AD7765 - at which moment converter performs processing. I want to synchronize the system with the DAC.

I want to synchronize ADC and DAC. The DAC is simple. On the other hand I can not find the information, which signal indicates the moment of analog value processing.

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  • 0
    •  Analog Employees 
    on Feb 27, 2017 12:42 AM

    Hi,

    May I know exactly what is your application and why do you need to synchronized DAC with the ADC? AD7765 has a /SYNC pin which allows the user to control the start of conversion/gathering samples from a known point in time. When this pin is low, the modulator and filter are held in a reset state until the pin is pulled high. Following a /SYNC pulse, the digital filter needs time to settle before valid data can be read from AD7765. The user knows there is a valid data on the SDO line by checking the FILTER-SETTLE status bit that is output with each conversion result. The time from the rising edge of /SYNC until the FILTER-SETTLE bit asserts depends on the filter configuration used. (see table 6 for details on calculating time until FILTER-SETTLE bit asserts).

    Thanks,

    Jellenie

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  • 0
    •  Analog Employees 
    on Feb 27, 2017 12:42 AM

    Hi,

    May I know exactly what is your application and why do you need to synchronized DAC with the ADC? AD7765 has a /SYNC pin which allows the user to control the start of conversion/gathering samples from a known point in time. When this pin is low, the modulator and filter are held in a reset state until the pin is pulled high. Following a /SYNC pulse, the digital filter needs time to settle before valid data can be read from AD7765. The user knows there is a valid data on the SDO line by checking the FILTER-SETTLE status bit that is output with each conversion result. The time from the rising edge of /SYNC until the FILTER-SETTLE bit asserts depends on the filter configuration used. (see table 6 for details on calculating time until FILTER-SETTLE bit asserts).

    Thanks,

    Jellenie

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