AD4080BBCZ datasheet(62/95 Pages) AD

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Data Sheet

AD4080

DIGITAL FEATURES

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Rev. 0 | 62 of 95

Event Trigger Capture Mode, Read All FIFO

Event triggered mode can be used where ADC results immediately

prior to the event, as well as those after, are of interest to the user.

Once armed, the FIFO continuously fills with new ADC results,

storing up to, at most, 16,384 of the most recent results, wrapping

around and overwriting the oldest results in FIFO memory once

16,384 captures are made.

Once a trigger event occurs, the FIFO continues to capture WA-

TERMARK number of results after the event. Only multiples of four

are valid values to set the FIFO_WATERMARK register when using

this mode. After an even has occurred, and the WATERMARK

number of results have been captured in the FIFO, no further

new results are captured until the FIFO is rearmed. Once the

FIFO has stopped capturing, the FIFO_WATERMARK register is

automatically loaded with a value that represents the location in

the FIFO where the event occurred, as shown in Figure 91 and

Figure 92. The user must read back all 16384 FIFO results and

the value read back from FIFO_WATERMARK allows the user to

determine where in the FIFO result data that the even occurred and

also to distinguish between results that occurred before the event

and those which occurred after the event as shown in the Figure 92

diagram.

Figure 91. Event Capture Mode Read All FIFO Mode Example, FIFO Filling

Figure 92. FIFO Event Capture Mode Read All FIFO Mode Example, Locating

Event Position in FIFO

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