The related SAR guide concerns whether the source, driver and filter can settle during the available acquisition interval. Jitter instead concerns variation in the capture time of the changing signal. Adequate evidence for one cannot be carried across as a result for the other merely because both discussions involve ADC timing.
Likewise, a clock-output logic classification identifies an interface rather than an achieved jitter or signal-to-noise result. Retain that interface decision alongside the timing requirement without confusing their purposes. This guide supplies no derived jitter budget, effective-resolution promise or clock-layout instruction; those outcomes require the actual converter, clock path and application conditions to be assessed together.
Sources and further reading
ADI's aperture-jitter explanation and distinction between internal and application sources were reread on 15 October 2026. Equations, numerical jitter budgets, plots, ENOB predictions and board-layout prescriptions are outside this guide's evidence scope.