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ADXL372 external synchronization

Hello

Our customer will use ADXL372 at external sync (2000Hz) and internal clock (ODR=3200 Hz setting).

Datasheet rev.0 P24  "SYNCHRONIZED DATA SAMPLING" says below.

"

The EXT_SYNC is an active high signal. Due to the asynchronous
nature of the internal clock and external sync, there may be a
one ODR clock cycle difference between consecutive external sync
pulses. "

Question

What does one ODR clock cycle difference  mean ?

I think  that  ADXL372  outputs date at 1/3200 second after sync (every 1/2000 second )

when SYNC is 2000Hz and ODR setting is3200Hz (internal clock ).

Please let me know your advice how  "one ODR clock cycle difference" affects ADXL372 operation .

Regards,

Terumasa

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  • Hello - san, 

    Thank you for your post and your use of ADXL372. 

    Based on your explanation your external sync signal looks like this:

    From the datasheet, it is said that "The external sync sets the ODR of the system" . This would mean that the ODR of the system is equal to 2 kHz. The statement that there may be a one ODR clock cycle difference between consecutive external pulses refers to this:

    Regards, 

    JP

Reply
  • Hello - san, 

    Thank you for your post and your use of ADXL372. 

    Based on your explanation your external sync signal looks like this:

    From the datasheet, it is said that "The external sync sets the ODR of the system" . This would mean that the ODR of the system is equal to 2 kHz. The statement that there may be a one ODR clock cycle difference between consecutive external pulses refers to this:

    Regards, 

    JP

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