EVAL-AD7625FMCZ: External trigger and storage

Question

Accepted Answer

Question I'm using the EVAL-AD7625FMCZ- System and have the following questions:
 -Is it possible to store more than 1048576 measurements, because the memory 
 is 32MB on the board ? Quadrature modulation carrier frequency =300kHz, signal 
 frequenz =5Hz à 200ms, sampled with 5 MSPS and 1048576 measurements means 
 209ms storage memory depth.
 With 32MB I can store nearly 16 millions measurements.
 
 -Is it possible to use an extern trigger to start the measurement on the 
 board?
 Answer Typically the capture limit is set by the processor on the controller board. 
 The processor has a capture for its histogramming feature of 2^20 16-bit 
 samples. This is obviously not a limitation of the AD7625, but of using it in 
 the default evaluation environment.
 The same holds true for starting conversions. If the evaluation software is to 
 be used to run the evaluation board, then the start button in the software must 
 be used to trigger conversions. The customer could always develop their own 
 system to trigger conversions relative to some event, but this is not a feature 
 of our evaluation software.

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AD7625: FAQ

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